JP2578636Y2 - Work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a construction in which a hydraulic motor is driven by a hydraulic source from a hydraulic pump driven by an engine mounted on a vehicle so that the vehicle can be driven and a work machine is provided on the vehicle. The present invention relates to a work vehicle configured to be able to drive the working machine by a hydraulic source from the hydraulic pump.

[0002]

2. Description of the Related Art The prior art will be described by taking a crane truck as shown in FIG. 3 as an example of this type of working vehicle. The crane truck drives hydraulic motors 4, 4 by a hydraulic source from a hydraulic pump 3 driven by an engine 2 mounted on the vehicle 1 as shown in FIGS. The vehicle 1 is configured to be able to drive and travel, and the telescopic boom 6 is provided on the vehicle 1 so that the telescopic boom 6 can be raised and lowered and driven to expand and contract by a hydraulic source from the hydraulic pump 3.

A telescopic boom 6 has a first telescopic boom 8 having a post 7 rotatably mounted on the vehicle 1 and a base end pivotally supported by the post 7 so as to be able to move up and down, and a first telescopic boom. 8 is provided with a second telescopic boom 9 whose base end is pivotally supported so as to be able to move up and down. An undulating hydraulic cylinder 10 is arranged at an appropriate position between the first telescopic boom 8 and the post 7, and the first telescopic boom 8 can be driven to undulate with respect to the post 7. A bending hydraulic cylinder 11 is disposed at an appropriate position between the first telescopic boom 8 and the second telescopic boom 9 via a link, so that the second telescopic boom 9 can be driven to bend with respect to the first telescopic boom 8. The first telescopic boom 8 and the second telescopic boom 9 are each fitted with a plurality of booms so as to be extendable and retractable, and are provided with appropriate telescopic driving means (not shown) such as a telescopic hydraulic cylinder between the respective booms so that the telescopic drive can be performed. ing.

A winch 12 is arranged on the base end side boom of the first telescopic boom 8, and a wire rope 13 pulled out from the winch 12 is moved along the first telescopic boom 8 and the second telescopic boom 9 to form a second telescopic boom. The hook 14 is connected to the tip of the second telescopic boom 9 and the hook 14 is suspended from the tip of the second telescopic boom 9. When a crane operation is performed by the crane truck configured as described above, the crane operation is performed by appropriately moving the telescopic boom 6 up and down, raising and lowering, and turning, and operating the winch 12 to position the hook 14 at an appropriate position. It is.

In order to secure the stability of the vehicle 1 during the crane operation, the crane vehicle is provided with an outrigger device. The outrigger device includes a slide beam 15 having a base end attached to the vehicle 1 and extending from the side of the vehicle 1 and a jack 16 attached to a distal end of the slide beam 15. The base is arranged. Here, the slide beam 15 is the outer cylinder beam 15
a, and an inner cylinder beam 15b, which is telescopically inserted into the outer cylinder beam 15a.
A sliding hydraulic cylinder 17 is arranged between the outer cylinder beams 5b so that the inner cylinder beam 15b can be driven to expand and contract from the outer cylinder beam 15a. In this embodiment, the jack 16 is constituted by a hydraulic cylinder.
It will be described as.

The hydraulic cylinder for jack 16 and the hydraulic cylinder for sliding 17 are operable by operating a selection valve 18 and an outrigger operation switching valve 19. That is, the selection valve 18 is constituted by a four-port three-position switching valve. One of the ports is connected to the hydraulic pump 3 via the outrigger operation switching valve 19, and the other is connected to the tank 20. Connected. The other two have their ports connected to the extension-side oil chambers of the jack hydraulic cylinder 16 and the slide hydraulic cylinder 17, respectively. The outrigger operation switching valve 19 is constituted by a six-port three-position switching valve, two of which ports are connected to the carry-over oil passage 21, and the other three are a hydraulic pump 3, a tank 20, and the selection valve. 18, and the other one is connected to the reduced hydraulic chamber of the jack hydraulic cylinder 16 and the sliding hydraulic cylinder 17, respectively. FIG. 2 shows the hydraulic cylinder 16 for jack,
Although only one slide hydraulic cylinder 17 and one selection valve 18 are shown, the remaining three are similarly connected to the oil passage 22.

Next, a turning operation switching valve 23 for controlling and operating a turning hydraulic motor 25 for driving the post 7 to turn is provided.
The first hydraulic boom 8 is controlled by operating the undulating hydraulic cylinder 10.
Switching valve 24 for raising and lowering, a switching valve for bending operation for controlling the hydraulic cylinder 11 for bending and raising and lowering the second telescopic boom 9 (disposed after the oil passage 21a and not shown), A first telescopic operation switching valve (oil passage 21) that controls and operates a telescopic hydraulic cylinder that drives the telescopic boom 8 to expand and contract.
a, not shown), the second telescopic boom 9
Control operation of the telescopic hydraulic cylinder that drives the telescopic
A switching valve for expansion and contraction operation (disposed after the oil passage 21a and not shown) and a winch switching valve for controlling and operating the winch 12 (disposed after the oil passage 21a and not shown) are disposed. By appropriately operating the telescopic boom 6, the telescopic boom 6 is appropriately turned, raised and lowered, and expanded and contracted, and the winch 12 is operated to perform a crane operation.

The traveling switching valves 26, 2 for controlling the hydraulic motors 4, 4 when the crane truck travels.
6 are arranged. That is, the traveling switching valves 26, 26
Is constituted by a four-port three-position switching valve, one of the ports being connected to a hydraulic pressure source from the hydraulic pump 3 and the other being connected to the tank 20. The remaining two ports are connected to the supply / discharge ports of the hydraulic motors 4,4. By operating the traveling switching valves 26, 26,
The drive of the hydraulic motors 4 and 4 is controlled so that the vehicle 1 can be driven to travel via the crawlers 5 and 5.

The engine 2 is divided into a case in which the crane truck travels and a case in which the crane operation is performed.
The operation mode switching valve 27 is used to selectively switch the supply destination of the hydraulic power source from the hydraulic pump 3 driven by the hydraulic pump 3. The work mode switching valve 27 is constituted by a three-port two-position type electromagnetic switching valve. One of the ports is connected to an oil passage from the hydraulic pump 3, and the other is connected to the carry-over oil passage 21. The other one is a traveling operation switching valve 2
6 is connected. The operation of the traveling operation switching valve 26 can be activated by operating the work mode switching switch 29.

That is, the work mode switch 2
When the power supply 9 is turned on and the power from the battery 28 is supplied to the solenoid coil 27a of the work mode switching valve 27 via the work mode switch 29, the work mode switching valve 27 is switched so that the hydraulic pressure source from the hydraulic pump 3 is turned on. It is supplied to the traveling operation switching valves 26, 26. Conversely, when the work mode switch 29 is turned off and the power from the battery 28 is not supplied to the solenoid coil 27a of the work mode switch valve 27 via the work mode switch 29, the work mode switch valve 27 Is switched so as to supply the hydraulic pressure source from the hydraulic pump 3 to the carry-over oil passage 21 by the spring action disposed in the above.

On the other hand, the accelerator lever 30 of the engine 2
Is connected to one end of a swing lever 32 via an operation wire 31. Further, the rod 3 of the hydraulic cylinder 35 having the rod 34 constantly biased to one side by the return spring 33 is provided at the middle portion of the swing lever 32.
4 are connected to one end 34a.

The hydraulic cylinder 35 has a first oil chamber 35a.
And a second oil chamber 35b, and the first oil chamber 3
A first control valve 37 is connected to 5a via a first oil passage 36a, and a second control valve 38 is connected to the second oil chamber 35b via a second oil passage 36b. Each control valve 3
Reference numerals 7 and 38 denote three-port two-position switching valves provided with solenoid coils 39 and 40, respectively. The oil chamber 36a and the second oil chamber 36b can be alternatively connected to the hydraulic pump 3 via the pressure reducing valve 42.

More specifically, when the first oil chamber 35 a is connected to the hydraulic pump 3 and the second oil chamber 35 b is connected to the tank 20, the rod 34 acts on the urging force of the return spring 33. When the accelerator lever 30 moves in the direction of arrow A and the swing lever 32 rotates in the direction of arrow C, the accelerator lever 30 is operated in the direction of arrow E to increase the engine speed. On the other hand, when the first oil chamber 35a is connected to the tank 20 and the second oil chamber 35b is connected to the hydraulic pump 3, the rod 34 moves in the direction of arrow B, and the swing lever 32 moves in the direction of arrow D. By rotating in the direction, the pulling force on the operation wire 31 is released, so that the accelerator lever 30 is operated in the arrow F direction in which the engine speed is reduced by the spring force of the spring 43.

The engine rotation control means 41 detects a signal from the engine rotation adjustment means 44 for outputting an engine rotation adjustment signal by manual adjustment operation and an operating position of the hydraulic cylinder 35 and outputs a feedback signal. Upon receiving a signal from the operating position detector 52, a control signal is output to the solenoid coils 39 and 40 to control the operation of the hydraulic cylinder 35. Specifically, it receives a feedback signal from the operating position detector 52 as to whether or not the hydraulic cylinder 35 is located at a position corresponding to the signal from the engine rotation adjusting means 44. Coil 39, 4
0, a control signal is output as appropriate, and the hydraulic cylinder 35 is operated to the corresponding position.
The accelerator rotation control means 41 performs a control operation so as to stop the position 5 at that position. That is, the operator manually adjusts the engine rotation adjusting means 44 as appropriate to operate the hydraulic cylinder 35 in response to the adjustment signal output from the engine rotation adjusting means 44 to adjust the rotation of the engine 2. Is what it is.

In the crane truck constructed as described above, when the crane truck travels, the work mode changeover switch 29 is set to 0N to switch the work mode changeover valve 27, and the hydraulic pressure from the hydraulic pump 3 driven by the engine 2 is changed. The source is supplied to the traveling operation switching valve 26.
The traveling operation switching valve 26 is appropriately switched, the hydraulic motors 4 and 4 are rotated, and the crawlers 5 and 5 move the crane truck forward or backward at an appropriate speed. At this time, the rotation of the engine 2 is appropriately adjusted by manually operating the engine rotation adjusting means 44 and the hydraulic pump 3
The amount of oil discharged from the motor is adjusted, and the amount of oil supplied to the hydraulic motors 4 and 4 is adjusted to adjust the speed.

On the other hand, when the crane works, the work mode changeover switch 29 is set to 0FF, and the hydraulic source from the hydraulic pump 3 driven by the engine 2 is supplied to the carryover oil passage 21 without switching the work mode changeover valve 27. Let it do. And before the crane work,
First, the selection valve 18 is selected so as to operate the slide hydraulic cylinder 17, and the outrigger operation switching valve 19 is appropriately operated to extend the slide beam 15. Next, the selection valve 18 is selected so that the jack hydraulic cylinder 16 is operated, and the jack hydraulic cylinder 16 is extended by appropriately operating the outrigger operation switching valve 19 to extend the outrigger device so that the crane truck is supported on the ground. Also at this time, the rotation of the engine 2 is appropriately adjusted by manually operating the engine rotation adjusting means 44 to adjust the amount of oil discharged from the hydraulic pump 3, and the slide hydraulic cylinder 17, the jack hydraulic cylinder 1
The speed of the oil is adjusted by adjusting the amount of oil supplied to 6. When the outrigger device is stored, the above operation may be performed in reverse.

When the outrigger operation switching valve 19 is set to the neutral position, the oil discharged from the hydraulic pump 3 receives the turning operation switching valve 23, the up / down operation switching valve 24, and the bending operation switching valve (oil passage 21a). The first telescopic operation switching valve (disposed after the oil passage 21a and not shown), and the second telescopic hydraulic cylinder for controlling the second telescopic boom 9 to expand and contract are provided. Switching valve for expansion / contraction operation (oil passage 21
a), and are supplied to a winch switching valve (disposed after the oil passage 21a and not shown). By operating these switching valves appropriately, the telescopic boom can be used. 6 is driven to expand / contract, undulate, bend, and turn, and the winch 12 is operated to operate the hook 14.
Is positioned at an appropriate position to carry out crane work.
Then, similarly to the above, the rotation of the engine 2 is appropriately adjusted by manually operating the engine rotation adjusting means 44, and the hydraulic pump 3
The hydraulic oil for driving the hydraulic motor 25, the hydraulic cylinder for raising and lowering 10, the hydraulic cylinder for bending 11, the telescopic cylinder (not shown) for expanding and contracting the telescopic boom 6, and the hydraulic pressure for driving the winch It adjusts the amount of oil supplied to each of the motors (not shown) to adjust the speed thereof.

[0018]

However, the conventional work vehicle constructed as described above has the following problems. That is, as described above, the rotation of the engine 2 is controlled by the engine rotation control unit 41 based on the manual adjustment from the engine rotation adjustment unit 44 in both the case where the crane truck travels and the case where the crane work is performed. The operation is performed by operating the accelerator lever 30 via the hydraulic cylinder 35. Therefore, when the engine rotation control means 41 breaks down, the rotation control of the engine 2 becomes impossible, so that not only the crane operation but also the traveling movement of the crane vehicle cannot be performed. Therefore, in order to repair the failure, it is necessary to take measures such as sending a service person to the failure site and repairing it, or mounting a crane truck on another vehicle and transporting it to a service factory for repair. there were. The present invention focuses on the above problems, and
It is an object of the present invention to provide a working vehicle capable of only moving the vehicle on its own even if it fails.

[0019]

In order to achieve the above object, the work vehicle of the present invention drives the vehicle by driving a hydraulic motor by a hydraulic source from a hydraulic pump driven by an engine mounted on the vehicle. A hydraulic cylinder, which is configured to be capable of driving the work machine by a hydraulic source from the hydraulic pump and having a work machine on the vehicle, wherein the hydraulic cylinder is connected to an accelerator of the engine to operate the accelerator of the engine. An engine rotation adjusting means for outputting an engine rotation adjustment signal by manual adjustment, an operation position detector for detecting an operation position of the hydraulic cylinder and outputting a feedback signal, and receiving the adjustment signal and the feedback signal In a work vehicle provided with engine rotation control means for outputting a signal for controlling the drive of the hydraulic cylinder, Traveling state detecting means for detecting that both are in the traveling state, and an engine capable of traveling and moving the working vehicle by directly controlling the hydraulic cylinder when the traveling state detecting means detects that the work vehicle is in the traveling state A second engine rotation adjusting means for rotating the engine is provided.

[0020]

In the work vehicle according to the present invention having the above-described structure, when the traveling state detecting means detects that the work vehicle is in the traveling state, the hydraulic cylinder is directly controlled by the second engine rotation adjusting means to control the work vehicle. Since the traveling vehicle can be made movable, the traveling vehicle can travel by controlling the rotation of the engine by the second engine rotation adjusting unit without using the engine rotation adjusting unit when traveling the work vehicle. Therefore, even if the engine rotation control means breaks down, the work vehicle can be moved without any trouble.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work vehicle according to the present invention will be described below with reference to FIG. 2 and 3
In the following description, the same reference numerals are used for the components other than the reference numeral 41 shown in FIG. Therefore, a detailed description of these symbols is omitted.

First, in describing the embodiment according to the present invention, it is explained that the rotation of the engine 2 is generally set as follows. In other words, the rotation of the engine required when traveling and moving the work vehicle requires higher torque than the rotation of the engine required during crane operation, and therefore requires high rotation. In other words, when determining the capacity of the engine mounted on the work vehicle, it is determined from the torque required when the work vehicle travels. Therefore, when the hydraulic cylinder 35 is operated up to the stroke end in the direction of the arrow A, the rotation of the engine 2 becomes substantially the maximum rotation (for example, 30 rotations).
00 rpm), and when the vehicle 1 travels, the hydraulic cylinder 35 is operated to the stroke end to operate the engine 2 so that the rotation of the engine 2 becomes almost the maximum.

Reference numeral 45 denotes an outrigger operation detecting means which comprises a potentiometer, a limit switch and the like, and detects that the outrigger operation switching valve 19 has been operated. 4
Reference numeral 6 denotes a turning operation detecting means that includes a potentiometer, a limit switch, and the like, and detects that the turning operation switching valve 23 has been operated. 47 is a potentiometer,
A directional control valve 24 for undulating operation
Is an undulating operation detecting means for detecting that the user has operated the button.
Similarly, although not shown, a detecting means for detecting that the switch has been operated is also disposed in each of the bending operation switching valve, the first telescopic operation switching valve, the second telescopic operation switching valve, and the winch switching valve. ing.

Reference numeral 48 denotes engine rotation control means.
The following functions are added to those described in the related art. That is, when an operation signal is received from the outrigger operation detection means 45, the engine rotation control means 4
8 outputs to the solenoid coils 39 and 40 that the maximum rotation of the engine 2 is a predetermined rotation value (for example, 2500).
(rpm) or less. When an operation signal is received from a detecting means for detecting that each of the switching valves, such as the turning operation detecting means 46 and the undulating operation detecting means 47, is operated, the solenoid coils 39, 40 are received from the engine rotation adjusting means 48. Are controlled so that the maximum rotation of the engine 2 is output only at a predetermined rotation value (for example, 2000 rpm) or less. Therefore, even if the engine speed is manually adjusted to the maximum engine speed by the engine speed adjusting means 44, the above operation can be performed only at a predetermined value or less.

Reference numeral 49 denotes second engine rotation adjusting means, which comprises a switch 50 and a relay 51. The relay 51 is connected to the battery 28 via a series circuit of the switch 50 and the work mode switch 29. Therefore, the relay 51 is operated by turning on the work mode changeover switch 29 and turning on the switch 50. Here, the work mode changeover switch 29 is a switch that is turned on when the work vehicle travels as described above, and is a running state detecting means (a utility model registration claim) that detects that the work vehicle is in the running state. ). (In the following description, the operation mode switch 29 will be described.)

Reference numeral 51b1 denotes a normally closed contact of the relay 51, which is inserted in the middle of an electric circuit for transmitting an output signal from the engine rotation control means 48 to the solenoid coil 39.
51Ra is a normally open contact of the relay 51 and has one end connected to the solenoid coil 39 and the other end connected to the battery 28. 5
1Rb2 is a normally closed contact of the relay 51, and is inserted in the middle of an electric circuit for transmitting an output signal from the engine rotation control means 48 to the solenoid coil 40.

The work vehicle thus constructed according to the present invention operates as follows. First, when moving the crane truck, the work mode switch 29 is turned on. Then, the operation mode switching valve 27 is switched, and the discharge oil from the hydraulic pump 3 is supplied to the traveling operation switching valves 26, 26, and the hydraulic motors 4, 4 are driven by operating the traveling operation switching valves 26, 26. The crane truck travels via the crawlers 5 and 5. At this time engine 2
The rotation of can be made approximately the maximum rotation by turning on the switch 50.

That is, when the switch 50 is turned on,
Activate the relay 51 and relay contacts 51Rb1, 51Rb
Since 2 is opened and 51Ra is closed, the power of the battery 28 is supplied to the solenoid 39, and the output signal from the engine rotation control means 48 is not transmitted to the solenoid 38. Therefore, the first control valve 37 switches and supplies the hydraulic pressure source from the hydraulic pump 3 to the first oil chamber 35a of the hydraulic cylinder 35 via the first oil passage 36a. Since the second control valve 38 is not switched, the hydraulic cylinder 35
The oil in the second oil chamber 35b is released to the tank 20 via the second oil passage 36b, and the rod 34 of the hydraulic cylinder 35 is moved in the direction of arrow A. As a result, the swing lever 32 is moved to the arrow C
And the accelerator lever 30 is rotated in the direction of arrow E via the operation wire 31 to increase the rotation of the engine 2.

When the work vehicle travels, the switch 50 is set to the ON state, so that the state in which the hydraulic cylinder 35 is moved only in the direction of arrow A is maintained, and the hydraulic cylinder 35 is moved in the direction of arrow A. Then, the stroke end state is maintained. That is, the engine 2 is set to a state where the engine 2 is set to a substantially maximum rotation. When the work vehicle travels in this manner, the engine 2 is controlled by the second engine rotation adjusting means 49.
The travel of the vehicle is adjusted by adjusting the rotation of the vehicle.

Next, the case of crane work will be described. In this case, since the work mode changeover switch 29 is turned off and the work mode changeover valve 27 is not changed over, the discharge pressure from the hydraulic pump 3 is changed to the carry-over oil passage 21.
To supply. By operating the outrigger operation switching valve 19, the outrigger device is extended and retracted. Further, a switching valve 23 for turning operation, a switching valve 24 for raising / lowering operation, a switching valve for bending operation (disposed after the oil passage 25 and not shown), and a first expansion / contraction operation switching valve (disposed after the oil passage 25). (Not shown), a second telescopic operation switching valve (oil passage 2) for controlling and operating a telescopic hydraulic cylinder for driving the second telescopic boom 9 to expand and contract.
5 and thereafter (not shown) and a winch switching valve (disposed after the oil passage 25 and not shown) to operate the crane.

At this time, since the switch 50 is turned off, the relay 51 does not operate and the relay contact 5
1Rb1 and 51Rb2 are closed and the relay contact 51Ra is opened. Accordingly, the rotation of the engine 2 is manually adjusted by the engine rotation adjusting means 44 in the same manner as described in the related art, and a signal is output from the engine rotation controlling means 48 to control the hydraulic cylinder 35 to operate. . In this case, even if the user forgets to turn off the switch 50, the relay 51 does not operate because the work mode changeover switch 29 is always turned off when performing crane work. In other words, the switch 50 is not necessarily required, and the relay 51 may be operated in conjunction with the work mode changeover switch 29.

With the above-described operation and configuration, even if the engine rotation control means 48 fails and the engine rotation adjusting means 44 cannot adjust the rotation of the engine 2, the second engine rotation The rotation of the engine 2 can be adjusted by the adjusting means 49, and only traveling movement can be made possible.

In the above embodiment, the work mode switching valve 27 is switched between the traveling movement and the crane operation to supply the discharge oil from the hydraulic pump 3 to the respective operation switching valves. Alternatively, the traveling operation switching valve 26 may be inserted between the hydraulic pump 3 and the outrigger operation switching valve 19 without using the work mode switching valve 27. In this case, a carry-over circuit may be provided so that the oil discharged from the hydraulic pump 3 is supplied to the outrigger operation switching valve 19 at the neutral position of the traveling operation switching valve 26. Therefore, the hydraulic circuit is configured to give priority to traveling movement over crane operation. The present invention can be implemented even with the hydraulic circuit configured as described above. That is, the operation of the traveling operation switching valve 26 is detected by a detector (traveling state detecting means described in the utility model registration claims) consisting of a switch or the like, and the relay 51
Should be activated.

Further, in the above-described embodiment, the vehicle which can travel and move by driving the crawler by the hydraulic motor has been described.
Needless to say, the vehicle may be a vehicle that travels by driving a wheel by a hydraulic motor. Furthermore, in the above-described embodiment, the crane truck having a crane as a working machine has been described as an example. However, an aerial work machine having a telescoping boom, a digging machine having an auger drill disposed on the telescoping boom, and an excavator having no telescopic boom. It is needless to say that the present invention can be implemented in a similar manner even if the work machine has such a working machine.

[0034]

[Effect of the Invention] The work vehicle of the present invention configured and operated as described above can only move and move the vehicle by itself even if the engine rotation control means fails. Therefore, when repairing a failure, it is necessary to avoid a situation in which a service person needs to be repaired at the failure site, or a situation where the work vehicle is mounted on another vehicle and transported to a service factory for repair. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating a work vehicle of the present invention.

FIG. 2 is an explanatory view illustrating a conventional work vehicle.

FIG. 3 is an explanatory diagram illustrating a crane truck as an example of a work vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Hydraulic pump 4 Hydraulic motor 6 Telescopic boom 29 Running state detecting means 30 Accelerator 35 Hydraulic cylinder 44 Engine rotation adjusting means 52 Operating position detector 48 Engine rotation controlling means 49 Second engine rotation adjusting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B66C 23/00-23/94 F02D 11/06

Claims (1)

(57) [Scope of request for utility model registration] A hydraulic motor is driven by a hydraulic source from a hydraulic pump driven by an engine mounted on a vehicle so that the vehicle can be driven to travel, and a working machine is provided on the vehicle and hydraulic pressure from the hydraulic pump is provided. A work vehicle configured to be able to drive the work machine by a source, comprising: a hydraulic cylinder connected to an accelerator of the engine for operating the accelerator of the engine; and engine rotation adjustment for outputting an adjustment signal of the engine rotation by manual adjustment. Means, an operating position detector that detects an operating position of the hydraulic cylinder and outputs a feedback signal, and an engine rotation control unit that receives the adjustment signal and the feedback signal and outputs a signal for driving and controlling the hydraulic cylinder. Running state detecting means for detecting that the working vehicle is in a running state; A second engine rotation adjusting means for directly controlling the hydraulic cylinder to rotate the work vehicle so that the work vehicle can travel and move when the traveling state detecting means detects that the work vehicle is in the running state. And working vehicle.