JP2000142141A - Transmission of rice transplanter for riding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the machine body of a rice transplanter more compact by arranging the pump shaft of a pump in the machine body longitudinal direction, and interlocking and connecting it to the output shaft of an engine arranged in the machine body longitudinal direction through an endless body. SOLUTION: An opening for integrating a hydraulic pump 40 is provided on the front of a side case 33, and blocked by a pump cover 36. The pump shaft 26 of the hydraulic pump 40 is longitudinally erected and rotatably supported between the pump cover 36 and a center section 37, the front end of the pump shaft 26 is protruded forward over the pump cover 36, and an input pulley 26p is fixed to the tip thereof. On the other hand, the output shaft 9a of an engine 9 is situated substantially in the lateral center of a machine body in a plan view so as to have a relation that it is offset substantially in parallel to the pump shaft 26, and an output pulley is fixed to the tip thereof. A belt 18 that is an endless body is wound around the output pulley 9p and the input pulley 26p to interlock and connect both the shafts 9a, 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission for a rice transplanter, and more particularly to a technique for compactly transmitting a power from an engine to an input shaft of the transmission.

[0002]

2. Description of the Related Art Conventionally, the technology of a transmission of a riding rice transplanter having a hydrostatic continuously variable transmission (hereinafter abbreviated as "HST device") and performing continuously variable transmission by the device has been known. ing. In this transmission, the output of the engine is input from the pump shaft of a hydraulic pump constituting the HST device, the main transmission is performed, and then the sub transmission is performed in the transmission case.
It is configured to transmit to the shaft.

[0003] In a riding rice transplanter equipped with the above-mentioned transmission, an engine is arranged on the front of the body frame, a transmission case is arranged in the center of the body frame, and a front axle case is supported by the front of the body frame. The rear axle case is fixed to the rear part of the body frame, and both axle cases extend downward from both sides to project the axle from the lower part thereof to support and drive the front wheel or the rear wheel. Further, a PTO shaft is projected from a rear portion of the transmission case, and power is transmitted to the planting portion via a universal joint, a transmission shaft, or the like.

[0004] As described above, the transmission case has an HST.
A device is arranged, and a pump shaft of a hydraulic pump constituting the HST device is arranged in a lateral direction of a machine body, and is connected to a crankshaft of an engine also arranged in a lateral direction of the machine by a belt.

[0005]

However, the conventional transmission as described above transmits power from a transmission case to a front axle and a rear axle via a front axle case, a rear axle case, a transmission case and the like. However, the number of parts and the number of assembling man-hours have increased, resulting in an increase in cost. Further, in addition to these transmission systems, a rigid body is formed by the body frame to support the body, so that it is difficult to make the body compact and the structure is large.

In order to solve such a problem, for example, the front axle and the rear axle are arranged at the front and rear of the transmission case, and the transmission case is integrally formed with the front or rear axle case. In addition, there is a conceivable method in which the traveling power transmission system and the work power transmission system conventionally housed in separate cases are housed in a transmission case to be integrated so as to be compact. Also,
The pump shaft of the HST device, which is the input shaft on the transmission case side, is disposed in the longitudinal direction of the fuselage, and the output shaft of the engine is disposed substantially on the same axis as the pump shaft. As a configuration, a method in which the distance between the two axes is reduced to make the body compact in the front-rear direction can be considered. These methods described above are considered to be useful from the viewpoint of making the body of the rice transplanter compact and simplifying the configuration.

However, if the output shaft of the engine and the input shaft of the transmission case are arranged on substantially the same axis and connected by a universal joint, the output shaft of the engine and the input shaft on the transmission case side will have If a universal joint must be arranged with a certain distance between them and a clutch (for example, a single-plate clutch) is provided to control the transmission of rotation of both shafts, the Space is required. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmission that can make a body of a rice transplanter more compact.

[0008]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. In the first aspect, a hydrostatic stepless transmission (hereinafter referred to as "HS") is provided on a side wall portion of the transmission case.
T device ”. ), The pump shaft of the hydraulic pump of the HST device is arranged in the longitudinal direction of the fuselage, and the output shaft of the engine arranged in the longitudinal direction of the fuselage is operatively connected via an endless body.

According to a second aspect of the present invention, the endless body is constituted by a belt and includes a tension clutch linked to clutch operating means.

[0010]

Next, embodiments of the present invention will be described. First, the overall configuration of a riding rice transplanter will be described with reference to FIG. FIG. 1 is a side view showing an overall configuration of a riding rice transplanter having a transmission according to one embodiment of the present invention. That is, this rice transplanter comprises a front running section 1 and a planting section 2 disposed at the rear. The running section 1 has an engine 9 mounted on a front section of a body frame 10, and the engine 9 is controlled by a bonnet 3. The output shaft 9a of the engine 9 is covered and protrudes rearward of the fuselage, and the steering handle 4 is disposed above the handle post 5 disposed on the rear upper surface of the bonnet 3. The body frame 10 is covered with a body cover 6, and a seat 7 is disposed thereon. The body cover 6 and the steps 8 on both sides of the hood 3 and the front part of the seat 7 are integrally formed of synthetic resin.

The transmission case 11 of the present invention is mounted on the body frame 10 from the lower front and rear center of the body frame 10.
It extends to the lower rear, and is arranged at the front high and rear low in a side view, and is formed long in the front-rear direction. The front axle 79 protrudes from the front axle cases 12 and 12 provided on the front left and right sides of the transmission case 11, and the front wheels 13 and 13.
The rear axle 99 protrudes from the rear part of the transmission case 11 to the left and right sides to support the rear wheels 15.

The planting section 2 is mounted on the rear section of the traveling section 1 via a hydraulic lifting device 17 so as to be able to ascend and descend to the ground. A supporting frame connected between the rear section of the body frame 10 and the rear section of the transmission case 11 is provided. 16 is a hydraulic lifting device 17
Of the hydraulic lifting device 1
7 between the front of the body and the fuselage frame 10
9 is interposed, and the planting section 2 can be moved up and down by operating the hydraulic cylinder 19 to expand and contract.

The planting section 2 disposed at the rear of the hydraulic lifting device 17 is mounted on a planting case 20 in a conventional manner.
Are arranged so as to be able to reciprocate left and right, a float 22 is hung below, a transmission case 23 projects from the rear, and a planting claw 24 is attached to the transmission case 23 via a crank mechanism.

Power is transmitted to the planting case 20 via a universal joint, a transmission shaft, and the like to a PTO shaft 25 projecting rearward from the front of the transmission case 11, and the seedling mounting table 21 and the planting claws 24 are transmitted. Is driven, the seedlings are taken out from the seedling mounting table 21 by the planting claws 24 while running, and the seedling planting operation is continuously performed.

Next, the structure of the transmission of the present invention will be described with reference to FIGS. FIG. 2 is a plan cross-sectional development view of the transmission, FIG. 3 is a plan cross-sectional view of the transmission including a pump shaft and a motor shaft of the HST device, and FIG. 4 is a front view showing a power transmission configuration from an engine to the transmission. 5 is a right side sectional view showing the structure of the transmission system at the front of the transmission, FIG. 6 is a front sectional view showing the structure of the right front axle case, and FIG. 7 shows the structure of the transmission system at the rear of the transmission. FIG. 8 is a right side sectional view of the same transmission, and FIG. 9 is a right side sectional view showing a configuration of a first transmission accommodating portion of the transmission.

That is, as shown in FIGS. 2 and 3, the transmission case 11 for accommodating the transmission is constituted by half-type case halves 11L and 11R which can be separated from each other. An HST device 31 serving as a main transmission is attached to one side of the front side of the transmission case 11 (the left side in this embodiment). The HST device 31 includes a variable displacement hydraulic pump 40, a fixed displacement hydraulic motor 41, and a center section 37. The center section 37 is formed in an L-shape in plan view. Is mounted with a hydraulic pump 40, a hydraulic motor 41 is mounted on a side surface, and the side portion is the side case 33.
Installed with multiple bolts inside. The side case 3
An opening for incorporating the center section 37 is provided on one side surface of the device 3 and is closed by the cover plate 34. The HST device 31 thus configured is attached to the left case half 11L via the cover plate 34.

A hydraulic pump 4 is provided on the front of the side case 33.
An opening is provided for incorporating a zero and the pump cover 36 is closed. The pump shaft 26 of the hydraulic pump 40 is provided between the pump cover 36 and the center section 37 in the front-rear direction and is rotatably supported.
The front end of 6 protrudes forward from the pump cover 36, and an input pulley 26p is fixed to the end thereof. On the other hand, the output shaft 9a of the engine 9 is located substantially on the center when viewed in the horizontal direction of the plane body, and is offset substantially parallel to the pump shaft 26. 9p is fixed. And the output pulley 9
p and the input pulley 26p have an endless belt 1
8, the two shafts 9a and 26 are interlockingly connected. As shown in FIG. 4, an arm 29 supported so as to be tiltable is disposed near the belt 18 and a tension pulley 28 is pivotally supported at an end of the arm 29 to constitute a tension clutch. . One end of the arm is a wire 28
The arm 29 is tilted by operating the clutch operating means, and the belt 18 is tensioned / relaxed.

As shown in FIGS. 2 and 3, the HST device 31 has a pump mounting surface 3 on the front of the center section 37.
7a, and a motor attachment surface 37b is formed on the side surface of the center section 37. The configuration of the HST device 31 is as follows. That is, the center section 37
And the pump shaft 2 rotatably supported by the pump cover 36
6, the rotation axis of the cylinder block 42 is locked so as to be relatively non-rotatable, and is rotatably slidably mounted on the pump mounting surface 37a. Pistons 43 are provided in a plurality of cylinder holes of the cylinder block 42 through urging springs.
Are fitted reciprocally, and the pistons 43
.. Are the thrust bearings 44 of the movable swash plate 44.
a, and the pump shaft 26 penetrates the center of the movable swash plate 44. Thus, the axial piston type hydraulic pump 40 is configured.

A trunnion shaft 39 is protruded from an appropriate position of the side case 33 (in this embodiment, an outer wall portion of the machine body), and a transmission arm 38 fixed to an outer end of the trunnion shaft 39 is rotated. By doing so, the movable swash plate 44 can be tilted. The transmission arm 38 is connected to a transmission lever near the driver's seat via a link or the like. Therefore, the amount and direction of oil discharge from the hydraulic pump 40 can be changed by tilting the piston contact surface of the movable swash plate 44 with respect to the rotation axis of the cylinder block 42 by operating the shift lever.

The rotation axis of the cylinder block 52 is locked on the motor shaft 27 rotatably mounted between the center section 37 and the side case 33 so as to be relatively non-rotatable. It is installed on the surface 37b so as to be freely slidable. In a plurality of cylinder holes of the cylinder block 52, pistons 53, 53,.
Are reciprocally fitted, and the pistons 53, 53,.
Is in contact with the thrust bearing 54a of the fixed swash plate 54, and the motor shaft 27 passes through the center of the fixed swash plate 54. Thus, the axial piston type hydraulic motor 41 is configured.

The oil supply / discharge ports of the hydraulic pump 40 and the hydraulic motor 41 are fluidly connected by a pair of L-shaped oil passages (not shown) provided inside the center section 37 to form a closed circuit. When the power of the engine 9 is input to the pump shaft 26, the hydraulic pump 40 is driven, and sends hydraulic oil to the hydraulic motor 41. At this time, the movable swash plate 4
The rotation direction and the number of rotations of the hydraulic motor 41 can be changed steplessly by tilting the 4, and thus the HST device 31 is configured.

One end of the motor shaft 27 penetrates through the center section 37 and the cover plate 34 and penetrates into the transmission gear housing from the case half 11R.
Is fixed. In the transmission case 11, the transmission shaft 35, the final shaft 60, the front wheel drive shafts 71L and 71R, and the PTO as shown in FIGS.
Transmission system first counter shaft 61 and second counter shaft 6
2 are arranged in parallel, and at the rear, as shown in FIGS. 7 and 8, the side clutch shaft 97, the reduction shaft 98, and the rear axle 9
9L and 99R are laid in parallel. The transmission shaft 35
A transmission gear 45 meshing with the input gear 30 is fixedly mounted on the transmission gear 35 and transmits the rotation of the motor shaft 27 to the transmission shaft 35.

The front part of the right case half 11R on the opposite side where the HST device 31 is disposed has a case swelled to the right to form a swelling portion 11a, and a second transmission, which is a sub-transmission, is formed in the swelling portion 11a. The second transmission 32 is housed. And
Power is transmitted to the traveling transmission system through the second transmission 32 as shown in FIGS. That is, a large-diameter gear 67 and a small-diameter gear 68 are fixedly mounted on the transmission shaft 35, and a final shaft 60 is suspended parallel to the transmission shaft 35 and behind the transmission case 11 behind the transmission shaft 35. Above is a double transmission gear 6 that can mesh with the gears 67 and 68.
3 is spline-fitted slidably in the axial direction, and an output sprocket 65 and an output gear 66 are fixedly provided.

The speed change gear 63 can be slid left and right by operating a sub speed change lever provided on the side of the seat 7. By this slide, the gear 63 is engaged with either the large diameter gear 67 or the small diameter gear 68. High-low two-stage variable speed rotation can be obtained on the final shaft 60. The output gear 66 is always meshed with an input gear 70 of a differential gear device 69 disposed below the final shaft 60, and the differential gear device 69 differentially couples the left and right front wheel drive shafts 71L and 71R. . An unillustrated differential lock device is arranged on the left front wheel drive shaft 71L.

Then, as shown in FIG. 6, front wheel drive shafts 71L and 71L are mounted on the left and right outer end faces of the transmission case.
A bevel gear 73 is supported in the front axle case 12 accommodating the R and is connected to the ends of the front wheel drive shafts 71L and 71R. Also, the front axle case 12
Inside, a kingpin shaft 75 is supported so as to extend substantially in the vertical direction and protrudes downward. The lower portion of the kingpin shaft 75 extends and is pivotally supported in the rotating case 76, and the upper end of the kingpin shaft 75 A bevel gear 74 is fixedly engaged with the bevel gear 73, a bevel gear 77 is fixedly provided at the lower end of the kingpin shaft 75, and a bevel gear 78 fixedly attached to the front axles 79L and 79R suspended below the rotating case 76. Are engaged. The front wheel 13 is attached to the outer end of the front axle 79L / 79R.
Is fixed, and power is transmitted from the differential gear device 69.

A knuckle arm (not shown) is fixedly mounted on the upper surface of the rotating case 76. The knuckle arm is interlocked with the steering handle 4 via a tie rod (not shown). By turning, the front wheels 13 can be steered left and right.

Next, the power transmission configuration of the work transmission system will be described. A first counter shaft 61 and a second counter shaft 62 are rotatable to the right case half 11R in front and rear parallel to the rear of the final shaft 60 in the bulging portion 11a as shown in FIGS. , And a gear 81 is integrally formed on the first counter shaft 61. The gear 8
1 meshes with a PTO transmission gear 64 fixed on the transmission shaft 35.

The first counter shaft 61 protrudes outward from the right side surface of the right case half 11R, and a gear 82 for inter-stock transmission is removably fixed. The gear 82 is mounted on the second counter shaft 62. The gear 82 meshes with a detachably fixed gear 83, and the gears 82 are covered by a cover attached to the left side surface of the left case half 11L. A bevel gear 84 is provided in the transmission case 11 of the second counter shaft 62.
Are fixedly engaged with a bevel gear 85 fixed on the PTO clutch shaft 86.

The PTO clutch shaft 86 is traversed in the front-rear direction at the mating surface of the left and right case halves 11L and 11R, and at the rear end of the PTO clutch shaft 86 on the same axis.
The TO shaft 25 is rotatably arranged. A PTO clutch 90 is provided between the PTO clutch shaft 86 and the PTO shaft 25.
And a torque limiter 91. The PTO clutch 90 has a clutch claw 92 fixedly provided on a front portion of a PTO clutch shaft 86, a hollow shaft 93 being rotatably fitted on a rear portion thereof, and a sliding claw 94 sliding on the hollow shaft 93 in the axial direction. The clutch pawls 92 are movably fitted with splines so as to be disengageable from the clutch claws 92. The sliding claw 94 is slid by rotating a PTO operation shaft 95 pivotally supported on the left side surface of the left case half 11L. The PTO operation shaft 95 is connected to the side of the seat 7 via a link, a wire, or the like. By setting the planting operation lever to the “in” position, the sliding claws 94 are engaged with the clutch claws 92 to drive the planting section 2.

A pawl clutch type torque limiter 91 is disposed between the rear portion of the hollow shaft 93 and the PTO shaft 25, and the PTO shaft 25 is connected via the torque limiter 91.
When the overload is applied to the planting portion 2 side, the torque limiter 91 is configured to idle and prevent the transmission components from being damaged. 91a is a spring for setting a limit torque. As shown in FIG. 5, the PTO shaft 25 projects rearward from the bulging portion 11a at the upper front of the transmission case 11, and is configured to transmit power to the planting portion 2 via a universal joint or a transmission shaft. .

Next, the structure for transmitting power to the rear wheels will be described. As shown in FIGS. 7 and 8, a side clutch shaft 97, a reduction shaft 98, and rear axles 99 </ b> L and 99 </ b> R are supported at the rear of the transmission case 11 in a freely rotatable manner in parallel.
A sprocket 100 is fixed at the center in the left-right direction of the side clutch shaft 97, and a chain 101 is wound between the sprocket 100 and the output sprocket 65 fixed on the final shaft 60, so that power is transmitted to the rear wheel 15. To be communicated.

Side gears 102L and 102R are rotatably and slidably fitted on both sides of the sprocket 100 on the side clutch shaft 97 so as to be meshable with internal teeth 100a and 100a provided on both sides of the sprocket 100. 111L and 111R are configured.
A friction plate is locked and superimposed on each of the side gears 102L and 102R and the left and right case halves 11L and 11R, and a flange-like pressing body is formed on the outer periphery of the side gears 102L and 102R to form a side brake. 103L ・ 1
03R is configured. Side gear 102L ・ 102
The side clutch arms 104L and 104R are disposed in the vicinity of R.
Arm supporting shafts 108L and 108R that support one end of the transmission case are rotatably supported in the vertical direction of the transmission case. Fixed,
The arm is operatively connected to left and right side brake pedals provided on the step 8 of the driving unit via a wire link or the like. Therefore, by depressing the side brake pedal inside the turn, the side clutch arm 104 on that side is depressed.
Is tilted to slide on the side gear 102, the side clutch 111 on that side is disengaged to cut off the driving force of the rear wheel on the inside of the turn, and furthermore, the side brake 103L or 103R is braked to enable a sharp turn. .

Further, the side gears 102L and 102R
Has two reduction gears 105L fixed on the reduction shaft 98.
105R. The reduction gear 105L
The small-diameter gear 105R meshes with gears 107L and 107R fixed on the inner ends of the rear axles 99L and 99R, and the rear wheels 15 and 15 are mounted on the outer ends of the rear axles 99L and 99R. The rear wheels 15
Since it is mounted on the rear axles 99L and 99R protruding from both sides of the rear part, a rear axle case for accommodating the reduction gear is unnecessary, and a compact configuration can be achieved. In this way, the motive power after being shifted by the HST device 31 and the second transmission device 32 is output by the output sprocket 65, the chain 101, the sprocket 100, and the side clutch 111L.
Power is transmitted to the rear axle 99 via the 111R and the side brakes 103L and 103R, and the rear wheel 15 is driven.

Next, the flow of lubricating oil in the transmission will be described. That is, the section formed by the left and right case halves 11L and 11R is filled with lubricating oil to lubricate the gear train of the transmission system disposed therein, and the lubricating oil is an oil filter indicated by reference numeral 46 in FIG. After passing through the outside of the transmission case 11 and passing through a pipe (not shown), it is guided to the hydraulic lifting / lowering device 17 of the planting portion, and serves as hydraulic oil for the hydraulic lifting / lowering device 17. On the other hand, H
At an appropriate position (the rear part in the present embodiment) of the side case 33 that houses the ST device 31, an inflow pipe 47 is protrudingly provided as shown in FIG. The inflow pipe 47 is connected to the above-mentioned hydraulic elevating device 17 via a pipe (not shown).
Return oil from the side case 3
3. It is introduced into a closed section constituted by the cover plate 34 and the pump cover 36.

A part of the lubricating oil which has flowed into the above-mentioned section is filtered and fixed between the surface of the center section 37 opposite to the motor mounting surface and the inner surface of the cover plate 34 (FIGS. 2 and 3). After passing through (46) shown in the figure, it is guided to a circuit in the HST device 31, and plays a role as a replenishing oil for operating the HST device 31. Then, the lubricating oil overflowing the specified amount in the section is discharged from the discharge pipe 48 protruding above the side case 33 and formed by the left and right case halves 11L and 11R via a pipe (not shown). Returned to parcel.

Next, a second configuration example of the transmission will be described with reference to FIG. FIG. 10 is a plan sectional view showing a second configuration example of the transmission. As shown in FIG. 10, the second configuration example 11 'is a configuration example of the transmission described above (hereinafter, referred to as a "first configuration example").
11 in the following points. That is, the hydraulic motor 41 of the HST device 31a is arranged in a direction opposite to the direction of the hydraulic motor 41 of the first configuration example 11, and the outer side surface of the case half 11L of the transmission case does not pass through the cover plate 34. The side case 33 'is directly attached. Further, an opening is provided outside the body of the side case 33 ', and a cover plate 50 is fixedly provided to close the opening. The configuration of the other parts of the transmission 11 'of the second configuration example is exactly the same as that of the first configuration example 11 described above.

Further, a third configuration example of the transmission will be described with reference to FIGS. FIG. 11 is a plan sectional view showing a third configuration example of the transmission, and FIG. 12 is a left side sectional view showing the configuration of the first transmission housing portion in the third configuration example of the transmission. As shown in FIG. 11, this third configuration example 11 ″
Differs from the first configuration example 11 in the following points. That is, instead of providing the side case 33, the front outer side wall of the left case half 11L 'of the transmission case is bulged to the left to form a second bulge 11b.
The T device 31b is housed and integrated. Also, H
A bearing plate 34 'is mounted on the surface of the center section 37 of the ST device 31b opposite to the motor mounting surface, and the motor shaft 27 and the transmission shaft 35 of the hydraulic motor are rotatably supported by the bearing plate 34'. And The hydraulic pump 40 is housed in the transmission case 11 through a hole opened in the front wall of the left case half 11L ', and the pump shaft 26 is supported by the front surface of the center section 37 and the pump cover 36. The hydraulic motor 41 is disposed between the inner surface of the left case half 11L 'and the side surface of the center section 37.

The third configuration example 11 ″ is an HST device 3
Since the 1b storage portion is not a closed section, replenishing oil cannot be stored in the storage portion. Therefore, HS in this case
The replenishment of the replenishing oil to the T device 31b is performed as follows. That is, as shown in FIGS. 11 and 12,
A small closed section 49 is formed at the joint between the side of the center section 37 and the bearing plate 34 ', and an appropriate position of the second bulging portion 11b of the left case half 11L' (upper portion in this configuration example). Is connected to the inside of the closed section 49 via a conduit 49a.

Therefore, after the lubricating oil in the transmission system housing portion of the transmission case is guided to the hydraulic lifting device 17 and used as hydraulic oil, the return oil from the hydraulic lifting device 17 is
The pipe (not shown) and the inflow pipe 47 'are introduced into the closed section 49 via a conduit 49a. After passing through the filter 46 disposed in the closed section 49, the lubricating oil is guided to a closed circuit in the HST device 31b,
Plays a role as a replenishing oil for operation. Then, the leaked oil of the closed circuit leaked from the hydraulic pump mounting surface 37a, the hydraulic motor mounting surface 37b, and the like passes through the inside of the transmission case and is returned to the oil sump in the transmission system housing portion. The configuration of the other parts in the transmission 11 "of the third configuration example is exactly the same as that of the first configuration example 11 described above.

[0040]

The present invention is configured as described above.
The following effects are obtained. That is, a hydrostatic stepless transmission (hereinafter abbreviated as "HST device") is attached to a side wall portion of a transmission case, and a pump shaft of a hydraulic pump of the HST device is disposed in a longitudinal direction of the machine body. And, since the output shaft of the engine arranged in the longitudinal direction of the fuselage and the output shaft of the engine and the pump shaft of the hydraulic pump arranged in parallel with the longitudinal direction of the fuselage in particular, 3, the width A of the connecting portion in the front-rear direction can be reduced as shown in FIG. 3, and the body can be downsized (especially in the front-rear direction). . Accordingly, it is possible to provide a transmission capable of improving the compactness of the riding rice transplanter.

According to a second aspect of the present invention, since the endless body is formed of a belt and includes a tension clutch linked to clutch operating means, the tension pulley is also arranged in the lateral direction of the machine along with the belt. The structure can also be provided with a clutch without increasing the width A in the front-rear direction, and as a result, a more compact transmission can be provided by effective use of space.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of a riding rice transplanter provided with a transmission according to one embodiment of the present invention.

FIG. 2 is a developed plan sectional view of the transmission.

FIG. 3 is a plan sectional view of the transmission including a pump shaft and a motor shaft of the HST device.

FIG. 4 is a front view showing a power transmission configuration from the engine to the transmission.

FIG. 5 is a right side sectional view showing the configuration of a transmission system at the front of the transmission.

FIG. 6 is a front sectional view showing a configuration of a right front axle case.

FIG. 7 is a plan sectional view showing the configuration of the transmission system at the rear of the transmission.

FIG. 8 is a right side sectional view of the same.

FIG. 9 is a right side sectional view showing a configuration of a first transmission housing portion of the transmission.

FIG. 10 is a plan sectional view showing a second configuration example of the transmission.

FIG. 11 is a plan sectional view showing a third configuration example of the transmission.

FIG. 12 is a left side sectional view showing a configuration of a first transmission accommodating portion in a third configuration example of the transmission.

[Explanation of symbols]

 9 Engine 9a Output shaft 11 Transmission case 18 Belt 26 Pump shaft 28 Tension pulley 29 Arm 31 HST device 40 Hydraulic pump 41 Hydraulic motor

Claims (2)

[Claims] 1. A hydrostatic stepless transmission (hereinafter, abbreviated as "HST device") is attached to a side wall portion of a transmission case, and a pump shaft of a hydraulic pump of the HST device is disposed in a longitudinal direction of the body, and A transmission for a riding rice transplanter, wherein the transmission is interlocked with an output shaft of an engine arranged in a direction through an endless body. 2. The endless body is constituted by a belt, and
The transmission of a riding rice transplanter according to claim 1, further comprising a tension clutch linked to the clutch operating means.