CN101574032B - Harvester - Google Patents

Abstract

The present invention provides a harvester, whose operating parts not only can select high speed running area on rood or intermediate speed running area suitable for harvest operation but also can select low speed running area for lodging stalk harvest operation, having small possibility of incorrect manipulation and small located space. In the harvester, the hydraulic pump (41) and the hydraulic motor (42) of the hydrostatic type continuously variable unit (4) are all in variable capacity type. A high speed running area suitable for road running, a intermediate speed running area suitable forupending stalk harvest operation in field and a low speed running area suitable for lodging stalk harvest operation whose speed is lower than the running speed in the intermediate speed running area are set up in the speed controlling area of the hydraulic motor (42), respectively can freely operate a first operating part (23) capable of selectively switching the high speed running area and the intermediate speed running area, and a second operating part (24) capable of selectively switching the intermediate speed running area and the low speed running area.

Description

Harvester

Technical field

The present invention relates to harvesters such as combine.

Background technology

(1) as the combine that possesses hydrostatic formula stepless speed change device, the known in the past device that possesses following structure.

Promptly, the hydraulic pump and the hydraulic motor of hydrostatic formula stepless speed change device are constituted variable capacity type respectively, operation by main shift lever is carried out variable speed operation to hydraulic pump, operate the press button of the usefulness of running at high speed respectively, standard the travel press button of usefulness of the press button of usefulness and lodging that travels, control the action of hydraulic motor thus, the output of travelling is carried out speed Control and formed the usefulness that is suitable for running at high speed, the usefulness of driving at moderate speed, the travel speed that runs at a low speed each stage of usefulness is (referring to JP2005-265052A paragraph [0031], [0035] and Fig. 2, Fig. 3, Fig. 4, Fig. 9).

(2) in addition, in combine as an example of harvester, possess hydrostatic formula stepless speed change device (10 among Fig. 2 of JP2005-265052A and Fig. 4) as the purposes of travelling, the hydraulic pump (13 among Fig. 2 of JP2005-265052A and Fig. 4) of hydrostatic formula stepless speed change device is constituted to march forward side and retreat the free infinitely variable speeds of side.

In patent documentation 1, the hydraulic motor (14 among Fig. 2 of JP2005-265052A and Fig. 4) (suitable with the speed change gear of the usefulness of travelling) of hydrostatic formula stepless speed change device is constituted and can become high speed position, middling speed position and low-speed position by free operant, can operate (referring to 33,34,35 among Fig. 3 of JP2005-265052A and Fig. 4) to the hydraulic motor of hydrostatic formula stepless speed change device independently with the hydraulic pump of hydrostatic formula stepless speed change device.

At this moment, in the hydraulic motor of hydrostatic formula stepless speed change device, use high speed position as the mobile purposes of travelling on the road or under the condition such as ridge, harvesting operation purposes as the field is used the middling speed position, when arriving the violent part of plant lodging in the harvesting operation in the field, the hydraulic motor of hydrostatic formula stepless speed change device is operable to low-speed position.

In the occasion of gathering in the violent crop of lodging like this, be set at low speed by travel speed with body, the responsiveness of the relative reaping part of travel speed that can prevent body is too fast and make the harvesting of reaping part not catch up with the such situation of rhythm, reaping part can be not slow, can gather in the crop of lodging.

(3) in addition, in the combine as an example of harvester, what have possesses the disclosed such driving transmission agent of JP2004-187506A and gathers in transmission system.

At this, the transmission of power of engine (8 among Fig. 2 of JP2004-187506A) is to hydrostatic formula stepless speed change device (7 among Fig. 2 of JP2004-187506A), and the power of the output shaft of hydrostatic formula stepless speed change device (7b among Fig. 2 of JP2004-187506A) is branched off into driving transmission agent and harvesting transmission system side by side.The power of driving transmission agent is passed to mobile devices (1 among Fig. 1 of JP2004-187506A and Fig. 2) via secondary speed-changing device (10 among Fig. 2 of JP2004-187506A), and the power of harvesting transmission system is passed to reaping part (2 among Fig. 1 of JP2004-187506A and Fig. 2) via harvesting speed change gear (15 among Fig. 2 of JP2004-187506A).

In harvester, the travel speed of the preferred in general body state synchronous (responsiveness of reaping part also became the state of high speed when the travel speed that the responsiveness of reaping part is also worked as body for low speed when the travel speed of body is low speed was high speed) with the responsiveness of reaping part.Therefore, be fixed on set shift position if in JP2004-187506A, will gather in speed change gear, then by the hydrostatic formula stepless speed change device of operation, form the synchronous state of the responsiveness of the travel speed of body and reaping part (secondary speed-changing device generally as on the road or the mobile purposes of travelling under the condition such as ridge possess high speed position, harvesting operation purposes as the field possesses low-speed position, secondary speed-changing device is not operable to high speed position in the harvesting operation, secondary speed-changing device is fixed on low-speed position).

Summary of the invention

(1) corresponding with background technology (1) problem is as follows.

Such shown in JP2005-265052A, operation variable speed operation hydraulic pump by main shift lever, carry out the change of the operating speed of hydraulic motor realization by a plurality of press buttones, in such structure, aspect following, be favourable: can be suitable for travelling, can be used expediently under the speed of purpose operation by the simple operations that operation of push-button switch is realized.

Yet, in the structure that this patent document 1 is put down in writing, because press button by the press button of selecting the above-mentioned usefulness of running at high speed of operation respectively, the usefulness of driving at moderate speed and the press button that runs at a low speed usefulness obtain purpose operation travel speed, so there are the following problems.

Promptly, its quantity of button of using as operating parts easy more more at most will with the approaching speed of the velocity band that is suitable for the purpose operation as alternative, but in opposite one side, when selecting object to become for a long time, existing is easy to generate the possibility of pushing maloperations such as mistake.

For fear of such maloperation, considered to strengthen terrifically the countermeasure of setting at interval of press button etc., but this is not a completely safe plan, exists setting of press button in the manoeuvre portion that various operating parts mix to become with the space in addition and greatly causes the problem of space waste.

The object of the present invention is to provide a kind of combine, promptly, when possessing operating parts, the possibility of maloperation is little, and operating parts to set the space little, as operating speed, erect the zone of driving at moderate speed of cane harvesting operation in the zone or be suitable for of running at high speed of travelling on being suitable for the road, this operating parts can also select to be suitable for to lodge zone that runs at a low speed of cane harvesting operation.

(2) corresponding with background technology (2) problem is as follows.

In harvester, as JP11-032557A (referring to Fig. 2 and Figure 22) is disclosed, also there is the machine possess the speed change gear that reaping part uses.Thus, considered the travel speed of body to be set at the situation of the speed change gear that the harvester combination reaping part of low speed uses with respect to occasion the fierce crop of harvesting lodging.

The objective of the invention is to, in harvester, when the speed change gear of the usefulness of will travelling constitutes the low-speed position that the lodging harvesting operation that can be operable to the violent crop of the high speed position that moves the usefulness of travelling, middling speed position that the harvesting operation is used and harvesting lodging freely uses, suitably get in touch the speed change gear that reaping part is used.

(3) corresponding with background technology (3) problem is as follows.

In harvester, the hydraulic pump of hydrostatic formula stepless speed change device constituted to march forward side and retreat the free infinitely variable speeds of side, by operating the hydraulic pump of hydrostatic formula stepless speed change device, carry out the operation of advancing and retreating of body, thereby carry out the operation of the travel speed of body, the situation of Gou Chenging is more like this.Thus, when arriving the violent part of plant lodging in the harvesting operation in the field, the hydraulic pump of hydrostatic formula stepless speed change device is operated low speed side, the travel speed of body is operating as low speed.

Yet, when the hydraulic pump of hydrostatic formula stepless speed change device is operating as low speed side the discharge rate of the hydraulic pump of hydrostatic formula stepless speed change device is diminished, so when the travel speed of body became low speed, driving force (moment) also diminished simultaneously.Like this, think in the big soft field of running resistance, when the hydraulic pump with hydrostatic formula stepless speed change device is operating as low speed side, can form the not enough state of driving force (moment).

The objective of the invention is to, when in harvester, possessing hydrostatic formula stepless speed change device, while the decline that can avoid driving force (moment) is made as low speed with the travel speed of body.

(1) be used to the to deal with problems scheme of (1) is as follows.

That is, be used for the power from engine input is carried out speed change and outputs to the combine of the hydrostatic formula stepless speed change device of mobile devices side possessing, it is characterized in that,

The hydraulic pump and the hydraulic motor that constitute described hydrostatic formula stepless speed change device are all constituted variable capacity type;

Carry out the forward-reverse of body with stepless gearing method by the variable speed operation of described hydraulic pump; And,

In the speed control area of described hydraulic motor, set the zone of running at high speed be suitable for travelling on the road, the zone of driving at moderate speed that is suitable for the setting cane harvesting operation in the field, speed and the run at a low speed zone of be suitable for lodge cane harvesting operation lower than the travel speed in the described zone of driving at moderate speed;

Possess first operating parts of selecting described the run at high speed zone and the zone of driving at moderate speed of a ground handover operation, select the described zone and run at a low speed second operating parts in zone of driving at moderate speed of a ground handover operation, but first operating parts and second operating parts free operant respectively.

According to above-mentioned formation, owing to constitute the forward-reverse that carries out body by the variable speed operation of hydraulic pump with stepless gearing method, and, in the speed control area of hydraulic motor, the zone of running at high speed that setting is suitable for travelling on the road, the zone of driving at moderate speed that is suitable for the setting cane harvesting operation in the field, speed are than the lodge zone that runs at a low speed of cane harvesting operation of low being suitable for of travel speed in the described zone of driving at moderate speed, so, can select to be adapted to drive to the lodging cane and gather in the operating speed of the large-scale velocity variations of operation from the road.

And, especially in the present invention, since possess select a ground handover operation described run at high speed the zone and drive at moderate speed the zone first operating parts, select a ground handover operation described drive at moderate speed the zone and run at a low speed the zone second operating parts, but first operating parts and second operating parts be free operant respectively, so, by selecting described first operating parts of a ground handover operation or selecting a ground and operate any operation of second operating parts in the two, can in the operation form of combine, carry out variable speed operation towards desired operating speed.

Promptly, in combine, during travelling in the zone of running at high speed of on being suitable for the road, travelling, the necessity that runs at a low speed the zone from the unexpected variable speed operation of this transport condition to the cane harvesting operation that is suitable for lodging is little, usually, by in the zone and run at high speed and select one variable speed operation between the zone of driving at moderate speed of the setting cane harvesting operation that is suitable for the field, the form of can expecting to travel selects to switch to the harvesting operation of common setting cane and the variable speed operation that travels under the non-harvesting state.

In addition, the cane harvesting operation that is suitable for lodging run at a low speed travelling in the zone time, necessity from the unexpected variable speed operation of this transport condition to the zone of running at high speed that is suitable for travelling on the road is little, usually, by in the zone and run at a low speed and select one variable speed operation between the zone of driving at moderate speed of the setting cane harvesting operation that is suitable for the field, the form of can expecting to travel selects to switch to the variable speed operation that runs at a low speed of common setting cane harvesting operation and harvesting lodging state cane.

And, the occasion of travelling in the zone of driving at moderate speed of the setting cane harvesting operation that is suitable for the field, exist variable speed operation also to the above-mentioned regional possibility of carrying out of running at high speed with any running region that runs at a low speed the zone, at this moment, speed change frequency between judgement and the non-harvesting operation is big, or and the speed change frequency that runs at a low speed between the zone of cane lodging state is big, can select and should be operated by first operating parts, still should be operated by second operating parts.

Its result, in the present invention, as the operating parts of selecting operating speed, by using the first above-mentioned operating parts or any operating parts of second operating parts, the zone that runs at a low speed that the cane of can also selecting to be suitable for to lodge in the zone of driving at moderate speed of cane harvesting operation gathers in operation is erect in the zone or be suitable for of running at high speed of travelling on being suitable for the road.

Therefore owing to can select an operation and select desired operating speed by what the first above-mentioned operating parts or second operating parts carried out, so, with select a plurality of operating parts in the operation of arbitrary operating parts compare, have the dangerous little advantage that causes maloperation.

And, owing to need not a plurality of operating parts, and cause the possibility of maloperation little, so, need not the big space of occupying as the space that is used to set operating parts, have the advantage that can constitute cramped construction as a whole.

In one embodiment, it is characterized in that possessing operating mechanism, be operable to when running at a low speed the zone that this operating mechanism becomes the harvesting speed change gear speed change in the drive system of reaping part at a high speed thereupon when second operating parts is switched.

According to above-mentioned formation, be switched at second operating parts and be operable under the state that runs at a low speed the zone, need be suitable for gathering in the driving form of the harvesting operation under the state that the object cane significantly lodges.Under such operating condition, the body travel speed is fully reduced, and need to increase to draw to hold up operational ton, not extract the significantly cane of lodging.

Thereby, the body travel speed is significantly reduced, make it possible to the above-mentioned second operating parts handover operation be become to run at a low speed the zone and implement the lodging harvesting, gather in the speed change gear variable speed operation thereupon and become at a high speed, the lodging cane draw the quantitative change of advancing of the relative body of the amount of holding up big.Its result has the advantage of the harvesting operation that can well lodge.

In a preferred implementation, it is characterized in that first operating parts is arranged on the handle of variable speed operation bar that hydraulic pump to hydrostatic formula stepless speed change device carries out variable speed operation; Second operating parts is arranged on the control panel.

According to above-mentioned formation, be arranged on the handle of variable speed operation bar with first operating parts that is suitable for the zone of driving at moderate speed of setting cane harvesting operation in the field owing to selecting to switch the zone of running at high speed that is suitable for travelling on the road, select switching the lodge second regional operating parts that runs at a low speed of cane harvesting operation of being suitable for that is suitable for above-mentioned drive at moderate speed zone and low speed is arranged on the control panel, so, the possibility of faulty operation first operating parts and second operating parts just becomes littler, has the advantage that can improve the possibility that maloperation avoids more.

And, be arranged on the handle of variable speed operation bar with first operating parts that is suitable for the zone of driving at moderate speed of setting cane harvesting operation in the field owing to selecting to switch the zone of running at high speed that is suitable for travelling on the road, so, can promptly carry out handover operation while controlling the variable speed operation bar, also have advantage aspect the operating efficiency raising.

In addition, select to switch the zone and be arranged on the control panel of driving at moderate speed that is suitable for erectting in the field cane harvesting operation than the lodge second regional operating parts that runs at a low speed of cane harvesting operation of this low being suitable for of travel speed of driving at moderate speed the zone, but because the operation frequency of the handover operation of this second operating parts is so not high, and, this handover operation also is to carry out under the state that runs at a low speed in the body of harvesting in the operation travels, so, even eyes the place ahead away from keyboard cane group and visual control panel bring obstacle also can not for the harvesting operation, can proceed operation.

In addition because second operating parts is arranged on the control panel, at ordinary times visual easily to the position on show the switching state of second operating parts, so, returning after preventing handover operation forget aspect also be easily.

In a preferred implementation, it is characterized in that, hydrostatic formula stepless speed change device possesses the single action pressure cylinder and resets uses spring, the change operation at the swash plate angle of carrying out as relative hydraulic motor, the operating physical force of the pressure oil of described single action pressure cylinder by supplying to compression chamber with swash plate to the operation of fascinating of high speed outlet side, described resetting pressed the supply of oil and shunk along with described with spring, follow the discharge of pressing oil with the single action pressure cylinder to the low speed outlet side application of force that resets;

In the pressure feed oil circuit in the compression chamber of described single action pressure cylinder, proportional pressure-reducing valve is set, to reset that the high speed outgoing position that is compressed to shrinkage limit with spring and the pressure oil in the described compression chamber are discharged from and described resetting at described single action pressure cylinder, and supply with the pressure oil of the described reset response dynamic balance located with the centre position of the flexible scope of spring of resetting and set the middling speed outgoing position with the middle part of the low speed outgoing position of spring elongation;

The high speed outgoing position of hydraulic motor is the zone of running at high speed that is suitable for travelling on the road, the middling speed outgoing position is the zone of driving at moderate speed that is suitable in the field erectting cane harvesting operation, and the low speed outgoing position is set speed and the run at a low speed zone of be suitable for lodge cane harvesting operation lower than the travel speed in the described zone of driving at moderate speed for.

According to above-mentioned formation, as by hydraulic motor setting high-speed running region, drive at moderate speed the zone and run at a low speed the zone mechanism, adopted the single action pressure cylinder at the swash plate angle that changes the operation hydraulic motor and along with pressing oil to shrink and the single action pressure cylinder being used spring to low speed outlet side the resetting of the application of force that reset along with the discharge of pressing oil to the supply of compression chamber, supply pressure by giving this single action pressure cylinder and the setting that resets with the active force of spring get, so, but have the advantage that implementation structure is simplified.

That is to say, with the position of the hydraulic piston of swash plate angle control usefulness by detecting hydraulic motor, control the such structure of swash plate angle by a plurality of proportional control valve control pistons position and compare, need not special-purpose position detecting mechanism, and reduced the usage quantity of proportional control valve, have the advantage that can constitute simple structure.

(2) be used to the to deal with problems scheme of (2) is as follows.

That is, possess the speed change gear of the usefulness of travelling, the speed change gear that reaping part is used, the manual operation part of manually operating.The speed change gear of the usefulness of travelling is constituted the low-speed position that the lodging harvesting operation of the crop that can be operable to the high speed position that moves the usefulness of travelling, middling speed position that the harvesting operation is used and harvesting serious lodging is freely used.

Travel speed change gear that the speed change gear of usefulness is manipulated into the mobile transport condition of high speed position, the usefulness of travelling of setting is manipulated into speed change gear that speed change gear that middling speed position and reaping part use is manipulated into the standard harvesting state of low-speed position, the usefulness of travelling and is manipulated into the low speed harvesting state that speed change gear that low-speed position and reaping part use is manipulated into high speed position.

Contact manual operation part, the speed change gear of the usefulness of travelling and the speed change gear that reaping part is used are so that can set mobile transport condition, standard harvesting state, low speed harvesting state by the manual operation part.

According to above-mentioned formation, in the harvesting operation in the field, if words by manual operation part established standards harvesting state, the speed change gear of the usefulness of travelling is operable to the middling speed position, the speed change gear that reaping part is used is operable to low-speed position, and the travel speed of body is set at suitable value (responsiveness of reaping part is set at suitable value with the travel speed of body relatively) with the responsiveness of reaping part relatively.

At this moment, by manual operation part established standards harvesting state, the speed change gear of the usefulness of travelling is manipulated into the middling speed position, the speed change gear that reaping part is used is manipulated into low-speed position, so the speed change gear that the speed change gear of the usefulness that need not to travel is respectively used to the manual operation and the reaping part of middling speed position is to the manual operation of low-speed position.

In addition, arrive the occasion of the violent part of plant lodging in the harvesting operation of field, if set low speed harvesting state by the manual operation part, the speed change gear of the usefulness of travelling is manipulated into low-speed position, and the speed change gear that reaping part is used is manipulated into high speed position.

At this moment, be operating as low-speed position by travelling with speed change gear, the situation that the responsiveness of the relative reaping part of travel speed of inhibition body accelerates, be operating as high speed position by the speed change gear that reaping part is used, the slack-off situation of travel speed that suppresses the relative body of responsiveness of reaping part is set at suitable value (responsiveness of the relative reaping part of travel speed of body is set at suitable value) with the travel speed of the relative body of responsiveness of reaping part.

Set low speed harvesting state by the manual operation part, the speed change gear of the usefulness of travelling is manipulated into low-speed position, the speed change gear that reaping part is used is manipulated into high speed position, so the speed change gear that the speed change gear of the usefulness that need not to travel is respectively used to the manual operation and the reaping part of low-speed position is to the manual operation of high speed position.

In addition, on the way or in mobile the travelling of ridge etc., if set mobile transport condition by the manual operation part, the speed change gear of the usefulness of then travelling is manipulated into high speed position, can carry out on the road or the mobile of high speed of ridge etc. travelled.

Therefore, the occasion that in harvester, possesses the speed change gear and the speed change gear that reaping part is used of the usefulness of travelling, can suitably connect the speed change gear of the usefulness of travelling and the speed change gear that reaping part is used on one side each other, set mobile transport condition, standard harvesting state and low speed harvesting state by the manual operation part on one side, by such formation, can be suitably corresponding to moving the lodging harvesting operation of travelling, gathering in operation and the violent crop of harvesting lodging, the operation that can improve harvester.

In addition, need not to travel respectively speed change gear that the speed change gear of usefulness uses to the manual operation and the reaping part of middling speed position to aspect low-speed position manually operated in occasion by manual operation part established standards harvesting state, and need not to travel respectively speed change gear that the speed change gear of usefulness uses to the manual operation and the reaping part of low-speed position to aspect high speed position manually operated in the occasion of setting low speed harvesting state by the manual operation part, can improve the operability of harvester.

In a preferred implementation, possesses the harvesting clutch that relative reaping part transmitted and cut off power freely.Possess operating mechanism, when setting mobile transport condition, this operating mechanism will gather in clutch operating and become dissengaged positions.This formation is more favourable in the following areas.

In harvester, the mobile situation of locating carry out on the road under the state that reaping part is stopped or ridge etc. of travelling is more in general.

If set mobile transport condition by the manual operation part, the harvesting clutch stops reaping part thereupon being manipulated into dissengaged positions, so, need not to gather in addition the manual operation of clutch to dissengaged positions.

Therefore, the occasion set mobile transport condition by the manual operation part need not to gather in addition the manual operation of clutch to dissengaged positions, can improve the operability of harvester.

In a preferred implementation, possesses the mechanism of pining down, this pins down mechanism and stops the situation of just not setting low speed harvesting state via standard harvesting state from mobile transport condition, and the situation of transport condition is not just moved in prevention from low speed harvesting setting state via standard harvesting state.This formation is more favourable in the following areas.

The speed change gear of usefulness is manipulated into high speed position owing to travel under mobile transport condition, the speed change gear of the usefulness of travelling under low speed harvesting state is manipulated into low-speed position, so, under mobile transport condition and low speed harvesting state, on the travel speed of body, have bigger difference.

In this formation, in the occasion that moves transport condition by the manual operation part from low speed harvesting setting state, can't just not move transport condition from low speed harvesting setting state via standard harvesting state, must gather in setting state standard harvesting state from low speed, move transport condition from standard harvesting setting state then.Equally, in the occasion of setting low speed harvesting state by the manual operation part from mobile transport condition, can't just not set low speed harvesting state from mobile transport condition via standard harvesting state, must be from mobile transport condition established standards harvesting state, then from standard harvesting setting state low speed harvesting state.

Like this, in the occasion that moves transport condition by the manual operation part from low speed harvesting setting state, in the occasion of setting low speed harvesting state by the manual operation part from mobile transport condition, come to move the occasion (setting the occasion of low speed harvesting state by the manual operation part from mobile transport condition) of transport condition from low speed harvesting setting state by the standard harvesting state of body travel speed via the centre that possesses mobile transport condition and low speed harvesting state of constituting, can suppress the rapid variation of body travel speed by the manual operation part.

Therefore, in the occasion (setting the occasion of low speed harvesting state by the manual operation part from mobile transport condition) that moves transport condition by the manual operation part from low speed harvesting setting state, the rapid variation of body travel speed can be suppressed, thereby the deterioration of the riding comfort that the rapid variation because of the body travel speed causes can be prevented.

In addition, owing to prevented to produce the operation of the speed change gear of the body travel speed usefulness of travelling jumpy, so, also be favourable aspect the raising of the durability of the speed change gear of the usefulness of travelling.

(3) be used to the to deal with problems scheme of (3) is as follows.

That is, possess the hydrostatic formula stepless speed change device of the power that transmits engine, hydrostatic formula stepless speed change device possesses the hydraulic pump of transmission upstream side and the hydraulic motor in transmission downstream.The hydraulic motor of hydrostatic formula stepless speed change device is constituted free speed change.The power of the hydraulic motor of hydrostatic formula stepless speed change device is branched off into driving transmission agent and harvesting transmission system side by side, gives mobile devices the transmission of power of driving transmission agent.Give reaping part with the transmission of power of harvesting transmission system, in the harvesting transmission system, possess the harvesting speed change gear.This formation is favourable in the following areas.

The hydraulic motor of hydrostatic formula stepless speed change device is operable to low speed side, make the stroke of plunger of hydraulic motor of hydrostatic formula stepless speed change device diminish, so, even from the hydraulic pump of hydrostatic formula stepless speed change device hydraulic motor is fully supplied with action oil, the hydraulic motor of hydrostatic formula stepless speed change device also less rotates.Thus, be operable to the occasion of low speed side at hydraulic motor with hydrostatic formula stepless speed change device, if guarantee the discharge rate of the hydraulic pump of hydrostatic formula stepless speed change device, then the hydraulic motor from hydrostatic formula stepless speed change device transmits the low speed power that possesses sufficient driving force (moment) to the transmission downstream.

According to above-mentioned feature, the power of engine is passed to mobile devices via the hydraulic pump of hydrostatic formula stepless speed change device and hydraulic motor, driving transmission agent, and the hydraulic motor of hydrostatic formula stepless speed change device constitutes free speed change.

Thus, under the state of the discharge rate of the hydraulic pump of having guaranteed hydrostatic formula stepless speed change device, when the hydraulic motor with hydrostatic formula stepless speed change device is operable to low speed side, give mobile devices owing to will possess the low speed transmission of power of sufficient driving force (moment), so, even in the big soft field of running resistance, driving force (moment) also can be sufficient, can obtain the body travel speed of low speed.

In addition, the power of the hydraulic motor of hydrostatic formula stepless speed change device is branched off into driving transmission agent and harvesting transmission system side by side, gives mobile devices with the transmission of power of driving transmission agent, transmission of power that will the harvesting transmission system is given reaping part.

Thus, when operating the hydraulic motor of hydrostatic formula stepless speed change device, the power of crossing by the hydraulic motor speed change of hydrostatic formula stepless speed change device is passed to mobile devices and reaping part side by side, so, identical with JP2004-187506A, can obtain the travel speed of body and the synchronous state of responsiveness of reaping part.

In addition, in the harvesting operation in field,, need fall the travel speed of body enough low when the occasion that arrives the violent part of plant lodging.

Thus, there is such situation, promptly, when the hydraulic motor with hydrostatic formula stepless speed change device be operating as low speed side, when making the travel speed of body form abundant low speed, the responsiveness of reaping part also becomes abundant low speed (responsiveness of reaping part became low), can't carry out the stable harvesting (when the responsiveness that can not guarantee at reaping part more than a certain amount of, can't carry out stable harvesting) of reaping part.

To this, in the present invention, owing in the harvesting transmission system, possess the harvesting speed change gear, so, the hydraulic motor of hydrostatic formula stepless speed change device is operating as low speed side, the travel speed of body is fully formed low speed, at this moment, be operating as high-speed side by gathering in speed change gear, can avoid the situation that the responsiveness of reaping part became low (responsiveness that can guarantee reaping part be a certain amount of more than).

Therefore, the occasion that in harvester, possesses hydrostatic formula stepless speed change device, constitute free speed change by hydraulic motor with hydrostatic formula stepless speed change device, can avoid the decline of driving force (moment) on one side, travel speed row with body becomes low speed on one side, thereby has improved the rideability of harvester.

In addition, in the travel speed of body and the synchronous occasion that constitutes of responsiveness of reaping part, even the travel speed of body fully is set as low speed, also can avoid the situation that the responsiveness of reaping part became low (responsiveness that can guarantee reaping part be a certain amount of more than), can improve the harvesting performance under the state that in the harvesting operation in field, arrives the violent part of plant lodging.

In addition, in another solution, possess the hydrostatic formula stepless speed change device of the power that transmits engine, hydrostatic formula stepless speed change device possesses the hydraulic pump of transmission upstream side and the hydraulic motor in transmission downstream.Transmission downstream at the hydraulic motor of hydrostatic formula stepless speed change device possesses speed change gear.The power of speed change gear is branched off into driving transmission agent and harvesting transmission system side by side, gives mobile devices the transmission of power of driving transmission agent.Give reaping part with the transmission of power of harvesting transmission system, in the harvesting transmission system, possess the harvesting speed change gear.

Transmission downstream at the hydraulic motor of hydrostatic formula stepless speed change device possesses in the formation of speed change gear, make the power operation with the hydraulic motor of hydrostatic formula stepless speed change device become low speed side owing to speed change gear being operable to low speed side, so, in the occasion that speed change gear is operating as low speed side, if guarantee the discharge rate of the hydraulic pump of hydrostatic formula stepless speed change device, then transmit the power of the low speed that possesses sufficient driving force (moment) to the transmission downstream from speed change gear.

According to above-mentioned formation, the power of engine is passed to mobile devices via the hydraulic pump of hydrostatic formula stepless speed change device and hydraulic motor, speed change gear, driving transmission agent, and speed change gear constitutes free speed change.

Thus, under the state of the discharge rate of the hydraulic pump of having guaranteed hydrostatic formula stepless speed change device, when speed change gear is operable to low speed side, give mobile devices owing to will possess the low speed transmission of power of sufficient driving force (moment), so, even in the big soft field of running resistance, driving force (moment) also can be sufficient, can obtain the body travel speed of low speed.

In addition, the power of speed change gear is branched off into driving transmission agent and harvesting transmission system side by side, gives mobile devices with the transmission of power of driving transmission agent, transmission of power that will the harvesting transmission system is given reaping part.

Thus, when the operation speed change gear, the power of crossing by the speed change gear speed change is passed to mobile devices and reaping part side by side, so, identical with patent documentation 1, can obtain the travel speed of body and the synchronous state of responsiveness of reaping part.

In addition, in the harvesting operation in field, arrive the occasion of the violent part of plant lodging, the travel speed of body fully need be reduced to low speed.

Thus, there is such situation, promptly, when speed change gear is operating as low speed side, when making the travel speed of body fully form low speed, the responsiveness of reaping part also becomes abundant low speed (responsiveness of reaping part became low), can't carry out the stable harvesting (when the responsiveness that can not guarantee at reaping part more than a certain amount of, can't carry out stable harvesting) of reaping part.

To this, according to above-mentioned feature of the present invention, owing in the harvesting transmission system, possess the harvesting speed change gear, so, speed change gear is operating as low speed side, the travel speed of body is fully formed low speed, at this moment, be operating as high-speed side by gathering in speed change gear, can avoid the responsiveness of the reaping part situation (responsiveness that can guarantee reaping part be a certain amount of more than) of low speed that too becomes.

Therefore, the occasion that in harvester, possesses hydrostatic formula stepless speed change device, the speed change gear in the transmission downstream of the hydraulic motor by will being configured in hydrostatic formula stepless speed change device constitutes free speed change, can avoid the decline of driving force (moment) on one side, travel speed row with body becomes low speed on one side, thereby has improved the rideability of harvester.

In addition, in the travel speed of body and the synchronous occasion that constitutes of responsiveness of reaping part, even the travel speed of body fully is set as low speed, also can avoid the situation that the responsiveness of reaping part became low (responsiveness that can guarantee reaping part be a certain amount of more than), can improve the harvesting performance under the state that in the harvesting operation in field, arrives the violent part of plant lodging.

Constitute and constitute the advantageous effects brought into play with reference to the accompanying drawings and following explanation and become clear about other features by this feature.

Description of drawings

Fig. 1 is the unitary side view of the combine of first embodiment of the invention.

Fig. 2 is the schematic diagram of the power-transmission system of expression combine.

Fig. 3 is the loop diagram in the hydraulic operation loop of the hydrostatic formula stepless speed change device of expression.

Fig. 4 is the vertical view of the control panel part of expression Drive Section.

Fig. 5 is the block diagram of the control system of the hydrostatic formula stepless speed change device of expression.

Fig. 6 is the block diagram of the control system of the hydrostatic formula stepless speed change device of another form 1 of expression first embodiment.

Fig. 7 is the unitary side view of the combine of second embodiment of the invention.

Fig. 8 is the vertical profile front view of gearbox.

Fig. 9 is the figure of the hydraulic circuit structure of expression hydraulic pressure unit.

Figure 10 is the figure of the relation of expression gear lever, the varying speed switch that travels, harvesting varying speed switch, turning-bar, turning mode switch, hydrostatic formula stepless speed change device, operation motor and hydraulic pressure unit.

Figure 11 is the figure of the hydraulic circuit structure of the hydrostatic formula stepless speed change device of expression.

Figure 12 is the figure of the mobile transport condition of expression, standard harvesting state and low speed harvesting state.

Figure 13 is the vertical profile end view of the operating structure of expression harvesting speed change gear and harvesting speed change gear.

Figure 14 is the vertical view of the operating structure of expression harvesting speed change gear.

Figure 15 is the unitary side view of the combine of third embodiment of the invention.

Figure 16 is the vertical profile front view of gearbox.

Figure 17 is the figure of the hydraulic circuit structure of expression hydraulic pressure unit.

Figure 18 is the figure of the relation of expression gear lever, turning-bar, turning mode switch, hydraulic pressure unit, operating pressure cylinder and pressure-control valve.

Figure 19 is the figure of the hydraulic circuit structure of the hydrostatic formula stepless speed change device of expression.

Figure 20 is the figure of the mobile transport condition in another form 2 of expression the 3rd embodiment, standard harvesting state and low speed harvesting state.

Figure 21 is the figure of the relation of the pressure of the grease chamber of the position of swash plate of the hydraulic motor of the hydrostatic formula stepless speed change device in another form 3 of expression the 3rd embodiment and operating pressure cylinder.

Figure 22 is the hydrostatic formula stepless speed change device in another form 4 of expression the 3rd embodiment and near the vertical profile front view of speed change gear.

Figure 23 is the unitary side view of the combine of four embodiment of the invention.

Figure 24 is the vertical view of Drive Section.

Figure 25 is the figure of the contact status of expression action bars, direction switch, setting dial plate and hydraulic pressure cylinder.

Figure 26 is illustrated in to set the figure of flow process that dial plate is operable to the operation of action bars under the state that closes the position and direction switch.

Figure 27 will set the figure of flow process of the operation of action bars under the state that dial plate is operable to first to the 6th decline limit and direction switch for expression.

Figure 28 is illustrated in to set the figure that dial plate is operable to the jacking condition of action bars under the state that closes the position and the formed reaping part of direction switch.

Figure 29 will set the figure of the jacking condition of action bars under the state that dial plate is operable to first to the 6th decline limit and the formed reaping part of direction switch for expression.

Figure 30 is the vertical view of action bars of another form 1 of the 4th embodiment.

Embodiment

Based on accompanying drawing the embodiments of the present invention are illustrated below.

In the following description, short of difference is expressed, the direction of the body that travels of combine being advanced and retreating is as fore-and-aft direction, will with the horizontal direction of this fore-and-aft direction quadrature as left and right directions, direction that will be vertical with fore-and-aft direction and left and right directions is as above-below direction.

[first embodiment]

At first first embodiment is described referring to figs. 1 through Fig. 6.

(integral body of combine constitutes)

Figure 1 illustrates the whole side of combine (more specifically being head feed type combine (culm head charging type combine-harvester)).This combine is equipped with pair of right and left crawler type running device 11 in the bottom of organism frame 10, possesses reaping part 3 in the front portion of the organism frame 10 of the body voluntarily 1 that possesses Drive Section 2 grades that have the type of taking of handling seat 20.

With respect to above-mentioned organism frame 10, at its left back lift-launch sheller unit 12, carry grain storage device 13 at right back of organism frame 10, and then possess engine 14, be equipped with above-mentioned Drive Section 2 at the upper side of this engine 14 in the right front portion of organism frame 10.

The base portion that above-mentioned reaping part 3 will support the pre-treatment portion framework 30 of reaping part 3 integral body is attached on the supporting frame (outside the figure) that erects setting from above-mentioned organism frame 10 freely around the horizontal axle core X rotation of body, swings up and down equipment freely via the lifting pressure cylinder 15 that is arranged between reaping part 3 and the organism frame 10.That is to say, when above-mentioned lifting pressure cylinder 15 swings up and down operation pre-treatment portion framework 30 with respect to organism frame 10, with reaping part 3 descending operations become near decline job state in the side of resting on the ground, bottom of pull-up device 31 and pull-up device 31 from ground the non-job state of high rising of floating.

The grain of this combine results rice, wheat etc., when being formed the decline job state, reaping part 3 makes when body travels voluntarily, reaping part 3 is handled upright paddy bar by 31 pull-ups of pull-up device on one side, supply with and gather in processing to the reaping apparatus 32 of hairclipper type on one side, will gather in the paddy bar supplies to top portion from the threshing feeding chain 12a of sheller unit 12 to the conveying of body rear by conveying plant 33.Sheller unit 12 is carried by the strain root side direction body rear side that threshing feeding chain 12a will gather in the paddy bar on one side, on one side its fringe is distolateral to process chamber (not shown) supply and carry out the threshing processing.Grain storage device 13 is retrieved from the threshing particle of threshing device 12 and is stored.

(power-transmission system)

The driving force of above-mentioned engine 14 as shown in Figure 2, the threshing drive system that branch passes to the drive system of travelling that mobile devices 11,11 to the left and right transmit, transmit to sheller unit 12, the harvesting drive system of transmitting to reaping part 3.

That is, in the threshing drive system, by possessing the tape handler 16 of threshing clutch 16a, will also pass to sheller unit 12 and not shown threshing storage device 13 or threshing feeding chain 12a from the power of the output shaft 14a of engine 14.

The above-mentioned drive system of travelling passes to the power shaft 40 of the hydrostatic formula stepless speed change device of putting as the main transformer quick-mounting 4 via driving-belt 9 with the driving force of the output shaft 14a of engine 14, and the driving force of the output shaft 44 of this hydrostatic formula stepless speed change device 4 is passed to gearbox 5.And, inside at gearbox 5, transmit above-mentioned driving force via a pair of to the left and right steering cluth 51 decelerations of gear type reducing gear (not shown), the rotation output of the steering cluth 51 in left side is passed to the drive sprocket 11a of the mobile devices 11 in left side from the horizontal left side output of gearbox 5, the rotation output of the clutch 51 that travels on right side is passed to the drive sprocket 11a of the mobile devices 11 on right side from the horizontal right side output of gearbox 5.

The operation that above-mentioned harvesting drive system passes to the driving force of the above-mentioned output shaft 12 of above-mentioned hydrostatic formula stepless speed change device 4 gearbox 5 passes to the driving force of output shaft 52 this operation the power shaft 35 of reaping part 3 with output shaft 52 via cropping system tape handler 34.

Above-mentioned cropping system tape handler 34 possesses: be located at above-mentioned operation with the output pulley 52a of output shaft 52, be hung on driving-belt 34b between the input belt wheel 35a of output pulley 52a and the power shaft 35 of being located at above-mentioned reaping part 3, be used for becoming tensioning state and relaxed state to insert this driving-belt 34b handover operation and the tension force clutch 34a of opening operation drive state.

In addition, above-mentioned operation possesses harvesting speed change gear 53 with output shaft 52, this harvesting speed change gear 53 is selected change gear (not shown) to switch to be engaged in and is provided in gearbox 5 interior known high speeds gear (not shown) and low speed gear (not shown), carry out the variable speed operation of height two-stage, by the variable speed operation of this harvesting speed change gear 53, actuating speed can be switched speed change and be the height two-stage.

(hydrostatic formula stepless speed change device relation)

Constituting the hydrostatic formula stepless speed change device 4 that above-mentioned main transformer quick-mounting puts possesses: the hydraulic pump 41 of axial columns stopper and variable capacity shape, the axial columns stopper that drives by the pressure oil from this hydraulic pump 41 and the hydraulic motor 42 of variable capacity shape.In addition, possess the reinforced oily charge pump 43 of the closed hydraulic circuit supply that is communicated with this hydraulic pump 41 and hydraulic motor 42.

The operation of above-mentioned hydraulic pump 41 and Fig. 4 and main shift lever (example of variable speed operation bar) 22 shown in Figure 5 changes the swash plate angle linkedly, be arranged to the state in its both sides separate configuration forward operation zone F and back operation region R across neutral position N, by the operation of the push-and-pull on the fore-and-aft direction of main shift lever 22, free variable speed operation becomes the stepless high-low speed change of advance side and retreats the stepless high-low speed change of side, neutral stop position.

Above-mentioned hydraulic motor 42 constitutes the hydraulic motor of the variable capacity shape with above-mentioned hydraulic pump 41 capacity capacity more than a times.Thus, hydraulic motor 42 is provided with to be expert under the involutory state of connecting with hydraulic pump 41 and sails with in the transmission system, has function as secondary speed-changing device, the change operation at the swash plate angle by carrying out this hydraulic motor 42, the drive system of the mobile devices 11,11 to except the main transformer speed of being undertaken, also carrying out secondary speed change about passing to by hydraulic pump 41 from the driving force of engine 14.

As shown in Figure 3, above-mentioned hydraulic motor 42 carries out the change operation of this bevel board by single action pressure cylinder 45.This single action pressure cylinder 45 possesses the compression chamber 45a that is supplied to pressure oil in a side of action piston 46, and the outside open chamber 45b that resets with spring 46a is housed in the opposite side of above-mentioned action piston 46 possesses.

On above-mentioned compression chamber 45a, be connected with the Pressure oil feeder road r that starts from above-mentioned charge pump 43, be provided with the proportional pressure-reducing valve 47 of control on the Pressure oil feeder road r of this charge pump 43 starting from from the Pressure oil feeder pressure of above-mentioned charge pump 43.

Aforementioned proportion pressure-reducing valve 47 will be from the supply pressure of above-mentioned charge pump 43 as primary side pressure, and to above-mentioned single action pressure cylinder 45, this secondary side pressure is set as follows with the secondary side pressure feed.

As shown in Figure 3, proportional pressure-reducing valve 47 self constitutes, not to primary side pressure decompression ground with whole pressure feeds to the fully open position a of secondary side with reduce pressure and supply between the decompression position b of secondary side and carry out switching controls.

And, the pressure of the secondary side that this proportional pressure-reducing valve 47 obtains can setting changing be normal pressure, maximum pressure and minimum pressure, wherein, normal pressure is set at the pressure that resetting of place, the flexible scope centre position of tilt torque that will be turned back to the neutral position by above-mentioned hydraulic motor 2 and single action pressure cylinder 45 is carried out the degree of balance with the formed reset force of summation of the reset response power of spring 46a, maximum pressure surpasses above-mentioned resetting with the reset response power of spring 46a action piston 45 push operation of single action pressure cylinder 45 end of travel to contraction side, and minimum pressure extends the end of travel that be operated to elongate sides with the reset response power of spring 46a with the action piston 46 of single action pressure cylinder 45 less than above-mentioned resetting.

(change control system)

The change control system that is used to control the action of the hydraulic pump 41 of above-mentioned hydrostatic formula stepless speed change device and hydraulic motor 42 is constructed as follows.

As shown in Figure 4, be provided with main shift lever 22, it constitutes the guiding groove 21A guiding on the control panel 21 of cross side quadrate part position of the manipulation seat 20 that is formed on Drive Section 2 and carries out swinging operation to the body fore-and-aft direction.In addition, on this main shift lever 22, on the position, top of its handle 22a, be provided with first press button (example of first operating parts) 23 of finger manipulation formula, on the control panel 21 of the horizontal side at the position that is provided with above-mentioned main shift lever 22, be provided with second press button (example of second operating parts) 24.

As Fig. 4 and as shown in Figure 5, main shift lever 22 can be at neutral position N, the separate configuration infinitely variable speed operation that advances between regional F and the back off area R before and after it, the operating position that the wobbling action of this main shift lever 22 obtains is passed to hydrostatic formula stepless speed change device 4 via not shown mechanically contact mechanism, and speed change is carried out at the swash plate angle that changes the hydraulic pump 41 of the hydrostatic formula stepless speed change device 4 of operation.

First press button 23 that is located at the finger manipulation formula on the handle 22a of above-mentioned main shift lever 22 becomes switch and opens state by being pressed into operation respectively with second press button 24 that is located on the above-mentioned control panel 21, the operation that is pressed into by once more becomes the switch off status, so selects one and switches operation.

The operation signal of these first, second press buttones 23,24 is imported into the speed-change control device 25 that is made of microcomputer, in these speed-change control device 25 sides, to the solenoid 47a output function signal of proportional pressure-reducing valve 47 of the action of control hydraulic motor 42, the action of single action pressure cylinder 45 is controlled variable speed operation hydraulic motor 42.

Promptly, first press button 23 that is located at the finger manipulation formula on the handle 22a of above-mentioned main shift lever 22 is configured for the high-speed driving state of handover operation hydraulic motor 42 and first operating parts of middling speed driving condition, when this first press button 23 during by ON operation, speed-change control device 25 is operated to fully open position a with proportional pressure-reducing valve 47, supply with the normal pressure of charge pump 43 sides, resistance resets and with spring 46a ground single action pressure cylinder 45 is operated to contraction state, and hydraulic motor 42 is operable to fast state.

When being pressed into above-mentioned first press button 23 of operation once more when switching to off status, speed-change control device 25 in the mode that proportional pressure-reducing valve 47 is operated to decompression position b to the solenoid 47a of proportional pressure-reducing valve 47 output function signal, set the secondary pressure of decompression, make resetting of single action pressure cylinder 45 sides average out in the centre position of single action pressure cylinder 45 to the reset summation of tilt torque of side of neutrality with the reset response power of spring 46a and hydraulic motor 42 self.

That is to say that this first press button 23 is configured for that the speed of hydraulic motor 42 is selected one and switches first operating parts that is operating as run at high speed zone and the zone of driving at moderate speed that is suitable for field setting cane harvesting operation that are suitable for travelling on the road.

Second press button 24 that is located on the above-mentioned control panel 21 is configured for the middling speed driving condition of handover operation hydraulic motor 42 and second operating parts of driven at low speed state, when this second press button 24 during by ON operation, speed-change control device 25 is operable to full-gear with proportional pressure-reducing valve 47 at decompression position b, will stop or being restricted to minute quantity from the Pressure oil feeder of charge pump 43 sides.Under this state, single action pressure cylinder 45 is manipulated into elongation state under the effect that resets with the active force of spring 46a and the tilt torque of the side that resets to neutrality, hydraulic motor 42 is operable to lower-speed state.

When switching to off status when being pressed into above-mentioned second press button 24 of operation once more, speed-change control device 25 in the mode of the decompression position b that proportional pressure-reducing valve 47 is operated to regulation to the solenoid 47a of proportional pressure-reducing valve 47 output function signal, set the secondary pressure of decompression, make resetting of single action pressure cylinder 45 sides average out in the centre position of single action pressure cylinder 45 to the reset summation of tilt torque of side of neutrality with the reset response power of spring 46a and hydraulic motor 42 self.

That is to say that this second press button 24 is configured for that the speed of hydraulic motor 42 is selected one and switches to be operating as and be suitable for the field and erect lodge second operating parts that runs at a low speed the zone of cane harvesting operation of the zone and being suitable for of driving at moderate speed of cane harvesting operation.

And, in above-mentioned speed-change control device 25, only when above-mentioned first press button 23 and second press button, 24 both sides all are operable to hydraulic motor 42 state in the above-mentioned zone of driving at moderate speed, the solenoid 47a output function signal of Comparative Examples pressure-reducing valve 47, with carry out by first press button 23 and 24 realizations of second press button to the handover operation of high-speed region side or to the handover operation of low-speed region side, in the time of in addition, just under the state that any one in above-mentioned first press button 23 and second press button 24 operated to high-speed region side or low-speed region side, even carry out by first press button 23 and second press button 24 realize to the handover operation of high-speed region side or to the handover operation of low-speed region side, also ignore it, not the solenoid 47a of Comparative Examples pressure-reducing valve 47 output handover operation signal.

Therefore, under the state that in above-mentioned first press button 23 and second press button 24 any one operated to high-speed region side or low-speed region side, as long as this quilt is become neutral condition to first press button 23 or second press button, the 24 temporary transient returns of high-speed region side or the operation of low-speed region side, high-speed region side or the operation of low-speed region side to target afterwards gets final product.

When being switched, above-mentioned second press button 24 is operable to when running at a low speed the zone, the solenoid 47a of the transfer valve that is possessed from 25 pairs of harvesting speed change gears 53 of above-mentioned speed-change control device output is towards the switching command of high-speed side thereupon, make harvesting speed change gear 53 in the drive system of reaping part 3 by variable speed operation to high-speed side.

Output signal from this speed-change control device 25 carries out on/off operation for the solenoid 47a of the transfer valve of row's usefulness to pressing oil, press the row of giving of oil, supply with pressure oil and change-speed gearing (figure is outer) is operated to high-speed side with pressure cylinder (figure is outer) with variable speed operation to harvesting speed change gear 53.

(another form 1 of first embodiment)

In the above-described embodiment, show contact action that link mechanism by machinery carries out main shift lever 22 and hydraulic pump 41, carry out getting in touch of each press button 23,24 and hydraulic motor 42 via proportional pressure-reducing valve 47 or single action pressure cylinder 45, but be not limited to this, also can followingly constitute.

For example in example shown in Figure 6, main shift lever 22 can carry out the infinitely variable speeds operation neutral position N, separate configuration advancing before and after it between regional F and the back off area R, the operating position of this main shift lever 22 is detected by potentiometer 26, the speed-change control device 25 that is made of microcomputer is imported the detection signal of aforesaid operations positions.

The DYN dynamic main transformer speed motor 27 and the swash plate operating axis (not shown) of the hydraulic pump 41 of hydrostatic formula stepless speed change device 4 are linked, by these main transformer speed motor 27 variable speed operation hydraulic pumps 41, in speed-change control device 25, based on detection signal DYN dynamic main transformer speed motor 27 is carried out rotating control from the operating position of above-mentioned main shift lever 22 inputs, change the hydrostatic formula stepless speed change device 4 of operation hydraulic pump 41 the swash plate angle and carry out speed change.

And, the DYN dynamic secondary variable speed driver 28 and the swash plate operating axis (not shown) of above-mentioned hydraulic motor 42 are linked, by first press button 23 that is located at main shift lever 22 and the operation that is located at second press button of control panel side, to DYN dynamic secondary variable speed driver 28 output control signals, carry out variable speed operation from speed-change control device 25 by 28 pairs of hydraulic motors of above-mentioned secondary variable speed driver 42.

(another form 2 of first embodiment)

As press button 23,24, each being pressed into all switched when operating at a high speed and the structure of middling speed or middling speed and low speed being not limited to shown in optimum embodiment, for example can also constitute high-speed applications and middling speed purposes and middling speed purposes and lower speed applications respectively by each press button.

(another form 3 of first embodiment)

When constituting first operating parts and second operating parts, be not limited to above-mentioned such press button 23,24 that adopts, for example can also adopt the operated switch of bar etc.

(second embodiment)

Then, with reference to Fig. 7 to Figure 14 second embodiment is described.

(1)

As shown in Figure 7, reaping part 102 is supported in anterior lifting at the body that is supported by right and left caterpillar mobile devices 101 freely, right side in the front portion of body possesses Drive Section 103, left side at the rear portion of body possesses sheller unit 104, right side at the rear portion of body possesses granary 105, constitutes the combine as the head feed type of harvester one example.

As shown in Figure 8, possess engine 106 at the downside of Drive Section 103, possessing gearbox 108 near the central authorities about the front portion of body, hydrostatic formula stepless speed change device 107 is connected the top of the right side of gearbox 108.The main clutch 109 that between the output shaft 106a of the power shaft 107a of hydrostatic formula stepless speed change device 107 and engine 106, possesses the tension force form that constitutes by driving-belt and tension force belt wheel.

Like that, the output shaft 107b of hydrostatic formula stepless speed change device 107 is inserted into gearbox 108, is connected with low-speed gear 110 (power transmission shaft 112) by spline structure, is fixed with high gear 111 on power transmission shaft 112 shown in 8.Be embedded with low-speed gear 114 and high gear 115 outside on output shaft 113, relatively rotating freely, low-speed gear 110,114 and high gear 111,115 mesh together, and gearshift parts 116 slide by spline structure and unitary rotation is freely outer is embedded on the output shaft 113.Between the power shaft 102a of output shaft 113 and reaping part 102, possesses the harvesting clutch 117 of the tension force form that constitutes by driving-belt and tension force belt wheel.

As Fig. 8 and as shown in Figure 13, when the engaging piece 114a that makes gearshift parts 116 be engaged on the side of low-speed gear 114 goes up (low-speed position), the power of the output shaft 107b of hydrostatic formula stepless speed change device 107 is passed to reaping part 102 via low-speed gear 110,114 and gearshift parts 116 under lower-speed state.When the engaging piece 115a that makes gearshift parts 116 be engaged on the side of high gear 115 goes up (high speed position), the power of the output shaft 107b of hydrostatic formula stepless speed change device 107 is passed to reaping part 102 via high gear 111,115 and gearshift parts 116 under fast state.As described above, by low-speed gear 110,114 and high gear 111,115, the parts 116 etc. of shifting gears, constitute the harvesting speed change gear 118 (being equivalent to the speed change gear that reaping part is used) that free speed change becomes the height two-stage, disposed harvesting speed change gear 118 in the transmission downstream of hydrostatic formula stepless speed change device 107.

(2)

Be illustrated with regard to the operating structure that gathers in speed change gear 118 below.

As Figure 13 and as shown in Figure 14, rotate around longitudinal axis core P1 on gearbox 108 and freely be supported with operating axis 180, in the inside of gearbox 108, the motion arm 180a that is fixed in operating axis 180 engages with the parts 116 of shifting gears.In the outside of gearbox 108, fixing operation plate 180b on operating axis 180 fixes two pins 180c, 180d on operation panel 180b.

As Figure 13 and as shown in Figure 14, bending sheets and the carriage 181 that constitutes are fixed on the gearbox 108, possess two supporting part 181a, 181b on carriage 181, possess notch 181c on carriage 181.The pin 180c of operating axis 180 enters into notch 181c.The external member 182b of fixing cable 182 on the supporting part 181a of carriage 181, the internals 182a of cable 182 is connected with the pin 180c of operating axis 180, and the internals 182a of cable 182 also is connected with operation motor 183 (with reference to Figure 10).

As Figure 13 and as shown in Figure 14, insert action bars 184 on the supporting part 181b of carriage 181 free sliding ground, action bars 184 is connected with the pin 180d of operating axis 180.Fixing supporting part 184a on the end of action bars 184 possesses spring 185, by the paper left application of force of 185 pairs of action bars 184 of spring to Figure 13 and Figure 14 between the supporting part 184a of the supporting part 181b of carriage 181 and action bars 184.By spring 185 and action bars 184, operating axis 180 is by the paper clockwise direction application of force to Figure 14, and gearshift parts 116 are by a side (low-speed position) application of force that meshes to the engaging piece 114a with low-speed gear 114.

Figure 13 and state shown in Figure 14 are the state that has passed through to operate motor 183 returns the internals 182a of cable 182, are the state (low-speed position) that gearshift parts 116 and low-speed gear 114 are meshed.Under this state, the pin 180c of operating axis 180 is connected on the square end face of notch 181c of carriage 181, and operating axis 180 stops at low-speed position.

As shown in Figure 13, the side of the engaging piece 114a of low-speed gear 114 constitutes vertical surface, and the opposing party constitutes the inclined plane.Thus, under the state (low-speed position) of the engaging piece 114a of gearshift parts 116 and low-speed gear 114 engagement, when as described later when the output shaft 107b of hydrostatic formula stepless speed change device 107 (hydraulic pump 107P) transmits the power of advance side F, the vertical surface of the engaging piece 114a of butt low-speed gear 114 on gearshift parts 116, the transmission of power of advance side F is to reaping part 102.

When as described later, transmit when retreating the power of side R from the output shaft 107b of hydrostatic formula stepless speed change device 107 (hydraulic pump 107P), the inclined plane of the engaging piece 114a of butt low-speed gear 114 on gearshift parts 116, gearshift parts 116 resistance springs 185 and leaving from the engaging piece 114a of low-speed gear 114, the power that retreats side R is not passed to reaping part 102.Like this, between the engaging piece 114a of gearshift parts 116 and low-speed gear 114, constituted the one-way clutch that transmits the power of advance side F and do not transmit the power that retreats side R.

As Figure 13 and as shown in Figure 14, when pulling the internals 182a of cable 182 by operation motor 183, operating axis 180 is revolted springs 185 and is counterclockwise operated to the paper of Figure 14, and gearshift parts 116 mesh (high speed position) with the engaging piece 115a of high gear 115.Under this state, the opposing party's end face butt of the pin 180c of operating axis 180 and the notch 181c of carriage 181, operating axis 180 stops at high speed position.

(3)

Then, the structure with regard to the transmission system (craspedodrome system) of gearbox 108 is illustrated.

As shown in Figure 8, be embedded with travelling gear 119 outside relatively rotating freely on power transmission shaft 120, travelling gear 119 and low-speed gear 110 engagements, gearshift parts 121 slide by spline structure and unitary rotation is freely outer is embedded on the power transmission shaft 120.On power transmission shaft 120, be fixed with travelling gear 122,123, possess the parking brake 124 of many plates friction-type in the end of power transmission shaft 120.

As shown in Figure 8, usually, gearshift parts 121 and travelling gear 119 engagements, the power of the output shaft 107b of hydrostatic formula stepless speed change device 107 is delivered to power transmission shaft 120 via low-speed gear 110 and travelling gear 119.Owing to traction machine bodies such as faults the time, by gearshift parts 121 are left from travelling gear 119, can cut off right and left mobile devices 101 and hydrostatic formula stepless speed change device 107 in the position of gearshift parts 121, can not be subjected to the resistance ground traction machine body of hydrostatic formula stepless speed change device 107.

As shown in Figure 8, fixed conveyor gear 125 on power transmission shaft 126, travelling gear 122,125 engagements.Be embedded with the output gear 127 on the right side and a left side outside on power transmission shaft 126, relatively rotating freely, in the right side and the left side of right and left output gear 127, by spline structure on power transmission shaft 126, slides and unitary rotation freely outside the embedding right side and left engaging piece 128.The axletree 129 that possesses the right side and a left side, be fixed in the right and left travelling gear 130 and right and left output gear 127 engagements of the axletree 129 on the right side and a left side, on the end of right and left axletree 129, be connected with the sprocket wheel 101a (with reference to Fig. 7) of the mobile devices 101 on the right side and a left side.

As shown in Figure 8, equipment spring 132 between load bearing component 131 that is fixed in power transmission shaft 126 and right engaging piece 128, equipment spring 132 between travelling gear 125 and left engaging piece 128, right and left engaging piece 128 are reached the engagement side application of force of the output gear 127 on a left side to the right by spring 132.Between right output gear 127 and right engaging piece 128, form right grease chamber, between left output gear 127 and left engaging piece 128, form left grease chamber, the grease chamber that reaches a left side to the right supplies with action oil, can revolt spring 132 ground thus the engaging piece 128 on the right side and a left side is left from right and left output gear 127.

As shown in Figure 8, between right output gear 127 and right engaging piece 128, constitute engagement type right side clutch 133, between left output gear 127 and left engaging piece 128, constitute engagement type left side clutch 133.By making the right side (left side) engaging piece 128 and right (left side) output gear 127 engagements, right (left side) side clutch 133 becomes drive state, leaves from right (left side) output gear 127 by making the right side (left side) engaging piece 128, and right (left side) side clutch 133 becomes dissengaged positions.

By above structure, as shown in Figure 8, the power of the output shaft 107b of hydrostatic formula stepless speed change device 107 is via low-speed gear 110, travelling gear 119, power transmission shaft 120, travelling gear 122,125, power transmission shaft 126, right and left engaging piece 128, right and left output gear 127, right and left travelling gear 130, right and left axletree 129, be delivered to the mobile devices 101 on the right side and a left side, body is kept straight on.

(4)

Then, the structure with regard to the transmission system (turning system) of gearbox 108 is illustrated.

As shown in Figure 8, relatively rotate freely the outer gear part engagement that is embedded in travelling gear 135 and the peripheral part of right engaging piece 128 on the power transmission shaft 134, between power transmission shaft 134 and travelling gear 135, possess the clutch of shallowing turn 136.Shallowing turn clutch 136, to constitute friction multi-plate, by to the dissengaged positions application of force, is operable to drive state by supplying with action oil, is operable to dissengaged positions by discharging operation oil.

As shown in Figure 8, be embedded with turning clutch housing 137 outside relatively rotating freely on power transmission shaft 126, the travelling gear 138 that is fixed in power transmission shaft 134 meshes together with the gear part of the peripheral part of turning clutch housing 137.Turning clutch housing 137 constitutes left-right symmetry, possesses right-hand bend clutch 139 between turning clutch housing 137 and right output gear 127, possesses left-hand bend clutch 139 between turning clutch housing 137 and left output gear 127.It is multi-plate that right and left turning clutch 139 constitutes friction, is operable to drive state by supplying with action oil.At this moment, in right and left turning clutch 139, be configured to the mutual driving fit of friction plate, even discharging operation oil, right and left turning clutch 139 also becomes half drive state.

Thus, as shown in Figure 8, when shallowing turn clutch 136 when being manipulated into drive state, the power of power transmission shaft 126 via right engaging piece 128, travelling gear 135, shallow turn clutch 136, power transmission shaft 134 and travelling gear 138, with power transmission shaft 126 equidirectionals on as the transmission of power of the speed lower than power transmission shaft 126 to the clutch housing 137 of turning.Under the drive state of shallowing turn clutch 136, when right or left side clutch 133 are manipulated into dissengaged positions, when right or left turning clutch 139 is manipulated into drive state, with power transmission shaft 126 equidirectionals on than power transmission shaft 126 transmission of power of low speed to right or left output gear 127.

As shown in Figure 8, possesses brake 140 in the left side of power transmission shaft 134.It is multi-plate that brake 140 constitutes friction, is operable to on-position by supplying with action oil, is operable to disarm state by discharging operation oil.

Thus, as shown in Figure 8, when brake 140 was manipulated into on-position, via power transmission shaft 134 and travelling gear 138, turning clutch housing 137 formed on-position.Under the on-position of brake 140, when right or left side clutch 133 are manipulated into dissengaged positions, when right or left turning clutch 139 was manipulated into drive state, right or left output gear 127 formed on-positions.

As shown in Figure 8, on power transmission shaft 134, relatively rotate freely outside embedding travelling gear 141, travelling gear 123,141 engagement possesses reversing clutch 142 between power transmission shaft 134 and travelling gear 141.It is multi-plate that reversing clutch 142 constitutes friction, and quilt is operable to drive state to the dissengaged positions application of force by supplying with action oil, is operable to dissengaged positions by discharging operation oil.

Thus, as shown in Figure 8, when reversing clutch 142 is manipulated into drive state, the power of power transmission shaft 120 is via travelling gear 123,141, reversing clutch 142, power transmission shaft 134 and travelling gear 138, as with power transmission shaft 126 rightabout transmission of power to the clutch housing 137 of turning.Under the drive state of reversing clutch 142, when right or left side clutch 133 are manipulated into dissengaged positions, when right or left turning clutch 139 is manipulated into drive state, with power transmission shaft 126 rightabout transmission of power to right or left output gear 127.

(5)

Then, the hydraulic circuit structure with regard to hydrostatic formula stepless speed change device 107 is illustrated.

As shown in Figure 11, hydrostatic formula stepless speed change device 107 possesses hydraulic pump 107P and hydraulic motor the 107M speed change gear of usefulness (be equivalent to travel), connects hydraulic pump 107P and hydraulic motor 107M by a pair of oil circuit 107c.The hydraulic pump 107P of hydrostatic formula stepless speed change device 107 constitutes and can infinitely free speed change be neutral position N, advance side F and retreat side R, the swash plate of the gear lever 143 (with reference to Figure 10) that Drive Section 103 is possessed and the hydraulic pump 107P of hydrostatic formula stepless speed change device 107 is via linked connecting rod 86 mechanically contacts, the swash plate of hydraulic pump 107P by the hydrostatic formula stepless speed change device 107 of gear lever 143 operation is operable to hydrostatic formula stepless speed change device 107 neutral position N, advance side F and retreats side R.

As shown in Figure 11, on the power shaft 107a of hydrostatic formula stepless speed change device 107, connect charge pump 144, power shaft 107a by hydrostatic formula stepless speed change device 107 drives charge pump 144, be connected with the oil circuit 107c of hydrostatic formula stepless speed change device 107 from charge pump 144 extended reinforced oil circuits 145, on reinforced oil circuit 145, possess filter 149.Supply with oil circuit 147 being connected with 144 of charge pumps, possess filter 148 supplying with on the oil circuit 147 with fuel tank 146 that gearbox was arranged in 108 minutes.

As shown in Figure 11, the hydraulic motor 107M of hydrostatic formula stepless speed change device 107 constitutes the high speed position of the mobile usefulness of travelling of the free speed change one-tenth of energy, the middling speed position that the harvesting operation is used and the lodging of gathering in the violent crop that lodges and gathers in the low-speed position that operation is used.The operating pressure cylinder 156 that possesses the swash plate of the hydraulic motor 107M that operates hydrostatic formula stepless speed change device 107 branches out oil circuit 157 from reinforced oil circuit 145, possesses the control valve 158 that comes operating operation pressure cylinder 156 to the action oil of row's operation oil circuit 157.

As shown in Figure 11, connect safety valve 150 on reinforced oil circuit 145, safety valve 150 is connected with the housing 151 of accommodating hydrostatic formula stepless speed change device 107.Be connected oil circuit 152 146 of housing 151 and fuel tanks, on oil circuit 152, possess oil cooler 153.Be connected with oil circuit 154 between the charge pump 144 in supplying with oil circuit 147 and the part between the filter 148 and housing 151 in the oil circuit 152 and the part between the oil cooler 153, on oil circuit 154, possess open and close valve 155.Open and close valve 155 quilts constitute the pilot-operated type of opening towards the closed position application of force when the pressure of oil circuit 152 arrives regulation low pressure.

By above structure, the action oil of fuel tank 146 supplies to the oil circuit 107c of hydrostatic formula stepless speed change device 107 via filter 148, supply oil circuit 147, charge pump 144, reinforced oil circuit 145, the action oil of reinforced oil circuit 145 is operated to operating pressure cylinder 156 rows of giving via oil circuit 157 and control valve 158, and remaining action oil is expelled to housing 151 via safety valve 150.Be discharged to housing 151 from the action oil of each one of hydrostatic formula stepless speed change device 107 and the action oil of control valve 158, the action oil of housing 151 turns back to fuel tank 146 by oil circuit 152 and oil cooler 153.

At this moment, as shown in Figure 11, when because the flow path resistances of oil cooler 153 etc. rise the pressure (back pressure) of oil circuit 152 when surpassing regulation low pressure, open and close valve 155 is manipulated into open position, the action oil of oil circuit 152 is supplied to supplies with oil circuit 147, and the pressure that has suppressed in oil circuit 152 and the oil cooler 153 rises.

(6)

Then, the operation with regard to the hydraulic motor 107M of hydrostatic formula stepless speed change device 107, harvesting clutch 17 and harvesting speed change gear 18 is illustrated.

As shown in Figure 10, in the holding part 143a on the top of gear lever 143, bottom in the side surface part of the holding part of gear lever 143 143a possesses the varying speed switch of travelling 187 (being equivalent to the manual operation part), possesses harvesting varying speed switch 188 (being equivalent to the manual operation part) on the top of the rear face of the holding part of gear lever 143 143a.Travel varying speed switch 187 and harvesting varying speed switch 188 constitutes the button form, and by to returning side (outstanding side) application of force, the operation signal of travel varying speed switch 187 and harvesting varying speed switch 188 is transfused to control device 179.

As shown in Figure 10, operation motor 183 and harvesting clutch 117 mechanically contacts are operated harvesting clutch 117 and harvesting speed change gear 118 by an operation motor 183.Thus, by operation motor 183, show following three kinds of states: harvesting clutch 117 is manipulated into dissengaged positions and gathers in speed change gear 118 and be manipulated into lower-speed state; Harvesting clutch 117 is manipulated into drive state and gathers in speed change gear 118 and be manipulated into lower-speed state; Harvesting clutch 117 is manipulated into drive state and gathers in speed change gear 118 and be manipulated into fast state.

As shown in Figure 12, be set with mobile transport condition, standard harvesting state and low speed harvesting state, in mobile transport condition, standard harvesting state and low speed harvesting state, carry out following operation by 179 pairs of control valves 158 of control device (operating pressure cylinder 156), operation motor 183.

Mobile transport condition is such state, promptly, the hydraulic motor 107M of hydrostatic formula stepless speed change device 107 is manipulated into the high speed position that moves the usefulness of travelling, harvesting clutch 117 is manipulated into dissengaged positions, and harvesting speed change gear 118 is manipulated into low-speed position (being equivalent to will gather in the operating mechanism that clutch operating becomes dissengaged positions when setting mobile transport condition).

Standard harvesting state is such state, that is, the hydraulic motor 107M of hydrostatic formula stepless speed change device 107 is manipulated into the middling speed position that the harvesting operation is used, and harvesting clutch 117 is manipulated into drive state, and harvesting speed change gear 118 is manipulated into low-speed position.

Low speed harvesting state is such state, promptly, the hydraulic motor 107M of hydrostatic formula stepless speed change device 107 is manipulated into the lodging of the violent crop of harvesting lodging and gathers in the low-speed position that operation is used, harvesting clutch 117 is manipulated into drive state, and harvesting speed change gear 118 is manipulated into high speed position.

Pressing operation based on travel varying speed switch 187 and harvesting varying speed switch 188 carries out following operation by 179 pairs of control valves 158 of control device (operating pressure cylinder 156), operation motor 83.

As shown in Figure 12, under the state of having set mobile transport condition, when the varying speed switch 187 that travels is pressed operation, established standards harvesting state, under the state of having set standard harvesting state, when the varying speed switch 187 that travels is pressed operation, set mobile transport condition.Like this, when pressing operation travels varying speed switch 187, all alternately set mobile transport condition and standard harvesting state.

At this moment, as shown in Figure 12, under the state of having set mobile transport condition,, keep mobile transport condition even pressing operation harvesting varying speed switch 188 is also ignored this pressing operation.Set at the varying speed switch 187 that travels by pressing operation under the state of standard harvesting state, when harvesting varying speed switch 188 is pressed when operation, set low speed harvesting state (being equivalent to stop the mechanism that pins down of the situation of not setting low speed harvesting state from mobile transport condition) via standard harvesting state.

As shown in Figure 12, under the state of having set standard harvesting state, when harvesting varying speed switch 188 is pressed operation, set low speed harvesting state.Under the state of having set low speed harvesting state, when harvesting varying speed switch 188 is pressed operation, established standards harvesting state.Like this, when pressing operation harvesting varying speed switch 188, all replace established standards harvesting state and low speed harvesting state.

At this moment, as shown in Figure 12, under the state of having set low speed harvesting state, varying speed switch 187 even pressing operation travels, and also ignore this pressing operation, keep low speed harvesting state.Setting by pressing operation harvesting varying speed switch 188 under the state of standard harvesting state, when the varying speed switch 187 that travels is pressed when operation, set mobile transport condition (being equivalent to stop the mechanism that pins down of the situation that do not move transport condition from low speed harvesting setting state) via standard harvesting state.

(7)

Then, just right and left side clutch 133 (right and left engaging piece 128), right and left turning clutch 139, the hydraulic pressure unit 159 of shallowing turn clutch 136, brake 140, reversing clutch 142 row's of giving operational motion oil are illustrated.

As Fig. 8 and as shown in Figure 9, hydraulic pressure unit 159 is connected the bottom of the left side of gearbox 108.Connect hydraulic pump 160 on the power shaft 107a of hydrostatic formula stepless speed change device 107, the power shaft 107a driving hydraulic pump 160 by hydrostatic formula stepless speed change device 107 is connected with hydraulic pressure unit 159 from hydraulic pump 160 extended oil circuits 161.

As shown in Figure 9, be connected supply oil circuit 162 160 of gearbox 108 and hydraulic pumps, possess oil cooler 163 on supply oil circuit 162, hydraulic pump 160 in supplying with oil circuit 162 and the part between the oil cooler 163 possess filter 164.Be connected with bleed off circuit 165 between oil cooler 163 in supplying with oil circuit 162 in the part of gearbox 108 sides and the supply oil circuit 162 and the part between the filter 164, the flow path resistance of bleed off circuit 165 is littler than the flow path resistance of oil cooler 163.

Thus, as shown in Figure 9, the lubricating oil that is stored in the gearbox 108 is oily as action, and dividually by oil cooler 163 and bleed off circuit 165, the interflow is fed into hydraulic pump 160 by filter 164.The action oil of hydraulic pump 160 is fed into hydraulic pressure unit 159 via oil circuit 161, and the action oil of discharging from each one of hydraulic pressure unit 159 turns back to gearbox 108 as described later.

As shown in Figure 9, possess right-hand bend control valve 167, left-hand bend control valve 168, first safety valve 169, unloader 170, second safety valve 176, proportional control valve 171, turning switching control valve 172, guide operating valve 173,174 in the inside of hydraulic pressure unit 159.The oil circuit 161 of hydraulic pump 160 is connected with hydraulic pressure unit 159, is connected with the right side and left-hand bend control valve 167,168, first safety valve 169, unloader 170 on the oil circuit 166 that is connected in oil circuit 161 side by side.

As shown in Figure 9, right-hand bend control valve 167 is connected with right side clutch 133 (right engaging piece 128) and right-hand bend clutch 139, and left-hand bend control valve 168 is connected with left side clutch 133 (left engaging piece 128) and left-hand bend clutch 139.The right side and left-hand bend control valve 167,168 constitute the solenoid operated that the energy free operant becomes to supply with position 167a, 168a and drain position 167b, 168b, and quilt is to drain position 167b, the 168b application of force.Unloader 170 constitutes the solenoid operated that the energy free operant becomes off-position 170a and drain position 170b, and quilt is to the off-position 170a application of force.

As shown in Figure 9, from the right side and the oil circuit 175 of left side clutch 133 (right and left engaging piece 128) branch connect second safety valve 176, on oil circuit 175, be connected in series proportional control valve 171 and turning switching control valve 172, turning switching control valve 172 with shallow turn clutch 136, brake 140 and reversing clutch 142 and be connected.Proportional control valve 171 constitutes solenoid operated, and the oily pressure that can move is controlled.Turning switching control valve 172 constitutes the pilot operated formula that the energy free operant becomes to shallow turn (grand turn) position 172a, pivot turn (pivot turn) position 172b and super pivot turn (spin turn) position 172c, and quilt is to shallowing turn the position 172a application of force.At this moment, the safe pressure of first safety valve 169 is set at than higher value, and the safe pressure of second safety valve 176 is set at lower value.

As shown in Figure 9, guide operating valve 173 constitutes and the guide from oil circuit 175 branches is moved oil supplies to turning switching control valve 172 and be operable to pivot turn position 172b, and guide operating valve 174 constitutes and the guide from oil circuit 175 branches is moved oil supplies to turning switching control valve 172 and be operable to super pivot turn position 172c.Be formed with on the joint face (interface) of hydraulic pressure unit 159 and gearbox 108 and drain oil circuit (not shown), the action oil of right-hand bend control valve 167, left-hand bend control valve 168, first safety valve 169, unloader 170, second safety valve 176, proportional control valve 171, turning switching control valve 172, guide operating valve 173,174 turns back to gearbox 108 via draining oil circuit.

The right side and left-hand bend control valve 167,168, unloader 170, proportional control valve 171, guide operating valve 173,174 (8), (9), (10), (11) as described later are described like that, by control device 179 operations.

(8)

Then, the craspedodrome state that is just obtained by turning-bar 177 is illustrated.

As Fig. 7 and as shown in Figure 10, the turning-bar 177 that can reach left free operant to the right is arranged on the Drive Section 103, the operating position of turning-bar 177 is transfused to control device 179, and turning-bar 177 constitutes and can become in-line position N, the right side and the left first turning position R1, L1, the right side and the left second turning position R2, L2 by free operant.Turning mode switch 178 is arranged on the Drive Section 103, and the operating position of turning mode switch 178 is transfused to control device 179, and turning mode switch 178 possesses the position of shallowing turn, pivot turn position and super pivot turn position.

As Fig. 8 extremely as shown in Figure 10, irrelevant with the operating position of turning mode switch 178, when turning-bar 177 was operable to in-line position N, the right side and left-hand bend control valve 167,168 were manipulated into drain position 167b, 168b, and unloader 170 is manipulated into drain position 170b.Thus, from the right side and left side clutch 133 (right and left engaging piece 128), the right side and left-hand bend clutch 139 discharging operation oil, the right side and left side clutch 133 (right and left engaging piece 128) are manipulated into drive state, and the right side and left-hand bend clutch 139 are manipulated into half drive state.Passing ratio control valve 171 will be shallowed turn and reversing clutch 136,142 is operable to dissengaged positions, and brake 140 is operable to disarm state.

As described in Fig. 8 and above-mentioned (3), the power of the output shaft 107b of hydrostatic formula stepless speed change device 107 is via low-speed gear 110, travelling gear 119, power transmission shaft 120, travelling gear 122,125, power transmission shaft 126, the right side and left engaging piece 128, the right side and left output gear 127, the right side and Left Drive gear 130, the right side and left axletree 129 is delivered to the right side and left lateral is sailed device 101, and body is kept straight on.

(9)

Then, the state of just being realized by turning-bar 177 of shallowing turn is illustrated.

,, by guide operating valve 173,174 turning switching control valve 172 is operable to and shallows turn position 172a to as shown in Figure 10 as Fig. 8 when turning mode switch 178 is manipulated into when shallowing turn the position.Thus, when turning-bar 177 is manipulated into the right first turning position R1, right-hand bend control valve 167 is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, clutch 133 (right engaging piece 128) and right-hand bend clutch 139 are supplied with action oil to the right, right side clutch 133 (right engaging piece 128) is manipulated into dissengaged positions, and right-hand bend clutch 139 is manipulated into drive state.

As shown in Figure 8, because left-hand bend clutch 139 is half drive state, so, the power of left side clutch 133 (left engaging piece 128) is delivered to right output gear 127 from left output gear 127 and left-hand bend clutch 139 via right-hand bend clutch 139, with power transmission shaft 126 equidirectionals on than power transmission shaft 126 a little the transmission of power of low speed to right output gear 127.Thus, body slowly changes direction to the right.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the right first turning position R1, the control valve 167 of turning right as described above is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, meanwhile, via proportional control valve 171 and turning switching control valve 172 (shallowing turn position 172a), the beginning of action oil is supplied with to shallowing turn clutch 136, along with turning-bar 177 from the right first turning position R1 to the right the second turning position R2 be operated, shallow turn the operating pressure of clutch 136 by proportional control valve 171 boost operations.

As Fig. 8 extremely as shown in Figure 10, along with the operating pressure of shallowing turn clutch 136 based on the operating position of turning-bar 177 by proportional control valve 171 boost operations, the power of power transmission shaft 126 via right engaging piece 128, travelling gear 135, shallow turn clutch 136, power transmission shaft 134, travelling gear 138, turning clutch housing 137 and right-hand bend clutch 139, as with power transmission shaft 126 equidirectionals on than the low transmission of power of power transmission shaft 126 speed to right output gear 127.

At this moment, as shown in Figure 8, become from the power of left side clutch 133 (left engaging piece 128) with from the power of shallowing turn clutch 136 and be passed to state on the right output gear 127 simultaneously, so, in the operating pressure of shallowing turn clutch 136 is the scope of low pressure, power from left side clutch 133 (left engaging piece 128) surpasses from the power of shallowing turn clutch 136, by the power drive right side output gear 127 from left side clutch 133 (left engaging piece 128).Thus, in the operating pressure of shallowing turn clutch 136 was the scope of low pressure, body slowly changed direction to the right.

Then, when the operating position of turning-bar 177 becomes high pressure near the right second turning position R2, the operating pressure of shallowing turn clutch 136, as shown in Figure 8, surpass power from the power of shallowing turn clutch 136, by from the right output gear 127 of the power drive of shallowing turn clutch 136 from left side clutch 133 (left engaging piece 128).Under this state, with by comparing from the right output gear 127 of the power drive of left side clutch 133 (left engaging piece 128), by from the right output gear 127 of the power drive of shallowing turn clutch 136 time, right output gear 127 is driven with low speed, and body is shallowed turn to the right.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the left first turning position L1, left-hand bend control valve 168 is manipulated into supplies with position 168a, unloader 170 is manipulated into off-position 170a, clutch 133 (left engaging piece 128) and left-hand bend clutch 139 are supplied with action oil to the left, left side clutch 133 (left engaging piece 128) is manipulated into dissengaged positions, and left-hand bend clutch 139 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 177 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation, body is shallowed turn left.

(10)

Then, the pivot turn state of just being realized by turning-bar 177 is illustrated.

To as shown in Figure 10, when turning mode switch 178 is manipulated into the pivot turn position, turning switching control valve 172 is operable to pivot turn position 172b as Fig. 8 by guide operating valve 173,174.

Thus, when turning-bar 177 is manipulated into the right first turning position R1, right-hand bend control valve 167 is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, clutch 133 (right engaging piece 128) and right-hand bend clutch 139 are supplied with action oil to the right, right side clutch 133 (right engaging piece 128) is manipulated into dissengaged positions, and right-hand bend clutch 139 is manipulated into drive state.At this moment, because left-hand bend clutch 139 is half drive state, so same with above-mentioned (9), body slowly changes direction to the right.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the right first turning position R1, the control valve 167 of turning right as described above is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, meanwhile, via proportional control valve 171 and turning switching control valve 172 (pivot turn position 172b), the beginning of action oil is supplied with to brake 140, along with turning-bar 177 from the right first turning position R1 to the right the second turning position R2 be operated, by the operating pressure of proportional control valve 171 boost operations brakes 140.

As Fig. 8 extremely as shown in Figure 10, along with based on the operating position of turning-bar 177 operating pressure by proportional control valve 171 boost operations brakes 140, via power transmission shaft 134, travelling gear 138, turning clutch housing 137 and right-hand bend clutch 139, right output gear 127 is applied brake force.

At this moment, as shown in Figure 8, become from the power of left side clutch 133 (left engaging piece 128) with from the brake force of brake 140 and be passed to state on the right output gear 127 simultaneously, so, operating pressure at brake 140 is in the scope of low pressure, surpass brake force from the power of left side clutch 133 (left engaging piece 128), by from the right output gear 127 of the power drive of left side clutch 133 (left engaging piece 128) from brake 140.Thus, be in the scope of low pressure at the operating pressure of brake 140, body slowly changes direction to the right.

Then, when the operating pressure of the approaching right second turning position R2 of the operating position of turning-bar 177, brake 140 becomes high pressure, as shown in Figure 8, surpass power from the brake force of brake 140 from left side clutch 133 (left engaging piece 128), the brake force of origin self-retention device 140 makes right output gear 127 form on-position, and body is pivot turn to the right.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the left first turning position L1, left-hand bend control valve 168 is manipulated into supplies with position 168a, unloader 170 is manipulated into off-position 170a, clutch 133 (left engaging piece 128) and left-hand bend clutch 139 are supplied with action oil to the left, left side clutch 133 (left engaging piece 128) is manipulated into dissengaged positions, and left-hand bend clutch 139 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 177 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation, body is pivot turn left.

(11)

Then, the super pivot turn state of just being realized by turning-bar 177 is illustrated.

To as shown in Figure 10, when turning mode switch 178 is manipulated into super pivot turn position, turning switching control valve 172 is operable to super pivot turn position 172c as Fig. 8 by guide operating valve 173,174.

Thus, when turning-bar 177 is manipulated into the right first turning position R1, right-hand bend control valve 167 is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, clutch 133 (right engaging piece 128) and right-hand bend clutch 139 are supplied with action oil to the right, right side clutch 133 (right engaging piece 128) is manipulated into dissengaged positions, and right-hand bend clutch 139 is manipulated into drive state.At this moment, because left-hand bend clutch 139 is half drive state, so same with above-mentioned (9), body slowly changes direction to the right.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the right first turning position R1, the control valve 167 of turning right as described above is manipulated into supplies with position 167a, unloader 170 is manipulated into off-position 170a, meanwhile, via proportional control valve 171 and turning switching control valve 172 (super pivot turn position 172c), the beginning of action oil is supplied with to reversing clutch 142, along with turning-bar 177 from the right first turning position R1 to the right the second turning position R2 be operated, by the operating pressure of proportional control valve 171 boost operations reversing clutch 142.

As Fig. 8 extremely as shown in Figure 10, along with based on the operating position of turning-bar 177 operating pressure by proportional control valve 171 boost operations reversing clutch 142, the power of power transmission shaft 120 is via travelling gear 123,141, reversing clutch 142, power transmission shaft 134, travelling gear 138, turning clutch housing 137 and right-hand bend clutch 139, as being passed to right output gear 127 with power transmission shaft 126 rightabout power.

At this moment, as shown in Figure 8, become from the power of left side clutch 133 (left engaging piece 128) with from the power of reversing clutch 142 and be passed to state on the right output gear 127 simultaneously, so, operating pressure at reversing clutch 142 is in the scope of low pressure, surpass power from the power of left side clutch 133 (left engaging piece 128), by from the right output gear 127 of the power drive of left side clutch 133 (left engaging piece 128) from reversing clutch 142.Thus, be in the scope of low pressure at the operating pressure of reversing clutch 142, body slowly changes direction to the right.

Then, when the operating pressure of the approaching right second turning position R2 of the operating position of turning-bar 177, reversing clutch 142 becomes high pressure, as shown in Figure 8, surpass power from the power of reversing clutch 142, by from the right output gear 127 of the power drive of reversing clutch 142 from left side clutch 133 (left engaging piece 128).Under this state, with respect to left output gear 127, right output gear 127 is driven the super pivot turn of body to the right to opposite direction.

As Fig. 8 extremely as shown in Figure 10, when turning-bar 177 is manipulated into the left first turning position L1, left-hand bend control valve 168 is manipulated into supplies with position 168a, unloader 170 is manipulated into off-position 170a, clutch 133 (left engaging piece 128) and left-hand bend clutch 139 are supplied with action oil to the left, left side clutch 133 (left engaging piece 128) is manipulated into dissengaged positions, and left-hand bend clutch 139 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 177 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation the super pivot turn of body left.

(another form 1 of second embodiment)

In above-mentioned mode shown in Figure 8, can possess secondary speed-changing device (not shown) speed change gear of usefulness (be equivalent to travel) independently in the transmission downstream of power transmission shaft 112 with hydrostatic formula stepless speed change device 107, secondary speed-changing device is constituted the low-speed position that the lodging harvesting operation of the violent crop of the high speed position that can free operant becomes to move the usefulness of travelling, middling speed position that the harvesting operation is used and harvesting lodging is used.

Occasion constituting like this is operable to high speed position with secondary speed-changing device under mobile transport condition, under standard harvesting state secondary speed-changing device is operable to the middling speed position, under low speed harvesting state secondary speed-changing device is operable to low-speed position.

(another form 2 of second embodiment)

The hydraulic pump 107P that can constitute under above-mentioned mobile transport condition hydrostatic formula stepless speed change device 107 is operable to high speed position, hydraulic pump 107P with hydrostatic formula stepless speed change device 107 under standard harvesting state is operable to the middling speed position, and the hydraulic pump 107P with hydrostatic formula stepless speed change device 107 under low speed harvesting state is operable to low-speed position.

(another form 3 of second embodiment)

Can not constitute under the varying speed switch 187 that travels by pressing operation has been set the state of standard harvesting state makes harvesting clutch 117 be operating as drive state automatically, but constitute, under the state of having set standard harvesting state and low speed harvesting state, can by with travel varying speed switch 187 and harvesting varying speed switch 188 independently manual operation part (for example gathering in clutch lever) will gather in clutch 117 and be operable to drive state and dissengaged positions.At this moment, under standard harvesting state, will gather in clutch 117 and be operable to drive state by other manual operation part, if under such state, set mobile transport condition, then gather in clutch 117 and be manipulated into dissengaged positions by the pressing operation varying speed switch 187 that travels.

(another form 4 of second embodiment)

Above-mentioned travel varying speed switch 187 and harvesting varying speed switch 188 be can replace, mobile transport condition, standard harvesting state and low speed harvesting state set by a varying speed switch (being equivalent to the manual operation part) (not shown).

At this moment, gathering in the occasion that setting state moves transport condition from low speed, must gather in setting state standard harvesting state, moving transport condition from standard harvesting setting state then from low speed by varying speed switch.Setting the occasion that low speed gathers in state by varying speed switch from mobile transport condition, must be from mobile transport condition established standards harvesting state, then from standard harvesting setting state low speed harvesting state.

Travel varying speed switch 187 and harvesting varying speed switch 188 or varying speed switch can not be arranged on the holding part 143a of gear lever 143, and is arranged on the side panel of the control panel of front side portion of Drive Section 103 or horizontal sidepiece.

(another form 5 of second embodiment)

Above-mentioned harvesting speed change gear 118 can be constituted stepless free speed change (for example hydrostatic formula stepless speed change device or band stepless speed change device).

In the occasion that constitutes like this, in the time of under standard harvesting state, will gather in speed change gear 118 and be operable to low-speed position, constitute and near low-speed position, infinitely variable speeds to become suitable shift position gathering in speed change gear 118.In the time of under low speed harvesting state, will gathering in speed change gear 118 and be operable to high speed position, harvesting speed change gear 118 is constituted and can infinitely variable speeds become suitable shift position near high speed position.

(the 3rd embodiment)

Then, with reference to Figure 15 to Figure 22 the 3rd embodiment is described.

(1)

As shown in Figure 15, mobile devices 202 are supported in anterior lifting at the body that is supported by right and left caterpillar mobile devices 201 freely, right side in the front portion of body possesses Drive Section 203, left side at the rear portion of body possesses sheller unit 204, right side at the rear portion of body possesses granary 205, constitutes the combine as the head feed type of harvester one example.

As shown in Figure 16, possess engine 206 at the downside of Drive Section 203, possessing gearbox 208 near the central authorities about the front portion of body, hydrostatic formula stepless speed change device 207 is connected the top of the right side of gearbox 208.Between the output shaft 206a of the power shaft 207a of hydrostatic formula stepless speed change device 207 and engine 206, be connected with the tape handler 209 that possesses tension force clutch function.

Like that, the output shaft 207b of hydrostatic formula stepless speed change device 207 is inserted into gearbox 208, is connected with low-speed gear 210 (power transmission shaft 212) by spline structure, is fixed with high gear 211 on power transmission shaft 212 shown in 16.Be embedded with low-speed gear 214 and high gear 215 outside on output shaft 213, relatively rotating freely, low-speed gear 210,214 and high gear 211,215 mesh together, and gearshift parts 216 slide by spline structure and unitary rotation is freely outer is embedded on the output shaft 213.Between the power shaft 202a of output shaft 213 and mobile devices 202, be connected with the tape handler 217 that possesses tension force clutch function.

As shown in Figure 16, when making gearshift parts 216 be engaged on the low-speed gear 214 (low-speed position), the power of the output shaft 207b of hydrostatic formula stepless speed change device 207 is passed to mobile devices 202 via low-speed gear 210,214 and gearshift parts 216 under lower-speed state, when making gearshift parts 216 be engaged on the high gear 215 (high speed position), the power of the output shaft 207b of hydrostatic formula stepless speed change device 207 is passed to mobile devices 202 via high gear 211,215 and gearshift parts 216 under fast state.As described above, by low-speed gear 210,214 and high gear 211,215, the parts 216 etc. of shifting gears, constituted the harvesting speed change gear 218 that free speed change becomes the height two-stage.

(2)

Then, the structure with regard to the transmission system (craspedodrome system) of gearbox 208 is illustrated.

As shown in Figure 16, be embedded with travelling gear 219 outside relatively rotating freely on power transmission shaft 220, travelling gear 219 and low-speed gear 210 engagements, gearshift parts 221 slide by spline structure and unitary rotation is freely outer is embedded on the power transmission shaft 220.On power transmission shaft 220, be fixed with travelling gear 222,223, possess the parking brake 224 of many plates friction-type in the end of power transmission shaft 220.

As shown in Figure 16, usually, gearshift parts 221 and travelling gear 219 engagements, the power of the output shaft 207b of hydrostatic formula stepless speed change device 207 is delivered to power transmission shaft 220 via low-speed gear 210 and travelling gear 219.Owing to traction machine bodies such as faults the time, by gearshift parts 221 are left from travelling gear 219, can cut off right and left mobile devices 201 and hydrostatic formula stepless speed change device 207 in the position of gearshift parts 221, can not be subjected to the resistance ground traction machine body of hydrostatic formula stepless speed change device 207.

As shown in Figure 16, fixed conveyor gear 225 on power transmission shaft 226, travelling gear 222,225 engagements.Be embedded with the output gear 227 on the right side and a left side outside on power transmission shaft 226, relatively rotating freely, in the right side and the left side of right and left output gear 227, by spline structure on power transmission shaft 226, slides and unitary rotation freely outside the embedding right side and left engaging piece 228.The axletree 229 that possesses the right side and a left side, be fixed in the right and left travelling gear 230 and right and left output gear 227 engagements of the axletree 229 on the right side and a left side, on the end of right and left axletree 229, be connected with the sprocket wheel 201a (with reference to Figure 15) of the mobile devices 201 on the right side and a left side.

As shown in Figure 16, equipment spring 232 between load bearing component 231 that is fixed in power transmission shaft 226 and right engaging piece 228, equipment spring 232 between travelling gear 225 and left engaging piece 228, right and left engaging piece 228 are reached the engagement side application of force of the output gear 227 on a left side to the right by spring 232.Between right output gear 227 and right engaging piece 228, form right grease chamber, between left output gear 227 and left engaging piece 228, form left grease chamber, the grease chamber that reaches a left side to the right supplies with action oil, can revolt spring 232 thus and the engaging piece 228 on the right side and a left side is left from right and left output gear 227.

As shown in Figure 16, between right output gear 227 and right engaging piece 228, constitute engagement type right side clutch 233, between left output gear 227 and left engaging piece 228, constitute engagement type left side clutch 233.By making the right side (left side) engaging piece 228 and right (left side) output gear 227 engagements, right (left side) side clutch 233 becomes drive state, and the right side (left side) engaging piece 228 is left from right (left side) output gear 227, and right thus (left side) side clutch 233 becomes dissengaged positions.

By above structure, as shown in Figure 16, the power of the output shaft 207b of hydrostatic formula stepless speed change device 207 is via low-speed gear 210, travelling gear 219, power transmission shaft 220, travelling gear 222,225, power transmission shaft 226, right and left engaging piece 228, right and left output gear 227, right and left travelling gear 230, right and left axletree 229, be delivered to the mobile devices 201 on the right side and a left side, body is kept straight on.

(3)

Then, the structure with regard to the transmission system (turning system) of gearbox 208 is illustrated.

As shown in Figure 16, relatively rotate freely the outer gear part engagement that is embedded in travelling gear 235 and the peripheral part of right engaging piece 228 on the power transmission shaft 234, between power transmission shaft 234 and travelling gear 235, possess the clutch of shallowing turn 236.Shallowing turn clutch 236, to constitute friction multi-plate, by to the dissengaged positions application of force, is operable to drive state by supplying with action oil, is operable to dissengaged positions by discharging operation oil.

As shown in Figure 16, be embedded with turning clutch housing 237 outside relatively rotating freely on power transmission shaft 226, the travelling gear 238 that is fixed in power transmission shaft 234 meshes together with the gear part of the peripheral part of turning clutch housing 237.Turning clutch housing 237 constitutes left-right symmetry, possesses right-hand bend clutch 239 between turning clutch housing 237 and right output gear 227, possesses left-hand bend clutch 239 between turning clutch housing 237 and left output gear 227.It is multi-plate that right and left turning clutch 239 constitutes friction, is operable to drive state by supplying with action oil.At this moment, in right and left turning clutch 239, be configured to the mutual driving fit of friction plate, even discharging operation oil, right and left turning clutch 239 also becomes half drive state.

Thus, as shown in Figure 16, when shallowing turn clutch 236 when being manipulated into drive state, the power of power transmission shaft 226 via right engaging piece 228, travelling gear 235, shallow turn clutch 236, power transmission shaft 234 and travelling gear 238, as with power transmission shaft 226 equidirectionals on the transmission of power of the speed lower than power transmission shaft 226 to the clutch housing 237 of turning.Under the drive state of shallowing turn clutch 236, when right or left side clutch 233 are manipulated into dissengaged positions, when right or left turning clutch 239 is manipulated into drive state, with power transmission shaft 226 equidirectionals on than power transmission shaft 226 transmission of power of low speed to right or left output gear 227.

As shown in Figure 16, possesses brake 240 in the left side of power transmission shaft 234.It is multi-plate that brake 240 constitutes friction, is operable to on-position by supplying with action oil, is operable to disarm state by discharging operation oil.

Thus, as shown in Figure 16, when brake 240 was manipulated into on-position, via power transmission shaft 234 and travelling gear 238, turning clutch housing 237 formed on-position.Under the on-position of brake 240, when right or left side clutch 233 are manipulated into dissengaged positions, when right or left turning clutch 239 was manipulated into drive state, right or left output gear 227 formed on-positions.

As shown in Figure 16, on power transmission shaft 234, relatively rotate freely outside embedding travelling gear 241, travelling gear 223,241 engagement possesses reversing clutch 242 between power transmission shaft 234 and travelling gear 241.It is multi-plate that reversing clutch 242 constitutes friction, and quilt is operable to drive state to the dissengaged positions application of force by supplying with action oil, is operable to dissengaged positions by discharging operation oil.

Thus, as shown in Figure 16, when reversing clutch 242 is manipulated into drive state, the power of power transmission shaft 220 is via travelling gear 223,241, reversing clutch 242, power transmission shaft 234 and travelling gear 238, as with power transmission shaft 226 rightabout transmission of power to the clutch housing 237 of turning.Under the drive state of reversing clutch 242, when right or left side clutch 233 are manipulated into dissengaged positions, when right or left turning clutch 239 is manipulated into drive state, with power transmission shaft 226 rightabout transmission of power to right or left output gear 227.

(4)

Then, the hydraulic circuit structure with regard to hydrostatic formula stepless speed change device 207 is illustrated.

As shown in Figure 19, hydrostatic formula stepless speed change device 207 possesses the hydraulic pump 207P and the hydraulic motor 207M of axial plunger form, connects hydraulic pump 207P and hydraulic motor 207M by a pair of oil circuit 207c.On the power shaft 207a of hydrostatic formula stepless speed change device 207, connect charge pump 244, by the power shaft 207a driving charge pump 244 of hydrostatic formula stepless speed change device 207.

As shown in Figure 19, on the oil circuit 207c of hydrostatic formula stepless speed change device 207, connect bleed off circuit 283, be connected with bleed off circuit 283, on reinforced oil circuit 245, possess filter 49 from charge pump 244 extended reinforced oil circuits 245.In bleed off circuit 283, be connected with possess check valve 284 and restriction 285 between the oil circuit 207c of the part of reinforced oil circuit 245 and hydrostatic formula stepless speed change device 207, safety valve 286, the safe pressure of safety valve 286 is set at the maximum pressure of allowing as the integral body of hydrostatic formula stepless speed change device 207.Being connected supply oil circuit 247 with 244 of charge pumps, on supply oil circuit 247, possesses filter 248 with the gearbox 208 independent fuel tanks 246 that are provided with.

As shown in Figure 19, connect safety valve 250 on reinforced oil circuit 245, safety valve 250 is connected with the housing 251 of accommodating hydrostatic formula stepless speed change device 207.Be connected oil circuit 252 246 of housing 251 and fuel tanks, on oil circuit 252, possess oil cooler 253.Be connected with oil circuit 254 between the charge pump 244 in supplying with oil circuit 247 and the part between the filter 248 and housing 251 in the oil circuit 252 and the part between the oil cooler 253, on oil circuit 254, possess open and close valve 255.Open and close valve 255 quilts constitute the pilot-operated type of opening towards the closed position application of force when the pressure of oil circuit 252 arrives regulation low pressure.

By above structure, the action oil of fuel tank 246 via filter 248, supply with the oil circuit 207c that oil circuit 247, charge pump 244, reinforced oil circuit 245 supply to hydrostatic formula stepless speed change device 207, remaining action oil is expelled to housing 251 via safety valve 250.Action oil from each one of hydrostatic formula stepless speed change device 207 is discharged to housing 251, and the action oil of housing 251 turns back to fuel tank 246 by oil circuit 252 and oil cooler 253.

At this moment, as shown in Figure 19, when because the flow path resistances of oil cooler 253 etc. rise the pressure (back pressure) of oil circuit 252 when surpassing regulation low pressure, open and close valve 255 is manipulated into open position, the action oil of oil circuit 252 is supplied to supplies with oil circuit 247, and the pressure that has suppressed in oil circuit 252 and the oil cooler 253 rises.

(5)

Then, the operating structure with regard to hydrostatic formula stepless speed change device 207 is illustrated.

As Figure 18 and as shown in Figure 19, the hydraulic pump 207P of hydrostatic formula stepless speed change device 207 constitutes and can stepless free speed change become neutral position N, advance side F and retreat side R.The swash plate of the gear lever 243 that Drive Section 203 is possessed and the hydraulic pump 207P of hydrostatic formula stepless speed change device 207 is via linked connecting rod 280 mechanically contacts, the swash plate of hydraulic pump 207P by the hydrostatic formula stepless speed change device 207 of gear lever 243 operation is operable to the hydraulic pump 207P of hydrostatic formula stepless speed change device 207 neutral position N, advance side F and retreats side R.

As Figure 18 and as shown in Figure 19, the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 constitutes stepless free speed change in the scope of lowest speed position L and high speed position H, possesses the operating pressure cylinder 256 of swash plate of the hydraulic motor 207M of the hydrostatic formula stepless speed change device 207 of operation.Branch out oil circuit 257 from reinforced oil circuit 245,, possess the spring 256b of action bars 256 to the low speed side application of force making operating pressure cylinder 256 on the 256a of grease chamber of high-speed side action, connect oil circuit 257.The pressure-control valve 258 of Electromagnetically-operating form is arranged in the oil circuit 257, when the pressure of the 256a of the grease chamber of operating pressure cylinder 256 rises, the spring 256b of operating pressure cylinder 256 resistance operating pressure cylinders 256 moves to high-speed side, when the pressure of the 256a of the grease chamber of operating pressure cylinder 256 descends, operating pressure cylinder 256 is moved to low speed side by the spring 256b of operating pressure cylinder 256.

As shown in Figure 18, in the holding part 243a on the top of gear lever 243, possesses the varying speed switch of travelling 281 in the bottom of the side surface part of the holding part of gear lever 243 243a.The varying speed switch 281 that travels constitutes the lever switch form or the seesaw switch form of the low-speed position of the high speed position that can free operant becomes neutral position, top and below, by the application of force, the operation signal of the varying speed switch 281 that travels is transfused to control device 279 towards the neutral position.The potentiometer 282 of position that possesses the swash plate of the hydraulic motor 207M that detects hydrostatic formula stepless speed change device 207, the detected value of potentiometer 282 is transfused to control device 279, shows that the display part 287 of position of swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is arranged on the Drive Section 203.

Thus, based on the operation of the varying speed switch 281 that travels,, make 256 actions of operating pressure cylinder by control device 279 operating pressure control valves 258.

As shown in Figure 18, when the varying speed switch 281 that travels is manipulated into high speed position, supply with action oil by pressure-control valve 258 to the 256a of the grease chamber of operating pressure 256, operating pressure cylinder 256 is to the high-speed side action, and the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is operated into high-speed side.When the varying speed switch 281 that travels is operated into the neutral position, stop operating pressure cylinder 256 by pressure-control valve 258 this moment, the operation of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 stops, and the position display of the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is in display part 287.

As shown in Figure 18, when the varying speed switch 281 that travels is manipulated into low-speed position, by the grease chamber 256a discharging operation oil of pressure-control valve 258 from operating pressure cylinder 256, operating pressure cylinder 256 is to the low speed side action, and the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is operated into low speed side.When the varying speed switch 281 that travels is operated into the neutral position, stop operating pressure cylinder 256 by pressure-control valve 258 this moment, the operation of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 stops, and the position display of the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is in display part 287.

Like this, can operate at a high speed and low-speed position, the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is infinitely operated high-speed side and low speed side by the varying speed switch 281 that will travel.

When the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is crossed the desired location of the low speed of setting and when being manipulated into high-speed side, harvesting speed change gear 218 is operated low-speed position automatically by actuator (not shown) in advance.When the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is crossed the desired location of low speed and when being manipulated into low speed side, harvesting speed change gear 218 is operated high speed position automatically by actuator.

The swash plate of the hydraulic motor 207M of above-mentioned hydrostatic formula stepless speed change device 207 cross the desired location of low speed and be manipulated into low speed side, harvesting speed change gear 218 is manipulated into the state of high speed position, and is corresponding with the occasion that arrives the violent part of plant lodging in the harvesting operation of field.

(6)

Then, just right and left side clutch 233 (right and left engaging piece 228), right and left turning clutch 239, the hydraulic pressure unit 259 of shallowing turn clutch 236, brake 240, reversing clutch 242 row's of giving operational motion oil are illustrated.

As Figure 16 and as shown in Figure 17, hydraulic pressure unit 259 is connected the bottom of the left side of gearbox 208.Connect hydraulic pump 260 on the power shaft 207a of hydrostatic formula stepless speed change device 207, the power shaft 207a driving hydraulic pump 260 by hydrostatic formula stepless speed change device 207 is connected with hydraulic pressure unit 259 from hydraulic pump 260 extended oil circuits 261.

As shown in Figure 17, be connected supply oil circuit 262 260 of gearbox 208 and hydraulic pumps, possess oil cooler 263 on supply oil circuit 262, hydraulic pump 260 in supplying with oil circuit 262 and the part between the oil cooler 263 possess filter 264.Be connected with bleed off circuit 265 between oil cooler 263 in supplying with oil circuit 262 in the part of gearbox 208 sides and the supply oil circuit 262 and the part between the filter 264, the flow path resistance of bleed off circuit 265 is littler than the flow path resistance of oil cooler 263.

Thus, as shown in Figure 17, the lubricating oil that is stored in the gearbox 208 is oily as action, and dividually by oil cooler 263 and bleed off circuit 265, the interflow is fed into hydraulic pump 260 by filter 264.The action oil of hydraulic pump 260 is fed into hydraulic pressure unit 259 via oil circuit 261, and the action oil of discharging from each one of hydraulic pressure unit 259 turns back to gearbox 208 as described later.

As shown in Figure 17, possess right-hand bend control valve 267, left-hand bend control valve 268, first safety valve 269, unloader 270, second safety valve 276, proportional control valve 271, turning switching control valve 272, guide operating valve 273,274 in the inside of hydraulic pressure unit 259.The oil circuit 261 of hydraulic pump 260 is connected with hydraulic pressure unit 259, is connected with the right side and left-hand bend control valve 267,268, first safety valve 269, unloader 270 on the oil circuit 266 that is connected in oil circuit 261 side by side.

As shown in Figure 17, right-hand bend control valve 267 is connected with right side clutch 233 (right engaging piece 228) and right-hand bend clutch 239, and left-hand bend control valve 268 is connected with left side clutch 233 (left engaging piece 228) and left-hand bend clutch 239.The right side and left-hand bend control valve 267,268 constitute the solenoid operated that the energy free operant becomes to supply with position 267a, 268a and drain position 267b, 268b, and quilt is to drain position 267b, the 268b application of force.Unloader 270 constitutes the solenoid operated that the energy free operant becomes off-position 270a and drain position 270b, and quilt is to the off-position 270a application of force.

As shown in Figure 17, from the right side and the oil circuit 275 of left side clutch 233 (right and left engaging piece 228) branch connect second safety valve 276, on oil circuit 275, be connected in series proportional control valve 271 and turning switching control valve 272, turning switching control valve 272 with shallow turn clutch 236, brake 240 and reversing clutch 242 and be connected.Proportional control valve 271 constitutes solenoid operated, and the oily pressure that can move is controlled.Turning switching control valve 272 constitutes the pilot operated formula that free operant becomes to shallow turn position 272a, pivot turn position 272b and super pivot turn position 272c, and quilt is to shallowing turn the position 272a application of force.At this moment, the safe pressure of first safety valve 269 is set at than higher value, and the safe pressure of second safety valve 276 is set at lower value.

As shown in Figure 17, guide operating valve 73 constitutes and the guide from oil circuit 275 branches is moved oil supplies to turning switching control valve 272 and be operable to pivot turn position 272b, and guide operating valve 274 constitutes and the guide from oil circuit 275 branches is moved oil supplies to turning switching control valve 272 and be operable to super pivot turn position 272c.Be formed with on the joint face (interface) of hydraulic pressure unit 259 and gearbox 208 and drain oil circuit (not shown), the action oil of right-hand bend control valve 267, left-hand bend control valve 268, first safety valve 269, unloader 270, second safety valve 276, proportional control valve 271, turning switching control valve 272, guide operating valve 273,274 turns back to gearbox 208 via draining oil circuit.

The right side and left-hand bend control valve 267,268, unloader 270, proportional control valve 271, guide operating valve 273,274 (7), (8), (9), (10) as described later are described like that, by control device 279 operations.

(7)

Then, the craspedodrome state of just being realized by turning-bar 277 is illustrated.

As Figure 15 and as shown in Figure 18, the turning-bar 277 that can free reach left side operation to the right is arranged on the Drive Section 203, the operating position of turning-bar 277 is transfused to control device 279, and turning-bar 277 constitutes and can become in-line position N, the right side and the left first turning position R1, L1, the right side and the left second turning position R2, L2 by free operant.Turning mode switch 278 is arranged on the Drive Section 203, and the operating position of turning mode switch 278 is transfused to control device 279, and turning mode switch 278 possesses the position of shallowing turn, pivot turn position and super pivot turn position.

As Figure 16 extremely as shown in Figure 18, irrelevant with the operating position of turning mode switch 278, when turning-bar 277 was operable to in-line position N, the right side and left-hand bend control valve 267,268 were manipulated into drain position 267b, 268b, and unloader 270 is manipulated into drain position 270b.Thus, from the right side and left side clutch 233 (right and left engaging piece 228), the right side and left-hand bend clutch 239 discharging operation oil, the right side and left side clutch 233 (right and left engaging piece 228) are manipulated into drive state, and the right side and left-hand bend clutch 239 are manipulated into half drive state.Passing ratio control valve 271 will be shallowed turn and reversing clutch 236,242 is operable to dissengaged positions, and brake 240 is operable to disarm state.

As described in Figure 16 and above-mentioned (2), the power of the output shaft 207b of hydrostatic formula stepless speed change device 207 is via low-speed gear 210, travelling gear 219, power transmission shaft 220, travelling gear 222,225, power transmission shaft 226, the right side and left engaging piece 228, the right side and left output gear 227, the right side and Left Drive gear 230, the right side and left axletree 229 is delivered to the right side and left lateral is sailed device 201, and body is kept straight on.

(8)

Then, the state of just being realized by turning-bar 277 of shallowing turn is illustrated.

,, by guide operating valve 273,274 turning switching control valve 272 is operable to and shallows turn position 272a to as shown in Figure 18 as Figure 16 when turning mode switch 278 is manipulated into when shallowing turn the position.Thus, when turning-bar 277 is manipulated into the right first turning position R1, right-hand bend control valve 267 is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, clutch 233 (right engaging piece 228) and right-hand bend clutch 239 are supplied with action oil to the right, right side clutch 233 (right engaging piece 228) is manipulated into dissengaged positions, and right-hand bend clutch 239 is manipulated into drive state.

As shown in Figure 16, because left-hand bend clutch 239 is half drive state, so, the power of left side clutch 233 (left engaging piece 228) is delivered to right output gear 227 from left output gear 227 and left-hand bend clutch 239 via right-hand bend clutch 239, with power transmission shaft 226 equidirectionals on than power transmission shaft 226 a little the transmission of power of low speed to right output gear 227.Thus, body slowly changes direction to the right.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the right first turning position R1, the control valve 267 of turning right as described above is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, meanwhile, via proportional control valve 271 and turning switching control valve 272 (shallowing turn position 272a), the beginning of action oil is supplied with to shallowing turn clutch 236, along with turning-bar 277 from the right first turning position R1 to the right the second turning position R2 be operated, shallow turn the operating pressure of clutch 236 by proportional control valve 271 boost operations.

As Figure 16 extremely as shown in Figure 18, along with the operating pressure of shallowing turn clutch 236 based on the operating position of turning-bar 277 by proportional control valve 271 boost operations, the power of power transmission shaft 226 via right engaging piece 228, travelling gear 235, shallow turn clutch 236, power transmission shaft 234, travelling gear 238, turning clutch housing 237 and right-hand bend clutch 239, as with power transmission shaft 226 equidirectionals on than the low transmission of power of power transmission shaft 226 speed to right output gear 227.

At this moment, as shown in Figure 16, become from the power of left side clutch 233 (left engaging piece 228) with from the power of shallowing turn clutch 236 and be passed to state on the right output gear 227 simultaneously, so, in the operating pressure of shallowing turn clutch 236 is the scope of low pressure, power from left side clutch 233 (left engaging piece 228) surpasses from the power of shallowing turn clutch 236, by the power drive right side output gear 227 from left side clutch 233 (left engaging piece 228).Thus, in the operating pressure of shallowing turn clutch 236 was the scope of low pressure, body slowly changed direction to the right.

Then, when the operating position of turning-bar 277 becomes high pressure near the right second turning position R2, the operating pressure of shallowing turn clutch 236, as shown in Figure 16, surpass power from the power of shallowing turn clutch 236, by from the right output gear 227 of the power drive of shallowing turn clutch 236 from left side clutch 233 (left engaging piece 228).Under this state, with by comparing from the right output gear 227 of the power drive of left side clutch 233 (left engaging piece 228), by from the right output gear 227 of the power drive of shallowing turn clutch 236 time, right output gear 227 is driven with low speed, and body is shallowed turn to the right.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the left first turning position L1, left-hand bend control valve 268 is manipulated into supplies with position 268a, unloader 270 is manipulated into off-position 270a, clutch 233 (left engaging piece 228) and left-hand bend clutch 239 are supplied with action oil to the left, left side clutch 233 (left engaging piece 228) is manipulated into dissengaged positions, and left-hand bend clutch 239 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 277 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation, body is shallowed turn left.

(9)

Then, the pivot turn state of just being realized by turning-bar 277 is illustrated.

To as shown in Figure 18, when turning mode switch 278 is manipulated into the pivot turn position, turning switching control valve 272 is operable to pivot turn position 272b as Figure 16 by guide operating valve 273,274.

Thus, when turning-bar 277 is manipulated into the right first turning position R1, right-hand bend control valve 267 is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, clutch 233 (right engaging piece 228) and right-hand bend clutch 239 are supplied with action oil to the right, right side clutch 233 (right engaging piece 228) is manipulated into dissengaged positions, and right-hand bend clutch 239 is manipulated into drive state.At this moment, because left-hand bend clutch 239 is half drive state, so same with above-mentioned (8), body slowly changes direction to the right.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the right first turning position R1, the control valve 267 of turning right as described above is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, meanwhile, via proportional control valve 271 and turning switching control valve 272 (pivot turn position 272b), the beginning of action oil is supplied with to brake 240, along with turning-bar 277 from the right first turning position R1 to the right the second turning position R2 be operated, by the operating pressure of proportional control valve 271 boost operations brakes 240.

As Figure 16 extremely as shown in Figure 18, along with based on the operating position of turning-bar 277 operating pressure by proportional control valve 271 boost operations brakes 240, via power transmission shaft 234, travelling gear 238, turning clutch housing 237 and right-hand bend clutch 239, right output gear 227 is applied brake force.

At this moment, as shown in Figure 16, become from the power of left side clutch 233 (left engaging piece 228) with from the brake force of brake 240 and be passed to state on the right output gear 227 simultaneously, so, operating pressure at brake 240 is in the scope of low pressure, surpass brake force from the power of left side clutch 233 (left engaging piece 228), by from the right output gear 227 of the power drive of left side clutch 233 (left engaging piece 228) from brake 240.Thus, be in the scope of low pressure at the operating pressure of brake 240, body slowly changes direction to the right.

Then, when the operating pressure of the approaching right second turning position R2 of the operating position of turning-bar 277, brake 240 becomes high pressure, as shown in Figure 16, surpass power from the brake force of brake 240 from left side clutch 233 (left engaging piece 228), the brake force of origin self-retention device 240 makes right output gear 227 form on-position, and body is pivot turn to the right.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the left first turning position L1, left-hand bend control valve 268 is manipulated into supplies with position 268a, unloader 270 is manipulated into off-position 270a, clutch 233 (left engaging piece 228) and left-hand bend clutch 239 are supplied with action oil to the left, left side clutch 233 (left engaging piece 228) is manipulated into dissengaged positions, and left-hand bend clutch 239 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 277 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation, body is pivot turn left.

(10)

Then, the super pivot turn state of just being realized by turning-bar 277 is illustrated.

To as shown in Figure 18, when turning mode switch 278 is manipulated into super pivot turn position, turning switching control valve 272 is operable to super pivot turn position 272c as Figure 16 by guide operating valve 273,274.

Thus, when turning-bar 277 is manipulated into the right first turning position R1, right-hand bend control valve 267 is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, clutch 233 (right engaging piece 228) and right-hand bend clutch 239 are supplied with action oil to the right, right side clutch 233 (right engaging piece 228) is manipulated into dissengaged positions, and right-hand bend clutch 239 is manipulated into drive state.At this moment, because left-hand bend clutch 239 is half drive state, so same with above-mentioned (8), body slowly changes direction to the right.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the right first turning position R1, the control valve 267 of turning right as described above is manipulated into supplies with position 267a, unloader 270 is manipulated into off-position 270a, meanwhile, via proportional control valve 271 and turning switching control valve 272 (super pivot turn position 272c), the beginning of action oil is supplied with to reversing clutch 242, along with turning-bar 277 from the right first turning position R1 to the right the second turning position R2 be operated, by the operating pressure of proportional control valve 271 boost operations reversing clutch 242.

As Figure 16 extremely as shown in Figure 18, along with based on the operating position of turning-bar 277 operating pressure by proportional control valve 271 boost operations reversing clutch 242, the power of power transmission shaft 220 is via travelling gear 223,241, reversing clutch 242, power transmission shaft 234, travelling gear 238, turning clutch housing 237 and right-hand bend clutch 239, as being passed to right output gear 227 with power transmission shaft 226 rightabout power.

At this moment, as shown in Figure 16, become from the power of left side clutch 233 (left engaging piece 228) with from the power of reversing clutch 242 and be passed to state on the right output gear 227 simultaneously, so, operating pressure at reversing clutch 242 is in the scope of low pressure, surpass power from the power of left side clutch 233 (left engaging piece 228), by from the right output gear 227 of the power drive of left side clutch 233 (left engaging piece 228) from reversing clutch 242.Thus, be in the scope of low pressure at the operating pressure of reversing clutch 242, body slowly changes direction to the right.

Then, when the operating pressure of the approaching right second turning position R2 of the operating position of turning-bar 277, reversing clutch 242 becomes high pressure, as shown in Figure 16, surpass power from the power of reversing clutch 242, by from the right output gear 227 of the power drive of reversing clutch 242 from left side clutch 233 (left engaging piece 228).Under this state, with respect to left output gear 227, right output gear 227 is driven the super pivot turn of body to the right to opposite direction.

As Figure 16 extremely as shown in Figure 18, when turning-bar 277 is manipulated into the left first turning position L1, left-hand bend control valve 268 is manipulated into supplies with position 268a, unloader 270 is manipulated into off-position 270a, clutch 233 (left engaging piece 228) and left-hand bend clutch 239 are supplied with action oil to the left, left side clutch 233 (left engaging piece 228) is manipulated into dissengaged positions, and left-hand bend clutch 239 is manipulated into drive state.Meanwhile carry out operation same as described above, body slowly changes direction left.When turning-bar 277 when the left first turning position L1 is manipulated into the left second turning position L2, carry out and above-mentioned same operation the super pivot turn of body left.

(another form 1 of the 3rd embodiment)

Also can be not as described above with stepless high-speed side and the low speed side of being operable to of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207, but the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is operable to a plurality of operating positions (for example five operating positions) by operating pressure cylinder 256.

At this moment, can a plurality of operating positions be changed arbitrarily and storage, can select in a plurality of operating positions one by operating operation switch (not shown) corresponding to driver's hobby.

The desired location of the low speed of She Dinging and selected operating position more in advance, when selected operating position is the fast high-speed side of assigned position than low speed, harvesting speed change gear 218 is manipulated into low-speed position automatically by actuator (not shown), when selected operating position was the low low speed side of assigned position speed than low speed, harvesting speed change gear 218 was manipulated into high speed position automatically by actuator.

(another form 2 of the 3rd embodiment)

Can also replace above-mentioned formation, by operating pressure cylinder 256 the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is operable to the high speed position of the mobile usefulness of travelling, the middling speed position that the harvesting operation is used and the lodging of gathering in the violent crop of lodging and gather in these three positions of low-speed position that operation is used.

At this moment, possess operation harvesting speed change gear 218 actuator (not shown), can free transmission and cut-out be passed to harvesting clutch (not shown), the operation harvesting clutch of the power of mobile devices 202 actuator (not shown), be located at varying speed switch that travels (not shown) and the harvesting varying speed switch (not shown) of the holding part 243a (with reference to Figure 18) of gear lever 243, the automatic operation of harvesting speed change gear 218 and harvesting clutch is as follows.

As shown in Figure 20, mobile transport condition, standard harvesting state and low speed harvesting state are set in the control device 279.

Mobile transport condition is such state, that is, the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is manipulated into high speed position, and the harvesting clutch is manipulated into dissengaged positions, and harvesting speed change gear 218 is manipulated into low-speed position.Standard harvesting state is such state, that is, the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is manipulated into the middling speed position, and the harvesting clutch is manipulated into drive state, and harvesting speed change gear 218 is manipulated into low-speed position.Low speed harvesting state is such state, that is, the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is manipulated into low-speed position, and the harvesting clutch is manipulated into drive state, and harvesting speed change gear 218 is manipulated into high speed position.

As shown in Figure 20, under the state of having set mobile transport condition, when the varying speed switch that travels is pressed operation, established standards harvesting state, under the state of having set standard harvesting state, when the varying speed switch that travels is pressed operation, set mobile transport condition.Like this, when pressing operation travels varying speed switch, all alternately set mobile transport condition and standard harvesting state.

At this moment, under the state of having set mobile transport condition,, keep mobile transport condition even pressing operation harvesting varying speed switch is also ignored this pressing operation.By the pressing operation varying speed switch that travels, under the state of having set standard harvesting state, when the harvesting varying speed switch is pressed operation, set low speed harvesting state.

As shown in Figure 20, under the state of having set standard harvesting state, when the harvesting varying speed switch is pressed operation, set low speed harvesting state.Under the state of having set low speed harvesting state, when the harvesting varying speed switch is pressed operation, established standards harvesting state.Like this, when pressing operation harvesting varying speed switch, all replace established standards harvesting state and low speed harvesting state.

At this moment, under the state of having set low speed harvesting state, the varying speed switch even pressing operation travels is also ignored this pressing operation, keeps low speed harvesting state.By pressing operation harvesting varying speed switch, under the state of having set standard harvesting state, when the varying speed switch that travels is pressed operation, set mobile transport condition.

(another form 3 of the 3rd embodiment)

In above-mentioned formation, can also possess following formation.

As Figure 18 and as shown in Figure 21, in the occasion that the 256a of grease chamber by travel varying speed switch 281 and 258 pairs of operating pressures 256 of pressure-control valve gives row's operational motion oil, the pressure of the 256a of grease chamber of operating pressure cylinder 256 is operated in the scope of minimum pressure B1 and maximum pressure B2.On hydrostatic formula stepless speed change device 207, do not apply under the no load condition of load, the relation (A1) of the pressure of the position of the swash plate of the hydraulic motor 207M of the hydrostatic formula stepless speed change device 207 of prior grasp and the 256a of grease chamber of operating pressure cylinder 256, the minimum pressure B1 of the 256a of grease chamber of operating pressure cylinder 256 is corresponding with the lowest speed position L of the hydraulic motor 207M (swash plate) of hydrostatic formula stepless speed change device 207, and the high speed position H of the hydraulic motor 207M (swash plate) of the maximum pressure B2 of the 256a of grease chamber of operating pressure cylinder 256 (being set by safety valve 250 (with reference to Figure 19)) and hydrostatic formula stepless speed change device 207 is corresponding.

Such as shown in figure 21, be maintained at the pressure of the 256a of the grease chamber of operating pressure cylinder 256 under the pressure status (swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is manipulated into the state of the position corresponding with the pressure of stipulating) of regulation, when the load that applies on hydrostatic formula stepless speed change device 207 became big, the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 was at the next low speed side that moves on to of effect of load.Thus, corresponding with the load that puts on hydrostatic formula stepless speed change device 207, grasp the relation (A2, A3 etc.) of pressure of the 256a of grease chamber of the position of swash plate of hydraulic motor 207M of hydrostatic formula stepless speed change device 207 and operating pressure cylinder 256 in advance.

Such as shown in figure 21, be maintained under the pressure status of regulation at pressure the 256a of grease chamber of operating pressure cylinder 256, detect the position of swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 by potentiometer 282 (with reference to Figure 18), judge which kind of present state is based on and concerns what (A1, A2, A3 etc.) drew, can detect the load that puts on hydrostatic formula stepless speed change device 207.Also can grasp the load that safety valve shown in Figure 19 286 is opened in advance.

As mentioned above, in the occasion that detects the load that puts on hydrostatic formula stepless speed change device 207 according to the position of the swash plate of the hydraulic motor 207M of the pressure of the 256a of grease chamber of operating pressure cylinder 256 and hydrostatic formula stepless speed change device 207, before the load that puts on hydrostatic formula stepless speed change device 207 reached the slightly little load of the load opened than safety valve 286, the position of the swash plate of the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 did not change.When the load that puts on hydrostatic formula stepless speed change device 207 reaches the slightly little load of the load opened than safety valve 286, by operating pressure cylinder 256 the hydraulic motor 207M of hydrostatic formula stepless speed change device 207 is operable to low speed side, the situation of avoiding safety valve 286 to open.

(another form 4 of the 3rd embodiment)

Can also be such as shown in figure 22, go up the speed change gear 288 (Belt-type Adjustable-speed device or solenoid iron core formula stepless speed change device etc.) that connects the infinitely variable speeds form at the output shaft 207b of hydrostatic formula stepless speed change device 207 (hydraulic motor 207M).

Thus, such as shown in figure 22, and the hydraulic motor 207M of the hydrostatic formula stepless speed change device 207 of inoperation, but give speed change gear 288 with the transmission of power of the output shaft 207b (hydraulic motor 207M) of hydrostatic formula stepless speed change device 207, operation speed change gear 288 is passed to harvesting speed change gear 218 and power transmission shaft 220 with the power of speed change gear 288 from power transmission shaft 212.

(another form 5 of the 3rd embodiment)

Above-mentioned harvesting speed change gear 218 can also be constituted infinitely variable speeds form (hydrostatic formula stepless speed change device or Belt-type Adjustable-speed device, solenoid iron core formula stepless speed change device etc.).

(the 4th embodiment)

Then, with reference to Figure 23 to Figure 30 the 4th embodiment is illustrated.

(1)

Such as shown in figure 23, front portion at the body that is supported by right and left caterpillar mobile devices 301 is supported with scaffold 302 freely around transverse axis core X lifting, possess the hydraulic pressure cylinder 303 (being equivalent to elevating mechanism) that lifting drives the single action type of scaffold 302, reaping part 304 is arranged at scaffold 302 upper supports.Right side in the front portion of body possesses Drive Section 305, possesses sheller unit 307 in the left side at the rear portion of body, possesses granary 308 on the right side at the rear portion of body, constitutes the combine as the head feed type of harvester one example.

As Figure 23 and as shown in Figure 24, in Drive Section 305, possess front panel 309, possess side panel 310 to the left side of driving seat 306 from the left side of front panel 309 in the place ahead of driving seat 306.The central portion of plate 309 possesses the liquid crystal panel 311 that carries out various demonstrations in front, and the right side of plate 309 possesses the selection dial plate 318 of action bars 312 (being equivalent to the descending operation spare and the first descending operation spare) and turn condition in front.

As Figure 23 and as shown in Figure 24, the mounting table 324 that is fixed in front panel 309 is configured in the rear side of action bars 312, can the right hand be placed on the holding part 312a that controls action bars 312 on the mounting table 324 on one side Yi Bian be seated at the driver who drives seat 306.The gear lever 313 that possesses the hydrostatic formula stepless speed change device (not shown) that operational drive uses in the front portion of side panel 310, the part that is positioned at gear lever 313 right sides in side panel 310 possesses the dial plate 314 (being equivalent to change mechanism) of setting.

(2)

Below, just the steering operation of the body that is undertaken by action bars 312 is illustrated.

As Figure 24 and as shown in Figure 25, action bars 312 constitutes and can manually go up free operant at fore-and-aft direction (lifting position U (the paper below of Figure 24) and down position D (the paper top of Figure 24)) and left and right directions (right first and second turning position R1, R2, a left side first and second turning position L1, L2), by the neutral position N application of force of the central authorities of direction forwards, backwards and left and right directions, the operating position of action bars 312 is imported into control device 315.Become to shallow turn position, pivot turn position and super pivot turn position but select dial plate 318 to constitute manual operation, select the operating position of dial plate 318 to be transfused to control device 315.

Possess: free transmission of energy and cut-out are towards the right side clutch (not shown) of the power of right travel device 301, the left side clutch (not shown) of the power of device 301 is sailed in free transmission of energy and cut-out towards left lateral, to shallow turn mechanism (not shown) to what equidirectional drove right (left side) mobile devices 301 than the low speed of a left side (right side) mobile devices 301, right (left side) mobile devices 301 are applied the arrestment mechanism (not shown) of braking, the rightabout of (right side) mobile devices 301 drives the reversing gearbox (not shown) of right (left side) mobile devices 301 left.

By action bars 312 being operable to right first and second turning position R1, R2, a left side first and second turning position L1, L2, by 315 pairs of right sides of control device and left side clutch, shallow turn mechanism, arrestment mechanism and reversing gearbox and carry out following operation.

Such as shown in figure 25, when action bars 312 was operable to neutral position N, the right side and left side clutch were manipulated into drive state, and the right side and left lateral are sailed device 301 and be driven by identical speed to equidirectional, and body is kept straight on.When action bars 312 being operable to the right first turning position R1 (the left first turning position L1), right (left side) side clutch is manipulated into dissengaged positions, and right (left side) mobile devices 301 form the state that rotates freely, and body (left side) lentamente to the right changes direction.

Such as shown in figure 25, shallow turn under the state of position will selecting dial plate 318 to be operable to, when action bars 312 being operable to the right second turning position R2 (the left second turning position L2), shallow turn mechanism action, right (left side) mobile devices 301 are by to be driven to equidirectional than a left side (right side) mobile devices 301 low speed, and body (left side) is to the right shallowed turn.

To select dial plate 318 to be operable under the state of position, original place, when action bars 312 being operable to the right second turning position R2 (the left second turning position L2), the arrestment mechanism action applies braking to right (left side) mobile devices 301, and body is (left side) pivot turn to the right.

To select dial plate 318 to be operable under the state of position, super original place, when action bars 312 being operable to the right second turning position R2 (the left second turning position L2), the reversing gearbox action, right (left side) mobile devices 301 quilts drive towards the rightabout of the mobile devices 301 on a left side (right side), and body is (left side) super pivot turn to the right.

Such as shown in figure 25, possess right turn switch 316 and left steering switch 317 on the top of the holding part of action bars 312 312a, the operation signal of the right side and left steering switch 316,317 is transfused to control device 315.When pressing operation right turn switch 316 (when carrying out pressing operation and carrying out return), right side clutch is manipulated into dissengaged positions and is manipulated into drive state immediately, when pressing operation left steering switch 317 (when carrying out pressing operation and carrying out return), the left side clutch is manipulated into dissengaged positions and is manipulated into drive state immediately.

(3)

Then, the lifting structure with regard to reaping part 304 is illustrated.

Such as shown in figure 25, possess control valve 319, by control device 315 operation control valves 319 to hydraulic pressure cylinder 303 row's of giving operational motion oil.When control valve 319 is manipulated into lifting position, supply with action oil from control valve 319 to hydraulic pressure cylinder 303, the 303 elongation actions of hydraulic pressure cylinder, reaping part 304 rises.When control valve 319 is manipulated into down position, by control valve 319 from hydraulic pressure cylinder 303 discharging operation oil, hydraulic pressure cylinder 303 contractive action, reaping part 304 descends.When control valve 319 is manipulated into the neutral position, cut off the row of giving of action oil by control valve 319, hydraulic pressure cylinder 303 and reaping part 304 stop.

As Figure 23 and as shown in Figure 25, the height sensor 320 that possesses the last lower angle that detects scaffold 302 relative bodies, the detected value of height sensor 320 is transfused to control device 315, detects the height of reaping part 304 relative bodies according to the detected value of height sensor 320.Possess direction switch 321 (being equivalent to the descending operation spare and the second descending operation spare) on the top of the holding part of action bars 312 312a, the operation signal of direction switch 321 is transfused to control device 315.

Such as shown in figure 25, set dial plate 314 and constitute manually rotating operation Cheng Guan position, the first decline limit D1, the second decline limit D2, the 3rd decline limit D3, the 4th decline limit D4, the 5th decline limit D5, the 6th decline limit D6, the operating position of setting dial plate 314 is transfused to control device 315.

(4)

Then, just be illustrated will setting the lifting that dial plate 314 is operable to the reaping part 304 that is undertaken by action bars 312 under the state (being equivalent to change the halted state of mechanism) that closes the position based on Figure 26.

Be operable under the state that closes the position (step S1) at setting dial plate 314 shown in Figure 25, when action bars 312 is operable to lifting position U (step S2), control valve 319 is manipulated into lifting position (step S4), the 303 elongation actions of hydraulic pressure cylinder, and reaping part 304 rises.When action bars 312 is operable to down position D (step S2), control valve 319 is manipulated into down position (step S6), hydraulic pressure cylinder 303 contractive action, and reaping part 304 descends.When action bars 312 is operable to neutral position N (step S2), control valve 319 is manipulated into neutral position (step S7), and hydraulic pressure cylinder 303 and reaping part 304 stop (more than be equivalent to the controlling organization and first controlling organization).

Such as shown in figure 28, with respect to the mechanical elevating scope (the mechanical elongation limit of hydraulic pressure the cylinder 303 and scope of shrinkage limit) of reaping part 304, set ceiling UU1 (below slightly of the mechanical elongation limit of hydraulic pressure cylinder 303) and decline limit DD1 (top slightly of the mechanical shrinkage limit of hydraulic pressure cylinder 303).

At this moment, such as shown in figure 28, under the state (right and left mobile devices 301 are not absorbed in the state of (entering) field surface G (ground)) on the field surface G (ground) of right and left mobile devices 301 contacts at smooth and hard, decline limit DD1 is set at the below of field surface G (ground).

Under the state that action bars 312 is operable to lifting position U (step S1, S2, S4), when detecting reaping part 304 by height sensor 320 and reach ceiling UU1 (step S3), control valve 319 is manipulated into neutral position (step S7), and reaping part 304 stops at ceiling UU1.

Under the state that action bars 312 is operable to down position D (step S1, S2, S6), when detecting reaping part 304 by height sensor 320 and reach decline limit DD1 (step S5), control valve 319 is manipulated into neutral position (step S7), and reaping part 304 stops at decline limit DD1.

Such as shown in figure 28, be operable under the state that closes the position will setting dial plate 314, by operating operation bar 312, in the first range A1 (being equivalent to the controlling organization and first controlling organization) of ceiling UU1 and decline limit DD1, can make reaping part 304 rise and descend, the optional position in the middle of can stopping at.

(5)

Then, just be illustrated will setting the lifting that dial plate 314 is operable to the reaping part 304 that is undertaken by direction switch 321 under the state (being equivalent to change the halted state of mechanism) that closes the position based on Figure 26.

As Figure 25 and as shown in Figure 28, set near the decline limit DD1 first to the 6th decline limit D1～D6 in the mode corresponding with first to the 6th decline limit D1～D6 that sets dial plate 314.In first to the 6th decline limit D1～D6, the first decline limit D1 is an extreme lower position, and the 6th decline limit D6 is the extreme higher position.

At this moment, such as shown in figure 28, under the state (right and left mobile devices 301 are not absorbed in the state of (entering) field surface G (ground)) on the field surface G (ground) of right and left mobile devices 301 contacts at smooth and hard, the first decline limit D1 is set at the below of field surface G (ground), and is set at the top slightly of decline limit DD1.

Be operable under the state that closes the position (step S1) at setting dial plate 314 shown in Figure 25, be operable at action bars 312 under the state of neutral position N or down position D (step S2), when pressing operation direction switch 321 (when pressing operation and return) (step S8), if reaping part 304 is positioned at the words (step S9) of ceiling UU1, then control valve 319 is manipulated into down position (step S10), hydraulic pressure cylinder 303 contractive action, reaping part 304 descends, when detecting the reaping part 304 arrival second decline limit D2 by height sensor 320 (step S12), control valve 319 is manipulated into neutral position (step S13), and reaping part 304 stops at the second decline limit D2 (more than be equivalent to second controlling organization) and (is equivalent under the halted state of change mechanism, above the decline limit of first controlling organization, set the state of the decline limit of second controlling organization).

At this moment, such as shown in figure 28, under the state (right and left mobile devices 301 are not absorbed in the state of (entering) field surface G (ground)) on the field surface G (ground) of right and left mobile devices 301 contacts at smooth and hard, the second decline limit D2 is set at the position roughly the same with field surface G (ground) (the perhaps top position slightly of field surface G (ground)).In the step S12 of Figure 26, also the second decline limit D2 can be changed into the 3rd decline limit D3 or the 4th decline limit D4.

Make reaping part 304 after the second decline limit D2 stops at pressing operation by direction switch 321, transfer to above-mentioned (4) described step S1～S7, can make reaping part 304 drop to decline limit DD1 by action bars 312, can make reaping part 304 rise to ceiling UU1 (more than be equivalent to first controlling organization) from the second decline limit D2 from the second decline limit D2.

Be operable under the state that closes the position (step S1) at setting dial plate 314 shown in Figure 25, be operable at action bars 312 under the state of neutral position N or down position D, when pressing operation direction switch 321 (when pressing operation and return) (step S8), if reaping part 304 is not positioned at the words (step S9) of ceiling UU1, then control valve 319 is manipulated into lifting position (step S14), the 303 elongation actions of hydraulic pressure cylinder, reaping part 304 rises, when detecting reaping part 304 arrival ceiling UU1 by height sensor 320 (step S15), control valve 319 is manipulated into neutral position (step S13), and reaping part 304 stops at ceiling UU1 (more than be equivalent to second controlling organization).

Such as shown in figure 28, be operable under the state that closes the position will setting dial plate 314, by pressing operation direction switch 321, in the second range A2 of the ceiling UU1 and the second decline limit D2 (controlling organization and second controlling organization), can make reaping part 304 rise and descend.In the first and second range A1, A2, the ceiling UU1 of the first lifting limit A1 is consistent with the ceiling UU1 of the second range A2, and the second decline limit D2 of the second range A2 is positioned at the top of the decline limit DD1 of the first range A1.

Under the state that action bars 312 is operable to lifting position U, reaping part 304 risings (step S1, S2, S4), this state preferentially and is not transferred to step S8, even pressing operation direction switch 321 does not also carry out the operation of step S9～S15.

In the decline process of the reaping part 304 in step S9～S12, when action bars 312 is operable to lifting position U (step S11), transfer to step S1, S2, S4, control valve 319 is manipulated into lifting position (step S4), the 303 elongation actions of hydraulic pressure cylinder, reaping part 304 rises.Then, as described in above-mentioned (4), transfer to step S1～S7.

(6)

Then, just be illustrated based on Figure 27 in the lifting that will set the reaping part 304 that (being equivalent to change the operating state of mechanism) under the state that dial plate 314 is operable to first to the 6th decline limit D1～D6 undertaken by action bars 312.

Be operable at setting dial plate 314 shown in Figure 25 under the state of first to the 6th decline limit D1～D6 (step S1), when action bars 312 is operable to lifting position U (step S21), control valve 319 is manipulated into lifting position (step S23), the 303 elongation actions of hydraulic pressure cylinder, reaping part 304 rises.When action bars 312 is operable to down position D (step S21), control valve 319 is manipulated into down position (step S25), hydraulic pressure cylinder 303 contractive action, and reaping part 304 descends.When action bars 312 is operable to neutral position N (step S21), control valve 319 is manipulated into neutral position (step S26), and hydraulic pressure cylinder 303 and reaping part 304 stop (more than be equivalent to first controlling organization).

Under the state that action bars 312 is operable to lifting position U (step S1, S21, S23), when detecting reaping part 304 arrival ceiling UU1 by height sensor 320 (step S22), control valve 319 is manipulated into neutral position (step S26), and reaping part 304 stops at ceiling UU1.

For example as shown in Figure 29, setting under the state of the 3rd decline limit D3 by setting dial plate 314, under the state that action bars 312 is operable to down position D (step S1, S21, S25), when detecting reaping part 304 arrival the 3rd decline limit D3 by height sensor 320 (step S24), control valve 319 is manipulated into neutral position (step S26), and reaping part 304 stops at the 3rd decline limit D3.

Such as shown in figure 29, to set under the state that dial plate 314 is operable to first to the 6th decline limit D1～D6, by operating operation bar 312, in the first range A1 (being equivalent to first controlling organization) of ceiling UU1 and first to the 6th decline limit D1～D6, can make reaping part 304 rise and descend, the optional position in the middle of can stopping at.At this moment, by operating and setting dial plate 314, can in step S24, select any one among first to the 6th decline limit D1～D6.

(7)

Then, just be illustrated based on Figure 27 in the lifting that will set the reaping part 304 that (being equivalent to change the operating state of mechanism) under the state that dial plate 314 is operable to first to the 6th decline limit D1～D6 undertaken by direction switch 321.

For example as shown in Figure 29, setting under the state of the 3rd decline limit D3 (step S1) by setting dial plate 314, action bars 312 is being operable under the state of neutral position N or down position D, when pressing operation direction switch 321 (when pressing operation and return) (step S27), if reaping part 304 is positioned at the words (step S28) of ceiling UU1, then control valve 319 is manipulated into down position (step S29), hydraulic pressure cylinder 303 contractive action, reaping part 304 descends, when detecting reaping part 304 arrival the 3rd decline limit D1 by height sensor 320 (step S31), control valve 319 is manipulated into neutral position (step S32), and reaping part 304 stops at the 3rd decline limit D3 (more than be equivalent to second controlling organization).

After reaping part 304 stops at the 3rd decline limit D3,, also can't reaping part 304 be descended from the 3rd decline limit D3 by step S24 even transfer to step S1, the S21～S26 shown in above-mentioned (6).

Be operable at setting dial plate 314 shown in Figure 25 under the state of first to the 6th decline limit D1～D6 (step S1), be operable at action bars 312 under the state of neutral position N or down position D, when pressing operation direction switch 321 (when pressing operation and return) (step S27), if reaping part 304 is not positioned at the words (step S28) of ceiling UU1, then control valve 319 is manipulated into lifting position (step S33), hydraulic pressure cylinder 303 is upheld action, reaping part 304 rises, when detecting reaping part 304 arrival ceiling UU1 by height sensor 320 (step S34), control valve 319 is manipulated into neutral position (step S32), and reaping part 304 stops at ceiling UU1 (more than be equivalent to second controlling organization).

Such as shown in figure 29, to set under the state that dial plate 314 is operable to first to the 6th decline limit D1～D6, by pressing operation direction switch 321, in the second range A2 of ceiling UU1 and first to the 6th decline limit D1～D6 (controlling organization and second controlling organization), can make reaping part 304 rise and descend.

At this moment, by operating and setting dial plate 314, in step S31, can select among first to the 6th decline limit D1～D6 arbitrarily.In the first and second range A1, A2, the ceiling UU1 of the first lifting limit A1 is consistent with the ceiling UU1 of the second range A2, and first to the 6th decline limit D1～D6 of the first lifting limit A1 is consistent with first to the 6th decline limit D1～D6 of the second range A2.

Under the state that action bars 312 is operable to lifting position U, reaping part 304 risings (step S1, S21, S23), this state is preferential, does not transfer to step S27, even pressing operation direction switch 321 does not also carry out the operation of step S28～S34.

In the decline process of the reaping part 304 in step S28～S31, when action bars 312 is operable to lifting position U (step S30), transfer to step S1, S21, S23, control valve 319 is manipulated into lifting position (step S23), the 303 elongation actions of hydraulic pressure cylinder, reaping part 304 rises.Then, as described in above-mentioned (6), transfer to step S1, S21～S26.

(another form 1 of the 4th embodiment)

Can constitute as follows, promptly, replace the direction switch 321 among above-mentioned Figure 25, such as shown in figure 30, top at the holding part of action bars 312 312a possesses: only have the rising switch 322 (being equivalent to the descending operation spare and the second descending operation spare) of the rising function of direction switch 321, and the decline switch 323 (being equivalent to the descending operation spare and the second descending operation spare) that only has the decline function of direction switch 321.

At this moment, also can on the position (for example front panel 309 or side panel 310 etc.) beyond the action bars 312, direction switch 321, rising and decline switch 322,323 be set.

Thus, when pressing operation rising switch 322 (when pressing operation and return), carry out step S33, S34, the S32 of step S14, S15, S13 and Figure 27 of Figure 26, when pressing operation decline switch 323 (when pressing operation and return), carry out step S10～S13 of Figure 26 and step S29～S32 of Figure 27.

(another form 2 of the 4th embodiment)

In the respective embodiments described above, can also not make first to the 6th decline limit D1～D6 of the first lifting limit A1 consistent, but just change first to the 6th decline limit D1～D6 of the first lifting limit A1 and first to the 6th decline limit D1～D6 of the second range A2 respectively (independence) with first to the 6th decline limit D1～D6 of the second range A2.

(another form 3 of the 4th embodiment)

In the respective embodiments described above, can also constitute and can be on one side the ceiling UU1 of the first lifting limit A1 be maintained on the identical position with the ceiling UU1 of the second range A2, Yi Bian carry out the height change.Can also constitute to distinguish and just change the ceiling UU1 of the first lifting limit A1 and the ceiling UU1 of the second range A2 (independence).

(another form 4 of the 4th embodiment)

In each above-mentioned embodiment, can possess the height sensor (ground connection sled form or ultrasonic sensor form) (not shown) of detection from field surface G (ground) to the height of reaping part 304, possesses the harvesting height controlling organization, its detected value based on height sensor makes hydraulic pressure cylinder 303 automatic expanding-contracting actions, thereby reaping part 304 is maintained apart from the setting height of field surface G (ground).

At this moment, make reaping part 304 declines by action bars 312, direction switch 321 and decline switch 323 after, when entering into the harvesting stroke, the harvesting height controlling organization begins action automatically and (for example possesses the strain root sensor (not shown) that situation that paddy bar to field surface G (ground) enters into reaping part 304 detects in the anterior bottom of reaping part 304, when strain root sensor detects the paddy bar, be judged as and enter the harvesting stroke).

(8)

The 4th embodiment with and other forms of explanation as described above.

In harvester, under the state that reaping part is positioned at surface, field (surface, field is the position of top slightly), gather in operation while advance, when once gathering in stroke end, body arrival balk, reaping part is significantly risen, carry out the turning at balk place.When the turning at balk place finishes, make reaping part drop to the surface, field and enter next and gather in stroke.

At this moment, when the surface, field exists when concavo-convex, exist the end portion (for example nearside divider) of reaping part to protrude into the protuberance on surface, field and damaged situation takes place, so, the driver need set the height on surface, the relative field of reaping part, so that the end portion of reaping part does not protrude in the protuberance on surface, field.Especially the turning at the balk place finishes to make reaping part to drop to the surface, field and enters the occasion that next gathers in stroke, and the driver need give one's full attention to the height on surface, the relative field of reaping part.

For this reason, in first feature of the 4th embodiment constitutes, freely possesses reaping part 304 in the anterior lifting of body.Possess as lifting drive the hydraulic pressure cylinder 303 of the elevating mechanism of reaping part 304, as the action bars 312 of the descending operation spare (the first descending operation spare) that is manually actuated.Ceiling UU1 above being set in and be set in below the scope of decline limit DD1 in, possesses controlling organization (first controlling organization), its operation by action bars 312 with hydraulic pressure cylinder 303 to uplifted side and decline side motion action, by the operation shut-down operation hydraulic pressure cylinder 303 of action bars 312.Possesses setting dial plate 314 as the change mechanism of the decline limit DD1 that just changes controlling organization (first controlling organization).

According to above-mentioned formation, can make reaping part 304 rise and descend by the operation of action bars 312, can reaping part 304 be stopped on the optional position.At this moment, owing to set decline limit DD1, so, in the occasion that the operation by action bars 312 will make reaping part 304 descend, reaping part 304 is descended with can't surpassing decline limit DD1.And, can just change decline limit DD1.

In addition, the concavo-convex bigger occasion on the surface, field is as long as be set in upper side with decline limit DD1.

Thus, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, if make reaping part 304 drop to the words of decline limit DD1 by action bars 312, then can guarantee the height on reaping part 304 relative surfaces, field, so, after entered the harvesting stroke when, the situation that can avoid the end portion of reaping part 304 to enter in the protuberance on surface, field takes place.Therefore, the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, need not to note too much the height on reaping part 304 relative surfaces, field.

In addition, concavo-convex bigger occasion on the surface, field, if decline limit DD1 is set in the words of upper side, then for example in the harvesting stroke, make under the state that reaping part 304 rises outwardly and descend along the field in operation by action bars 312, even cause reaping part 304 to decline to a great extent mistakenly owing to the operation of action bars 312, reaping part 304 also can stop at decline limit DD1, so the situation that can avoid the end portion of reaping part 304 to enter in the protuberance on surface, field takes place.

Therefore, in the lifting structure of reaping part 304, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, the end portion that can reduce reaping part 304 enters into the interior situation of protuberance on surface, field, has improved the harvesting performance of harvester.

In addition, for example in the harvesting stroke, make under the state that reaping part 304 rises outwardly and descend along the field in operation by action bars 312, the situation that can avoid the end portion of reaping part 304 to enter in the protuberance on surface, field takes place, and makes the harvesting performance of harvester be improved.

In addition, in second feature of the 4th embodiment constitutes, freely possesses reaping part 304 in the anterior lifting of body.Possess: the hydraulic pressure cylinder 303 that drives the elevating mechanism of reaping part 304 as lifting; As the descending operation spare that is manually actuated (the second descending operation spare), direction switch 321 or rising, decline switch 322,323.Possesses controlling organization (second controlling organization), it carries out motion action to hydraulic pressure cylinder 303, so that the ceiling UU1 above being set in and be set in below decline limit DD1, stop after operation by direction switch 321 or rising switch 322 makes reaping part 304 rise to ceiling UU1, stop after the operation by direction switch 321 or decline switch 323 makes reaping part 304 drop to decline limit DD1.Possesses setting dial plate 314 as the change mechanism of the decline limit DD1 that just changes controlling organization (second controlling organization).

According to above-mentioned formation, stop after can making reaping part 304 rise to ceiling UU1 by the operation of direction switch 321 or rising switch 322, stop after the operation by direction switch 321 or decline switch 323 makes reaping part 304 drop to decline limit DD1.At this moment, can just change decline limit DD1.

In addition, the concavo-convex bigger occasion on the surface, field is as long as be set in upper side with decline limit DD1.

Thus, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, when making reaping part 304 drop to decline limit DD1 to stop by direction switch 321 or decline switch 323, can guarantee the height on reaping part 304 relative surfaces, field, so, after entered the harvesting stroke when, the situation that can avoid the end portion of reaping part 304 to enter in the protuberance on surface, field takes place.Therefore, the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, need not to note too much the height on reaping part 304 relative surfaces, field.

Therefore, in the lifting structure of reaping part 304, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, the end portion that can reduce reaping part 304 enters into the interior situation of protuberance on surface, field, has improved the harvesting performance of harvester.

In addition, more favourable when having following formation.

With above-mentioned configuration switch 314 constitute can set for the action and halted state.Under the halted state of configuration switch 314, above the decline limit DD1 of first controlling organization, set the decline limit DD1 of second controlling organization.So constitute first controlling organization, promptly, under the halted state of configuration switch 314, after the decline limit DD1 that operation by direction switch 321 or decline switch 323 makes reaping part 304 drop to second controlling organization stops, can making reaping part 304 be elevated to uplifted side and decline side by the operation of action bars 312 from the decline limit DD1 of second controlling organization.

According to such formation, configuration switch 314 can be set for halted state (though have decline limit DD1 but can't just change the state of decline limit DD1), when configuration switch 314 is set at halted state, in the top of the decline limit DD1 of first controlling organization (as the action bars 312 of the first descending operation spare), set the decline limit DD1 of second controlling organization (as the direction switch 321 or the decline switch 323 of the second descending operation spare).

In addition, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, the decline limit DD1 that makes reaping part 304 drop to second controlling organization (as the direction switch 321 or the decline switch 323 of the second descending operation spare) by direction switch 321 or decline switch 323 stops, and can form the state of the height of having guaranteed reaping part 304 relative surfaces, field.After entered the harvesting stroke when, can make reaping part 304 rise and descend by the operation of action bars 312, can make reaping part 304 rise and descend by the operation of action bars 312 along the surface, field from the decline limit DD1 of second controlling organization (as the direction switch 321 or the decline switch 323 of the second descending operation spare).

Therefore, configuration switch 314 is being set under the state of halted state, for example the turning at the balk place finishes to make reaping part 304 to drop to the surface, field and enters the occasion that next gathers in stroke, can stop by the decline limit DD1 that direction switch 321 or decline switch 323 make reaping part 304 drop to second controlling organization (as the direction switch 321 or the decline switch 323 of the second descending operation spare), operation by action bars 312 makes reaping part 304 rise and descend along the surface, field, can transfer to the harvesting stroke swimmingly, thereby improve the harvesting performance of harvester.

At last, for easily and accompanying drawing contrast and in claims, inserted Reference numeral, but be not to be intended to protection scope of the present invention is defined in illustrated embodiment.

Claims (7)

1. harvester possesses the hydrostatic formula stepless speed change device (4) that is used for the power from engine (14) input is carried out outputing to after the speed change mobile devices (11), it is characterized in that,

Described hydrostatic formula stepless speed change device (4) possesses the hydraulic pump (41) of variable capacity type and the hydraulic motor (42) of variable capacity type, carries out the forward-reverse of body with stepless gearing method by the variable speed operation that is undertaken by described hydraulic pump (41); And,

In the speed control area of described hydraulic motor (42), set the zone of running at high speed be suitable for travelling on the road, the zone of driving at moderate speed that is suitable for the setting cane harvesting operation in the field, speed and the run at a low speed zone of be suitable for lodge cane harvesting operation lower than the travel speed in the described zone of driving at moderate speed;

Possess first operating parts (23) and second operating parts (24), first operating parts (23) and second operating parts (24) can freely be operated respectively;

Also possess the speed-change control device (25) of input from the operation signal of described first operating parts (23) and described second operating parts (24), based on the proportional pressure-reducing valve (47) of controlling the action of described hydraulic motor (42) from the operation signal of described speed-change control device (25) output, based on the action of described proportional pressure-reducing valve (47) with the swash plate of described hydraulic motor (42) to high speed outlet side or the low speed outlet side single action pressure cylinder (45) of operation that fascinates, and be located at described single action pressure cylinder (45) side and to this single action pressure cylinder (45) resetting to the described low speed outlet side application of force with spring (46a);

Described first operating parts (23) and described second operating parts (24) are linked together with described hydraulic motor (42) with spring (46a) by described speed-change control device (25), described proportional pressure-reducing valve (47), described single action pressure cylinder (45) and described resetting, described first operating parts (23) is selected the described zone and the zone of driving at moderate speed of running at high speed of a ground handover operation, and described second operating parts (24) is selected the described zone and run at a low speed the zone of driving at moderate speed of a ground handover operation.

2. harvester as claimed in claim 1 is characterized in that,

Possess the harvesting speed change gear (53) that is used for the reaping part (3) that is arranged on front part of a body is carried out speed change, in this harvesting speed change gear (53), possess transfer valve;

Be operable to describedly when running at a low speed the zone when described second operating parts (24) is switched,, described harvesting speed change gear (53) speed change become at a high speed by from the switching command of described speed-change control device (25) with respect to the solenoid (47a) of described transfer valve.

3. harvester as claimed in claim 1 or 2 is characterized in that,

First operating parts (23) is arranged on the handle (22a) of variable speed operation bar (22) that hydraulic pump (41) to hydrostatic formula stepless speed change device (4) carries out variable speed operation;

Second operating parts (24) is arranged on the control panel (21).

4. harvester as claimed in claim 1 or 2 is characterized in that,

Described single action pressure cylinder (45) constitute operating physical force by the pressure oil of the compression chamber (45a) that supplies to this single action pressure cylinder (45) with the described swash plate of described hydraulic motor (42) to the operation of fascinating of described high speed outlet side;

Described reset to constitute along with described with spring (46a) press the supply of oil and shrink, and follow described discharge of pressing oil with described single action pressure cylinder (45) to the described low speed outlet side application of force that resets;

Described proportional pressure-reducing valve (47) is arranged in the pressure feed oil circuit in the compression chamber (45a) of described single action pressure cylinder (45), action based on this proportional pressure-reducing valve (47), be discharged from and described resetting at the described high speed outgoing position that is compressed to shrinkage limit with spring (46a) and the pressure oil in the described compression chamber (45a) of resetting, supply with the pressure oil of the described reset response dynamic balance located with the centre position of the flexible scope of spring (46a) of resetting and set the middling speed outgoing position with the middle part between the low speed outgoing position of spring (46a) elongation;

The high speed outgoing position of described hydraulic motor (42) is the described zone of running at high speed, and the middling speed outgoing position is the described zone of driving at moderate speed, and the low speed outgoing position is the described zone that runs at a low speed.

5. a harvester possesses the speed change gear (107M) of the usefulness of travelling, the speed change gear (118) of reaping part (102) usefulness, the manual operation part (187,188) that is manually actuated, it is characterized in that,

Also possess the control device (179) of input from the operation signal of described manual operation part (187,188), operation motor (183) by described control device (179) operation, by described operation motor (183) operation and can freely transmit and cut off the harvesting clutch (117) of power with respect to described reaping part (102), and the control valve of the speed change gear (107M) of the described usefulness of travelling being operated by described control device (179) operation (158);

The speed change gear of the described usefulness of travelling (107M) constitutes, and can freely be operable to the low-speed position that the lodging harvesting operation of the crop of the high speed position that moves the usefulness of travelling, middling speed position that the harvesting operation is used and harvesting serious lodging is used;

The speed change gear (118) that the speed change gear (107M) that the speed change gear (118) that the speed change gear (107M) that the speed change gear (107M) of setting the described usefulness of travelling is manipulated into the mobile transport condition of high speed position, the described usefulness of travelling is manipulated into middling speed position and described reaping part (102) usefulness is manipulated into the standard harvesting state of low-speed position, the described usefulness of travelling is manipulated into low-speed position and described reaping part (102) usefulness is manipulated into the low speed harvesting state of high speed position;

The speed change gear of described manual operation part (187,188) and speed change gear (107M), described harvesting clutch (117) and the described reaping part of the described usefulness of travelling being used by described control device (179), described control valve (158) and described operation motor (183) (118) links together, and can set described mobile transport condition, described standard harvesting state and described low speed harvesting state by described manual operation part (187,188).

6. harvester as claimed in claim 5 is characterized in that,

Possess operating mechanism, when setting described mobile transport condition, described operating mechanism is operable to dissengaged positions with described harvesting clutch (117).

7. as claim 5 or 6 described harvesters, it is characterized in that,

Possess the mechanism of pining down, this pins down mechanism and stops the situation of just not setting low speed harvesting state from described mobile transport condition via standard harvesting state, and the situation of mobile transport condition is not just set in prevention via standard harvesting state from described low speed harvesting state.

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