JP2018202939A - Engine section of work vehicle - Google Patents

Abstract

To improve working efficiency by raising a temperature of radiator fluid of a work vehicle up to a proper temperature quickly to enhance engine output.SOLUTION: The engine section of a work vehicle, in which a single fan (40) is arranged between an engine (20) and a radiator (30), is constituted of: a first transmission passage (W1) through which driving force of the engine (20) is transmitted to the fan (40) to normally rotationally drive the fan; a second transmission passage (W2) through which driving force of the engine (20) is transmitted to the fan (40) to reversely drive the fan; and a power switching mechanism (60) that switches a state into a state where the driving force is transmitted through the first transmission passage (W1) to the fan (40) and into a state where the driving force is transmitted through the second transmission passage (W2) to the fan (40), which can produce a fan stoppage state where driving force is not transmitted to the fan (40) through either of the first transmission passage (W1) and the second transmission passage (W2), by controlling the power switching mechanism (60).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a driving part of a work vehicle.

  2. Description of the Related Art Conventionally, in a work vehicle such as a combine, a cooling fan that sucks outside air into a radiator that cools an engine provided in a prime mover, and dust and dirt attached to a surface of the radiator and a dust-proof net disposed on the outside of the radiator And a fan for discharging dust that blows away the dust (for example, see Patent Document 1).

JP-A-2015-189386

  Generally, in cold districts and the like, the engine cooling water temperature hardly rises at the time of starting the engine, so that the engine output cannot be sufficiently exhibited, and the work efficiency is lowered.

  However, in the above-described conventional technology, the transmission mechanism that rotates the cooling fan and the transmission mechanism that rotates the dust exhaust fan are configured to be switched to the transmission state in contradiction, and the rotation of both fans is stopped. There is no technical idea to maintain the state and inhibit the cooling effect of the radiator to raise the engine cooling water temperature.

  For this reason, the engine cooling water temperature is unlikely to rise due to the wind generated by the rotation of the fan, the engine output cannot be sufficiently exhibited, and the problem that the work efficiency is lowered cannot be solved.

  The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle capable of increasing the engine cooling water temperature to an appropriate temperature at an early stage to increase engine output and improve work efficiency. .

  In order to solve the above-mentioned problems, the present invention takes the following technical means.

  That is, in the invention according to claim 1, the radiator (30) is disposed outside the engine (20), the cover (10a) having a dust filtering function is disposed outside the radiator (30), and the engine ( 20) and a radiator (30), in a prime mover of a work vehicle in which a single fan (40) is disposed, the driving force of the engine (20) is transmitted to the fan (40) to transmit the fan (40). The first transmission path (W1) that drives the fan (40) in the forward direction, and the second transmission path (W2) that transmits the driving force of the engine (20) to the fan (40) and drives the fan (40) in the reverse direction And power switching for switching between a state where the driving force is transmitted from the first transmission path (W1) to the fan (40) and a state where the driving force is transmitted from the second transmission path (W2) to the fan (40). Mechanism (60) and said motion By controlling the switching mechanism (60), a fan stop state in which no driving force is transmitted to the fan (40) from either the first power transmission path (W1) or the second power transmission path (W2) can appear. The driving part of the work vehicle is characterized by having a configuration.

  According to a second aspect of the present invention, there is provided a prime mover for a work vehicle according to the first aspect, wherein the duration of the fan stop state can be changed.

  According to a third aspect of the present invention, there is provided a driving part for a work vehicle according to the second aspect, wherein a manual operation tool (302) for changing the duration of the fan stop state is provided.

  According to a fourth aspect of the present invention, there is provided a prime mover for a work vehicle according to the second aspect, wherein the duration of the fan stop state is changed according to the water temperature of the radiator (30).

  According to a fifth aspect of the present invention, there is provided a prime mover for a work vehicle according to the second aspect, wherein the duration of the fan stop state is changed according to the exhaust temperature of the engine (20).

  According to the first aspect of the present invention, the rotation of the fan 40 is stopped and the radiator 30 and the engine 20 are brought into a state of being not cooled, so that the engine cooling water temperature can be raised to an appropriate temperature at an early stage. The work efficiency can be increased by improving the output of the engine 20.

  According to the second aspect of the present invention, the engine cooling water temperature can be adjusted by changing the duration of the stop state of the fan 40 in order to achieve the effect of the first aspect of the invention.

  According to the invention of claim 3, in order to achieve the effect of the invention of claim 2, the duration of the stop state of the fan 40 is changed by the manual operation tool 302, and the engine cooling water temperature is adjusted to an arbitrary temperature. can do.

  According to the invention of claim 4, since the stop time of the fan 40 is changed according to the water temperature of the radiator 30 in order to achieve the effect of the invention according to claim 2, for example, the lower the water temperature of the radiator 30 is, If the stop time of the fan 40 is lengthened, the engine coolant temperature can be raised to an appropriate temperature at an early stage.

  According to the fifth aspect of the invention, since the stop time of the fan 40 is changed according to the exhaust temperature of the engine 20 in order to achieve the effect of the second aspect of the invention, for example, the lower the exhaust temperature, the lower the fan If the stop time of 40 is lengthened, the engine coolant temperature can be raised to an appropriate temperature at an early stage.

It is a side view of a combine as a work vehicle concerning a reference form. It is typical explanatory drawing of the power switching mechanism in a combine same as the above. It is typical explanatory drawing by the side view of a power switching mechanism same as the above. It is explanatory drawing which shows the inside of the drive part in a combine same as the above by a front view. It is explanatory drawing by the side view which shows the layout of the fan and power switching mechanism in a combine same as the above. It is explanatory drawing which shows an example of a motion of the roller body of a tension mechanism. It is explanatory drawing which shows the example of arrangement | positioning of the pulley for normal rotation with respect to the central axis of a fan, and the pulley for reverse rotation. It is a side view of the gear case with which a power switching mechanism same as the above is provided. It is explanatory drawing by the rear view of the gear case shown in FIG. It is typical explanatory drawing which shows the modification of the pulley with which a power switching mechanism same as the above is provided. It is a block circuit diagram for control.

  A reference embodiment and an embodiment of a work vehicle according to the present invention will be described in detail with reference to the drawings. In the following, an example of a work vehicle will be described as a combine. However, the present invention is not limited to the reference embodiment and the embodiment, and various modifications may be made without departing from the scope of the invention. it can.

  Furthermore, constituent elements in the following reference embodiments and embodiments include those that can be replaced by those skilled in the art and that are easy, or substantially the same, so-called equivalent ranges.

  FIG. 1 is a side view of a combine 1 according to a reference embodiment. In the following description, the front-rear direction, the left-right direction, and the up-down direction in the normal usage mode of the combine 1 will be described as the respective front-rear direction, left-right direction, and up-down direction in each part. That is, the front-rear (X-axis) direction is the length direction of the combine 1, the left-right (Y-axis) direction is the width direction, and the up-down (Z-axis) direction is the height direction. Among these, the front is the traveling direction of the combine 1 during the cutting operation, the left is the left-hand direction toward the front, and the lower is the direction in which gravity acts. In addition, these directions are defined for convenience in order to make the explanation easy to understand, and the present invention is not limited by these directions.

<Overall configuration of combine 1>
As shown in FIG. 1, the combine 1 includes an aircraft frame 2, a traveling device 3 provided on the lower side of the aircraft frame 2, a cabin 6 provided on the upper front side of the aircraft frame 2, and a front side of the cabin 6. A reaping device 7 attached below and a threshing device (not shown) attached to the rear left side of the body frame 2 are provided.

  Further, behind the cabin 6, on the right side of the threshing device, there is provided a glen tank 8 for storing the grains threshed and selected by the threshing device. The “working device”) 9 in the section is discharged to the outside. The grain discharge auger 9 can discharge the grain stored in the grain tank 8 to the outside by driving a helical shaft (see FIG. 2) provided inside.

  An engine room is provided on the lower right side of the cabin 6 and accommodates the prime mover 10 having an engine 20 as a power source. The engine room that houses the prime mover 10 is covered with a cover 10a made of a hollow iron plate or the like having a dust filtering function.

  The prime mover 10 housed in the engine room has a radiator 30 (see FIG. 2) and a radiator fan (“fan” in the claims) 40 to cool the cooling water of the engine 20, and power from the engine 20. A power switching mechanism 60 is provided that transmits to the radiator fan 40 so as to be switched between two systems. The power switching mechanism 60 is a main part of the reference embodiment and the embodiment, and will be described in detail later together with the configuration of the driving unit 10.

<Running device 3>
The traveling device 3 includes a pair of left and right crawler belts 4 that circulate when power is transmitted from the engine 20, and the combine 1 can travel on the field by the crawler belts 4.

<Cabin 6>
The cabin 6 provided on the upper front side of the fuselage frame 2 functions as a cockpit, and is provided with a driver seat, various control levers, instruments and operation panels (not shown), and a monitor capable of displaying various information. It is done.

<Mowing device 7>
The reaping device 7 includes a weed shear for weeding the cereals in the field, a raising device for inducing the weed cereals, and a cutting blade for cutting the root of the induced cereal. The cereals that are brushed are sown with a weed cocoon, the cereals that have been weeded are raised and caused with a device, and the cereal that is caused is cut with a cutting blade.

<Moving part 10>
2 is a schematic explanatory view of the power switching mechanism 60 in the combine 1 in a plan view, FIG. 3 is a schematic explanatory view in a side view of the power switching mechanism 60, and FIG. 4 is a front view of the inside of the prime mover 10 in the combine 1. FIG. 5 is an explanatory diagram showing the layout, and FIG. 5 is an explanatory diagram showing a layout of the radiator fan 40 and the power switching mechanism 60 in the combine 1 in a side view.

  As shown in FIG. 2, the prime mover 10 disposed in the engine room includes an engine 20 disposed so that the output shaft 73 faces the right side with respect to the traveling direction of the aircraft, and the right side of the engine 20 (in FIG. 2). A radiator 30 disposed at a predetermined interval on the left side) and a single radiator fan 40 disposed between the engine 20 and the radiator 30 are provided.

  The radiator fan 40 rotates using the engine 20 as a drive source. However, in the combine 1 according to the reference embodiment and the embodiment, the output shaft 73 of the engine 20 and the rotation shaft 41 of the radiator fan 40 are directly connected. It is not linked and is linked by belt drive. That is, as shown in FIG. 3, the rotating shaft 41 of the radiator fan 40 is disposed above the output shaft 73 of the engine 20.

  That is, as shown in FIG. 2, the driving unit 10 includes a first belt 51 that rotates the radiator fan 40 forward (for example, clockwise) as a path for transmitting power from the engine 20 to the radiator fan 40. A transmission path W1 and a second transmission path W2 including a second belt 52 that reversely rotates the radiator fan 40 (for example, counterclockwise) are provided. And in this reference form and embodiment, the power switching mechanism 60 which selectively switches between the 1st transmission path W1 and the 2nd transmission path W2 is provided.

(Power transmission path)
Here, the power transmission path including the first transmission path W1 and the second transmission path W2 for transmitting power from the engine 20 to the radiator fan 40 in the combine 1 will be described mainly with reference to FIGS. To do.

  As shown in FIG. 2, the combine 1 according to the present embodiment includes a gear case 62 in which a pair of gears 61 and 61 that mesh with each other are housed. Here, the gears 61 and 61 are spur gears.

  The gear case 62 is disposed at the lower rear of the engine 20 (see FIG. 4). The gear case 62 is provided with a first transmission shaft 71 and a second transmission shaft 72 that protrude outward. Yes. The first transmission shaft 71 is connected to one of the pair of gears 61, 61, and the second transmission shaft 72 is connected to the other gear 61. In the present reference embodiment and embodiment, the first transmission shaft 71 extends through the gear case 62 in the left-right direction, and the second transmission shaft 72 extends to the right side of the gear case 62 (left side in FIG. 2). It protrudes.

  An input pulley 82 and a forward rotation pulley 81 are juxtaposed from the inside at a portion of the first transmission shaft 71 protruding from the gear case 62 to the right side of the machine body. On the other hand, an output pulley 84 is attached to the output shaft 73 of the engine 20, and the transmission belt 50 is stretched between the output pulley 84 and the input pulley 82. In FIG. 3, a reference numeral 500 indicates a tension roller that contacts the transmission belt 50.

  Further, as shown in FIGS. 2 and 4, a reverse pulley 83 is attached to the tip of the second transmission shaft 72 positioned above the first transmission shaft 71.

  A forward rotation pulley 85 is attached to the rotating shaft 41 of the radiator fan 40 at its tip end (end on the engine 20 side), and the reverse rotation pulley 86 is disposed at a predetermined interval from the forward rotation pulley 85. It is attached to the fan 40 side.

  While the first belt 51 is stretched between the forward rotation pulley 81 attached to the first transmission shaft 71 of the gear case 62 and the forward rotation pulley 85 attached to the rotation shaft 41 of the radiator fan 40, The second belt 52 is stretched between the reverse rotation pulley 83 attached to the second transmission shaft 72 of the gear case 62 and the reverse rotation pulley 86 attached to the rotation shaft 41 of the radiator fan 40.

  That is, in this reference embodiment and embodiment, the forward rotation pulley 81 is attached to the tip of the first transmission shaft 71, and the input pulley 82 is attached to the gear case 62 side of the forward rotation pulley 81. The distance between the output pulley 84 provided on the output shaft 73 of the engine 20 and the normal rotation pulley 85 provided on the rotation shaft 41 of the radiator fan 40 is equal to the distance between the normal rotation pulley 81 and the input pulley 82 in the Y-axis direction. A first transmission path W1 that is configured to be equal and includes the transmission belt 50 and the first belt 51 is formed.

Further, the reverse rotation pulley 83 attached to the second transmission shaft 72 is arranged to be biased to the radiator fan 40 side relative to the forward rotation pulley 81 attached to the tip of the first transmission shaft 71.
The distance between the reverse rotation pulley 83 and the forward rotation pulley 81 is configured to be equal to the distance between the reverse rotation pulley 86 provided on the rotating shaft 41 of the radiator fan 40 and the normal rotation pulley 85 in the Y-axis direction. A second transmission path W2 including the belt 50, the first belt 51, and the second belt 52 is formed.

  Thus, in the driving section 10 having the first transmission path W1 and the second transmission path W2, the transmission belt 50, the first belt 51, and the second belt 52 are disposed in order from the inner side of the machine body. .

  Therefore, the power switching mechanism 60 that selectively switches between the first transmission path W1 and the second transmission path W2 can be configured compactly as will be described later, and the limited space between the engine 20 and the radiator 30 is limited. It becomes possible to arrange | position efficiently.

  Furthermore, by adopting the compact power switching mechanism 60, it is possible to efficiently arrange the entire driving section 10 in the engine room of the limited size of the combine 1, and as a result. The positional relationship between the engine 20 and the radiator 30 need not be changed from the conventional positional relationship.

  As described above, the first transmission path W1 includes the output shaft 73 and the output pulley 84 of the engine 20, the first transmission shaft 71 of the gear case 62, the input pulley 82 and the forward rotation pulley 81, and the rotation of the radiator fan 40. The shaft 41 and the forward pulley 85 are configured. Therefore, the power from the engine 20 transmitted to the radiator fan 40 by the first transmission path W1 is, as shown in FIG. 2, output shaft 73 (output pulley 84) → first transmission shaft 71 (input pulley 82 and Forward rotation pulley 81) → rotating shaft 41 (forward rotation pulley 85) is transmitted, and the radiator fan 40 rotates forward.

  The second transmission path W2 includes an output shaft 73 of the engine 20, an output pulley 84, a first transmission shaft 71 of the gear case 62, an input pulley 82, a pair of gears 61 and 61, a second transmission shaft 72, The pulley 83 for reverse rotation, the rotating shaft 41 of the radiator fan 40, and the reverse pulley 86 are comprised. Therefore, the power from the engine 20 transmitted to the radiator fan 40 through the second transmission path W2 is, as shown in FIG. 2, output shaft 73 (output pulley 84) → first transmission shaft 71 (input pulley 82). It is transmitted via the path of one gear 61 → the other gear 61 → the second transmission shaft 72 (reverse rotation pulley 83) → the rotation shaft 41 (reverse rotation pulley 86), and the radiator fan 40 rotates in the reverse direction.

  Thus, in the combine 1 which concerns on this reference form and embodiment, the cover 10a (FIG. 1) which cools the engine 20, covers the surface of the radiator 30, and the engine room by rotating the single radiator fan 40 forward or backward. ) Soot and dust adhering to the filter part can be removed.

  Incidentally, the radiator fan 40 according to the present embodiment and the embodiment is attached to the shroud 42 surrounding the radiator fan 40 via the fan support member 400 as shown in FIG.

  That is, as shown in FIGS. 4 and 5, the fan support member 400 includes a plate 410 to which the shaft portion 43 of the radiator fan 40 is attached, and the plate 410 is connected to and supported by the shroud 42 of the radiator fan 40 at both ends. Are provided with a pair of frames 421 and 422, respectively. In FIG. 4, reference numeral 44 denotes a bearing, and the shaft portion 43 of the radiator fan 40 is supported by the plate 410 via the bearing 44.

  As shown in FIG. 4, the pair of frames 421 and 422 are each formed in a flat U shape, and each end is connected to the shroud 42. At this time, both the frames 421 and 422 are installed in a C-shaped manner that gradually expands downward so as to sandwich both belts along the extending direction of the first belt 51 and the second belt 52. ing.

  The plate 410 has mounting portions 411a, b, 412a, b extending in four directions, and the respective leading end portions are connected to the frames 421, 422. As shown in the drawing, the attachment portions 411a, b, 412a, b are higher than the attachment portions 411a, 412a positioned higher in the height direction so as to correspond to the pair of frames 421, 422 arranged in a C shape. The lower mounting portions 411b and 412b are relatively long.

  Thus, since the radiator fan 40 is attached to the shroud 42 via the fan support member 400 having the above-described configuration, belt replacement work such as attachment and removal of the first belt 51 and the second belt 52 can be easily performed. It is possible to improve workability.

<Power switching mechanism 60>
Next, the power switching mechanism 60 will be described. The power switching mechanism 60 selectively switches between the first transmission path W1 and the second transmission path W2, and reliably rotates the radiator fan 40 to either the first belt 51 or the second belt 52. A tension mechanism 90 that selectively applies tension for generating force is provided.

  The tension mechanism 90 includes a roller body 91 disposed between the first belt 51 and the second belt 52 as shown in FIGS. 2 and 3. As shown in FIG. 2, the first belt 51 and the second belt 52 are separated by a distance corresponding to the distance between the forward rotation pulley 81 and the forward rotation pulley 85, and the reverse rotation pulley 83 and the reverse rotation pulley 86 in the body width direction. Is provided.

Therefore, the roller body 91 is formed to have a size equal to or larger than the width obtained by adding at least the width of the first belt 51, the width of the second belt 52, and the distance between the belts 51 and 52.
The roller body 91 is interlocked and connected to the roller movable mechanism 100 as shown in FIGS. 3 and 5.

  The tension mechanism 90 is controlled by the operation control of the motor 104 to be described later, the roller body 91 is separated from both the first belt 51 and the second belt 52, and the tension is applied to both the first belt 51 and the second belt 52. It is configured to be able to appear a state where is not granted.

  In this state, driving force is not transmitted to the radiator fan 40, and the rotation of the radiator fan 40 is maintained in a stopped state.

<Roller moving mechanism 100>
As shown in FIGS. 3 and 5, the roller movable mechanism 100 has a roller body 91 attached to one end thereof, a housing 102 that can swing around a support shaft 101, and the housing 102 that swings around the support shaft 101. A rotating body 103 to be rotated and a motor 104 as a driving unit for rotating the rotating body 103 are provided.

  The center of the rotating body 103 is connected to the output shaft 103a of the casing 106 that houses gears and the like that are linked and connected to the output shaft (not shown) of the motor 104. Are connected.

  And the base end of the spring 107 which connected the front-end | tip to the housing 102 is connected with the front-end | tip of the arm bodies 105 and 105, respectively. The tips of the two springs 107 are connected to a position where the support shaft 101 is sandwiched between them. With this configuration, when the motor 104 is rotated forward or backward, one spring 107 is pulled and the other spring 107 is loosened, so that the housing 102 swings around the support shaft 101.

  Note that a potentiometer PM that detects the rotation angle of the housing 102 is provided in the support shaft 101 portion.

  When the housing 102 swings around the support shaft 101, as shown in the figure, the roller body 91 attached to the tip of the housing 102 pushes in either the first belt 51 or the second belt 52, and the radiator fan 40 is moved. A tension that generates a force sufficient to rotate can be selectively applied.

  6 and 7 are explanatory views showing an example of the movement of the roller body 91 of the tension mechanism 90. FIG. Although illustration is omitted, it is preferable that the roller body 91 has grooves or the like corresponding to the first belt 51 and the second belt 52 formed on the outer surface thereof.

  When tension is applied to the first belt 51 using the roller body 91, that is, when the radiator fan 40 is rotated forward, the casing 102 is swung so that the roller body 91 moves downward as shown in FIG. Let On the other hand, when tension is applied to the second belt 52, that is, when the radiator fan 40 is reversed, the casing 102 is swung so that the roller body 91 moves upward as shown in FIG.

  As described above, the roller body 91 has the neutral position (FIG. 6A, FIG. 7A) where no tension is applied to either the first belt 51 or the second belt 52 by the roller movable mechanism 100, and the first position. It moves to a forward rotation position (FIG. 6C) that contacts only the first belt 51 and a reverse rotation position (FIG. 7C) that contacts only the second belt 52. Therefore, the selective switching between the first transmission path W1 and the second transmission path W2 can be reliably performed by the roller movable mechanism 100 that includes the single roller body 91 and can be configured at a low cost. In the state where the roller body 91 is in the neutral position as described above, power is not transmitted to the radiator fan 40, and the rotation of the radiator fan 40 is maintained in a stopped state.

  Note that when the roller body 91 is swung, the rotational speed of the motor 104 may be appropriately reduced. That is, since the movement of the roller body 91 is also slower than when the motor 104 is rotated at a high speed, when one of the first belt 51 or the second belt 52 starts to loosen, the tension of the other belt increases. Therefore, for example, the forwardly rotating radiator fan 40 decelerates and gradually increases in the reverse direction, so that the slip noise of the belt 51 (52) is suppressed as much as possible, and the quietness is improved. To do.

  For example, when the roller body 91 is moved from the state shown in FIG. 6 to the state shown in FIG. 7 or vice versa, when the roller body 91 is separated from the belts 51 and 52, Since a repulsive force is generated from the belts 51 and 52, the driving force of the motor 104 is assisted as a result. Therefore, with the roller movable mechanism 100 having the configuration according to the present embodiment and the embodiment, even the relatively small motor 104 can smoothly switch between the first transmission path W1 and the second transmission path W2. Can do.

<Control device 300>
Thus, on the input side of the controller (control device) 300, a main key switch 301 for starting the engine 20 and turning on / off the power supply to each part of the machine body, a potentiometer type manual operation tool 302, The potentiometer PM that detects the rotation angle of the housing 102, the water temperature sensor 303 that detects the water temperature of the radiator 30, and the exhaust temperature sensor 304 that detects the temperature of the exhaust gas discharged from the engine 20 are connected.

  On the other hand, to the output side of the controller 300, a forward relay 305 that energizes the motor 104 for forward driving and a reverse relay 306 that energizes the motor 104 for reverse driving are connected.

(Basic control)
With the above configuration, when the main key switch 301 is turned ON, the engine 20 is started, and the motor 104 is driven to the normal rotation side by the output from the controller 300 to the normal rotation relay 305, and the roller body is rotated by the rotation of the casing 102. 91 is moved to press the first belt 51, and the radiator fan 40 is driven to rotate forward via the first belt 51 (first transmission path W1). The output from the controller 300 to the forward relay 305 is stopped when the potentiometer PM detects that the housing 102 has been rotated to the first setting position, and the housing 102 is held at the first setting position. .

  When the position holding state (the forward rotation drive state of the radiator fan 30) of the housing 102 at the first set position has elapsed for 50 seconds, output from the controller 300 to the reverse relay 306 is started, and the motor 104 is driven to the reverse side. The roller body 91 is moved in the reverse direction by rotating the housing 102 in the reverse direction to release the pressure on the first belt 51 and press the second belt 52. As a result, the radiator fan 40 is driven in reverse via the second belt 52 (second transmission path W2). The output from the controller 300 to the reverse rotation relay 306 stops when the potentiometer PM detects that the casing 102 has been rotated to the second setting position, and the casing 102 is held at the second setting position.

  When the position holding state of the housing 102 at the second setting position (reverse driving state of the radiator fan 30) has elapsed for 10 seconds, the controller 300 outputs again to the forward relay 305, and the motor 104 moves forward. The radiator fan 30 is driven to rotate forward again.

  The above-described forward rotation drive for 50 seconds and reverse drive for 10 seconds of the radiator fan 30 are repeatedly performed while the main key switch 301 is ON.

(Radiator fan stop control by manual operation tool 302)
When the manual operation tool 302 is rotated to the first set position during the basic control described above, the controller 300 outputs to the reverse rotation relay 306 during the forward rotation of the radiator fan 30, while the radiator fan 30. During the reverse rotation driving, an output is made from the controller 300 to the forward rotation relay 305, the roller body 91 is moved to the neutral position by the rotation of the housing 102, and when the neutral position is detected by the potentiometer PM, The output to 306 or forward relay 305 is stopped, and the neutral position is held for 10 seconds. Thus, the rotation of the radiator fan 30 is maintained in a stopped state for 10 seconds. After the 10 seconds have elapsed, the basic control is restored.

  When the manual operation tool 302 is operated beyond the first setting position, the time for holding the roller body 91 at the neutral position, that is, the rotation of the radiator fan 40 is maintained in a stopped state according to the operation amount. The time is extended to more than 10 seconds.

  Thereby, the duration of the stop state of the fan 40 can be changed by the manual operation tool 302, and the engine coolant temperature can be adjusted to an arbitrary temperature.

(Radiator fan stop control by radiator water temperature)
During the basic control described above, when the water temperature sensor 303 detects that the water temperature of the radiator 30 is lower than the first set temperature, the time during which the roller body 91 is held at the neutral position depends on the detection result of the water temperature sensor 303. Automatically extended.

  Thereby, the lower the water temperature of the radiator 30, the longer the stop time of the fan 40, and the engine cooling water temperature can be raised to an appropriate temperature at an early stage.

  When the water temperature sensor 303 detects that the water temperature of the radiator 30 has exceeded the second set temperature that is higher than the first set temperature by a predetermined amount, the time during which the roller body 91 is held at the neutral position is The time is automatically shortened according to the difference between the detection result and the first set temperature.

(Radiator fan stop control based on exhaust gas temperature)
During the basic control described above, when the exhaust temperature sensor 304 detects that the temperature of the exhaust gas of the engine 20 is lower than the first set temperature, the time during which the roller body 91 is held at the neutral position is determined by the exhaust temperature sensor 304. It is automatically extended according to the detection result.

  As a result, the lower the temperature of the exhaust gas of the engine 20, the longer the stop time of the fan 40, and the engine coolant temperature can be raised to an appropriate temperature at an early stage.

  In addition, when the exhaust temperature sensor 304 detects that the temperature of the exhaust gas of the engine 20 has exceeded a second set temperature that is a predetermined amount higher than the first set temperature, the time during which the roller body 91 is held in the neutral position. The time is automatically shortened according to the difference between the detection result of the exhaust temperature sensor 304 and the first set temperature.

<Others>
By the way, as shown in FIG. 8, the forward rotation pulley 81 and the reverse rotation pulley 83 can be arranged on a virtual arc C centered on the rotation shaft 41 of the radiator fan 40. That is, the forward rotation pulley 81 and the reverse rotation pulley 83 are arranged at the same distance from the rotary shaft 41 of the radiator fan 40. FIG. 8 is an explanatory view showing an arrangement example of the forward rotation pulley 81 and the reverse rotation pulley 83 with respect to the rotating shaft 41 of the radiator fan 40.

  Thus, by arranging the forward rotation pulley 81 and the reverse rotation pulley 83 on the virtual arc C having the radius R from the rotation shaft 41 of the radiator fan 40, the tension in the first belt 51 and the second belt 52 is increased. The looseness and tension of the arm will not become unbalanced. Therefore, the first transmission path W <b> 1 and the second transmission path W <b> 2 (see FIG. 2) that transmit power from the engine 20 to the radiator fan 40 can be reliably switched by the single roller body 91. Further, the first belt 51 and the second belt 52 can be shared, and the cost can be reduced.

  Note that the number of radiator fans 40 shown in FIGS. 3 and 5 is seven, whereas the number of fans in the example shown in FIG. 8 is eight. That is, the number of fans of the radiator fan 40 is not particularly limited, and the size can be appropriately determined in consideration of the air blowing capability.

  Further, as shown in FIG. 2, the combine 1 according to the reference embodiment and the embodiment includes a forward rotation pulley 81 and an input pulley on one end side of the first transmission shaft 71, that is, a portion extending from the gear case 62 to the right side of the machine body. On the other hand, a helical shaft drive pulley 87 for driving the discharge spiral shaft 850 of the Glen tank 8 (see FIG. 1) is attached to the other end side, that is, a portion extending from the gear case 62 to the left side of the machine body. ing.

  As shown in FIG. 2, the power transmission path from the helical shaft drive pulley 87 to the discharge helical shaft 850 is configured as follows.

  That is, a first gear box 800 that houses a bevel gear set 801 is provided between the gear case 62 and the discharge spiral shaft 850, and a transmission pulley 88 is attached to a shaft 802 that is connected to one of the bevel gear sets 801. A third belt 53 is stretched between the helical shaft driving pulley 87 and the third shaft 53. A clutch 840 for turning on and off the tension of the third belt 53 is provided between the transmission pulley 88 and the helical shaft drive pulley 87.

  The other end of the bevel gear set 801 is connected to the base end of the vibro shaft 810, and the tip end of the vibro shaft 810 is connected to the base end of the discharge spiral shaft 850 via the second gear box 820. Note that, for example, a transmission gear group 821 in which a plurality of spur gears mesh is housed in the second gear box 820. The vibro shaft 810 is provided with a cam body 830 that strikes the bottom of the Glen tank 8.

  Thus, in the combine 1 according to the reference embodiment and the embodiment, in addition to the forward / reverse rotation of the radiator fan 40, the discharge spiral shaft 850 of the grain discharge auger 9 can be driven.

  Further, in the present reference embodiment and embodiment, an air conditioner driving pulley 89 for driving the air conditioner compressor 200 is provided on the other end side of the first transmission shaft 71 so as to be adjacent to the helical shaft driving pulley 87. Provided. A fourth belt 54 is stretched between the air conditioner driving pulley 89 and the air conditioner passive pulley 210 linked to the compressor 200. In addition, the helical shaft drive pulley 87 and the air conditioner drive pulley 89 in the present reference embodiment and the embodiment are integrally configured by a double pulley as described later (see FIG. 9).

  Therefore, in the combine 1 according to the reference embodiment and the embodiment, the simple configuration with the gear case 62 is provided, so that the forward rotation / reverse rotation of the radiator fan 40 and the grain discharge auger 9 are suppressed while suppressing an increase in cost. In addition to driving the discharge spiral shaft 850, it is also possible to drive the compressor 200 for the air conditioner.

  Here, the configuration of the gear case 62 included in the power switching mechanism 60 described above will be described with reference to FIGS. 9 and 10. FIG. 9 is a side view of the gear case 62, and FIG. 10 is an explanatory view of the gear case 62 shown in FIG.

  As shown in the drawing, the gear case 62 is formed with a flange 621 for attachment to the machine body at the base, and an oval case main body 622 extending obliquely upward from the base at an angle of about 45 °.

  As shown in FIG. 10, the case main body 622 has a first shaft accommodating portion 623 that accommodates a relatively short first transmission shaft 71 bulging at the lower portion of the case and is relatively long. A second shaft housing portion 624 that houses the second transmission shaft 72 is formed to bulge in the upper part of the case. A pair of gears 61 and 61, which are spur gears that mesh with each other, are housed on the side of the case body 622 that is close to the helical shaft driving pulley 87 and the air conditioner driving pulley 89.

  By adopting the gear case 62 having such a configuration in the power switching mechanism 60, switching between the first transmission path W1 and the second transmission path W2 is facilitated, and the forward or reverse rotation of the radiator fan 40 is selectively performed. However, the driving of the discharge spiral shaft 850 and the driving of the air conditioner can be performed with a simple configuration.

<Modification>
In the above-described embodiments, the pulleys for configuring the first transmission path W1 and the second transmission path W2 are configured to use independent pulleys. However, for example, as shown in FIG. 11, a double pulley 860 can be used instead of the forward pulley 81 and the input pulley 82 provided in parallel with the first transmission shaft 71 provided in the gear case 62. FIG. 11 is a schematic explanatory view showing a modification of the pulley provided in the power switching mechanism 60.

  Further, instead of the forward pulley 85 and the reverse pulley 86 provided on the rotating shaft 41 of the radiator fan 40, a double pulley 870 can also be used.

  Thus, by using the double pulley 860 (870), the number of parts can be reduced and the cost can be reduced.

  In the reference embodiment described above, the forward rotation pulley 85 and the reverse rotation pulley 86 have the same diameter, but they need not necessarily have the same diameter.

  In the reference embodiment described above, the pair of gears 61 and 61 housed in the gear case 62 are spur gears, but other types of gears may be used. For example, when the extending directions of the first transmission shaft 71 and the second transmission shaft 72 are not parallel, a bevel gear or the like may be used.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

10a Cover 20 Engine 30 Radiator 40 Radiator fan (fan)
60 Power switching mechanism 302 Manual operating tool W1 First transmission path W2 Second transmission path

Claims (5)

  A radiator (30) is disposed outside the engine (20), a cover (10a) having a dust filtering function is disposed outside the radiator (30), and the engine (20) is disposed between the radiator (30) and the radiator (30). A first transmission path for transmitting the driving force of the engine (20) to the fan (40) to drive the fan (40) in the normal direction in a driving part of a work vehicle in which a single fan (40) is arranged. (W1), a second transmission path (W2) for transmitting the driving force of the engine (20) to the fan (40) to drive the fan (40) in the reverse direction, and the first transmission path (W1) ) From the second transmission path (W2) to the fan (40) and the power switching mechanism (60) for switching the driving force from the second transmission path (W2) to the fan (40). (60) to control A work vehicle characterized in that a fan stop state in which no driving force is transmitted to the fan (40) from either the first transmission path (W1) or the second transmission path (W2) can be revealed. Prime mover.   The driving | running | working part of the working vehicle of Claim 1 made it the structure which can change the continuation time of the said fan stop state.   The driving | running | working part of the work vehicle of Claim 2 which provided the manual operation tool (302) which changes the continuation time of the said fan stop state.   The both motive parts of the work vehicle according to claim 2, wherein the duration of the fan stop state is changed according to the water temperature of the radiator (30).   The driving | running | working part of the work vehicle of Claim 2 made into the structure changed according to the exhaust temperature of the said engine (20).

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