JPH11208296A - Transmission for riding rice-planting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a transmission structure, and reduce cost and power loss by shortening a distance between an output shaft and a pump shaft. SOLUTION: In this rice-planting machine, an engine 9 is mounted on a front top of a machine frame 10, and a transmission case 11 (11L, 11R) is formed in a shape that a length in the longitudinal directions is larger and is arranged at lower portion of the machine frame. A front axle 79 (79L, 79R) and a rear axle 99 (99L, 99R) are attached to the front and rear of the transmission case 11 (11L, 11R), respectively, to support it. A static hydraulic continuously variable transmission unit is arranged at the front of the transmission case 11 (11L, 11R). A hydraulic pump 40 configuring the static hydraulic continuously variable transmission unit is installed on the front face of the front and rear of the transmission case 11 (11L, 11R). The pump shaft 26 of the hydraulic pump 40 is placed so that its axis of rotation is along the longitudinal directions of the machine unit, and is connected to the output shaft of the engine. A hydraulic motor 41 configuring the static hydraulic continuously variable transmission unit is installed at the side face of the transmission case 11 (11L, 11R), and axis of rotation of the hydraulic motor 41 and of the hydraulic pump 40 are arranged to cross at right angle.

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 transmission case in which transmission means for transmitting power from an engine to left and right front axles and right and left rear axles for transmission. To make the configuration compact.

[0002]

2. Description of the Related Art In a conventional riding rice transplanter, an engine is arranged on a front portion of an airframe, a transmission case is arranged in the center of the airframe, and a front axle case is supported by a front portion of the airframe. The front axle case is configured to extend downward from both ends and project the front axle from below to support and drive the front wheels. A rear axle case is fixedly provided on both sides of the rear of the transmission case, and the rear axle case projects a transmission pipe outward from both side surfaces of the transmission case, and projects a transmission chain case rearward and downward from its end. The rear axle is rotatably supported at the rear of the transmission chain case, and the rear axle supports and drives the rear wheel. Further, the PTO shaft protrudes from the rear of the transmission case, and transmits power to the planting portion via a universal joint or a transmission shaft.

[0003]

In order to transmit the driving force of the rice transplanter as described above, power is transmitted from the transmission case to the wheels via the front axle case, the rear axle case, the transmission case and the like. As a result, the number of parts was large, the number of assembly steps was increased, and the cost was increased. 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.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in claim 1, the engine is mounted on the front part of the body frame, and a transmission case formed long in the front-rear direction is arranged below the body frame,
A front axle is mounted at a front portion of the transmission case, and a rear axle is mounted and supported at a rear portion, and a hydrostatic continuously variable transmission is disposed at a front portion of the transmission case. Is mounted on the front of the transmission case, and the rotation axis of the pump shaft of the hydraulic pump is positioned along the longitudinal direction of the vehicle, and is connected to the output shaft of the engine.

According to a second aspect of the present invention, a hydraulic motor constituting the hydrostatic stepless transmission is installed on a side of a transmission case, and a rotation axis of the hydraulic motor and a rotation axis of the hydraulic pump are arranged orthogonally. .

[0006]

Next, an embodiment of the present invention will be described. 1 is an overall side view of a riding rice transplanter equipped with the transmission of the present invention, FIG. 2 is a plan view of the transmission and some wheels, FIG. 3 is a cross-sectional plan view of a transmission case, and FIG. FIG. 5 is a side cross-sectional view of the front of the transmission case, FIG. 6 is an exploded cross-sectional view of the front of the transmission case and a cross-sectional view of the front axle case on one side, and FIG. FIG. 8 is an expanded sectional view, FIG. 8 is a plan sectional view of the first transmission, and FIG.
FIG. 5 is a planar development sectional view of a rear part of the transmission case.

First, the overall structure of a riding rice transplanter will be described with reference to FIG. The rice transplanter comprises a front running section 1 and a planting section 2 arranged at the rear. The running section 1 has an engine 9 mounted on a front portion of a body frame 10, and the engine 9 is covered by a bonnet 3. The output shaft of the engine 9 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 constructed such that the lower part of the body frame
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. Front axles 79L and 79R protrude from front axle cases 12 and 12 provided on the front left and right sides of the transmission case 11, and front wheels 13 and 13 are supported. Rear axles 99L and 99R are provided on the left and right sides from the rear of the transmission case 11. To support the rear wheels 15.

The planting section 2 is mounted on the rear 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 of the body frame 10 and the rear 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 mounted on the rear of the hydraulic lifting device 17 is mounted on a planting case 20 in a usual 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 protruding 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. The transmission case 11 for accommodating the transmission includes left and right halved case halves 11L and 11R that can be separated from each other.
A first transmission 31 serving as a main transmission is attached to a front end portion of the transmission case 11. The first transmission 31 includes a variable displacement hydraulic pump 40 and a fixed displacement hydraulic motor 41.
And a hydrostatic stepless transmission comprising a center section 37, and the center section 37 is a top view L
The transmission case 11 is fixed to the front of the transmission case 11. A hydraulic pump 40 is mounted on a front outer surface of the center section 37, an inner side surface is fixed to an outer wall of the case half 11R, and a hydraulic motor 41 is mounted on the outer surface. Reference numeral 137 denotes an attachment stay attached to the outer wall of the case half 11L, and supports a front portion of the center section 37.

A pump shaft 26 of the hydraulic pump 40 is rotatably supported in the front-rear direction between a pump case 36 and a center section 37, and a front end of the pump shaft 26 projects forward from the pump case 36 to form a universal joint. And is interlocked with the output shaft of the engine 9.
By arranging the pump shaft 26 in the front-rear direction, the distance between the pump 9 and the engine 9 is shortened, the pump shaft 26 can be compactly configured, and power loss can be suppressed by aligning the pump shaft 26 with the output shaft of the engine 9. Can be. However, the output shaft of the engine may be offset parallel to the rotation axis of the pump shaft 26, and pulleys may be fixed on each shaft to transmit power via a belt.

As shown in FIGS. 7 and 8, the first transmission 31 is a hydrostatic stepless transmission, and has a pump mounting surface 37a formed on the front of the center section 37, and is provided on the side of the center section 37. A motor attachment surface 37b is formed. The center section 37 and the pump case 36
The rotation axis of the cylinder block 42 is locked and non-rotatably mounted on the pump shaft 26 rotatably supported on the pump shaft 26, and is rotatably slidably disposed on the pump mounting surface 37a. . A plurality of 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
..The head of the thrust bearing 44a of the movable swash plate 44
, And the pump shaft 26 penetrates the center of the movable swash plate 44. Thus, the axial piston type hydraulic pump 40 is configured.

On both left and right sides of the movable swash plate 44, trunnion shafts 39 are protruded, and the movable swash plate 44 is tilted by rotating a transmission arm 38 fixed to the outer end of the case of one of the trunnion shafts. The transmission arm 38 is connected to a transmission lever near the driver's seat via a link or the like.
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.

A motor shaft 27 rotatably mounted between the center section 37 and the motor case 33.
The rotation axis of the cylinder block 52 is locked so as not to rotate relative to the cylinder block 52 and is integrally disposed thereon.
b is arranged to be rotatable and slidable. Are reciprocally fitted into the plurality of cylinder holes of the cylinder block 52 via urging springs, and the heads of the pistons 53 are fixed swash plates 54. The fixed swash plate 54 has a center through which the motor shaft 27 passes. Thus, the axial piston type hydraulic motor 41 is configured.

The hydraulic pump 40 and the hydraulic motor 41 are connected to a L section provided inside a center section 37 (not shown).
A fluid is connected by a V-shaped oil passage (not shown) to form a closed circuit, and power is transmitted to the pump shaft 26 to drive the hydraulic pump 40 to send hydraulic oil to the hydraulic motor 41. At this time, the rotation direction and the number of rotations of the hydraulic motor 41 can be continuously changed by tilting the movable swash plate 44. Thus, the hydrostatic stepless transmission is configured.

One end of the motor shaft 27 penetrates the center section 37 and is connected to the end face of the mission input shaft 35 exposed on the outer wall surface of the case half 11R. It is suspended. In the transmission case 11, as shown in FIG. 3, a final shaft 60 and front wheel drive shafts 71L and 71
A first and second counter shaft 61 and a second counter shaft 62 of R and PTO, and a side clutch shaft 97, a reduction shaft 98, and rear axles 99L and 99R are laid in parallel at the rear.

The front portion of the left case half 11L on the opposite side where the hydraulic motor 41 is disposed has a case bulged leftward to form a bulged portion 11a, and a second transmission 32 in the bulged portion 11a. Is stored. Then, as shown in FIGS. 5, 6, and 7, power is transmitted to the traveling power transmission system via the second transmission 32. That is, a large-diameter gear 67 and a wide small-diameter gear 68 are fixedly mounted on the transmission input shaft 35, and a final shaft 60 is arranged horizontally behind the transmission case 11 in parallel with the transmission input shaft 35, On the final shaft 60, two transmission gears 63 meshable with the gears 67 and 68 are spline-fitted slidably in the axial direction, and an output sprocket 65 and an output gear 66 are fixedly provided.

The transmission gear 63 can be slid left and right by operating a sub-transmission lever provided on the side of the seat 7, and by this sliding, the transmission gear 63 meshes with either the large-diameter gear 67 or the small-diameter gear 68. That is, two-step high-low 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. . 72 is a differential lock device.

As shown in FIG. 6, a front axle case 12 mounted on the front outer side surfaces of the left and right case halves 11L and 11R to accommodate the front wheel drive shafts 71L and 71R.
A bevel gear 73 is supported inside the front wheel drive shaft 71L.
It is connected to the end of 71R. A kingpin shaft 75 is supported in the front axle case 12 so as to extend substantially vertically, and projects downward. A lower portion of the kingpin shaft 75 extends into a turning case 76 to be rotatable. Bevel gear 7 is supported at the upper end of the kingpin shaft 75.
4 is fixedly engaged with the bevel gear 73, a bevel gear 77 is fixedly provided at the lower end of the king pin shaft 75, and meshes with a bevel gear 78 fixedly attached to the front axles 79L and 79R which are horizontally arranged below the rotating case 76. doing. The front axle 79L
The front wheel 13 is fixed to the outer end of 79R, and power is transmitted from the differential gear device 69.

FIG. 2 shows the upper surface of the rotating case 76.
As shown in FIG. 7, a knuckle arm 59 is fixedly connected to the steering handle 4 via a tie rod (not shown), and the front wheels 13 are moved right and left by the rotation of the steering handle 4. Steering is enabled.

Next, the power transmission configuration of the work transmission system will be described. As shown in FIGS. 4, 5, 6, and 7, a first counter shaft 61 and a second counter shaft 62 are parallel to the front and rear of the left case half in the bulging portion 11a, as shown in FIGS. 11L is rotatably supported by a cantilever, and a gear 8 is provided on the first counter shaft 61 via a one-way clutch 80.
The one-way clutch 80 prevents the reverse rotation from being transmitted to a PTO shaft 25 described later. The gear 81 meshes with one 64a of two PTO transmission gears 64 loosely fitted on the final shaft 60.
The other 64b of the PTO transmission gear 64 meshes with a small diameter gear 68 on the transmission input shaft 35. The one-way clutch 80 operates only when the transmission input shaft 35 rotates in the forward direction of the vehicle.

The first counter shaft 61 protrudes outward from the left side surface of the left case half 11L, and a gear 82 for inter-stock transmission is detachably 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 fixed in the transmission case 11 of the second counter 62 and meshes with a bevel gear 85 fixed on a 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 is coaxially arranged at the rear end of the PTO clutch shaft 86 on the same axis.
The O-axis 25 is rotatably arranged. A PTO clutch 90 and a torque limiter 91 are arranged between the PTO clutch shaft 86 and the PTO shaft 25. The PTO clutch 90 has a clutch claw 92 fixed to a front portion on a PTO clutch shaft 86, and a hollow shaft 93 is rotatably fitted to a rear portion thereof,
A sliding claw 94 is spline-fitted on the hollow shaft 93 so as to be slidable in the axial direction, and is arranged so as to be able to mesh with the clutch claw 92. The sliding claw 94 is slid by rotating a PTO operation shaft 95 pivotally supported on the right side surface of the right case half 11R. The PTO operation shaft 95 is connected to the side of the seat 7 via a link or a wire. Of the clutch claw 9 by connecting the planting operation lever to the "in" position.
2 and the sliding claws 94 can be engaged to drive the planting portion 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. Reference numeral 91a denotes a spring for defining a set torque. The PTO shaft 25 protrudes rearward from the bulge 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 configuration for transmitting power to the rear wheels will be described. As shown in FIGS. 3, 4, and 9, a side clutch shaft 97, a reduction shaft 98, and rear axles 99L and 99R are rotatably supported at the rear of the transmission case 11 in a parallel manner. A sprocket 100 is fixedly mounted at the center in the left-right direction, and a chain 101 is wound between the sprocket 100 and an output sprocket 65 fixed on the final shaft 60 so that power is transmitted to the rear wheel 15. ing.

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 overlapped with each of the side gears 102L and 102R and the left and right case halves 11L and 11R, and a flange-shaped pressing body is formed on the outer periphery of the side gears 102L and 102R to form a side brake 103L.・ 10
3R is configured. And the side gear 102
L · 102R is the side clutch arm 104L · 104
The side clutch arms 104L and 104R are slid by rotating the R, and the side clutch arms 104L and 104R are connected to arms 106L and 106R (FIG. When one of the side brake pedals is depressed, the side gear 102 slides on the corresponding side brake pedal and the side clutch 111L or the side clutch 11R.
To cut off the driving force of the rear wheel on the inside of the turn, and further brake the side brake 103L or 103R so that a sharp turn can be made.

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 power that has been shifted by the first transmission 31 and the second transmission 32 is transmitted to the output sprocket 65, the chain 101, the sprocket 100, and the side clutch 111.
Power is transmitted to the rear axle 99 via the L.111R and the side brakes 103L and 103R, and the rear wheel 15 is driven.

[0030]

As described above, the present invention has the following advantages. That is, as described in claim 1, the engine is mounted on the front part of the body frame, a transmission case formed long in the front-rear direction is arranged at the lower part of the body frame, and the front axle is provided at the front part of the transmission case. A rear axle is mounted and supported on a rear portion, and a hydrostatic continuously variable transmission is disposed at a front portion of the transmission case, and a hydraulic pump constituting the hydrostatic continuously variable transmission is mounted on a front portion of a transmission case. And the rotation axis of the pump shaft of the hydraulic pump is positioned along the longitudinal direction of the machine, so that the distance between the output shaft of the engine and the pump shaft can be shortened, and the transmission configuration can be simplified. Thus, the cost can be reduced, and the power loss can be reduced.

Further, as set forth in claim 2, a hydraulic motor constituting the hydrostatic continuously variable transmission is installed on a side face of a transmission case, and a rotation axis of the hydraulic motor and a rotation axis of the hydraulic pump are arranged orthogonally. Therefore, the motor shaft of the hydraulic motor is in the left-right direction, so that power can be transmitted to a gear-type transmission or a transmission gear without passing through a bevel gear or the like, and a compact power transmission configuration can be realized.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter equipped with a transmission of the present invention.

FIG. 2 is a plan view of a transmission and partial wheels.

FIG. 3 is a sectional plan view of a transmission case.

FIG. 4 is a side view in which a case half on one side is removed.

FIG. 5 is a side sectional view of a front part of a transmission case.

FIG. 6 is a developed cross-sectional view of a front part of a transmission case and a developed cross-sectional view of a front axle case on one side.

FIG. 7 is a developed cross-sectional view of a front part of a transmission case.

FIG. 8 is a plan sectional view of the first transmission.

FIG. 9 is a planar development sectional view of a rear part of a transmission case.

[Explanation of symbols]

 9 Engine 10 Airframe 11 Transmission case 26 Pump shaft 37 Center section 40 Hydraulic pump 41 Hydraulic motor 79L / 79R Front axle 99 Rear axle

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hironori Lizawa 2-181-1, Inaji, Amagasaki City, Hyogo Prefecture Inside Kanzaki High-Tech Koki Co., Ltd.

Claims (2)

[Claims] 1. An engine is mounted on a front part of a body frame, a transmission case elongated in the front-rear direction is arranged at a lower part of the body frame, and a front axle is provided at a front part of the transmission case, and a rear axle is provided at a rear part of the transmission case. Each of them is mounted and supported, and a hydrostatic stepless transmission is arranged at the front of the transmission case. A hydraulic pump constituting the hydrostatic stepless transmission is installed at the front of the transmission case. A transmission for a riding rice transplanter, wherein a rotation axis of a pump shaft of a pump is positioned along a longitudinal direction of a vehicle and connected to an output shaft of an engine. 2. A hydraulic motor constituting the hydrostatic stepless transmission is mounted on a side face of a transmission case, and a rotation axis of the hydraulic motor and a rotation axis of the hydraulic pump are arranged orthogonally. 2. The transmission of the riding rice transplanter according to 1.