JP2002012171A - Forward-reverse switching operation mechanism of walking type work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce lever operation of a main clutch lever and a work machine clutch lever in a walking type work machine having a forward-reverse switching operation mechanism. SOLUTION: In this walking type work vehicle for arranging a forward- reverse switching operation tool 65 on a handle 22 projecting from a main machine, the forward-reverse switching operation tool and the main clutch lever 25 are interlocked and connected, and when switching the forward-reverse switching operation tool from a travel state, the main clutch lever is disconnected, and the forward-reverse switching operation tool and the work machine clutch lever 24 are interlocked and connected, and when switching the forward- reverse switching operation tool from the travel state, the work machine clutch lever is disconnected, and the forward-reverse switching operation tool and the main clutch lever or the forward-reverse switching operation tool and the work machine clutch lever are respectively interlocked and connected via wires 46 and 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walk-behind work vehicle, and more particularly to a technique for improving work efficiency by providing a forward / reverse switching operation tool on a handle of a management machine.

[0002]

2. Description of the Related Art Conventionally, a handle is projected backward from a machine of a walk-behind work vehicle, and an operation lever for forward / reverse switching is provided near a grip of the handle, and the forward / reverse switching lever is operated without operating a main clutch. A technique that allows the user to switch between forward and backward movements simply by operating is known.

[0003] For example, the technology of Mitsuto 2543125 is
An operation lever that can be operated to switch between a forward position and a reverse position is disposed near a grip portion disposed behind a handle of a binder as a walking-type work vehicle, and the operation lever is configured to be lockable at a position where the operation lever is lowered. A thumb operation means for releasing the lock was provided.

The technology disclosed in Japanese Utility Model Laid-Open No. 6-42369 is
A forward / backward switching lever is provided at the rear grip portion of the handle of the management machine as a walk-behind work vehicle, and the forward / backward switching lever is connected to a shifter provided on the transmission case via a wire or the like, and the shifter and forward gear A dog clutch is provided between the shifter and the reverse gear, and a tapered claw clutch is disposed between the shifter and the reverse gear. Then, the reverse running was automatically interrupted.

[0005]

However, in the prior art, when the vehicle is switched between forward and backward, the vehicle immediately travels in the opposite direction. Therefore, the operator cannot respond to the sudden movement in the opposite direction. There is a risk of falling. In addition, when switching from the forward operation to the reverse operation, if the operator is located behind the work machine, and the work machine is driven together with the reverse traveling, it is very dangerous,
Normally, it is configured so that it cannot be switched to the reverse side, but by turning the handle forward, the operator is located in front of the fuselage and works while moving forward, and when switching to reverse at the field end, the work machine is driven Otherwise, the ridges formed by the working machine, for example, are broken. Therefore, the present invention is designed to disengage the main clutch and the PTO clutch when the forward / reverse switching lever is operated to run in the opposite direction.

[0006]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in a walk-behind work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, the forward / reverse switching operation tool and the main clutch are interlocked and the main clutch is switched when the forward / reverse switching operation tool is switched from the running state. Is “off”.

Further, in a walking type work vehicle provided with a forward / reverse switching operating tool on a handle protruding from the machine, the forward / backward switching operating tool and the working machine clutch are interlocked and the forward / backward switching operating tool is switched from a running state. When operated, the work machine clutch is turned off.

Further, in a walking type work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, the forward / backward switching operation tool, the main clutch and the work machine clutch are interlocked and the forward / backward switching operation tool is driven. When the switching operation is performed from the state, the main clutch and the work machine clutch are simultaneously turned off.

Further, the forward / reverse switching operation tool and the main clutch, or the forward / reverse switching operation tool and the work machine clutch are interlocked and connected via wires.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in which a walk-behind work vehicle is used as an example of a management machine. 1 is a side view of a control device equipped with a forward / reverse switching operation mechanism of the present invention, FIG. 2 is a cross-sectional view of an upper rear surface of a transmission case, FIG. 3 is a cross-sectional view of a lower rear surface of a transmission case, and FIG. FIG. 5 is a plan view, FIG. 5 is a sectional view of an upper rear surface of a transmission case showing another embodiment of a forward / reverse switching mechanism, FIG. 6 is a side view of a mounting portion of a reverser lever, and FIG. 7 is a side view of a mounting portion of a main clutch lever. is there.

Referring to FIG. 1, the overall structure of the management machine 1 will be described. The management machine 1 has an engine 2 at the front, a rotary tilling device 4 as a working machine at the rear, and a transmission case 3 at the center. The engine table 5 is mounted and fixed on the engine table 5, and the rear of the engine table 5 is fixed to the transmission case 3. Pulleys are fixed to the output shaft 6 of the engine 2 and the input shaft 7 of the transmission case 3, respectively, so that power can be transmitted via a belt. A belt tension type main clutch 10 is disposed between the output shaft 6 and the input shaft 7, and can be operated by a main clutch lever 25 provided on a handle 22. The tension clutch, belt, pulley and the like are covered by a transmission case 9.

An axle 11 is pivotally supported at the lower portion of the transmission case 3, and wheels 12 are fixed to the axle 11 so that the vehicle can be driven to travel. A hitch 13 is provided at the rear of the transmission case 3, and the front of the rotary tilling device 4 is mounted on the hitch 13. In the rotary tilling apparatus 4, a chain case 14 is disposed at the center in the left and right direction, and a PTO input shaft is laid on the upper end of the chain case 14 to be described later.
Power is transmitted from the O shaft 15 via a chain or a belt to drive the rotary tillage device 4.
PT on the PTO input shaft at the top of the chain case 14
An O clutch 19 is disposed, and the PTO clutch 19 is connected to a PTO clutch lever 24 which is a working machine clutch lever described later. However, the PTO clutch 19
Is not limited to the PTO input shaft.
The belt tension clutch may be provided on the O-shaft 15 and the power may be transmitted between the PTO shaft 15 and the PTO input shaft by a belt. A cultivating claw shaft 16 is pivotally supported at the lower part of the chain case 14, and a plurality of cultivating claws 17 are mounted on the cultivating claw shaft 16.
Are planted. The upper part and the side of the rotation locus of the tip of the tilling claws 17 are covered with a tilling cover 18.

On the upper part of the transmission case 3, a handlebar 21 is provided.
2 is arranged to be able to swing back and forth in the horizontal direction and to be able to swing back and forth. FIG. 1 shows a state in which the handle 22 is moved forward. The handle 22 includes a main clutch lever 25 and a side clutch lever 26, which will be described later.
26 and an accelerator lever 27 are arranged,
A side clutch left / right switching mechanism is arranged in the middle of the front and rear. A main shift lever 31 is projected from the left rear portion of the handle base 21 so as to be able to swing back and forth.

Next, as shown in FIG. 2 and FIG.
Will be described. In the transmission case 3, the input shaft 7, the PTO shaft 15, the main transmission shaft 33, the sub transmission shaft 34, the reduction shaft 35, the axles 11L and 11R, and the fork shafts 36 and 37 are horizontally laid horizontally and horizontally. The axes of the input shaft 7, the main transmission shaft 33, and the auxiliary transmission shaft 34 are arranged in a triangular shape in a side view. One end of the input shaft 7 projects to the left outside from the transmission case 3, and an input pulley 40 is fixed outside the transmission case 3. The input shaft 7
A boss 7a is formed at the other end of the
One end of the TO shaft 15 is rotatably fitted on the same axis. A forward / reverse switching mechanism 41 is arranged between the other end of the input shaft 7 and one end of the PTO shaft 15. In other words,
The shaft is divided into right and left, and a forward / reverse switching mechanism 41 is disposed in the divided portion.

The forward / reverse switching mechanism 41 includes a reverse gear 42 fixed on the input shaft 7, a forward pawl 44 fixed on the PTO shaft 15, and the boss between the reverse gear 42 and the forward pawl 44. A slider 43 slidably disposed on the portion 7a,
Power can be transmitted in the reverse or forward direction by engaging the pawls provided on both sides of the slider 43 with the pawls of the reverse gear 42 or the forward pawls 44. The switching of the slider 43 is performed by operating a reversing lever 65 described later. However, the forward / reverse switching mechanism 41 may be constituted by a multi-plate clutch or a gear meshing type.
By arranging the input shaft 7 and the PTO shaft 15 on the same axis in this way, the number of shafts can be reduced and the transmission case can be made compact.

A sliding gear 51 is fitted on the main transmission shaft 33 so as to be slidable in the axial direction, and a counter gear 52 having two teeth is rotatably loosely fitted. A transmission gear 59 is fixedly provided at the portion. In addition, the PTO
A slider 53 is fitted on the shaft 15 so as to be slidable so as to be relatively non-rotatable, and a transmission gear 54 is rotatably fitted loosely via a bearing. The transmission gear 54 has one internal tooth 54a.
And two external teeth 54b and 54c. The internal teeth 54a are arranged so as to be able to mesh with the slider 53, the external teeth 54b are arranged so as to be able to mesh with the sliding gear 51, and the external teeth 54c are gears 56 fixed on the sub-transmission shaft 34 to be described later.
Is always engaged. Further, a gear 55 is integrally provided on the PTO shaft 15, and the gear 55 is
The transmission gear 59 fixed on the gear 3 is always meshed.

A gear 56 and a gear 57 are fixedly mounted on the auxiliary transmission shaft 34, and the gear 56 is provided with external teeth 5 of the transmission gear 54.
4c is always meshed with the gear 57.
Is always engaged with the other. Further, on the auxiliary transmission shaft 34 between the gear 56 and the gear 57, there are provided reduction small-diameter gears 60 and 61.
Are freely rotatably fitted, and a ball clutch 62 is disposed between the small reduction gears 60 and 61.
2 is capable of performing high and low speed shifting by sliding of a slider 63, and the slider 63 is connected to an auxiliary speed change lever 69 via a shifter or the like so as to perform an auxiliary speed change operation.

In such a configuration, the slider 43 is engaged with the forward pawl 44 in the case of the first forward gear to the sixth forward gear, and the sliding gear 51 of the main transmission is provided in the case of the first forward gear and the second forward gear. The transmission gear 54 is meshed with the external teeth 54b. In the case of the first forward speed, the slider 63 of the subtransmission is slid leftward so that the low-speed gear 60 and the subtransmission shaft 34 rotate integrally. Thus, the input shaft 7 → the slider 43
→ advance claw body 44 → PTO shaft 15 → gear 55 → gear 59 →
Sliding gear 51 → transmission gear 54 → gear 56 → sub-transmission shaft 34
→ Ball clutch 62 → Low speed gear 60 → Low speed driven gear 8
1 → Power is transmitted to the reduction shaft 35. In the case of two forward speeds, the slider 63 of the auxiliary transmission is slid rightward to
And the auxiliary transmission shaft 34 are integrally rotated. Thus, similarly to the above, the gear 56 → the auxiliary transmission shaft 34 → the ball clutch 62 → the high speed gear 61 → the high speed driven gear 82 → the reduction shaft 35
To tell the power.

In the case of three forward steps and four forward steps, the slider 4
3 is engaged with the forward pawl body 44, and the internal teeth of the sliding gear 51 of the main transmission are meshed with the counter gear 52. In the case of three forward speeds, the slider 63 of the subtransmission is slid to the left so that the low-speed gear 60 and the subtransmission shaft 34 rotate integrally. Thus, the input shaft 7 → the slider 43
→ advance claw body 44 → PTO shaft 15 → gear 55 → gear 59 →
Power is transmitted to the sliding gear 51 → the counter gear 52 → the gear 57 → the sub transmission shaft 34 → the ball clutch 62 → the low speed gear 60 → the low speed driven gear 81 → the reduction shaft 35. In the case of four forward speeds, the slider 63 of the subtransmission is slid rightward so that the high-speed gear 61 and the subtransmission shaft 34 rotate integrally. Thus, similarly to the above, the gear 57 → the auxiliary transmission shaft 34 → the ball clutch 62 → the high speed gear 61 → the high speed driven gear 82 →
Power is transmitted to the reduction shaft 35.

In the case of five forward steps and six forward steps, the slider 4
3 is engaged with the forward pawl body 44, and the slider 53 of the main transmission meshes with the internal teeth 54 a of the transmission gear 54. And
In the case of five forward speeds, the slider 63 of the auxiliary transmission is slid to the left so that the low-speed gear 60 and the auxiliary transmission shaft 34 rotate integrally. Thus, the input shaft 7 → the slider 43 → the forward pawl body 44 → the PTO shaft 15 → the slider 53 → the transmission gear 5
4 → gear 56 → auxiliary transmission shaft 34 → ball clutch 62 → low speed gear 60 → low speed driven gear 81 → power is transmitted to reduction shaft 35. In the case of six forward speeds, the slider 63 of the subtransmission is slid rightward so that the high-speed gear 61 and the subtransmission shaft 34 rotate integrally. Thus, the gear 56 →
Power is transmitted to the auxiliary transmission shaft 34 → the ball clutch 62 → the high speed gear 61 → the high speed driven gear 82 → the reduction shaft 35.

In the case of one reverse stage and two reverse stages, the slider 4
3 is engaged with the reverse gear 42 so that the sliding gear 51 and the slider 53 of the main transmission are positioned neutral without meshing, and in the case of one reverse speed, the slider 6 of the auxiliary transmission is
3 is slid to the left so that the low-speed gear 60 and the sub-transmission shaft 34 rotate integrally. Thus, power is transmitted to the input shaft 7 → the slider 43 → the reverse gear 42 → the gear 52 → the gear 57 → the subtransmission shaft 34 → the ball clutch 62 → the low speed gear 60 → the low speed driven gear 81 → the reduction shaft 35. In the case of two reverse speeds, the slider 63 of the subtransmission is slid rightward so that the high-speed gear 61 and the subtransmission shaft 34 rotate integrally. Thus, similarly to the above, the gear 57 → the auxiliary transmission shaft 34 → the ball clutch 62 → the high speed gear 61 → the high speed driven gear 82 →
Power is transmitted to the reduction shaft 35.

The forward / reverse switching mechanism 41 can be constituted by a ball clutch as shown in FIG. 5, and the input shaft 7 is formed integrally with the PTO shaft 15 to form one shaft. May be arranged horizontally on the transmission case 3 so that the power on the traveling side is transmitted via a pipe shaft 39 fitted externally to the input shaft 7. That is, a forward / reverse switching mechanism 41 ′ composed of a ball clutch is arranged on the middle of the input shaft 7 ′, and the reverse gear 42 ′ and the forward rotating body 4 are arranged on the input shaft 7 ′.
4 'is freely rotatably fitted, the reverse gear 42' is always meshed with the counter gear 52, and the forward rotating body 44 'is fixed to one end of the pipe shaft 39. Then, a slider 45 is arranged between the reverse gear 42 'and the forward rotating body 44', and by sliding the slider 45, the input shaft 7 'and the reverse gear 42' or the forward rotating body 44 'and the ball are interposed. The power can be transmitted by engaging. The slider 45 is connected to the reverser lever 65 via a shifter, a wire, or the like.

A slider 53 is mounted on the pipe shaft 39.
Are rotatably fitted on the pipe shaft 39 so as to be rotatable relative to each other so that the transmission gear 54 is rotatably and loosely fitted on the pipe shaft 39. Other configurations are the same as those described above. With this configuration, the PTO shaft 15 is prevented from rotating at high speed via the transmission gear 59 and the gear 55 when switching to the reverse drive side.

The power transmitted to the reduction shaft 35 in this manner is further transmitted from a sprocket 83 fixed on the left and right halfway of the reduction shaft 35 via a chain 85 to the axles 11L and 11R, as shown in FIG. The power is transmitted to the sprocket 84 disposed on the side clutch to drive the axle 11. A brake device 28 is provided at one end of the auxiliary transmission shaft 34.

The PTO shaft 15 protruding outward from the transmission case 3 is covered by a cover 29. At the time of work, a sprocket is fixed on the PTO shaft 15 so as to be mounted on the upper part of the chain case 14 of the rotary tilling device 4. The chain is wound around the sprocket on the input shaft, and the power is transmitted to the rotary tilling device 4 so that the cultivating claw shaft 16 is rotated.
Can be driven.

Next, the operation system of the forward / reverse switching mechanism 41 of the present invention will be described. The forward / reverse switching mechanism 41 is housed in the transmission case 3 and has a grip 2 at the rear end of the handle 22.
By operating a reversing lever 65 as a forward / reverse switching operation tool disposed in the vicinity of 2a, it is possible to switch between forward, neutral and reverse, and a lever guide serving as an operation guide for the reversing lever 65 as shown in FIG. Reference numeral 66 denotes a crank-like structure, in which a forward position is provided at the front end of the handle, a neutral position is provided at the center, and a reverse position is provided at the rear end. In this way, when switching from forward to reverse or from reverse to forward, it always hits the lever guide 66 at the neutral position, and can be switched back and forth by swinging once and then turning further. Therefore, there is no sudden change from forward to reverse or from reverse to forward, and there is one cushion in the switching timing, so that sudden traveling in the opposite direction is prevented.

As shown in FIG. 4, the accelerator lever 27 is provided near the grip 22a of the left handlebar (with respect to the traveling direction F), and the main clutch lever 25 and the finger clutch lever 67 are provided near the right grip 22a. Are arranged and linked to each other, and the left and right grips 22a
A safety wire 70 is stretched between the wires 22a so that the main clutch can be disengaged by pulling or pushing a predetermined width or more. A vertically adjusting lever 68 of the handle 22, the PTO clutch lever 24, and an auxiliary speed change lever 69 are disposed on the front and rear halfway of the handle 22.

The forward / reverse switching mechanism 41 is connected to the reverser lever 65 via the wire 71, the arm, the shifter 80, or the like, and the slider 43 or the slider 45, and can switch between forward and backward by rotating the reverser lever 65. . The reversing lever 65 is connected to the main clutch lever 25 via a wire 46 or arm or the like serving as connecting means, and the reversing lever 65 is further connected to the PTO clutch lever 24 via a wire 47 or an arm serving as connecting means. ing. Thus, when the reversing lever 65 is switched from the forward position or the reverse position to the other side, the main clutch and the PTO clutch are turned to the "disengaged" side via the connecting means. However, the connecting means is not limited to a wire, but can be connected via a rod, a link, an arm, or the like. In addition, by rotating the reversing lever 65, only the main clutch or only the PTO clutch can be used. A configuration in which the operation is performed to the “off” side can also be adopted.

An example of a specific configuration will be described. As shown in FIG. 6, a base arm 90 is fixed to a turning base of the reversing lever 65, and the base arm 90 and the reversing lever 65 are rotatably supported around a fulcrum shaft 91. Are supported by a support plate (not shown) projecting from the handle 22. A support pin 92 protrudes from the base arm 90, and the wire 46
47 are connected. The other end of the wire 46 is connected to the main clutch lever 25, and the other end of the wire 47 is
It is connected to the O clutch lever 24. Further, a C-shaped arm 93 is pivotally connected to a support pin 93a of the base arm 90, and a wire 71 is connected to the other end of the arm 93.
The other end of the wire 71 is connected to the forward / reverse switching mechanism 41.

The position of the support pin 92 is such that the support pin 92 and the outer receptacles 94 of the wires 46 and 47 are respectively provided on the front and rear sides of the fulcrum shaft 91 when the reversing lever 65 is rotated to the neutral position (N). It is arranged so that it may be located on a straight line in side view. With this configuration, when the reverser lever 65 is rotated in the neutral direction from the forward position or the reverse position, the wires 46.4
7 is pulled, so that the main clutch lever 25 and the PTO clutch lever 24 connected to the wires 46 and 47 are turned to the "off" side.

Since the main clutch lever 25 and the PTO clutch lever 24 have substantially the same configuration, only the main clutch lever 25 will be described. As shown in FIG. 7, a base plate 25 a is fixed to the base side of the main clutch lever 25, and the base plate 25 a is pivotally supported by a support pin 96 protruded from a support plate 95 fixed to the handle 22. The base plate 25a is pivotally supported by an arm 98 via a connecting pin 97.
A wire 49 is connected to the other end of 8, and the other end of the wire 49 is connected to the main clutch 10.

A roller 99 is rotatably mounted on the base plate 25a.
Has a substantially L-shaped arm 100 pivotally supported by a shaft 100a, and the arm 100 is connected to the brake device 28 via a wire 50.
It is linked to Thus, the main clutch lever 25
When the is further rotated from the “off” position to the grip side, the roller 99 rotates by contacting the inner side of the arm 100, pulling the wire 50 to brake the brake device 28, thereby acting as a parking brake. .

Further, a contact pin 101 protrudes from the base plate 25a, and one end of a contact arm 102 is pivotally supported by a support plate 95, so that the contact arm 1
02, a contact portion 102a is provided in the middle of the contact pin 1
The other end of the wire 46 is connected to the other end of the contact arm 102. With this configuration, as described above, the reverser lever 65
When is rotated from the forward position or the reverse position in the neutral direction,
When the wire 46 is pulled, the contact portion 102a of the contact arm 102 pushes the contact pin 101, and the main clutch lever 25 is turned to the "off" side.

When the main clutch lever 25 or the PTO clutch lever 24 is in the "off" position, the main clutch lever 25
Alternatively, the PTO clutch lever 24 is not operated. Further, the wire 49 is pulled by a spring (not shown) so that the main clutch lever 25 can be maintained at the “on” position and the “off” position, and the connecting pin 97 is positioned beyond the dead center with respect to the support pin 96. The position is maintained at the "on" position and the "off" position. Accordingly, if the contact arm 101 pushes the contact pin 101 to a position where the connecting pin 97 exceeds the dead center, the contact pin 101 rotates to the “cut” side by the spring force. However, a configuration in which the reverser lever 65 and the main clutch lever 25 are interlocked and connected,
Also, the reverser lever 65 and the PTO clutch lever 24
May be configured to be interlocked and connected. In this embodiment, the connection is made by using a wire, but the connection may be made by using a link or an actuator. Further, in the present embodiment, the reversing lever 65 and the main clutch lever 25 are connected. However, the reversing lever 65 and the main clutch 10 may be directly connected. Similarly, a configuration in which the reverser lever 65 and the PTO clutch are directly connected may be employed.

With the above configuration, the operation is performed while moving forward or backward, and the reverser lever 65 is moved to the end of the field.
Is turned to the neutral side, the main clutch 10 is turned "off", and the traveling and the driving of the work machine are also stopped. At the same time, the PTO clutch is also "disengaged". When the reversing lever 65 is further rotated to the traveling position on the side opposite to the traveling direction, the forward / reverse switching mechanism 41 switches to the reverse traveling side. Then, when the main clutch lever 25 is turned to the "on" side, the machine can be driven to run and run around.
Next, when the reversing lever 65 can be set to a predetermined position by rotating, the reversing lever 65 is again rotated in the reverse direction to be switched to the work progress direction side. Even when the reversing lever 65 is operated, the main clutch lever 25 and the PTO clutch lever 24 Is turned to the “off” side. When the PTO clutch lever 24 is turned to the “in” side and the main clutch lever 25 is turned to the “in” side, the machine can run in the opposite direction to perform work. Is reduced,
Work efficiency can be improved.

[0036]

As described above, the present invention has the following advantages. That is, in a walk-behind work vehicle in which a forward / reverse switching operation tool is provided on a handle protruding from the machine, the forward / backward switching operation tool and the main clutch are interlocked and the forward / backward switching operation tool is in a running state. Since the main clutch is set to "disengage" when switching from, when traveling in the reverse direction from forward traveling or reverse traveling, first,
The main clutch lever is set to "off", the shift lever is switched to the gear position in the reverse traveling direction, and the main clutch lever is operated to "on". In the present invention, however, it is only necessary to switch the forward / reverse switching operation tool to the reverse traveling side. When the main clutch is disengaged, the traveling and the work are stopped, and the vehicle can travel in the opposite direction only by turning the main clutch on again, thereby reducing the number of operations and improving the working efficiency. Also, sudden or reverse running can be prevented.

According to a second aspect of the present invention, in a walking type work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, the forward / backward switching operation tool and a working machine clutch are interlocked to perform forward / reverse switching operation. When the tool is switched from the running state, the work machine clutch is turned off, so when switching from the work running state to running in the opposite direction, the work machine stops and, for example, in the case of a rotary plow, Rotation of the rotary while traveling in the direction does not break. And, when traveling in the opposite direction, the operation of turning off the work machine clutch can be omitted, and the number of operations can be reduced,
Work efficiency can be improved.

According to a third aspect of the present invention, there is provided a walking type work vehicle in which a forward / backward switching operation tool is provided on a handle protruding from the machine, the forward / backward switching operation tool, the main clutch, and the work implement clutch are interlocked and connected. Since the main clutch and the work equipment clutch are simultaneously turned off when the forward switching operation device is switched from the running state, the main clutch is turned off when the running state is switched from one direction to the other side.
As a result, the traveling and the working machine are stopped at the same time, so that the traveling machine does not suddenly travel in the reverse direction, and the traveling machine does not drive when the vehicle travels in the reverse direction, so that the field is not damaged. In addition, the number of times of operating the main clutch lever and the working machine clutch lever can be reduced, thereby improving workability.

Further, the forward / reverse switching operation tool and the main clutch, or the forward / reverse switching operation tool and the work machine clutch are interlocked and connected via wires, so that they can be connected with a simple structure. The space for connection may be small, and since the wire has flexibility, the restrictions on the space and place for connection are small,
It can be easily retrofitted.

[Brief description of the drawings]

FIG. 1 is a side view of a management machine equipped with a forward / reverse switching operation mechanism of the present invention.

FIG. 2 is an upper rear cross-sectional view of a transmission case.

FIG. 3 is a sectional view of a lower rear surface of a transmission case.

FIG. 4 is a plan view of an operation unit of the handle.

FIG. 5 is an upper rear cross-sectional view of a transmission case showing another embodiment of a forward / reverse switching mechanism.

FIG. 6 is a side view of a mounting portion of the reverser lever.

FIG. 7 is a side view of a mounting portion of the main clutch lever.

[Explanation of symbols]

 1 Management Machine 22 Handle 24 Work Machine (PTO) Clutch Lever 25 Main Clutch Lever 46/47 Wire 65 Reverser Lever (Forward / Reverse Switching Operation Tool)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B60K 23/02 B60K 23/02 K S F16H 61/36 F16H 61/36 F term (Reference) 2B043 AA03 AB11 BA01 BB03 DA05 DA15 3D036 AA04 EA01 EB03 EB08 EB15 EB16 EB36 EC18 EC25 GH16 GJ15 3D040 AA01 AA22 AA37 AB05 AC17 AC24 AC29 AC30 AC42 AC56 AC65 AD14 AD16 AD18 AE19 AF07 AF14 3J067 AA03 AB06 BA19 BB02 BB05 GA12 DA52

Claims (4)

[Claims] In a walking type work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, a forward / backward switching operation tool and a main clutch are interlocked and the forward / reverse switching operation tool is switched from a running state. Then, a forward / reverse switching operation mechanism of the walk-behind work vehicle characterized in that the main clutch is turned off. 2. A walk-behind work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, interlockingly connecting the forward / backward switching operation tool and the work machine clutch, and switching the forward / backward switching operation tool from a running state. A forward / reverse switching operation mechanism for a walk-behind work vehicle, wherein the work machine clutch is turned off when operated. 3. A walking type work vehicle provided with a forward / reverse switching operation tool on a handle protruding from the machine, interlockingly connecting the forward / backward switching operation tool, the main clutch and the work machine clutch, and traveling the forward / backward switching operation tool. A forward / backward switching operation mechanism for a walk-behind work vehicle, wherein when a switching operation is performed from a state, the main clutch and the work machine clutch are simultaneously turned off. 4. The forward / reverse switching operating tool and the main clutch, or the forward / reverse switching operating tool and the work implement clutch are interlocked and connected via wires, respectively. A forward / backward switching operation mechanism for a walking-type work vehicle according to claim 3.