JPH06141601A - Working car - Google Patents

Abstract

PURPOSE:To provide a working car capable of arbitrarily switching right and left running wheels from a working state of differential motion to a non-working state by a remarkably ready operation. CONSTITUTION:A working machine 3 is connected to the body unit 2 and the body unit is equipped with a prime mover 7 for driving this working machine 3, a pair of right and left running wheels 6, a clutch unit for connecting and disconnecting power transmission from the prime mover 7 to the working machine 3 and the running wheels 6 and with a differential motion brake unit for stopping the differential motion function of the above-mentioned differential motion units. A working car 1 is equipped with a handle 4 extending from the body unit 2 in the rear and upper directions and the handle 4 is equipped with a handle bar 20 extending in the left and right directions at the rear end part and has a loop shape. A clutch lever 78 is vertically shakably attached to the upper part of the handle 4 so as to parallel to the handle bar 20 at the lower position of shaking. The differential motion brake lever 75 is vertically shakably attached to the lower side of the handle 4 so as to be parallel to the handle bar 20 at the upper position of shaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main body portion for connecting a working machine such as a tilling rotary to a prime mover for driving the working machine.
A traveling wheel that is driven by the prime mover is provided, and a worker who walks the main body section that runs by the traveling wheel by following the steering wheel is steered from the main body section through a handle extending long rearward and upward. Therefore, the present invention relates to a work vehicle for performing various works.

[0002]

2. Description of the Related Art A work vehicle (land leveling machine) of this kind is described in, for example, Japanese Patent Laid-Open No. 62-146731. In this work vehicle, a plow shaft having a plow claw planted behind a main body. A working machine (working apparatus) having the above is connected, and the cultivating shaft is driven by an engine mounted on the main body. The body portion is also provided with a pair of left and right traveling wheels, and these traveling wheels are driven from the engine via a differential gear device.

However, at the time of a straight traveling work, it is difficult to move straight when the differential gear device is differential due to a difference in running resistance between the left and right wheels, and therefore a stop mechanism for stopping the differential of the differential gear device is provided. Then, the working machine is provided with an operating portion that operates by grounding at the time of working, and when this operating portion is in the grounded state, the stop mechanism is set to the stop side, and conversely, when the operating portion separates from the ground, In order to release the stop, an interlocking mechanism that interlocks the stop mechanism with the operating portion is provided.

Therefore, in this work vehicle, the differential of the differential gear device is always stopped at the time of work, and the straight traveling is maintained even if the running resistances of the left and right vehicles differ. By raising the working machine side during turning, the differential portion is automatically released by moving the operating part away from the ground, so that the left and right wheels can be differentially turned to facilitate turning.

Further, in such a work vehicle, a clutch lever is usually provided below the grip portion at the rear end of the steering wheel, as shown in Japanese Utility Model Laid-Open No. 60-130138.

[0006]

[Problems to be Solved] As described above, a system in which a differential stop mechanism is interlocked with an actuating part that operates by grounding is convenient because differential stop and stop release are automatically performed. On the other hand, there is an inconvenience that it is not possible to stop and release the stop arbitrarily, which is inconvenient, for example, when it is necessary to perform work while curving. Therefore, the present invention is intended to provide a work vehicle in which differential stop and stop release can be manually performed and the operation thereof is extremely simple.

[0007]

A working vehicle according to the present invention comprises a main body for connecting a working machine, a prime mover for driving the working machine, and a left and right side driven by the prime mover via a differential device. A pair of traveling wheels, a clutch device for connecting and disconnecting power transmission from the prime mover to the working machine and traveling wheels, and a differential stop device for stopping a differential function of the differential device, and In a work vehicle having a handlebar extending rearward and upward from a main body, the handlebar is formed in a loop shape having a handlebar extending in the left-right direction at a rear end thereof, and a differential stop connected to the differential stop device. A lever is provided below the handle so that it can swing up and down and along the handle bar at an upper swing position, and the differential stop lever is biased downward and at the upper swing position. Characterized by the differential stop device inoperative.

An operator puts his / her hand on a handlebar extending in the left-right direction at the rear end of the handle and grasps the handlebar from above, and steers the vehicle through the handlebar. It is located under the handlebars and can be moved freely. On the other hand, on the lower side of the handlebar, a differential stop lever is provided so as to be vertically swingable and along the handlebar in the upward swinging position. Can be operated extremely arbitrarily.

However, during normal straight-ahead work, the thumb is not hooked on the differential stop lever, and the lever is kept open. Since the lever is urged downward, it occupies the downward swing position, and the differential stop device connected thereto is in the operating state, that is, the differential function of the differential device is stopped. Therefore, the left and right traveling wheels rotate integrally without being differential, and good straight running performance can be obtained.

When turning, if the thumb of the hand holding the handlebar pulls the differential stop lever toward the handlebar, the differential stop device becomes inoperative, and the left and right traveling wheels are actuated by the differential device. As a result, good turning performance can be obtained. This operation is extremely easy, and even if you want to raise the working machine side at the end position of the straight work path to change the traveling direction by 180 °, or if you want to change the traveling direction during work, use one thumb to move both wheels. It is possible to ensure a smooth turning by making it differential, and after turning, it is very easy to return both wheels to the non-differential state by simply releasing the thumb from the differential stop lever, and good straightness. Can be secured.

Further, a clutch lever connected to the clutch device is provided on the upper side of the handle so as to be vertically swingable and along the handle bar at a lower swing position, and the clutch lever is attached upward. When the clutch device is energized and is brought into the connected state in the downward swing position, the clutch lever and the handle bar, which are pushed down to the downward swing position and along the handle bar, are grasped together from above, and the clutch The vehicle can be steered via the steering wheel while maintaining the connected state of the device. However, even in this case, the thumb holding the clutch lever and the handlebar from above is located under the handlebar and can be moved freely. It is extremely easy to operate.

By providing U-shaped portions projecting rearward at both left and right ends of the handlebar of the handle, it is convenient to grasp the handlebar with one hand and the U-shaped portion with the other hand. It is possible to control the main body. Furthermore, when cultivating on relatively hard soil, it is rare that so-called dashing occurs in which the traveling speed suddenly increases due to a change in ground resistance, but in such a case, the hand holding the handlebar should be used. Dashing can be effectively dealt with by releasing the clutch lever to release the drive of the operating wheel and stop the progress of the work vehicle due to the inertia by the hand holding the U-shaped portion. .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is an overall side view of a work vehicle 1 according to the present invention, and FIG.
Is a plan view thereof. In this work vehicle 1, a working machine 3 for tilling is connected to a rear portion of a main body 2, and a handle 4 and a chain lever 5 extend from the main body 2 rearward and upward.

The main body 2 has a pair of left and right traveling wheels 6,
An engine 7 is mounted above the fuel tank 8 together. The crankshaft 9 of the engine 7 is arranged vertically. A transmission case 11 is connected to a lower portion of the engine 7 via a clutch case 10, and engine power is transmitted to a speed change transmission mechanism in the transmission case 11 via a clutch device in the clutch case 10 as described later. It Then, the left and right traveling wheels 6 are driven via the speed change transmission mechanism.

The missile case 11 extends rearward between the left and right traveling wheels 6, and the tilling rotary pawl 12 of the working machine 3 is pivotally supported at the rear end portion thereof. This tilling rotary pawl 12 is also driven by the power of the engine 7 through the variable speed transmission mechanism.
The upper part of the cultivating rotary claw 12 is covered with a cover 13, and the rear part thereof is covered with a rear cover 15 pivotally supported by the cover 13 so as to be vertically swingable and provided with a flat plate 14 at its lower end. 16 is a tail wheel for adjusting the vertical position of the working machine.

A front end of the handle 4 is pivotally supported on the upper surface of the mission case 11 by a bolt 17, and a little behind it, an angle is fixed by a fixing mechanism 19 to an upper end of a bracket 18 protruding from the upper surface of the mission case 11. Adjustably fixed. As shown in FIG. 2, the handle 4 has handlebars 4a and 4b on the left and right sides, which extend rearward from the front portion with a small gap between them and extend leftward and rightward, with their rear ends extending in the left-right direction. U-shaped portions 21 that are formed in a loop shape connected via 20 and project rearward are provided at both left and right end portions of the handlebar 20. Workers typically use one hand on the handlebar 20
Then, the other hand is hung on one of the U-shaped portions 21 and the steering wheel 4 steers and steers the main body 2 while walking along the main body 2 which is self-propelled by the traveling wheels 6.

The change lever 5 penetrates the guide groove 22a of the change guide 22 and extends into the mission case 11. By operating the change lever 5, the shift stage of the shift transmission mechanism is appropriately selected.

FIG. 3 is a longitudinal sectional view of the clutch device 23 housed in the clutch case 10, and FIG. 4 is a top view thereof. The clutch device 23 integrally incorporates a speed reducing mechanism including a planetary gear device. That is, the sun gear is attached to the lower end of the crankshaft 9 which penetrates the crack case 10 from above.
24 are engraved. Around the sun gear 24, three planetary gears 25 that mesh with the sun gear 24 are arranged at equal intervals. Each planetary gear 25 is fixed to a clutch output shaft 26, rotatably supported on a drive plate 27 via a shaft 28, and meshes with a common ring gear 29 on the outside.

The ring gear 29 is formed on the inner peripheral surface of a flange portion 30a provided at the lower end of the cylindrical crack outer 30 so as to project inward in the radial direction. The clutch outer 30 is supported by the clutch case 10 so as to be rotatable around the axis of the crankshaft 9. A clutch inner 31 having a bottomed cylindrical shape is provided inside the clutch outer 30 and concentrically therewith. The bottom portion 31a of the clutch inner 31 engages with the three shafts 28, so that the clutch inner 31 rotates integrally with the planetary gear 25 and the drive plate 27 about the axis of the crankshaft 9.

A pair of arcuate clutch shoes 32 are planted at one end in the clutch case 10 in an annular space formed between the cylindrical wall of the clutch outer 30 and the cylindrical wall of the clutch inner 31. It is pivotally mounted on the pin 33
The pair of clutch springs 34 urge the two toward each other. A driven shaft supported by the clutch case 10 is provided between the opposite ends of the clutch shoes 32.
A flat plate-shaped cam 36 formed at the lower end of 35 is provided,
When the driven shaft 35 rotates and the cam 36 pushes open the end faces of the clutch shoes 32, 32, the clutch shoes 32, 32 expand relative to each other around the pin 33, and the friction piece 37a provided on the outer periphery of the clutch shoes 32, 32 spreads. The crack outer 30 is fixed to the clutch case 10 by frictionally engaging the inner peripheral surface of the clutch outer 30. When the crack outer 30 is fixed, the planetary gear 25 revolves around the shaft 28 while revolving around the shaft 28, and this revolution is taken out to the clutch output shaft 26 via the drive plate 27. That is, the clutch device 23 is in the connected state. The rotation of the crankshaft 9 is transmitted to the clutch output shaft 26 after being decelerated by the planetary gear device.

When the cam 36 is disengaged between the end faces of the clutch shoes 32, 32, the clutch shoes 32, 32 contract and close each other about the pin 33 by the clutch spring 34.
Through the friction piece 37b provided on the inner circumference, the clutch inner 31
The clutch inner 31 is fixed to the clutch case 10 by frictionally engaging the outer peripheral surface of the. Therefore, the clutch inner 31
The clutch output shaft 26, which is coupled via the drive plate 27 and the drive plate 27, is also fixed to the clutch case 10, and the rotation of the crankshaft 9 is transmitted to the clutch outer 30 via the planetary gear 25 that rotates, and It cannot be transmitted to the output shaft 26. That is, the clutch device 23 is in the disengaged state.

The driven shaft 35 is connected to a drive shaft 38 supported by the clutch case 10 adjacent to the driven shaft 35 via a pair of gears 39, and is driven by an arm 40 provided at the upper end of the drive shaft 38.
By rotating 38, the cam 36 rotates to connect or disconnect the clutch device 23.

FIG. 5 is a sectional view showing the speed change transmission mechanism 41 housed in the transmission case 11. Mission case
The front of 11 has a main shaft that extends parallel to the left-right direction.
42, a counter shaft 43, and left and right axles 44, 45 are sequentially arranged from front to back. A drive bevel gear 47 provided on a mission input shaft 46 splined to the clutch output shaft 26 meshes with a driven bevel gear 48 fixed to the main shaft 42.

A gear G ₁ is fixed to the main shaft 42. Meanwhile, sprocket gear G ₂ to a sleeve 49 rotatably fitted on the counter shear shift 43 is secured to the slidably are splined, and the sleeve 49
A chain 52 is stretched between 50 and a sprocket (not shown) provided on a rotary shaft 51 (FIG. 1) of the cultivating rotary 12. When the gear G ₂ is slid by the fork 53 interlocked with the chain lever 5 and engaged with the gear G ₁ , power is transmitted from the main shaft 42 to the gear G ₁ , the gear G ₂ , the sleeve 49, the sprocket 50 and the chain 52. After that, it is transmitted to the tilling rotary claw 12.

A gear G ₃ is also slidably spline-coupled to the main shaft 42 by a fork 54 which is interlocked with the chain lever 5, and to the counter shaft 43.
The gear G ₄ and the gear G ₅ are fixed, and the gear G ₆ is rotatably mounted. The gear G ₆ is integrally provided with the gear G ₇ . Further mounted rotatably gear G ₈ is the axle 45, the gear G ₉ in the gear G ₈ are integrally formed. The gear G ₈ meshes with the gear G _5, and the gear G ₉ meshes with the gear G ₆ . The gear G ₇ meshes with a gear G ₁₀ fixed to a differential gear box 56 of a differential device 55 described later.

Therefore, when the gear G ₃ is slid and engaged with the gear G ₄ , the power is sequentially transferred from the main shaft 42 to the gear G 4.
₃ , gear G ₄ , gear G ₅ , gear G ₈ , gear G ₉ , gear G
₆ , the gear G ₇ , and the gear G ₁₀ are transmitted to the differential gear box 56, and when the gear G ₃ is engaged with the gear G ₆ , power is transmitted from the main shaft 42 to the gear G ₃ , the gear G ₆ , and the gear G ₆ . ₇ , through gear G ₁₀ and transmitted to differential gearbox 56, thus forward 1
The first gear and the second forward gear are established.

Furthermore, a sprocket 57 for reverse at the right end of Meinshiyafuto 42 is loosely fitted, the gear G ₃ is splined and which when slid to the right, and Meinshiyafuto 42 via the gear G ₃ Unify. A chain 59 is stretched between the sprocket 57 and the sprocket 58 fixed to the counter shaft 43, and when the gear G ₃ is engaged with the sprocket 57 by the fork 54, the rotation of the main shaft 42 is transmitted through the chain 59. It is transmitted to the main shaft 43, and then gear G ₅ , gear G ₈ , gear G ₉ , gear G ₆ , gear G.
_7, is transmitted to the differential gear box 56 via a gear G _10, differential gear box 56 rotates in the reverse direction.

The differential device 55 is an ordinary differential gear device, and is mounted on the differential gear box 56 pivotally supported by the transmission case 11 via bearings 60, and via the differential pinion shaft 61. 62 is pivotally attached, and the opposite left and right large differential gears 63 mesh with the small differential gear 62. The left and right differential gears 63 are fixed to the inner ends of the left and right axles 44, 45, respectively, and the rotational force transmitted to the differential gear box 56 as described above is applied to the left and right axles 44, 45. Evenly distributed, when the work vehicle 1 turns, the left and right traveling wheels 6 respectively attached to the axles 44, 45 are differentially provided, and good turning performance is obtained.

However, when the traveling wheels 6 on the left and right are differentially driven due to the difference in traveling resistance during the straight traveling work, it becomes difficult to travel straight, and when the traveling resistance of one of the traveling wheels 6 decreases, the total transmission torque decreases. A differential stop device 64 is provided to stop the differential function of the differential device 55 according to the running situation, because inconveniences such as reduced running performance occur. The operation stopping device 64 is a shifter 65 slidably engaged with the left axle 44 and meshable with the left end surface of the differential gear box 56.
And the shifter 65 meshes with the differential gear box 56,
When the left axle 44 is coupled to the differential gear box 56 via the shifter 65, the left axle 44, the differential gear box 56 and the right axle 45 rotate together.

The shifter 65 is a differential gear box with a spring 66.
Since it is biased to the meshing position with 56, the differential function of the differential device 55 is normally stopped, and work is performed in this state. A rotary shaft 67 that penetrates the wall of the mission case 11 in the front-rear direction is provided in front of the shifter 65, and a protrusion 69 provided at the tip of an arm 68 fixed to the rear end of the rotary shaft 67. Engage with the circumferential groove 65a of the shifter 65 (FIG. 6). Therefore, by rotating the rotating shaft 67, the shifter 65 is retracted against the spring 66, and the meshing with the differential gear box 56 is disengaged, so that the differential device 55 can be brought into a differential state. it can.

One end of a lever member 70 is fixed to the front end of a rotary shaft 67 protruding from the mission case 11,
A wire 71 connected to the other end of the lever member 70 swings the lever member 70 to rotate the rotating shaft 67. The lever member 70 may be further biased by a spring 72 to assist the biasing force of the spring 66. The wire 71 is passed through the transmission case 11 and an outer tube 73 that is appropriately fixed to the handle 4, and extends along the handle 4 to the rear end portion.

As shown in FIGS. 7 and 8, the handlebar 20 at the rear end of the handle 4 is provided with a differential stop lever 75 on its lower side through a bracket 74 so as to be vertically swingable, The other end of the wire 71 is connected to the differential stop lever 75. The differential stop lever 75 swings up and down in a vertical plane including the handle bar 20, and when in the upward swing position,
Along the handlebar 20 as shown in. Since the urging force of the springs 66 and 72 acts on the wire 71, the differential stop lever 75 is urged downward by the wire 71, and normally the lower position is set as shown in FIG. is occupying. However, it is also possible to swing the lock lever 76 to lock the differential stop lever 75 in the upward swing position by the lock lever 76.

A throttle lever 77 and a clutch lever 78 are swingably provided on the upper rear side of the handle 4. The clutch lever 78 has a U-shape as shown in FIG. 2, both ends of which are pivotally attached to the left and right handle portion pieces 4a and 4b, respectively, and the rear upper portion thereof extends in the left-right direction in parallel with the handle lever 20. It is a portion 78a. The clutch lever 78 is connected to the arm 40 of the clutch device 23 described above through a wire (not shown) similar to the wire 71,
It is biased by the clutch spring 34 and normally occupies the upper swing position as shown in FIG. Clutch device 23
As you can see from the above description regarding the clutch lever
When 78 is in this upper swing position, clutch device 23 is in the disengaged state.

When the clutch lever 78 is swung downward, the arm 40 is interlocked with this, and the drive shaft 38, the driven shaft 35, the cam
The clutch shoe 32 expands via 36 and the clutch outer
Since the clutch device 23 is fixed and the clutch device 23 is in the connected state, the main body portion 2 starts traveling. In the downward swinging position of the clutch lever 78, as shown in FIGS. 2 and 7, the rod-shaped portion
78a runs along the handlebar 20 so that the operator can
The rod-shaped portion 78a can be grasped together with the handlebar 20 from above, and the main body 2 can be steered and steered via the handle 4 while maintaining the connected state of the clutch device 23.
Since U-shaped portions 21 project rearward on both sides of the handlebar 20, one hand holds the clutch lever 78 and the handlebar 20 as described above, and the other hand holds the U-shaped portion.
By gripping 21, the main body 2 can be operated extremely conveniently and easily.

In the case of tilling on relatively hard soil, so-called dashing in which the traveling speed unexpectedly increases due to a change in ground resistance during the work as described above rarely occurs, but in such a case, The clutch lever 78 is released by releasing the hand holding the handlebar 20, the drive of the traveling wheels 6 is shut off, and the hand holding the U-shaped portion 21 advances by inertia of the main body 2. By stopping
Can deal with dashing effectively.

In the state of FIG. 7, the differential stop lever 75
Is released and occupies a downward swing position as shown in the figure, and the differential stop device 64 connected to this via a wire 71 has a differential stop in which a shifter 65 meshes with an end face of a differential gear box 56. Is in a state. Therefore, the left and right traveling wheels 6 rotate integrally without being differential, and good straight running performance can be obtained.

However, the thumb 79a of the hand 79 is the handlebar 20
Since the handlebar 20 and the clutch lever 78 can be freely moved while being held, the differential stop lever 75 can be easily operated with the thumb 79a. As shown in FIG. 8, by pulling the operation stop lever 75 with the thumb 79a and moving it along the handlebar 20,
Since the differential stop device 64 is in an inoperative state, that is, the shifter 65 is disengaged from the differential gear box 56 and the left and right axles 44, 45 can be freely differentiated, the left and right wheels can be differentiated with one thumb. It is possible to make it possible to make a smooth turning, and after turning, it is extremely easy to return both wheels to the non-differential state by simply releasing the thumb from the operation stop lever 75, and good straightness is achieved. Can be secured.

[0038]

As described above, according to the present invention, the left and right traveling wheels can be manually set to a differential state or a non-differential state while the work vehicle is operating, which is good according to the work situation. It is possible to secure excellent turning performance or straight running performance, and the operation is extremely simple. Further, when the hand is released from the handle, the main body stops and the differential device also stops the differential function, so that the main body does not swing due to its own weight, inertia force, etc., and the handle does not shake.

[Brief description of drawings]

FIG. 1 is an overall side view of a work vehicle according to the present invention.

FIG. 2 is a plan view of the work vehicle.

FIG. 3 is a vertical cross-sectional view of a clutch device.

4 is a sectional view taken along the line 1V-1V in FIG.

5 is a cross-sectional view substantially along the line VV in FIG.

FIG. 6 is a front view of the differential stop device.

FIG. 7 is a rear view showing the differential stop lever in the downward swing position.

FIG. 8 is a rear view showing the differential stop lever in the upper swing position.

[Explanation of symbols]

G ... Gear, 1 ... Work vehicle, 2 ... Main body part, 3 ... Working machine, 4
... steering wheel, 5 ... change lever, 6 ... traveling wheel, 7 ...
Engine, 8 ... Fuel tank, 9 ... Crankshaft, 10 ... Clutch case, 11 ... Mission case, 12 ... Tillage rotary pawl, 13 ... Cover, 14 ... Flat plate, 15 ... Rear cover, 16 ... Tail wheel, 17 ... Bolt, 18 ... Bracket, 19 ... Fixing mechanism, 20 ...
Handlebar, 21 ... U-shaped part, 22 ... Change guide,
23 ... Clutch device, 24 ... Sun gear, 25 ... Planetary gear, 26 ...
Clutch output shaft, 27 ... Drive plate, 28 ... Shaft, 29 ...
Ring gear, 30 ... Clutch outer, 31 ... Clutch inner, 32 ... Clutch shoe, 33 ... Pin, 34 ... Clutch spring, 35 ... Drive shaft, 36 ... Cam, 37 ... Friction piece, 38 ... Drive shaft, 39 ... Gear, 40 ... Arms, 41 ... Speed change transmission mechanism, 42 ... Main shaft, 43 ... Counter shafts, 44, 45 ... Axle,
46 ... Mission input shaft, 47 ... Driving bevel gear, 48 ... Driven bevel gear, 49 ... Sleeve, 50 ... Sprocket, 51 ... Rotary shaft, 52 ... Chain, 53, 54 ... Fork, 55 ... Differential device, 56
… Differential gear box, 57, 58… Sprocket, 59… Chain, 60
... Bearing, 61 ... Differential small gear shaft, 62 ... Differential small gear, 63 ... Differential large gear, 64 ... Differential stop device, 65 ... Shifter, 66 ... Spring, 67 ... Rotating shaft, 68 ... Arm, 69 ... Protrusion, 70 ... Lever member, 71 ... Wire, 72 ... Spring, 73 ... Outer tube, 74 ... Bracket, 75 ... Differential stop lever, 76 ... Lock lever, 77 ...
Throttle lever, 78 ... Clutch lever, 79 ... Hand.

Claims (3)

[Claims] 1. A main body for connecting a working machine, a prime mover for driving the working machine, a pair of left and right traveling wheels driven by the prime mover via a differential device, and the working machine and the working machine. A clutch device that connects and disconnects power transmission to the traveling wheels, a differential stop device that stops the differential function of the differential device, and a handle that extends rearward and upward from the main body portion are provided. In a work vehicle, the handle is formed in a loop shape having a handlebar extending in the left-right direction at a rear end portion thereof, and a differential stop lever connected to the differential stop device is vertically swingable below the handle. And along the handlebar at the upper swing position,
A work vehicle characterized in that the operation stop lever is urged downward and the differential stop device is inactivated at the upper swing position. 2. A clutch lever connected to the handle clutch device is provided on the upper side of the handle so as to be vertically swingable and along the handle bar at a lower swing position, and the clutch lever is directed upward. The work vehicle according to claim 1, wherein the clutch device is in an engaged state when being biased and in the downward swing position. 3. The work vehicle according to claim 2, wherein U-shaped portions projecting rearward are provided at both left and right ends of the handlebar of the handle.