JP3537270B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission for traveling in which the rotational power from an engine is continuously transmitted to the left and right rear wheels by a hydraulic continuously variable transmission for traveling. The present invention relates to a work vehicle configured to transmit the rotational power of an input shaft of a hydraulic pump of a device to a rear power take-out shaft located at a lower level than the input shaft so that the work can be taken out from a rear part of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, as a work vehicle, as disclosed in Japanese Patent Application Laid-Open No. 7-156672, for example, a differential for rear wheels in which an output shaft of a continuously variable transmission for traveling is linked to left and right rear axles. And a power take-off input shaft that is belt-linked to the input shaft of the hydraulic pump of the continuously variable transmission for traveling. The power take-out is also linked to the power take-off input shaft via a gear mechanism. In some cases, a power take-off device having a rear power take-off shaft located at a lower level than the input shaft and passing below the rear axle is provided. That is, the level difference between the input shaft of the hydraulic pump and the output portion on the engine side is small or small, and the angle of the rotary transmission shaft connecting the engine side and the pump input shaft is eliminated or reduced, and the rear portion is reduced. The distance between the pump input shaft and the rear power take-off shaft is adjusted by the belt interlock between the pump input shaft and the power take-out input shaft so that the power take-out shaft is located at a low level, such as below the rear axle, and power can be easily taken out. It can be set relatively arbitrarily and easily, and even if the belt pulley provided on the power take-out input shaft becomes a pulley with a large outer diameter, the level difference between the power take-out input shaft and the rear power take-out shaft Thus, it is possible to carry out traveling speed change and power extraction while making the ground height of the belt pulley as high as possible.

[0003]

In the case of the above-mentioned prior art, a gear case for housing a gear mechanism of a power take-out device and supporting an input shaft and a power take-off shaft and a case of a rear wheel differential mechanism are integrated. As a result, since the two devices are integrated, the rear wheel differential mechanism is relatively large, so that the overall size is large. In particular, when the distance between the pump input shaft and the rear power take-out shaft is set to be large, the size of the case, which accommodates the differential mechanism and supports the rear power take-out shaft, becomes large, and the size of the case is remarkably increased. SUMMARY OF THE INVENTION An object of the present invention is to make a vehicle which can perform traveling speed change and power take-out while setting the ground height advantageously, and arbitrarily and easily set the distance between the pump input shaft and the rear power take-off shaft in a relatively compact manner. It is to provide a work vehicle obtained.

[0004]

The structure, operation and effect of the invention according to claim 1 are as follows.

[0005] hydraulic pump rotational power is transmitted from the (Structure) engine had a hydraulic motor with Ru driven by the hydraulic motor extending laterally from the hydraulic motor driven by pressure oil from the hydraulic pump pressure Equipped with a continuously variable transmission for traveling , extending laterally from the hydraulic motor and
Work with a rear axle driven by the hydraulic motor
In a car, a power take-off input shaft interlocked with a power transmission belt to the input shaft of the hydraulic pump, and the power take-off input shaft is interlocked with a power take-off input shaft via a gear mechanism and located at a lower level than the power take-off input shaft. A power take-off device having a rear power take-off shaft facing rearward of the fuselage is formed as a separate device from the continuously variable transmission for traveling, and
When the rear power take-off shaft is located below the rear axle,
I have it .

[0006] [Operation] transmission belt to an input shaft of the oil pressure pump, power take-off input shaft,
The rear power take-off shaft is interlocked via the gear mechanism, so that the distance between the pump input shaft and the rear power take-off shaft can be adjusted arbitrarily by adjusting the length of the power transmission belt, and the rotational power of the pump input shaft can be adjusted to the rear. It can be removed from the rear by a power take-off shaft. Even when the rear power take-out shaft is set at a lower level, the ground height of the belt pulley of the power take-out input shaft may be reduced by the height of the rear power take-up shaft due to the level difference between the power take-out input shaft and the rear power take-out shaft. You can secure a high price. Even when the distance between the pump input shaft and the rear power take-out shaft is set to be large, the power take-out device and the continuously variable transmission are separate devices, making the case large as in the case of the conventional integrated device. Without this, the distance between the continuously variable transmission and the power take-out device can be increased.

[0007] belt transmission of [Effect] pump input shaft and power take-off input shaft, in addition to employing a level difference between the power take-off for the input shaft and the rear power take-off shaft, a separate device from the continuously variable transmission power By adopting the take-out device, it is possible to easily set the distance between the pump input shaft and the rear power take-out shaft arbitrarily, and to keep the ground height of the belt pulley as high as possible. it can. Moreover,
Even if the distance between the pump input shaft and the rear power take-off shaft is set to any size, a relatively small size can be obtained. The structure, operation and effect of the invention according to claim 2 are as follows.
It is as follows. [Configuration] In the configuration of the invention according to claim 1, the hydraulic motor and
And a pair of hydraulics respectively attached to the left and right rear axles
A motor is provided. [Operation and effect] The continuously variable transmission includes a pair of hydraulic motors, and each hydraulic motor
Is attached to the rear axle, adopting the conventional differential mechanism
The continuously variable transmission and the rear axle are more compactly linked
Continuously variable speed drive of the rear wheels

[0008] The constituent of the invention by claim 3, functions and effects are as follows.

[0010] In the configuration of the invention according to claim 1 or 2 , the rear end of the rear power take-off shaft is located below the hydraulic motor, and the rear end of the gear case of the power take-off device is connected to the hydraulic motor. Is also located forward.

[Operation] Since the rear end of the rear power take-off shaft is located below the hydraulic motor in a state of being exposed from the gear case, compared with the case where the rear power take-out shaft is located below the hydraulic motor while being housed in the gear case,
The rear power take-off shaft can be located below the axle close to the hydraulic motor so that the ground height is as high as possible.

[Effect] By arranging the rear power take-off shaft so as not to be too low below the axle, power can be taken out from under the axle while preventing the power take-out shaft from being easily damaged by collision of stones or the like. .

The structure, operation and effect of the invention according to claim 4 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 3, a mid power take-out portion facing forward of the fuselage is provided at a front end side of the power take-out input shaft.

[Operation] A working device such as a lawn mower connected between the front and rear wheels is connected to the mid power take-out portion of the power take-out input shaft, and can be driven by the rotating power of the power take-out input shaft.

[Effect] An advantageous state is obtained in which a mid-mount type working device can be connected to work.

The structure, operation and effect of the invention according to claim 5 are as follows.

[Configuration] In the configuration of the present invention according to claim 4 , a belt pulley for the power transmission belt is rotatably supported by the power take-out input shaft, and the belt pulley and the power take-out input are supported. A clutch is provided between the shaft and the shaft.

[Operation] By turning on and off the clutch, the rear power take-off shaft and the mid power take-out portion rotate together or stop rotating.

[Effect] For example, when the mid-mount type lawn mower and the grass collector are connected, and the suction blower of the grass collector is driven by the rear power take-off shaft, the operation is simply and quickly performed simply by switching the clutch. The lawn mower and blower can be stopped all at once and the vehicle can turn around, and the lawn mower and blower can be driven all at once to resume work.

The structure, operation and effect of the invention according to claim 6 are as follows.

[Configuration] In the configuration of the present invention according to claim 5 , the clutch is located forward of the belt pulley, and a front end of the clutch is located near a front end of the rear wheel in a side view of the body.

[Operation] Compared to the case where the clutch projects greatly forward from the rear wheel, even when the front-rear length of the mid-mount type working device is long,
The clutch can be connected while easily avoiding interference with the clutch, and can be driven while minimizing the bending angle of the rotary transmission shaft connecting the working device and the mid power take-out unit.

[Effect] Even a working device having a relatively long front-rear length can be connected and operated quietly while suppressing the bending angle of the rotary transmission shaft to a small value.

The configuration, operation and effect of the invention according to claim 7 are as follows.

[Configuration] In the configuration of the invention according to claim 5 or 6 , there is provided a charge pump for taking out lubricating oil from a gear case of the power take-out device and supplying it as hydraulic oil to the continuously variable transmission for traveling.

[Operation] When oil for operating the continuously variable transmission for traveling is stored in the gear case of the power take-out device, the oil is taken out of the gear case by the charge pump and replenished to the continuously variable transmission.

[Effect] By using the gear case of the power take-out device for the hydraulic oil tank, it is possible to obtain a compact state in which a special hydraulic oil tank is unnecessary.

The structure, operation and effect of the invention according to claim 8 are as follows.

[Configuration] In the configuration of the invention according to claim 7 , a cooling fan for the gear case is attached to the belt pulley so as to be rotatable integrally therewith.

[Effects] Regardless of whether the clutch is switched between on and off, that is, when a working device that transmits power from the rear power take-out shaft or the mid power take-out portion is driven or not driven, The cooling fan is driven by the belt pulley and supplies cooling air to the gear case to cool the oil in the case.

[Effect] The continuously variable transmission can be efficiently operated by always replenishing the operating oil with the lowest possible temperature.

The structure, operation and effect of the invention according to claim 9 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 2 to 7, the hydraulic pump of the continuously variable transmission for traveling and the pair of hydraulic motors are connected to each other.

[Operation] A continuously variable transmission for traveling can be obtained in a compact state in which the hydraulic pump and the hydraulic motor are connected.

[Effect] The whole device can be made smaller by using a separate device for the continuously variable transmission for traveling and the power take-off device, so that the size of the continuously variable transmission for traveling can be further reduced.

The structure, operation and effect of the invention according to claim 10 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 2 to 8, the hydraulic pump and the pair of hydraulic motors of the continuously variable transmission for traveling are separated and connected by piping. .

[Operation] The hydraulic pump and the hydraulic motor are separated in consideration of the power take-out device and the machine body part, and installed at locations where they can be easily arranged, so that the continuously variable transmission for traveling can be easily assembled to the machine body. As well as being obtained, the power take-out device can be designed so that it can be easily assembled to the body.

[Effect] Both the continuously variable transmission for traveling and the power take-out device can be easily assembled to the machine body, and the entire work vehicle can be efficiently assembled.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of left and right steerable front wheels 1, 1 and a pair of left and right drivable rear wheels 2, 2 are configured to travel by themselves. A self-propelled body equipped with a driving unit having an engine E at the front of the body and a driving unit provided with a steering wheel 3 and a driver seat 4 at the rear of the body. The lawn mowing device 6 is connected so that it can be operated, and power is transmitted to the lawn mowing device 6 from the rear portion of the self-propelled body via the rotating shaft 7. A grass collector 8 is attached to the rear of the self-propelled body, and a suction device 9 provided with a rotary blower 9a of the grass collector 8 is connected to a grass discharge section of the lawn mowing device 6 by a grass transport duct 10, and the self-propelled vehicle is driven. Power is transmitted from the rear part of the body to the suction device 9 via the rotating shaft 11, and the cut turf discharged from the lawn mowing device 6 is transported to the grass collector 6 by the operation of the suction device 9 and stored. Thus, a riding lawn mower is configured.

As shown in FIGS. 2 to 4, a rear axle case 13 rotatably supporting a rear axle 12 to which the left rear wheel 2 is connected, and a rear axle case to which the right rear wheel 2 is connected. The casing of the hydraulic motor M on the left side and the casing of the hydraulic motor M on the right side are connected to each end of a rear axle case 13 rotatably supporting the axle 12 by bolts 14. They are connected by an oil passage forming member 15. That is, the left and right rear axle cases 13, 13 are connected by a pair of hydraulic motors M, M and one oil path forming member 15. A flange portion 13a connected to the hydraulic motor M of each rear axle case 13, 13 is provided on one of a pair of brackets 17, 17 provided separately on a pair of left and right body frames 16, 16 of the self-propelled body. Bracket 17
The left and right rear wheels 2, 2 are rotatably supported by the self-propelled body by being connected to the lateral side plate portion 17a using the bolts 14 as shown in FIG.

As shown in FIGS. 3 and 4, one hydraulic pump P is mounted on the upper surface side of the oil passage forming member 15, and the hydraulic pump P and the pair of hydraulic motors M, M are used to drive the engine E. A hydrostatic running continuously variable transmission 18 that switches the rotational power between a forward side and a reverse side with a neutral in between, and continuously changes the speed on both the forward and rearward sides and transmits it to the left and right rear wheels 2. To allow the self-propelled body to perform variable-speed traveling and stop operations. The continuously variable transmission for traveling 18 is configured in detail as follows.

The output section (not shown) of the left hydraulic motor M of the pair of hydraulic motors M, M is mounted so as to rotate integrally with the left rear axle 12, and the output section of the right hydraulic motor M (not shown). (Not shown) is attached to the right rear axle 12 so as to rotate integrally therewith. By connecting the pump casing of the hydraulic pump P to the oil passage forming member 15 by connecting it,
A hydraulic pump P and a pair of hydraulic motors M, M are connected so as to be an integral part, and a transmission drive oil passage 19 formed inside the oil passage formation member 15 as shown in FIG.
And a pump-side oil passage 19a provided in the hydraulic pump P, the pair of hydraulic motors M, M are connected in parallel to the hydraulic pump P. The hydraulic pump P is a variable displacement hydraulic pump. An input shaft 18a of the pump P projecting forward from the body of the pump P is attached to the input shaft 18a so as to be integrally rotatable. Is connected to the output part of the engine E via a rotating shaft 21 having a universal joint part 21a connected to the engine E. Thus, the hydraulic pump P is driven by the rotating power transmitted from the engine E to supply the hydraulic oil to the hydraulic motors M, M, and the hydraulic motors M, M are driven by the hydraulic oil for the rear axle. 12 is driven to rotate. When the rotary operation shaft 18b is operated by a speed change pedal (not shown) arranged in the operation unit in association with the rotary operation shaft 18b as shown in FIG. P
And the hydraulic motors M, M rotate in the forward direction to drive the rear axle 12 forward, or rotate in the reverse direction to drive the rear axle 12 backward. I do. When a difference in driving resistance occurs between the left and right rear wheels 2 and 2 when the vehicle turns, for example, a rotational speed difference occurs between the two hydraulic motors M and M because the two hydraulic motors M and M are connected in parallel to the hydraulic pump P. The left and right rear wheels 2 are provided with a difference in drive speed.

As shown in FIG. 2, a power take-out device A for detachably connecting the rotational power of the input shaft 18a of the hydraulic pump P to the front and rear sides of the body is provided by the continuously variable transmission 18 for traveling. Left and right rear wheels 2,
2 and the power take-out device A is configured to transmit power to the lawn mowing device 6 by the rotary shaft 7 and to the suction device 9 by the rotary shaft 11, respectively. , And both devices 6, 9 can be driven and stopped at once. The power take-out device A is shown in FIG.
And as shown in FIG.

The power take-out device A includes the continuously variable transmission 1
8 is formed as a separate part from the hydraulic pump P and the hydraulic motor M, and is disposed near the lower part of the hydraulic pump P.
2. The upper part of the gear case 22 is rotatably supported via a bearing 23 and one end of the gear case 22
2, an input shaft 24 for taking out power formed so as to protrude forward from the body, an input belt pulley 25 attached to a portion of the input shaft 24 protruding from the gear case 22, and an input belt pulley 25 of the input shaft 24. A clutch 26 provided between a portion protruding forward of the fuselage and an input belt pulley 25, and the input shaft 2 of the gear case 22;
4 is rotatably supported via a bearing 27 at a position located at a lower level than the gear case 2 at one end.
2 is provided with a rear power take-off shaft 28 formed to protrude rearward from the fuselage.

The input shaft 24 is formed by a rear shaft portion supported by the gear case 22 and a front shaft portion formed as a separate component from the rear shaft portion. The two shaft portions are integrally rotatably connected by the attachment member of the clutch 26 to the input shaft 24 being engaged over the both shaft portions.

The gear case 22 is bolted to the front plate 17b of the pair of left and right brackets 17 as shown in FIG. The rear end of the rear power take-off shaft 28 that is exposed from the gear case 22 passes near the lower side of the left hydraulic motor M of the pair of hydraulic motors M, M, and the rear end is rearward of the hydraulic motor M. The rear end 22a of the gear case 22 is disposed forward of the hydraulic motor M so that the rear end of the rear power take-off shaft 28 can be brought as close as possible to the hydraulic motor M. Thus, the power take-out device A is supported by the body frame 16 while keeping the height of the rear power take-out shaft 28 above the ground as high as possible.

The input belt pulley 25 is supported by the power take-out input shaft 24 via a bearing 29 so as to be relatively rotatable. As shown in FIGS. 3 and 6, the input belt pulley 25 and the input shaft 18 of the hydraulic pump P are connected to each other.
a transmission belt 32 is mounted over the belt pulley 20a and a tension pulley 31 rotatably supported by a support arm 30 extending from the boss portion 16a of the body frame 16, and the support arm 30 is connected to the boss portion. A transmission tension is applied to the transmission belt 32 by a tension spring 33 which urges the tension pulley 31 to move in the belt tensioning direction by slidingly biasing the tension pulley 31 outwardly from the body 16a. As a result, the input belt pulley 25 is constantly rotated by the rotational power interlocked with the belt from the input shaft 18a of the hydraulic pump P.

The clutch 26 connects the input shaft 24 and the belt pulley 25 so as to be integrally rotatable at a portion of the input shaft 24 projecting forward of the input belt pulley 25 from the input belt pulley 25, and releases the connection. Thus, the electromagnetic clutch is configured to disable relative rotation between the two. That is, the drive-side clutch body 26a which is fitted to the input shaft 24 so as to be relatively rotatable and is integrally rotatably connected to the input belt pulley 25, and is integrally rotatably connected to the input shaft 24 by meshing engagement. A clutch case in which the passive clutch body 26b and the input shaft 24 are rotatably supported by the input shaft 24 via a bearing 34, and are locked so that the outer peripheral portion is prevented from rotating by a fixing member (not shown) on the machine body side. 26c, an electromagnet section 26d provided inside the clutch case 26c. This electromagnet section 26
d, the clutch is engaged and the electromagnet section 26d
The passive clutch body 26b attracts the driving clutch body 26a due to the magnetic force generated in the both clutch bodies 26a, 2a.
6b are connected so as to be integrally rotatable. And the electromagnet section 26
When the energization of the clutch body d is stopped, the clutch is disengaged, and the generation of the magnetic force by the electromagnet portion 26d is released, so that the suction of the drive side clutch body 26a by the passive side clutch body 26b is released, and the relative rotation of both the clutch bodies 26a, 26b is reduced. Will be possible.

A mid power take-out shaft portion 24a is formed by forming a spline at the front end of the input shaft 24 protruding forward from the clutch 26 with respect to the fuselage to enable power take-out. The portion 24a is connected to the universal joint portion 7a of the rotary shaft 7.

An input shaft gear 35a is mounted inside the gear case 22 so as to be integrally rotatable by spline-in engagement with the input shaft 24, and is formed to mesh with the input shaft gear 35a. With the take-out shaft gear 35b attached so as to be integrally rotatable in some cases,
A gear mechanism 35 is configured so as to be linked with the input shaft 24 and the rear power take-out shaft 28, and when the input shaft 24 rotates, the turning power is transmitted to the rear power take-out shaft 28. The rear end of the rear power take-out shaft 28 is connected to the universal joint 11 a of the rotary shaft 11.

Therefore, when the clutch 26 is turned on, the rotational power of the input shaft 18a of the hydraulic pump P is transmitted to the power take-out input shaft 24 via the input belt pulley 25 and the clutch 26, and the mid power take-out shaft portion 24a is moved. While rotating, the turning power of the power take-out input shaft 24 is transmitted to the gear mechanism 35, and the rear power take-out shaft 28 rotates. Then, the rotating power of the mid power take-out shaft portion 24a is transmitted to the lawn mowing device 6 by the rotating shaft 7, and the rotating power of the rear power take-out shaft 28 is transmitted to the suction device 9 by the rotating shaft 11. And
When the clutch 26 is turned off, the input belt pulley 2
When the transmission between the power take-out input shaft 24 and the power take-out input shaft 24 is cut off, the rotational power transmission from the input shaft 18a of the hydraulic pump P to the power take-out input shaft 24 is cut off, and the power take-out input shaft 24 stops, The mid power take-out shaft 24a stops and the rear power take-off shaft 28 also stops. Thereby, the transmission to the rotating shaft 7 is stopped, and the driving of the lawn mowing device 6 is stopped, and the transmission to the rotating shaft 11 is stopped, and the driving of the suction device 9 is also stopped.

As shown in FIG. 8, the clutch 26
The clutch 26 is arranged so that the front end of the clutch 26 is located near the front end of the rear wheel 2 in a side view of the machine body. That is, the length of the mid power take-out shaft portion 24a protruding forward from the rear wheel 2 is reduced as much as possible, and the mid power take-out shaft portion 24a and the lawn mower 6
Of the rotary shaft 7 becomes as long as possible with the input shaft 6a.
The rotation shaft 7 can be mounted while minimizing the angle of bend at the universal joint 7a.

A charge pump P1 is provided in the casing of the hydraulic pump P. This charge pump P1
Is driven by the input shaft 18a to take out the lubricating oil therein from the gear case 22 by a suction pipe 36 connecting the suction part of the charge pump P1 to the oil discharge part of the gear case 22, and Is supplied to the transmission drive oil passage 19 by an oil supply pipe 37 connected to an oil replenishing portion of the oil passage formation member 15. That is, lubricating oil for lubricating the gear mechanism 35 of the gear case 22 and the like is stored as hydraulic oil for driving the continuously variable transmission 18 for traveling, and the gear case 22 is stored as a tank. It is taken out of the vehicle 22 and replenished to the continuously variable transmission 18 for traveling.

[Another Embodiment] FIGS. 9 and 10 show a continuously variable transmission for traveling 18 and a power take-out device A provided with another embodiment.

The continuously variable transmission for traveling 18 includes left and right rear axles 12, like the hydraulic motor M shown in FIGS.
A pair of hydraulic motors M, M attached separately to each other and connected by an oil passage forming member 15 are separated from the hydraulic motors M and supported on a body frame 16 separately from the hydraulic motors M. And a plurality of variable displacement hydraulic pumps P. The pair of oil suction / discharge portions of the oil passage forming member 15 are connected to a pair of oil suction / discharge portions of the hydraulic pump P by a pair of pipes 38,38.
b, a pair of hydraulic motors M, M are connected in parallel to the hydraulic pump P as shown in FIG.

The power take-out device A is provided with a cooling fan 39 disposed on the opposite side of the input belt pulley 25 from the clutch 26 side. The cooling fan 39 is attached to the input belt pulley 25 so as to be rotatable integrally with the input belt pulley 25.
The rotation is always performed irrespective of the on / off state, and cooling air is supplied to the gear case 22 to cool the internal lubricating oil.

[0058] Input shaft gear 35a mounted so as to be thus integrally rotate the spline engagement on the power take-off input shaft 24 inside the gear case 22, extraction was mounted for integral rotation by integral molding to the rear power take-off shaft 28 Shaft gear 35b,
The power take-out input shaft 24 and the rear power take-out shaft 28 are formed by three gears 35a, 35b, 35c of an intermediate gear 35c formed so as to mesh with the gears 35a, 35b and rotatably supported by the gear case 22. Are linked to each other to form a gear mechanism 35. As a result, the rear power take-out shaft 28 rotates in the same rotational direction as the power take-out input shaft 24.

The present invention is applicable not only to lawn mowers but also to various vehicles such as agricultural tractors. Therefore, these are collectively called a work vehicle.

[Brief description of the drawings]

FIG. 1 is a side view of an entire riding lawn mower.

FIG. 2 is a side view of a transmission structure.

FIG. 3 is a cross-sectional view of the power take-out device.

FIG. 4 is a front view of an arrangement portion of a continuously variable transmission and a power take-out device for traveling.

FIG. 5 is a perspective view of an axle case mounting portion.

FIG. 6 is a front view of a transmission structure for the power take-out device.

FIG. 7 is a hydraulic circuit diagram of the continuously variable transmission for traveling.

FIG. 8 is a transmission structure including a continuously variable transmission and a power take-out device according to another embodiment.

FIG. 9 is a sectional view of a power take-out device according to another embodiment;

FIG. 10 is a front view of an arrangement portion of a continuously variable transmission for traveling and a power take-out device of another embodiment.

FIG. 11 is a hydraulic circuit diagram of a continuously variable transmission for traveling according to another embodiment.

[Explanation of symbols]

2 rear wheels 12 Rear axle 18 continuously variable transmission 22 Gear case 22a rear end 24 Input shaft for power take-out 24a Mid power take-out part 25 Input belt pulley 26 clutch 28 Rear power take-off shaft 32 transmission belt 35 Gear mechanism 39 Cooling fan A Power take-out device P hydraulic pump P1 charge pump M hydraulic motor E engine

Continuation of front page (56) References JP-A-7-156672 (JP, A) JP-A-3-24352 (JP, A) JP-A-7-52666 (JP, A) JP-A-5-278481 (JP) JP-A 7-323740 (JP, A) JP-A 1-123935 (JP, U) JP-A 63-112406 (JP, U) JP-A 57-108462 (JP, U) 4-105257 (JP, U) JP-A 2-135765 (JP, U) JP-A 52-74006 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 17/00 B60K 17/28

Claims (10)

(57) [Claims] 1. A hydraulic pump rotational power is transmitted from the engine, Ru is driven by pressure oil from the hydraulic pump
Comprising a hydraulic traveling stepless transmission having a hydraulic motor, wherein with extending laterally from said hydraulic motor
Work vehicle with rear axle driven by hydraulic motor
There are, power take input shaft which is engaged by a transmission belt to an input shaft of the hydraulic pump, located in the low level from the power take-off input shaft with are linked via a gear mechanism to the power take-off input shaft A power take-out device having a rear power take-off shaft facing rearward of the fuselage is formed as a separate device from the continuously variable transmission for traveling, and
A work vehicle provided with an output shaft located below the rear axle . 2. The work vehicle according to claim 1, wherein a pair of hydraulic motors respectively attached to left and right rear axles are provided as the hydraulic motors. 3. A rear end of the rear power take-off shaft is located below the hydraulic motor, and a rear end of a gear case of the power take-off device is located ahead of the hydraulic motor. The working vehicle described. 4. A mid power take-out portion facing forward of the fuselage at a front end side of the power take-out input shaft.
The work vehicle according to any one of the preceding claims. 5. The power take-off input shaft has a belt pulley for the power transmission belt rotatably supported thereon, and a clutch is provided between the belt pulley and the power take-out input shaft. Item 4. The work vehicle according to Item 4. 6. The work vehicle according to claim 5, wherein the clutch is located forward of the belt pulley, and a front end of the clutch is located near a front end of the rear wheel in a side view of the machine. 7. The work vehicle according to claim 5, further comprising a charge pump for taking out lubricating oil from a gear case of the power take-off device and supplying the lubricating oil as hydraulic oil to the continuously variable transmission for traveling. 8. A cooling fan for said gear case is attached to said belt pulley so as to be rotatable integrally therewith.
The working vehicle described. 9. The hydraulic pump according to claim 2, wherein the hydraulic pump and the pair of hydraulic motors of the continuously variable transmission for traveling are connected to each other.
8. The work vehicle according to any one of items 7 to 7. 10. The work vehicle according to claim 2, wherein the hydraulic pump and the pair of hydraulic motors of the continuously variable transmission for traveling are separated and connected by piping.