JP2003072412A - Walking type working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a body from keeping travel by allowing the turn-off of a travel clutch mechanism even when a main clutch lever is locked to an on- position for any reason. SOLUTION: This walking type cultivator 1 comprises a travel power transmission passage for transmitting the power of an engine 3 to a wheel 5, a travel clutch mechanism 8 provided in the travel power transmission passage, and the main clutch lever 19 for turning on/off the travel clutch mechanism 8. The walking type cultivator 1 has auxiliary clutch levers 20, 21 capable of turning off the travel clutch mechanism 8 even when the main clutch lever 19 is at an on-position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of walk-type work vehicles such as walk-type cultivators.

[0002]

2. Description of the Related Art Generally, a walking type work vehicle such as a walking type cultivator has a traveling power transmission path for transmitting engine power to a traveling section, and a traveling clutch mechanism provided in the traveling power transmission path. A main clutch lever for turning on and off the traveling clutch mechanism is provided, and a starting operation and a traveling stopping operation of the walk-behind work vehicle are performed based on the on / off operation of the main clutch lever.

[0003]

However, in the above conventional walk-type work vehicle, since the traveling clutch mechanism and the main clutch lever are directly connected by the wire, the main clutch lever is locked in the on position for some reason. Then, the traveling clutch mechanism cannot be disengaged, and the aircraft may continue traveling.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and has a traveling power transmission path for transmitting engine power to a traveling portion. A walking type work vehicle comprising: a running clutch mechanism interposed in the running power transmission path; and a main clutch lever for turning the running clutch mechanism on and off. It is characterized in that an auxiliary clutch operation tool is provided which can disengage the traveling clutch mechanism even when the clutch lever is in the on position. That is, even if the main clutch lever is locked in the on position for some reason, the auxiliary clutch operation tool can be used to disengage the traveling clutch mechanism, and as a result, it is possible to avoid the inconvenience that the aircraft continues to travel. it can. Further, the main clutch lever and the auxiliary clutch operating tool are configured to be independently operable, and even when the auxiliary clutch operating tool is in the on position, the main clutch lever allows the disengaging operation of the traveling clutch mechanism. To do. In this case, even if the auxiliary clutch operating tool is locked in the on position for some reason, the traveling clutch mechanism can be disengaged by the main clutch lever, and as a result, the inconvenience of the aircraft continuing to travel can be avoided. can do. Also, of the pair of left and right handles provided on the walk-behind work vehicle,
A main clutch lever and a first auxiliary clutch operating tool are provided on either one of the handles, and a second auxiliary clutch operating tool connected to the first auxiliary clutch operating tool is provided between the left and right handles. Is characterized by. In this case, by providing the main clutch lever and the auxiliary clutch operating tool on the handle on the same side, it is easy to deal with the case where any operation is locked, and the second auxiliary between the left and right handles. Since the clutch operation tool is provided, it is possible to easily stop the traveling of the airframe in an emergency. Further, the walking type work vehicle is provided with a parking brake lever for turning on / off the parking brake mechanism, and when the parking brake lever is in the on position, a main clutch is provided between the parking brake lever and the main clutch lever. It is characterized in that a clutch engagement / disengagement means is provided for restraining the lever operation. In this case, it is possible to prevent the inconvenience of running the machine while the parking brake mechanism is in the on state.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one of the embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a walk-behind cultivator, and the walk-behind cultivator 1 shifts power of the engine 3 and an engine 3 mounted on the machine frame 2 facing the front-rear direction. The transmission case 4, the pair of left and right wheels 5 attached to the lower end of the transmission case 4 via an axle (not shown), the rotary tiller 6 mounted on the rear portion of the body frame 2, and the body frame 2 And a handle frame 7 extending from the rear portion.

Engine 3 and transmission case 4
A traveling clutch mechanism 8 is provided between the and. The traveling clutch mechanism 8 includes an output pulley 9 provided on the output shaft 3a of the engine 3, an input pulley 10 provided on the input shaft 4a of the transmission case 4, both pulleys 9,
Transmission belt 11 suspended between 10 and the transmission belt 1
A tension arm 12 for tensioning / relaxing 1 is provided, and a belt tension clutch mechanism for turning on / off the power transmission between the pulleys 9 and 10 according to the operation of the tension arm 12 is configured.

The handle frame 7 is provided with a clutch operating mechanism 13 for turning on / off the traveling clutch mechanism 8. The clutch operating mechanism 13 connects a bracket 14 integrally provided on the left handle frame 7 a, a plate 15 arranged inside the bracket 14 with a predetermined gap, and the plate 15 to the bracket 14. A plurality of stays 16, the stays 16 and the bracket 14
A lever support shaft 17 rotatably supported between the lever support shaft 17 and an operating arm 18 rotatably supported by the lever support shaft 17.
A main clutch lever 19 rotatably supported by the lever support shaft 17, and a first auxiliary clutch lever (finger clutch lever) rotatably supported by the lever support shaft 17.
20 and a second auxiliary clutch lever (emergency stop lever) whose left end is integrally connected to the first auxiliary clutch lever 20 and whose right end is rotatably supported by the right handle frame 7b via the support shaft 21a. ) 21 and.

At the tip of the operating arm 18, there is provided a connecting plate 22 which is in the shape of a side view in a rotatably manner. The coupling plate 22 includes the clutch wire 23 and the tension spring 2
The tension arm 12 is connected to the tension arm 12 of the traveling clutch mechanism 8 via 3a and the like, and the tension arm 12 is turned on / off according to the rotation of the operation arm 18. The connecting plate 22 urges the operating arm 18 to the disengagement side by the tensile load of the clutch wire 23. However, when the operating arm 18 is rotated to the entry position, the tie point of the wire tensile load is exceeded, and The actuating arm 18 is held in the entry position by the load. Further, a first connecting arm 24 is integrally provided at the base end portion of the operating arm 18, and the first connecting arm 24 engages with the stopper 25, whereby the turning range of the operating arm 18 on the cut side. Is limited.

A second connecting arm 27 having an arm connecting mechanism 26 is integrally provided at the base end of the main clutch lever 19. The arm connecting mechanism 26 includes a bracket 28 having a U-shape in a plan view, a connecting pin 29 that is slidably mounted on the bracket 28 in the left-right direction, and protrudes and retracts from a hole 27a of the second connecting arm 27, and the connecting pin 29 is projected in the protruding direction. And a spring 30 for biasing the The connecting pin 29 has a conical tapered surface 29a at the tip thereof, and in a normal state, by engaging with the engaging hole 24a of the first connecting arm 24, the operating arm 18 and the main clutch lever. 19 and 19 are integrally connected to each other to allow the main clutch lever 19 to turn on / off the traveling clutch mechanism 8. Also,
When the main clutch lever 19 is in the engaged position (front side position), the connecting pin 29 rides on the fixed pin 31 projectingly provided on the bracket 14 to be retracted to a predetermined position. When the main clutch lever 19 is operated to the disengaged side (rear side) in this state, the engagement pin 32 provided at the front end portion of the second connecting arm 27 engages with the first connecting arm 24, so that the operating arm 18 moves. Although it rotates in the disengaging direction integrally with the main clutch lever 19, as will be described later, the first connecting arm 2
When 4 is independently turned to the cut side, the connecting state of the first connecting arm 24 and the second connecting arm 27 is released by further retracting the connecting pin 29 by the guide action of the tapered surface 29a. As a result, the traveling clutch mechanism 8 can be disengaged by independently rotating the operating arm 18.

The second auxiliary clutch lever 21 is supported between the left and right handle frames 7a and 7b as described above. The right end portion of the second auxiliary clutch lever 21 is rotatably supported by a bracket 33 provided on the right handle frame 7b, and is biased and held at an upper position (entrance position) by a torsion spring 34. The bracket 33 is provided with a stopper 35, and the stopper 35 limits the turning range of the first and second auxiliary clutch levers 20 and 21 on the disengagement side. The first auxiliary clutch lever 20 extends rearward along the left handle frame 7a, and integrally includes an engagement pin 21a on the base end side thereof. The engagement pin 21a engages with the intermediate plate 36 provided between the bracket 15 and the plate 16 to limit the turning range of the first and second auxiliary clutch levers 20 and 21 on the entry side. Further, when the first or second auxiliary clutch lever 20, 21 is operated to the disengagement side, the engagement pin 21a is
The distal end portion of the operating arm 18 is engaged from above and the operating arm 18 is turned to the cut side. This enables the disengagement operation of the traveling clutch mechanism 8 by the first or second auxiliary clutch levers 20 and 21.

On the inner side surface of the bracket 15, a guide arm 37 having a tapered surface 37a on one side surface is rotatably provided. The guide arm 37 is biased rearward by a torsion spring 38 and elastically abuts the front end of the first connecting arm 24 at least when the first connecting arm 24 is in the cut position. That is, after the traveling clutch mechanism 8 is disengaged by the independent rotation of the operating arm 18, the main clutch lever 1
When 9 is returned to the cut position, the connecting pin 29 is guided by the tapered surface 37a of the guide arm 37 and rides on the first connecting arm 24, and then engages with the engaging hole 24a of the first connecting arm 24. As a result, the main clutch lever 1
9 is again connected to the operating arm 18, and the traveling clutch mechanism 8 can be operated by the main clutch lever 19.

Next, the operation of the clutch operating mechanism 13 will be described with reference to the drawings. FIG. 5 is a side view of the clutch operating mechanism showing a normal clutch disengaged state. As shown in this figure, in the normal clutch disengaged state, the main clutch lever 19
The operating arm 18 is held at the cut position and is integrally connected via the connecting pin 29 ((A) of FIG. 9). When the main clutch lever 19 is operated to be engaged in this state, the operating arm 18 integrally rotates to pull the clutch wire 23, and the traveling clutch mechanism 8 is engaged. At this time, the operating arm 18 and the main clutch lever 19
6 is held at the entry position by the wire tensile load that exceeds the fulcrum, and the connecting pin 29 rides on the fixed pin 31 ((B) of FIG. 9). When the main clutch lever 19 is operated to the disengagement side in this state, as shown in (C) of FIG.
By engaging 2 with the first connecting arm 24, the operating arm 18 rotates in the disengagement direction integrally with the main clutch lever 19, and the traveling clutch mechanism 8 is disengaged. At this time,
Even if the first and second auxiliary clutch levers 20 and 21 are locked in the on position, the disengagement operation of the main clutch lever 19 is allowed. On the other hand, in the clutch engaged state (FIG. 6), the first or second auxiliary clutch lever 20, 21
7 is operated to the disengagement side as shown in FIG. 7, the first connecting arm 24 comes off from the connecting pin 29 to allow the operating arm 18 to rotate independently as shown in (D) of FIG. 8 is turned off. As a result, even when the main clutch lever 19 is locked in the on position, the traveling clutch mechanism 8 can be disengaged. When the main clutch lever 19 is operated to the disengaged side as shown in FIG. 8 after the first or second auxiliary clutch levers 20 and 21 are disengaged, the connecting pin 29 is disassembled as shown in FIG. Rides on the first connecting arm 24 by the guide of the guide arm 37 and automatically engages with the engaging hole 24a. As a result, the main clutch lever 19 is connected to the actuating arm 18 again, and the clutch engaging operation by the main clutch lever 19 becomes possible.

By the way, the clutch operation mechanism 13 of the present embodiment is provided with a parking brake lever 39.
The parking brake lever 39 is supported by the lever support shaft 17 so as to be rotatable back and forth, and has an arm member 39 at its base end.
a is integrally provided. The arm member 39a is connected to a parking brake mechanism (not shown) via a brake wire 40, and pulls the brake wire 40 in response to a backward operation of the parking brake lever 39 to put the parking brake mechanism into an on-operation ( While the brake is turned on), the brake wire 40 is released in response to the forward operation of the parking brake lever 39.
The parking brake mechanism to release (brake OFF)
Let At this time, the parking brake lever 39 is held at each position by exceeding the fulcrum of the wire tensile load. Further, an engaging pin 41 that engages with the main clutch lever 19 from the front side is integrally provided at an intermediate portion of the parking brake lever 39. As shown in FIG. 10, when the parking brake lever 39 is in the disengaged position, free clutch on / off operation of the main clutch lever 19 is allowed, but as shown in FIG. 11, the parking brake lever 39 is disengaged. When in the position, the engagement operation of the main clutch lever 19 is restrained by the engagement pin 41. When the main clutch lever 19 is forcibly turned on in this state, the main clutch lever 19 pushes the parking brake lever 39 via the engagement pin 41,
Turn off the parking brake mechanism. This avoids the inconvenience of traveling the aircraft with the parking brake mechanism in the on state. Further, as shown in FIG. 12, the main clutch lever 19 is in the on position, and the parking brake lever 39
When is in the off position, the engagement pin 41 restrains the parking brake lever 39 from entering. When the parking brake lever 39 is forcibly turned on or off in this state, the parking brake lever 39 pushes the main clutch lever 19 via the engagement pin 41 to disengage the main clutch lever 19.
This avoids the inconvenience of turning on the parking brake mechanism when the vehicle is traveling. Further, in the state shown in FIG. 12, the engagement pin 41 functions as a stopper of the main clutch lever 19 and prevents the main clutch lever 19 from falling too much.

Further, the clutch operating mechanism 13 of the present embodiment.
A safety switch 42 is provided in the. The safety switch 42 is electrically connected to the ignition circuit so as to regulate the engine start when in the OFF state. The safety switch 42 of the present embodiment is composed of a micro switch including a switch main body, a switch button that is provided so as to be retractable in the switch main body, and a detection lever 42a that makes the switch button retractable, and the detection lever 42a. Is elastically abutted against the cam surface 43 formed on the boss portion of the main clutch lever 19. That is, as shown in FIG. 13A, when the main clutch lever 19 is in the disengaged position, the detection lever 42a is pushed by the large diameter portion of the cam surface 43 to turn on the safety switch 42.
And allow the engine to start. On the other hand, FIG. 13 (B)
As shown in, when the main clutch lever 19 is in the on position, the detection lever 42a comes into contact with the small diameter portion of the cam surface 43 to turn off the safety switch 42 and regulate the engine start. This avoids the inconvenience that the vehicle body starts at the same time when the engine is started.

In the structure configured as described above, a traveling power transmission path for transmitting the power of the engine 3 to the wheels 5,
A traveling clutch mechanism 8 provided in the traveling power transmission path.
And a main clutch lever 19 for turning the traveling clutch mechanism 8 on and off, wherein the main clutch lever 19 is in the on position in the walking type cultivator 1. Since the auxiliary clutch levers 20 and 21 that can be operated to disengage the traveling clutch mechanism 8 are provided, the main clutch lever 1
Even if 9 is locked in the on position for some reason, the traveling clutch mechanism 8 can be turned off by the auxiliary clutch levers 20 and 21, and as a result, it is possible to avoid the inconvenience that the aircraft continues to travel. .

Further, the main clutch lever 19 and the auxiliary clutch levers 20 and 21 are constructed so that they can be operated independently, and the traveling clutch mechanism 8 is operated by the main clutch lever 19 even when the auxiliary clutch levers 20 and 21 are in the on position. The auxiliary clutch levers 20, 21
Even if the vehicle is locked in the on position for some reason, the traveling clutch mechanism 8 can be disengaged by the main clutch lever 19, and as a result, it is possible to avoid the inconvenience that the aircraft continues traveling.

In addition, the main clutch lever 19 and the first auxiliary clutch lever 20 are provided on either one of the pair of left and right handle frames 7a, 7b provided on the walk-type cultivator 1 and the left and right handle frames 7a, 7b are provided. Since the second auxiliary clutch lever 21 linked to the first auxiliary clutch lever 20 is provided between the handle frames 7a, 7b of the above, the main clutch lever 19 and the first auxiliary clutch lever 20 are provided on the handle frame 7a on the same side. As a result, it is easy to handle the case where any operation is locked, and the left and right handle frames 7a,
By providing the second auxiliary clutch lever 21 between 7b, it is possible to easily stop the traveling of the airframe in an emergency.

Further, the walk-type cultivator 1 is provided with a parking brake lever 39 for turning on / off the parking brake mechanism, and when the parking brake lever 39 is in the on position, the main clutch lever Since the engaging pin 41 for restraining the entering operation of 19 is provided, it is possible to prevent the inconvenience of running the machine body while the parking brake mechanism is in the engaged state.

The present invention is not limited to the above-mentioned embodiment, and the auxiliary clutch lever 20 may be provided as in the second embodiment shown in FIGS. 14 and 15, for example.
It may be provided integrally with the operating arm 18. In this case, the traveling clutch mechanism 8 using the auxiliary clutch lever 20
There is an advantage that the input operation can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a walk-behind cultivator.

FIG. 2 is a side view of a traveling clutch mechanism.

FIG. 3 is a plan view of a clutch operating mechanism.

FIG. 4 is a view on arrow A in FIG.

FIG. 5 is a side view of the clutch operating mechanism showing a normal clutch disengaged state.

FIG. 6 is a side view of the clutch operating mechanism showing a state where a main clutch lever is operated to be turned on.

FIG. 7 is a side view of the clutch operating mechanism showing a state in which the auxiliary clutch lever is operated to be disengaged while the clutch is engaged.

FIG. 8 is a side view of the clutch operating mechanism showing a state in which the main clutch lever is operated to the disengaged side after the auxiliary clutch lever is disengaged.

9A is a plan view of an arm connecting mechanism corresponding to FIG. 5, and FIG. 9B is a plan view of an arm connecting mechanism corresponding to FIG.
6 (C) is a plan view of the arm coupling mechanism showing the process of returning from FIG. 6 to FIG. 5, (D) is a plan view of the arm coupling mechanism corresponding to FIG. 7, and (E) is a plan view of the arm coupling mechanism corresponding to FIG. It is a top view.

FIG. 10 is a side view of the clutch operating mechanism showing a state where the parking brake lever and the main clutch lever are in the disengaged position.

FIG. 11 is a side view of the clutch operating mechanism showing a state where the parking brake lever is in the on position and the main clutch lever is in the off position.

FIG. 12 is a side view of the clutch operating mechanism showing a state where the parking brake lever is in the disengaged position and the main clutch lever is in the engaged position.

13A is a side view showing a safety switch ON state, and FIG. 13B is a side view showing a safety switch OFF state.

FIG. 14 is a side view of the clutch operating mechanism showing a clutch disengaged state in the second embodiment.

FIG. 15 is a side view of the clutch operating mechanism showing a clutch engaged state in the second embodiment.

[Explanation of symbols]

1 walk-type cultivator 4 transmission case 7 handle frame 8 Travel clutch mechanism 13 Clutch operation mechanism 17 Lever support 18 Working arm 19 Main clutch lever 20 First auxiliary clutch lever 21 Second auxiliary clutch lever 23 Clutch wire 24 First connecting arm 26 Arm connection mechanism 27 Second connecting arm 29 connecting pin 31 fixing pin 37 Guide Arm 39 Parking brake lever

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshio Maeda             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. F term (reference) 3D036 AA06 EB03 EB15 EB16 EB36                       EC17 EC23

Claims (4)

[Claims] 1. A travel power transmission path for transmitting engine power to a travel section, a travel clutch mechanism provided in the travel power transmission path, and a main clutch lever for turning on / off the travel clutch mechanism. A walk-behind work vehicle comprising: a walk-behind work vehicle provided with an auxiliary clutch operating tool capable of disengaging a traveling clutch mechanism even when the main clutch lever is in an on position. Work vehicle. 2. The main clutch lever and the auxiliary clutch operating device according to claim 1, wherein the main clutch lever and the auxiliary clutch operating device can be operated independently, and the traveling clutch mechanism is disengaged by the main clutch lever even when the auxiliary clutch operating device is in the ON position. A walk-behind work vehicle characterized by allowing operation. 3. The main clutch lever and the first auxiliary clutch operating tool are provided on either one of a pair of left and right handles provided on the walk-behind work vehicle according to claim 1 or 2. Between the handles of
A walk-behind work vehicle comprising a second auxiliary clutch operating tool connected to the first auxiliary clutch operating tool. 4. The walk-behind work vehicle according to claim 1, further comprising a parking brake lever for turning on and off a parking brake mechanism, and parking between the parking brake lever and the main clutch lever. A walk-behind work vehicle characterized in that a clutch engagement / disengagement means for interposing an engagement operation of a main clutch lever when the brake lever is in an engagement position is provided.