JP5497602B2 - Transplanter - Google Patents

Description

  The present invention relates to a transplanter such as a riding rice transplanter.

  2. Description of the Related Art A transplanter equipped with a hydraulic continuously variable transmission (HST) that continuously changes traveling power and work power in accordance with an operation of a main transmission operating tool is known. For example, Patent Document 1 discloses a transplanter that stops a vehicle body by forcibly returning a hydraulic continuously variable transmission to a neutral state in accordance with an operation of the vehicle body stop operation tool. According to such a transplanter, since the conventional main clutch device for intermittently driving and driving power is not required, there is an advantage that significant cost reduction can be achieved.

  Further, Patent Document 2 includes a dismounting operation tool that can be operated from a dismounting position, and in response to an operation of the dismounting operation tool, the hydraulic continuously variable transmission is set to a slow speed forward state so A transplanter that allows forward operation is shown. According to such a transplanter, there is an advantage that entry into and exit from the field and loading and unloading onto the loading platform of the truck can be safely performed in the dismounted state.

JP 2002-225594 A Japanese Patent No. 4164039

  However, conventionally, a transplanter that has the above-described functions included in Patent Documents 1 and 2 and that can safely and reliably execute a travel stop operation and a get-off travel operation using both functions has not been realized.

The present invention has been created in order to solve these problems in view of the above-described circumstances, and is a hydraulic pressure that continuously shifts traveling power and work power in accordance with the operation of a main transmission operating tool. Type continuously variable transmission, a body stop brake device that brakes a traveling wheel, and a hydraulic continuously variable transmission is forcibly returned to a neutral state in response to an operation of the body stop operation tool, and a body stop brake device In the transplanting machine that puts the brake into a braking state, a positioning member that positions the hydraulic continuously variable transmission neutrally according to the operation of the airframe stop operating tool, and the connection between the positioning member and the hydraulic continuously variable transmission is released. In accordance with the operation of the disengagement operation member that can be operated from the dismounting position, the dismounting operation tool that can be operated from the dismounting position, and the dismounting operation tool in the state of stopping the airframe, To release the interlocking between-decided Me member and HST, characterized by and a slow-speed forward operating means for operating the very low speed advancement state hydraulic stepless transmission.
A gear-type sub-transmission mechanism that shifts driving power in response to an operation of the sub-transmission operation tool; a positioning member and a hydraulic continuously variable transmission in response to a neutral operation of the sub-transmission operation tool in a state where the airframe is stopped. And a work power shift operation permitting means for permitting a shift operation of the work power by the hydraulic continuously variable transmission.

According to the first aspect of the present invention, not only can the travel stop function and the get-off travel operation function using the hydraulic continuously variable transmission be provided, but also the travel stop operation and the get-off travel operation by both functions can be executed safely and reliably. can do.
According to the second aspect of the present invention, the working power can be changed in a state in which the machine body is reliably stopped, and the operation of the working machine can be checked.

It is a side view of a riding type rice transplanter. It is a top view of a traveling body. It is explanatory drawing which shows the transmission structure of a traveling body. It is a top view which shows the operation system of a traveling body. It is a right view which shows the operation system of a traveling body. It is a left view which shows the operating system of a traveling body. It is a principal part disassembled perspective view of an operation tool connection mechanism. It is a side view of the operation tool connection mechanism showing the operation when the machine body stop pedal is operated. It is a side view of a crossing handle. It is a side view of the operation tool connection mechanism which shows operation | movement when operating a crossing handle. It is a side view of the operation tool linkage mechanism showing a travel stop state (sub-transmission lever planting position). It is a side view of the operation tool linkage mechanism showing the planting traveling state. It is a side view of the operation tool linkage mechanism showing a travel stop state (sub-transmission lever neutral position).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a riding type rice transplanter. The riding type rice transplanter 1 includes a traveling machine body 2 and a planting work machine 4 connected to a rear portion of the traveling machine body 2 via a lifting link mechanism 3. It is prepared for. The planting machine 4 is a heavy working machine equipped with various parts and devices such as a seedling stage 5 on which seedlings are placed and a planting mechanism 6 for scraping and planting seedlings from the seedling stage 5. is there.

  As shown in FIGS. 1 and 2, the traveling machine body 2 also serves as an engine mounting portion 7 on which the engine E is mounted, a transmission case 8 for shifting engine power, an operation portion 9 on which an operator gets on, a steering wheel, and a driving wheel. It is a passenger-type four-wheel vehicle equipped with a front wheel 10 and a rear wheel 11 that is a driving wheel. A crossing handle (alighting operation tool) 12 is provided at the front end of the fuselage to perform a traveling operation from a dismounting position when crossing the shore. I have.

  As shown in FIG. 3, the power of the engine E is input to a hydraulic continuously variable transmission (HST) 14 that is a main transmission mechanism via a belt transmission mechanism 13. The engine power input to the hydraulic continuously variable transmission 14 is continuously variable in the hydraulic continuously variable transmission 14 and input to the mission case 8. The speed change operation area of the hydraulic continuously variable transmission 14 includes a neutral position (N) that is a body stop position, a forward speed change operation area (F) that advances the airframe, and a reverse speed change operation area (R) that reverses the airframe. And are included.

  In the transmission case 8, transmission shafts such as an input shaft 15, a planting transmission shaft 16, a first traveling transmission shaft 17, and a second traveling transmission shaft 18 are provided. The power input to the input shaft 15 from the hydraulic continuously variable transmission 14 is transmitted to the planting transmission shaft 16 via the inter-shaft transmission mechanism 19 and planted via the torque limiter 20 and the planting clutch 21. It is transmitted from the transmission shaft 16 to the planting PTO shaft 22. The power extracted from the planting PTO shaft 22 is transmitted to the planting work machine 4 via a transmission mechanism outside the mission case 8.

  The power input from the hydraulic continuously variable transmission 14 to the input shaft 15 is transmitted to the first travel transmission shaft 17 via the auxiliary transmission mechanism 23 and from the first travel transmission shaft 17 to the second travel transmission. It is transmitted to the shaft 18. The power transmitted to the second travel transmission shaft 18 is transmitted to the left and right front wheel drive shafts 25L and 25R via the front wheel differential mechanism 24 and also transmitted to the travel PTO shaft 26. The power extracted from the traveling PTO shaft 26 is transmitted to the rear axle case 27 via a transmission mechanism outside the transmission case 8. The sub-transmission mechanism 23 is a gear-type transmission mechanism, and is speed-changed to a neutral for cutting off power transmission, a planting speed suitable for planting travel, and a travel speed suitable for road travel.

  The rear axle case 27 is configured to transmit power to the left and right rear wheels 11 via the left and right side clutches 28L and 28R that are internally provided. The riding type rice transplanter 1 according to the present embodiment includes a leveling device 29 between the rear wheel 11 and the planting work machine 4, and the leveling device 29 is driven by the power extracted from the rear axle case 27. It is like that.

  An airframe stopping brake device 30 is provided on the traveling PTO shaft 26. When the braking operation of the airframe stop brake device 30 is performed, the neutral operation of the hydraulic continuously variable transmission 14 is also performed at the same time. This eliminates the need for a conventional main clutch device for intermittently driving power, thereby reducing costs.

  As shown in FIGS. 1 and 2, the operation unit 9 includes a driver's seat 31 on which an operator sits, a steering handle 32 for steering the front wheels 10, and a main transmission lever (main transmission operation for shifting the hydraulic continuously variable transmission 14). 33), a sub-transmission lever (sub-transmission operation tool) 34 for shifting the sub-transmission mechanism 23, a machine body stop brake device 30 and a machine body stop pedal (machine body stop operation tool) 35 for simultaneously operating the hydraulic continuously variable transmission device 14. Etc. are arranged.

  As shown in FIGS. 4 to 8, the main transmission lever 33 is provided to be rotatable in the front-rear direction with the main transmission lever shaft 36 as a fulcrum. The base end portion of the main transmission lever 33 is connected to the hydraulic continuously variable transmission 14 via a rod 37. By pushing and pulling the rod 37 according to the operation of the main transmission lever 33, the hydraulic continuously variable transmission is performed. The transmission 14 is operated to change speed.

  The auxiliary transmission lever 34 is provided so as to be rotatable in the front-rear direction with the auxiliary transmission lever shaft 38 as a fulcrum. The base end portion of the sub-transmission lever 34 is connected to the sub-transmission mechanism 23 via a rod 39. By pushing and pulling the rod 39 according to the operation of the sub-transmission lever 34, the sub-transmission mechanism 23 performs a speed change operation. It has come to be.

  The machine body stop pedal 35 can be stepped on by rotating up and down with the pedal shaft 40 as a fulcrum. The base end portion of the airframe stop pedal 35 is connected to one end portion of the brake shaft 42 via the rod 41 so that the brake shaft 42 rotates in the brake application direction in response to the depression operation of the airframe stop pedal 35. It has become.

  A spring 43 is connected to the rod 41, and the body stop pedal 35 is urged toward the brake release side by the spring 43. In addition, a parking brake lock bar 44 is provided in the vicinity of the airframe stop pedal 35, and an engagement arm 45 provided rotatably on the airframe stop pedal 35 is engaged with the parking brake lock bar 44. Thus, the airframe stop pedal 35 can be maintained in the depressed state.

  A brake operation arm 47 of the airframe stop brake device 30 is connected to an intermediate portion of the brake shaft 42 via a brake operation rod 46, and the airframe stop brake device 30 according to the rotation of the brake shaft 42 in the brake application direction. Is operated in a braking state, and the braking state of the airframe stopping brake device 30 is released in accordance with the rotation of the brake shaft 42 in the braking direction.

  The other end of the brake shaft 42 is connected to the main transmission lever 33 via a neutral forced return mechanism 48 that forcibly returns the hydraulic continuously variable transmission 14 to the neutral state in response to the depressing operation of the airframe stop pedal 35. ing. The neutral forced return mechanism 48 includes a positioning member 49 and a connection release member 50 that are rotatable with the main transmission lever shaft 36 as a fulcrum, a pair of rods 51 whose upper ends are connected to the positioning member 49, and a pair of rods 51. The lower end portion and the other end portion of the brake shaft 42 are connected to each other, and a rod 52 that pulls the pair of rods 51 downward according to the depression operation of the airframe stop pedal 35 is configured.

  The positioning member 49 is a cam member that normally rotates integrally with the main transmission lever 33 and positions the main transmission lever 33 at a plurality of preset shift operation positions. For example, the positioning member 49 of the present embodiment. 49, the plurality of notches 49a formed in the circular arc portion at the lower end and the positioning pin 53 that enters the notch 49a into a resilient shape are used to position the forward four steps, the neutral one step, and the reverse four steps. ing.

  A notch 49 b is formed at the upper end of the positioning member 49, and a pin 54 that protrudes in parallel with the main speed change lever shaft 36 from the base end of the main speed change lever 33 is engaged with the notch 49 b. Match. The linkage releasing member 50 integrally connects the positioning member 49 and the main speed change lever 33 by sandwiching the pin 54 between one end of the notch 49 b, and based on relative rotation with respect to the positioning member 49. Thus, the linkage between the positioning member 49 and the main transmission lever 33 can be released.

  Pins 55 and 56 are provided at both front and rear ends of the linkage release member 50. One pin 55 is linked to the shore handle 12 via a wire 57, and the other pin 56 is a wire 58 and a spring. 59 is connected to the auxiliary transmission lever 34 via 59. The linkage release member 50 maintains the linkage state between the positioning member 49 and the main transmission lever 33 by the urging force of the spring 59 when the auxiliary transmission lever 34 is at the planting speed or the traveling speed. Is operated or when the auxiliary transmission lever 34 is operated to the neutral position, the relative rotation with respect to the positioning member 49 releases the linkage between the positioning member 49 and the main transmission lever 33. Yes. The spring 60 provided in the linkage release member 50 is for rotating the linkage release member 50 in the linkage release direction when the auxiliary transmission lever 34 is operated to the neutral position.

  At both front and rear end portions of the positioning member 49, arc-shaped long holes 49c centering on the main transmission lever shaft 36 are formed. Pins 51a provided at the upper ends of the pair of rods 51 are slidably engaged with these long holes 49c. The pair of pins 51a are located at the upper and lower central portions of the long hole 49c when the airframe stop pedal 35 is not operated and the main transmission lever 33 is in the neutral position. Although the corresponding positioning member 49 is allowed to rotate, as shown in FIG. 8, when the pair of rods 51 are pulled downward according to the depression operation of the airframe stop pedal 35, the lower end of the long hole 49c is pushed down. Acting, the positioning member 49 is forcibly returned to the neutral position. As a result, the main shift lever 33 linked to the positioning member 49 can be forcibly returned to the neutral position from the forward shift operation region or the reverse shift operation region, and the airframe can be stopped.

  As shown in FIG. 9, the crossing handle 12 is provided at the front end portion of the machine body so as to be rotatable in the vertical direction with a rotation support shaft 61 as a fulcrum. A spring 62 for urging the shore-crossing handle 12 toward the cutting position is provided at the base end of the shore-crossing handle 12, and the tip of the shore-crossing handle 12 is moved against the urging force of the spring 62. By pushing downward by hand, the transversal handle 12 enters the entry position (slow forward operation position), and when the hand is released from the tip of the transversal handle 12, the transversal handle 12 is moved to the cutting position by the urging force of the spring 62. It comes back automatically.

  As shown in FIG. 10, the riding type rice transplanter 1 according to the embodiment of the present invention has a braking state of the airframe stop brake device 30 in accordance with the operation of the overpass handle 12 when the airframe stop pedal 35 is depressed. And a slow forward operation means for releasing the connection between the positioning member 49 and the hydraulic continuously variable transmission 14 and operating the hydraulic continuously variable transmission 14 in the slow forward state.

  The slow speed forward operation means of the present embodiment connects the wire 63 for releasing the braking state of the airframe stopping brake device 30 according to the operation of the crossing handle 12, the positioning member 49, and the hydraulic continuously variable transmission 14. The wire 57 is configured to be released and to operate the hydraulic continuously variable transmission 14 to a fine speed forward state.

  The wire 63 connects the crossing handle 12 and the brake operating arm 47. When the crossing handle 12 is operated, the brake operating arm 47 is braked against the spring 46a interposed in the brake operating rod 46. By operating to the side, the braking state of the airframe stop brake device 30 is released.

  Further, the wire 57 is connected to the handle 12 on the base end side and connected to the pin 55 of the connection release member 50 and the pin 37a (rod 37) of the main transmission lever 33 through the connection fitting 64 on the other end side. When the crossing handle 12 is operated, the pin 55 is pulled downward to rotate the linkage release member 50 relative to the positioning member 49, whereby the positioning member 49 and the main transmission lever 33 are Is released, and the pin 37a is pulled downward to operate the main speed change lever 33 (hydraulic continuously variable transmission 14) to the slow speed forward state.

  The connecting metal fitting 64 of the present embodiment separately includes a long hole portion 64a that engages with the pin 55 of the connection release member 50 and a long hole portion 64b that is connected to the pin 37a of the main transmission lever 33, and the long hole portion. The upper end of 64a is formed below the upper end of the long hole portion 64b. In this way, when the crossing handle 12 is operated, first, the pin 55 is pulled downward to release the connection between the positioning member 49 and the main transmission lever 33, and then the pin 37a is pulled downward to move the main transmission lever. Since 33 can be operated in the slow speed forward state, the slow speed forward operation by the crossing handle 12 can be smoothly performed. In addition, the connection structure through the long hole portions 64a and 64b can also avoid the inconvenience of hindering the operation of the positioning member 49 and the main speed change lever 33 when the piercing handle 12 is not operated.

  In addition, when the crossing handle 12 is released after the operation of the crossing handle 12, the reverse of the above is accompanied by the automatic return of the crossing handle 12 to the cutting position by the biasing force of the spring 52. As a result, the airframe stop brake device 30 returns to the braking state, and the hydraulic continuously variable transmission 14 enters the neutral state, and the airframe is stopped.

  Further, as shown in FIGS. 11 to 13, the riding type rice transplanter 1 according to the embodiment of the present invention has a positioning member in accordance with the neutral operation of the auxiliary transmission lever 34 in a state where the machine stop pedal 35 is depressed. 49 is provided with work power shift operation permitting means for releasing the connection between the main shift lever 49 and the main shift lever 33 and allowing the main shift lever 33 to shift the work power.

  The work power shift operation permitting means of the present embodiment is configured to include a wire 58 and a spring 59 that link the auxiliary shift lever 34 to the link release member 50. When the auxiliary transmission lever 34 is at the planting speed or the traveling speed, the wire 58 and the spring 59 pull the pin 56 of the connecting release member 50 downward by the urging force of the spring 59, as shown in FIGS. The connection state between the connection positioning member 49 and the main transmission lever 33 is maintained. On the other hand, when the auxiliary transmission lever 34 is operated to the neutral position, the wire 58 is loosened as shown in FIG. 13, and the linking force of the spring 60 causes the link release member 50 to move relative to the positioning member 49. Since it rotates and the connection between the positioning member 49 and the main speed change lever 33 is released, a shift operation of the working power by the main speed change lever 33 is allowed, and the operation check of the planting work machine 4 can be performed when the machine body is stopped. It becomes possible.

  According to the present embodiment configured as described, the hydraulic continuously variable transmission 14 that continuously changes the traveling power and the working power in accordance with the operation of the main transmission lever 33, and the traveling wheel (rear wheel 11). The vehicle body stop brake device 30 that brakes the vehicle, and the hydraulic continuously variable transmission 14 is forcibly returned to the neutral state according to the operation of the vehicle body stop pedal 35, and the vehicle body stop brake device 30 is put into a braking state. In the type rice transplanter 1, the positioning member 49 for neutrally positioning the hydraulic continuously variable transmission 14 according to the operation of the machine body stop pedal 35 and the connection between the positioning member 49 and the hydraulic continuously variable transmission 14 are released. A possible linkage release member 50, an overpass handle 12 that can be operated from the disembarking position, and an aircraft stop brake device according to the operation of the overpass handle 12 in the aircraft stop operation state And a slow-speed forward operation means for releasing the zero braking state and releasing the connection between the positioning member 49 and the hydraulic continuously variable transmission 14 so as to operate the hydraulic continuously variable transmission 14 to the very low speed forward state. Therefore, it is possible not only to have a traveling stop function and a dismounting traveling operation function using the hydraulic continuously variable transmission 14, but also to perform a traveling stopping operation and a dismounting traveling operation by both functions safely and reliably.

  Further, a gear-type sub-transmission mechanism 23 that shifts driving power in accordance with the operation of the sub-transmission lever 34, and a positioning member 49 and a hydraulic stepless transmission in accordance with a neutral operation of the sub-transmission lever 34 in a state where the machine is stopped. The operation power shift operation permitting means for releasing the connection with the device 14 and allowing the hydraulic continuously variable transmission device 14 to shift the work power is provided, so that the work power can be shifted in a state where the airframe is stopped reliably. Thus, the operation of the planting work machine 4 can be checked.

DESCRIPTION OF SYMBOLS 1 Riding type rice transplanter 2 Traveling machine body 4 Planting work machine 10 Front wheel 11 Rear wheel 14 Hydraulic stepless transmission 23 Sub transmission mechanism 30 Machine stop brake device 33 Main transmission lever 34 Sub transmission lever 35 Machine stop pedal 48 Neutral forced return Mechanism 49 Positioning member 50 Link release member

Claims (2)

A hydraulic continuously variable transmission that continuously changes the traveling power and work power in accordance with the operation of the main transmission operating tool;
A body stop brake device for braking the traveling wheel;
In the transplanting machine forcibly returning the hydraulic continuously variable transmission to the neutral state in accordance with the operation of the airframe stop operating tool and setting the airframe stop brake device to the braking state,
A positioning member that positions the hydraulic continuously variable transmission in neutral according to the operation of the airframe stop operating tool;
A linkage release member capable of releasing linkage between the positioning member and the hydraulic continuously variable transmission;
A getting-off operation tool operable from the getting-off position;
In response to the operation of the dismounting operation tool in the airframe stop operation state, the brake state of the airframe stop brake device is released, and the link between the positioning member and the hydraulic continuously variable transmission is released, and the hydraulic continuously variable transmission is A transplanting machine comprising: a slow speed forward operating means for operating in a slow speed forward state. A gear-type sub-transmission mechanism that shifts traveling power in accordance with the operation of the sub-transmission operation tool;
Work power shift that releases the link between the positioning member and the hydraulic continuously variable transmission in response to the neutral operation of the auxiliary transmission operating tool in the machine stop operation state and allows the operation power to be shifted by the hydraulic continuously variable transmission. The transplanter according to claim 1, further comprising an operation permission unit.

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