JPH09194199A - Working vehicle equipped with working device attached to fork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a given work by forming up an agricultural tractor by using a fork equipment, and letting a fork be functionally equipped with a working device in addition to the normal fork equipment. SOLUTION: A fork 21 located in the forward portion of a work vehicle, is equipped with a working device 40, and the aforesaid working device is formed into a unit where a driving device 45 located in the upper part of a working machine supporting frame 41, is combined with a grass cutting device 50 located in the lower part. In the grass cutting device, a plurality of grass cutting blades 53,... are disposed in a disc shaped member 51 rotated around a vertical shaft for the purpose of grass cutting, and it is so designed that the whole of the output of an engine is fed to a hydraulic motor disposed to the driving device as hydraulic pressure out of a power generating device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forklift-type working vehicle having a rubber crawler mounted on a traveling portion, and more particularly to carrying a cargo using a fork and performing an arbitrary work by a working device mounted on the fork. The present invention relates to a work vehicle equipped with a work device on a fork configured so as to be capable of

[0002]

2. Description of the Related Art A forklift-type cargo handling vehicle is provided with a fork at the front portion of a vehicle body through an elevating device, and is used for work such as transportation of cargo and loading / unloading of cargo. Since the work vehicle is generally used in a place where the road surface is paved, such as a factory, a warehouse, or a cargo handling yard, the traveling section is equipped with rubber tires. In addition, a general forklift-type work vehicle is equipped with only a fork and is provided with a means for running the vehicle while the luggage is placed on the fork. In addition to, it is known to equip a working device. As the working device, a cleaning device is attached to the fork to clean the cargo handling yard as in Japanese Utility Model Laid-Open No. 57-22510, or a fork is used instead of the Japanese Utility Model Laid-Open No. 57-202619. There is proposed a work vehicle which can be used for various purposes such as arranging a cutting device so that cutting work can be performed.

Further, as described above, in addition to the example in which the rubber tire is provided on the running portion, it has been proposed to provide the running portion with a crawler so that the running portion can be used on rough terrain or rough terrain. For example, in the example disclosed in Japanese Patent Laid-Open No. 57-137299, a fork is attached in place of a conventional work device such as a shovel loader or a bulldozer for a work vehicle, and a device that can be used as a work vehicle is configured. doing. Further, a conventional example disclosed in Japanese Utility Model Laid-Open No. 58-30695 discloses a device in which a fork is arranged in the front portion of a crawler type vehicle and can be used as a work vehicle. By providing a fork on the crawler type work vehicle, it is possible to easily carry out cargo handling work or the like at a work site that is not paved.

[0004]

However, in a working device such as a forklift having a crawler provided on the traveling portion as described above, since an iron crawler is used, the work device is used in the premises of an asphalt pavement factory or the like. Its use is limited, and it is limited to use on uneven terrain. Therefore, for example, when the road is uneven on a lumber yard or other specific work site, it can be used very effectively, but it cannot be used in a paved place such as a warehouse or factory. However, due to the limited use of work vehicles, the problem remains that expensive devices cannot be fully utilized.

Further, in the work vehicle as described above, as in a general automobile, a system in which the power of an engine is transmitted to a drive sprocket of a crawler through a mission device to drive a traveling portion is often used. ing. Further, the hydraulic pump corresponding to the hydraulic cylinder used for the vertical movement and the tilting of the fork is only one having a very small capacity, and it is attempted to equip the work vehicle with another work device. In that case, it is necessary to separately provide a generator and a battery. In addition to the problems described above, in the conventional work vehicle, it is only considered to be equipped with a work device in correspondence with cleaning in the factory yard and other limited applications. It is not considered to equip a fork with a work device adapted to a specific purpose so as to increase the ratio of performing other work.

The present invention eliminates the above-mentioned limited conditions of use of a work vehicle and expands its application. It uses a function of converting all the output of the engine into hydraulic pressure and uses a rubber crawler for the traveling portion. It is therefore an object of the present invention to provide a work vehicle adapted to work on uneven terrain, and to provide a work vehicle that can be generally used for agricultural work and can also handle crops at the same time.

[0007]

SUMMARY OF THE INVENTION A work vehicle equipped with a work device on a fork according to the present invention comprises a work machine support frame mounted on the fork of the work vehicle, and a hydraulically operated drive device provided on the work machine support frame. And a work device driven by the drive device as one unit, and a power generation device for supplying hydraulic pressure to the drive device is provided in the work vehicle. In the present invention,
The working device is configured by a mowing device, the mowing device is configured by projecting a large number of cutting blades around a disc-shaped member, and a device for rotating the disc-shaped member via a vertical shaft by a drive device. Can be configured. Further, in the present invention, the working device is constituted by a cultivating device, and the cultivating device is arranged so that a large number of cultivating blade members are projected on the lower surface of the disk-shaped member, and the disk-shaped member is driven by a vertical shaft. It is also possible to configure a device that rotates via.

In addition to the above configuration, in a work vehicle equipped with a work device for a fork of the present invention, the power generator arranged in the work vehicle converts all of the output of the engine into hydraulic pressure and outputs power to the work device. Is provided, two hydraulic pumps for driving a rubber crawler arranged in the traveling part of the work vehicle, and a hydraulic pump for vertically moving the working device are arranged to correspond to the rubber crawler in the traveling part. The two hydraulic pumps are configured such that the outputs of the two hydraulic pumps can convert all of the output of the engine into hydraulic pressure and can be used for traveling of the work vehicle.

Further, the work vehicle of the present invention includes a cargo handling device including a fork arranged in the front part of the vehicle body, a work device supported by the cargo handling device, and a power generation device including an engine arranged in the rear part of the vehicle body. , A rubber crawler driven by a hydraulic motor arranged in the traveling section, and the power generation device is provided with four hydraulic pumps for converting the output of the engine into hydraulic pressure and outputting the hydraulic power in series with the output shaft of the engine. , One of the four hydraulic pumps is located at a position closest to the engine, and has the ability to convert all of the output of the engine into hydraulic pressure for driving the working device. The two hydraulic pumps arranged to drive the rubber crawlers arranged in
It is possible to connect each of the hydraulic pumps to a hydraulic motor via a pipe line directly connected thereto and use one hydraulic pump as a drive source for moving the working device.

With the above-mentioned construction, the work vehicle of the present invention is provided with the power generation device for converting all of the output of the engine into hydraulic pressure and outputting the hydraulic pressure to the two rubber crawlers arranged in the traveling portion. Even in the hydraulic pumps that are respectively arranged, the capacity of the hydraulic pumps is set so that the entire output of the engine can be used for traveling. Therefore, in the work vehicle, when the vehicle is simply driven, the entire output of the engine can be used for running, and when the work device is operated while the work vehicle is stopped, the engine is Can be used as a driving force for the working device. Further, when operating the work device while the work vehicle is traveling at a low speed, it is possible to supply all of the output except the power used for traveling to the work device, so that the output of the engine is always output. It is possible to configure a device that performs work using 100%.

In the work vehicle of the present invention, the unit of the work device is arranged via the fork provided in the cargo handling device, and the disk-shaped member is driven by using the hydraulic motor of the work device. When a large resistance is applied to the fork, it is possible to prevent the working device from being damaged due to the fork itself moving upward. Further, the working device is optionally equipped with a device having a function such as a mowing device configured by attaching a cutting blade to a disc-shaped member, or a plowing device configured by providing a plowing blade member on the disc-shaped member. Therefore, it is possible to perform a work similar to that of the agricultural tractor device and a work as a fork device. Also, by providing a rubber crawler on the running part, it is possible to use the work vehicle for work in places where rubber wheels cannot run, such as on uneven terrain, and for use in general work places using the fork function. Is possible.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A work vehicle in which a fork of the present invention is equipped with a work device will be described with reference to an example shown in the drawings. In a work vehicle 1 shown in FIG. 1, a traveling unit 10 is configured by a rubber crawler 11, and the rubber crawler 11 is driven by being driven by a driving wheel 12 driven by a hydraulic motor and a driven wheel 14 to drive the rubber crawler. A plurality of intermediate rollers 15 ... Are provided in the ground contact direction at the intermediate portion. Further, the vehicle body 2 supported by the traveling unit 10 is provided with the power generation device 4 at the rear part and the cargo handling device 20 at the front part so that the visibility from the driver's seat is favorably set and the cargo handling device 20 is provided. The weight of the rear part of the vehicle body is balanced with the weight supported by the fork 21. The traveling unit 1
The rubber crawler 11 constituting 0 is disclosed in, for example, Japanese Patent Laid-Open No.
It is possible to use a member having a structure as disclosed in Japanese Patent No. 193574, etc., and has good performance for traveling on rough terrain, etc., and it may damage the road surface even when traveling on a paved road, etc. Make up a crawler without.

Power generator 4 arranged on the work vehicle 1
Has a configuration as shown in FIG. 2, and four hydraulic motors 6 to 9 are arranged in series on the output shaft of the engine 5. Of the four hydraulic pumps, the hydraulic pump 6 directly connected to the engine is configured as a large capacity pump,
Hydraulic motor 4 of working device 40 supported by fork 21
6, hydraulic pressure can be supplied to the hydraulic motor 6, and 100% of the output of the engine can be converted into hydraulic pressure and supplied to the hydraulic motor 46. The hydraulic pumps 7 and 8 arranged after the large-capacity hydraulic pump 6 are provided corresponding to the left and right crawlers arranged in the traveling part of the work vehicle. The hydraulic pump 7 is a hydraulic motor for the left crawler. The hydraulic pump 8 is arranged so as to drive a hydraulic motor 13a of the crawler on the right side by connecting a pipeline for directly supplying hydraulic pressure to 13. Further, the hydraulic pump 9 supplies hydraulic pressure to the hydraulic cylinder 32 for raising and lowering the fork and the tilting cylinder for tilting the fork. However, the hydraulic pump 9 consumes pressure oil in the hydraulic cylinder. The pump is constructed with a small capacity to cope with the very small number.

In the power generator 4 shown in FIG. 2, the large-capacity hydraulic pump 6 has an engine output of 100.
By providing a performance that can be converted into a% hydraulic pressure and output, it becomes possible to configure a device that can maximize the output of the engine when the work device is driven while the vehicle is stopped. In addition, the two hydraulic pumps 7 and 8 for driving the left and right crawlers of the vehicle have such performance that the outputs of the two hydraulic pumps correspond to the output of 100% of the engine, and hold the load on the fork. When the vehicle is driven, all the output of the engine is made available for traveling. In the power generator of the present invention, the hydraulic pumps 6 to 8 may be variable displacement hydraulic pumps, and the hydraulic pump 9 may be a piston pump or any other pump. Further, in the variable displacement hydraulic pump, it is possible to rotate the hydraulic motor in the forward and reverse directions by changing the discharge direction of the hydraulic pressure, and by controlling the discharge amount of the pressure oil from the hydraulic pump, it is possible to arbitrarily The rotational speed of the hydraulic motor can be changed.

The work vehicle 1 provided with the power generation device as described above basically constitutes a cargo handling device using a fork. However, as in the case of a general fork device, the work handling device is illustrated. 3 can be configured as schematically shown. In the example shown in FIG. 3, the cargo handling device 20 includes a support shaft 2 provided on a bracket 26 at the front portion of the vehicle body of the vehicle body.
The tilting cylinder 28 is used to tilt the column member 25. The column member 25 is provided with a hydraulic cylinder 32 for moving the elevating column member 31 in the vertical direction with respect to the fixed column member 30, and the lower portion of the hydraulic cylinder 32 is attached to the fixed column member 30 via a support shaft 32b. The upper part is attached to the elevating column member 31 via the support shaft 32a. Further, a pulley 33 is arranged above the elevating column member 31, and a conductive member 34 such as a chain is wound around the pulley 33.
One end is fixed to the fixed column member 30 by the mounting portion 34a, and the other end is mounted on the fork frame 22 by the mounting portion 34b.

Then, by operating the hydraulic cylinder 32, the fork frame 22 is moved up and down via the elevating column member 31 which slides with respect to the fixed column member, and is mounted on the fork 21 arranged on the fork frame 22. You can carry your luggage. Therefore, in the cargo handling apparatus 20 having the above-described configuration, the load supported on the fork can be moved up and down by the hydraulic cylinder, but an action of pushing up the fork from the lower surface is added. When the pushing force is larger than the weight of the fork or the weight of the load, the fork rises according to the force. In the work vehicle according to the present embodiment, as will be described later, when a large amount of reaction force acts on the work device when the work device is supported by the fork and a predetermined work is performed, the fork and the work device are separated from each other. Can be moved in the direction of escaping the reaction force.

[0017]

EXAMPLE As an example of performing work by supporting a working device on a fork with respect to the forklift device, FIGS.
Attach the working device 40 as shown in FIG.
It can be configured as zero. In the working device 40, an inserting portion 42 for mounting the fork 21 is provided on the working machine support frame 41, and the fork 21 is inserted into the inserting portion 42 and fixed by using a stopper member 43. Hold it. As the stopping member, a simple stopping method such as inserting a pin into the hole can be used, or any means such as a method of fixing with a bolt can be provided, and the working device is configured as one unit. By mounting on a fork, an arbitrary working device can be easily mounted on a working vehicle. Further, a drive device 45, which is a combination of a hydraulic motor 46 and a speed reducer 47, is provided above the work machine support frame 41, and a drive shaft 48 is provided so as to vertically penetrate the work machine support frame 41. A mowing device 50 is attached to the lower part of 48 using a plurality of stop members 49.

The mowing device 50 can be constructed as shown in FIG. 6, and is fixed at a position close to the circumferential portion with respect to the disk-shaped member 51 having a hole to be attached to the drive shaft 48. A large number of mounting holes 52 ... Are provided at intervals. The mounting holes 52 provided in the disk-shaped member 51 may be round holes, but when configured as square holes, rotation of the cutting blade 53 is prevented even when the cutting blade 53 is mounted using one mounting hole. Then, it becomes possible to fix and hold. In the example of the cutting blade 53 shown in FIG. 6, blades for cutting are provided respectively on the slopes on both sides from the projected top portion so as to correspond to the mowing work. Whether the blade is rotated in the clockwise direction or the counterclockwise direction, the cutting work can be performed by the blade of the cutting blade. Incidentally, as the cutting blade, it is possible to use a blade member of any shape, as shown in the embodiment, is not limited to using a double-edged cutting blade, narrow single-edged It has an arbitrary shape such as the use of a blade or a cutting blade attached to one attachment hole, and the configuration of the attachment means can be set arbitrarily.

In the working device 40 equipped with the mowing device 50 as shown in FIG. 6, as shown in FIG.
Two mowing devices 50, 50 on the work implement support frame 41
It is possible to construct a working device for carrying out the work of mowing by attaching a and rotating each mowing device individually in an arbitrary direction by a hydraulic motor. In the working device, for example, when two mowing devices are rotated in the X direction, it is possible to perform work such that the mowed grass is moved to the right side of the device, and the two mowing devices are rotated in the opposite Y direction. You can also move the grass to the other side. Further, the mowing device 50 is rotated in the Y direction to move the mowing device 5
When the grass is cut in the X direction, the mowed grass can be grouped in a row in the center of the machine. You will be able to separate them on both sides.

Therefore, when the working device is constituted by a mowing device, it is possible to bring the mowed grass closer to build a mountain by arbitrarily setting the rotation direction of each mowing device. It is also possible to easily carry out the work of grouping after. Furthermore, even if there is a place where the soil rises during the mowing work, the reaction force applied to the disc-shaped member raises the entire device together with the fork, and no extra force acts on the cutting blade. The action can be performed.

[0021]

[Embodiment 2] In addition to the above-mentioned mowing device, the working vehicle of the present invention may be equipped with a working device having a function of excavating soil such as fields as shown in FIGS. It is possible. In the example shown in FIG. 7, the cultivating device 60 is provided for the working machine support frame 41 attached to the fork 21, and the disk-shaped member 61 of the cultivating device is rotated by the drive device 45.
Soil can be excavated by using the plowing blade member 63 provided on the disc-shaped member. As shown in FIG. 8, the plowing blade member 63 attached to the disc-shaped member 61 corresponds to two attachment holes 62 ... A method of inserting the protrusion and fixing with a nut can be used. Then, as shown in FIG. 7, by setting the tip end portion of the plowing blade member 63 from the disc-shaped member 61 to an arbitrary height, the dug depth of soil using the plowing blade member is arbitrarily set. can do.

Further, in the cultivating device, it is possible to adjust the digging depth by the cultivating blade member by lowering the fork 21, and digging using the cultivating device while moving the working vehicle forward or backward. When the above work is continuously performed, it can be used in the same manner as a conventional tiller. Further, in the tiller as shown in FIGS. 7 and 8, the tiller blade member is raised by an obstacle while excavating the soil by pushing down the tiller by the weight of the working device and the fork. When such a force is applied, the working device can be lifted together with the fork to automatically perform the operation of causing the device to escape from the obstacle, and it is possible to prevent damage to the tilling device.

As shown in FIG. 7, when the cultivating device is mounted on the working machine support frame 41, as shown in FIG.
As shown in, a plurality of tilling devices can be arranged in parallel. In the example shown in FIG. 9, the working machine support frame 41 supported by the two forks 21 and 21a of the working vehicle has three sets of tilling devices 60, 60a and 6a.
0b is arranged, and each cultivating device is separately driven by a hydraulic motor to form a cultivating device. Then, the working machine support frame 41 equipped with the three sets of tilling devices is attached to the forks, and the vehicle is moved while moving forward and backward, whereby the tilling work can be performed in a wide width. Since the vehicle equipped with the working machine support frame is equipped with a rubber crawler in the traveling part, even when the vehicle is traveling on rough ground after plowing, the traveling performance of the vehicle is hindered. It does not occur, and stable tilling work can be performed.

Further, as shown in FIG. 9, in addition to performing work by supporting the central portion of the working machine support frame with a fork, in the apparatus of the present invention, as shown in FIG. It is also possible to arrange a large number of fork insertion portions 42 ... With respect to the support frame 41 and insert the forks into any fork insertion portion to support the work machine support frame. For example, as shown in the figure, when the fork insertion portion is arranged on the working machine support frame so as to correspond to the distance between the two forks, the fork insertion portion 4
By inserting and fixing the forks 21 and 21a into 2 and 42b, respectively, to support the tilling device in a state of being biased to the side of the vehicle, and to perform a wide range of work for excavating soil by the tilling blade member. You can Further, the number of the disk-shaped members arranged on the working machine support frame can be set according to the output of the engine arranged on the drive unit of the vehicle, and therefore, the width can be set to any width depending on the capacity of the drive unit. And a device for tilling soil to a depth can be constructed. In addition to the above configuration, since the protruding height of the tilling blade member that is arranged to project below the working machine support frame can be arbitrarily set, it is possible to easily adjust the tilling depth and the width.
The method of mounting the work implement support unit on the fork shown in FIG. 7 can be applied to a mowing device and other work devices.

As shown in the example of the cultivating device, in addition to using the cultivating device constituted by protruding the cultivating blade member to the lower part of the disk-shaped member, in the present invention, as shown in FIG. It is also possible to configure the cultivating device 70 in which a large number of cultivating blade members are attached to the horizontal rotating shaft. The tilling device 7
In the example of No. 0, from the drive device 45 supported on the upper part of the work machine support frame 41, the shaft 7 is transmitted via the transmission device 73.
It is possible to transmit the driving force to No. 1 and rotate the plowing blade members 72 ... Attached to the shaft 71 to perform the work of excavating the ground. Further, with the above-described configuration, it is possible to configure a device for cultivating the ground so that the field or field can be cultivated as in the case of the conventional cultivator equipped with the tractor. Also, the tiller 70
A mud cover 74 can be arranged on the upper part of the rotary blade of the machine as necessary, and it is possible to prevent the soil excavated by the plowing blade member from causing a problem such as soiling the vehicle body and surroundings. .

[0026]

Since the work vehicle of the present invention constitutes the device as described above, a power generation device for converting all of the output of the engine into hydraulic pressure and outputting the oil pressure is provided and disposed in the traveling section. Even in the hydraulic pumps arranged for the respective rubber crawlers, the capacity of the hydraulic pumps is set so that the entire output of the engine can be used for traveling.
Therefore, in the work vehicle, when the vehicle is simply driven, the entire output of the engine can be used for running, and when the work device is operated while the work vehicle is stopped, the engine is Can be used as a driving force for the working device. Further, when operating the work device while the work vehicle is traveling at a low speed, it is possible to supply all of the output except the power used for traveling to the work device, so that the output of the engine is always output. It is possible to configure a device that performs work using 100%.

In the working vehicle of the present invention, the unit of the working device is arranged via the fork provided in the cargo handling device, and the disk-shaped member is driven by using the hydraulic motor of the working device. When a large resistance is applied to the fork, it is possible to prevent the working device from being damaged due to the fork itself moving upward. Further, the working device is optionally equipped with a device having a function such as a mowing device configured by attaching a cutting blade to a disc-shaped member, or a plowing device configured by providing a plowing blade member on the disc-shaped member. Therefore, it is possible to perform a work similar to that of the agricultural tractor device and a work as a fork device. Also, by providing a rubber crawler on the running part, it is possible to use the work vehicle for work in places where rubber wheels cannot run, such as on uneven terrain, and for use in general work places using the fork function. Is possible. Further, in the work vehicle in which the fork is equipped with the work device, the work device according to the function of the work device can be configured by mounting an arbitrary unit on the fork. It is possible to configure a device that performs all work using hydraulic pressure.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a work vehicle of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a power generation device for a work vehicle.

FIG. 3 is an explanatory diagram showing a schematic configuration of a cargo handling device provided in a work vehicle.

FIG. 4 is an explanatory diagram of a case where a working device mounted on a fork is configured as a mowing device.

5 is a plan view of the work device of FIG. 4. FIG.

FIG. 6 is a plan view of a mowing device arranged on the working device.

FIG. 7 is an explanatory diagram of a case where the working device is a cultivating device.

FIG. 8 is a plan view of a tilling device arranged in the working device of FIG. 7.

FIG. 9 is an explanatory view showing a state in which a large number of tilling devices are arranged on the working device.

FIG. 10 is an explanatory diagram of a state in which the work device is attached to the fork.

FIG. 11 is an explanatory view of another embodiment of the tilling device of the present invention.

[Explanation of symbols]

1 work vehicle, 2 vehicle body, 4 power generation device, 5 engine, 6-9 hydraulic pump, 10
Traveling section, 11 rubber crawlers, 20 cargo handling equipment, 21 forks, 22 fork frames, 28
Cylinder for tilting 32 Hydraulic cylinder, 40
Working device, 41 Working machine support frame, 42
Fork insertion part, 45 drive device, 46 hydraulic motor, 48 drive shaft, 50 mowing device, 51
Disc-shaped member, 52/61 mounting hole, 53 cutting blade, 60/70 cultivating device, 63/72 cultivating blade member.

Claims (5)

[Claims] 1. A work machine support frame to be mounted on a fork of a work vehicle, a hydraulically operated drive device provided on the work machine support frame, and a work device driven by the drive device as one unit. A power generation device that supplies hydraulic pressure to the drive device,
A work vehicle equipped with a work device on a fork, which is provided on the work vehicle. 2. The working device is composed of a mowing device, and the mowing device is composed of a large number of cutting blades projecting around a disk-shaped member, and the disk-shaped member is driven by a vertical shaft by a driving device. A work vehicle equipped with a work device for a fork according to claim 1, wherein the work device comprises a device for rotating the fork. 3. The working device comprises a cultivating device,
2. A device for arranging the plowing device on a lower surface of a disc-shaped member with a large number of plowing blade members projecting from the disc-shaped member and rotating the disc-shaped member via a vertical shaft by a driving device. A work vehicle equipped with a work device on the fork described in. 4. The power generation device arranged on the work vehicle includes a hydraulic pump for converting all of the output of the engine into hydraulic pressure to supply power to the work device, and a rubber crawler arranged on a traveling portion of the work vehicle. Drive 2
Two hydraulic pumps and a hydraulic pump for vertically moving the working device are arranged, and the two hydraulic pumps corresponding to the rubber crawlers of the traveling section are such that the outputs of the two hydraulic pumps convert the entire output of the engine into hydraulic pressure. The work vehicle, which is convertible and is used for traveling of the work vehicle, in which the fork is equipped with the work device. 5. A cargo handling device including a fork arranged at a front portion of a vehicle body, a work device supported by the cargo handling device, a power generating device including an engine arranged at a rear portion of the vehicle body, and a hydraulic motor arranged at a traveling portion. And a rubber crawler driven by a work vehicle, wherein the power generation device includes four hydraulic pumps for converting the output of the engine into oil pressure and outputting the oil pressure in series with the output shaft of the engine. One of the four hydraulic pumps is located at the position closest to the engine, and has the ability to convert all the output of the engine into hydraulic pressure to drive the working device. The two hydraulic pumps arranged to drive the crawlers can control their outputs individually, and each hydraulic pump is connected to the hydraulic motor via a line directly connected to the hydraulic pump. Working vehicle equipped with a working device in a fork, which comprises using as a driving source for the movement of the working device.