JPH0561153B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a travel clutch that separately connects and disconnects the drive of the left and right travel devices, and a main clutch that simultaneously connects and disconnects the drive of both said travel devices. , a walking mode in which the operation system of the steering clutch is connected to the operation system of the main clutch so as to automatically reduce the transmission torque of the main clutch in conjunction with the disengagement operation of the steering clutch. This invention relates to a clutch operating device for a mold work vehicle.

[Conventional technology]

In the above-mentioned clutch operation device for a walking work vehicle, a dog clutch is generally used as the steering clutch, and the steering clutch is installed in the axle or in the transmission mechanism near the axle, so that the steering clutch can be easily operated. A large amount of force is required to disengage the opposite clutch, and the clutch operation is heavy.

Therefore, in order to correct the turning or meandering of the aircraft, when the steering clutch is disengaged, the main clutch is also disengaged at the same time. Conventionally, as shown in Japanese Patent Publication No. 39-28024, the main clutch was completely disengaged in conjunction with the disengagement operation of the steering clutch.

[Problem to be solved by the invention]

However, in this type of walking work vehicle,
In order to prevent the steering wheel from being pushed against the ground by the drive reaction force of the wheels during forward travel and hindering the operator's ability to operate the steering wheel, the front side of the aircraft is configured to be in a forward balanced state with a heavy weight. As a result, the control handle suddenly rises due to the disappearance of the drive reaction force of the wheels, making it difficult to perform steering operations, and workers who are walking along with the aircraft may rear-end the aircraft when it suddenly stops moving. It was dangerous. And again,
When the aircraft moves backwards, the drive reaction force of the wheels acts on the side that raises the control handle, so the operator must put a large amount of weight on the control handle to overcome the drive reaction force of the wheels and the weight of the front balance machine. However, when the steering clutch was disengaged to change direction, the main clutch was also disengaged, which was extremely dangerous as the driving reaction force of the wheels disappeared.

Furthermore, since the main clutch is disengaged each time the steering clutch is disengaged, it is necessary to re-engage the main clutch after the steering operation, which tends to impede efficient work.

In order to reduce the operating force when the steering clutch is disengaged, the present invention reduces the transmission torque at the main clutch in conjunction with the disengagement operation of the steering clutch. The purpose is to avoid danger due to sudden disappearance of driving reaction force, and to save time and effort during steering operations.

[Means to solve the problem]

The characteristic structure of the present invention for achieving the above object is as follows:
A steering clutch that separately connects and disconnects the drive of the left and right steering devices, and a main clutch that simultaneously connects and disconnects the drive of both of the traveling devices are provided, and the transmission of the main clutch is performed in conjunction with the disengagement operation of the steering clutch. In a clutch operating device for a walking work vehicle, the steering clutch operating system is linked to the main clutch operating system so as to automatically reduce the torque. A linkage mechanism is provided for switching the main clutch to a half-clutch state in conjunction with movement in the cutting direction within the operating range, and a return mechanism is provided for returning the main clutch to the engaged state after the steering clutch is disengaged. This configuration provides the following functions and effects.

[Function] As the main clutch is switched to a half-clutch state as the steering clutch is operated, the transmission torque at the main clutch is automatically reduced, and the operating force of the steering clutch can be reduced. Since power transmission to the main clutch is not completely cut off, the driving reaction force of the wheels is not completely eliminated.

The main clutch is switched to a half-clutch state in conjunction with the operation of the steering clutch.
After the steering clutch is disengaged, it is energized to return to the engaged state, so after the steering operation is completed, the main clutch is automatically returned to the engaged state.

〔Effect of the invention〕

(b) Due to the above effect, it is possible to operate the steering clutch easily and easily, and it is also possible to stop the aircraft suddenly due to the loss of driving force, and to prevent the rear steering wheel from disappearing due to the loss of driving reaction force. It is easy to avoid dangers caused by sudden changes in posture.

(b) Due to the above effects, it is possible to eliminate the need for manually engaging the main clutch after the steering operation is completed, thereby further simplifying the steering operation.

(c) Due to the synergistic effects of the above, it is easy to perform work safely and efficiently.

〔Example〕

Next, examples of the present invention will be shown.

As shown in FIG. 1, a support stand 3 on which a prime mover 4 is mounted is installed in front of a transmission case 2 that pivotally supports a pair of left and right wheels 1, and a control handle 5 and a A work equipment connection hitch 6 is provided, and a power transmission belt 9 is wound around the pulley 7 of the prime mover 4 and the manual pulley 8 of the transmission case 2, as well as a reduction mechanism and a pair of left and right steering clutches in the transmission case 2. 24, the power from the prime mover 4 is transmitted to the wheels 1, thereby forming a walking tractor mainly used for agricultural work such as plowing.

The support stand 3 on which the prime mover 4 is mounted is attached to the transmission case 2 by the drive shaft 11 of the prime mover 4 using a pin 10.
It is configured to be rotatably mounted around a horizontal axis P that is parallel to , and to apply tension for transmitting power to the transmission belt 9 by the weight of the prime mover 4 .

That is, an arm portion 12 is integrally connected to the support base 3, and an arm portion 12 is integrally connected to the main clutch lever 14 of the free end side control portion 13 of the control handle 5. arm 15
are interlocked and connected by the curved lever 16 and rods 17 and 18, and when the main clutch lever 14 is swung toward the rear of the machine, the transmission belt 9 loosens as the free end side of the support base 3 rises. The structure is such that the power transmission is cut off.

In other words, the prime mover 4 itself is configured to act as a means for applying a biasing force to the entry side of the main clutch lever 14 by utilizing the biasing force due to its weight, and this prime mover 4 is configured to act as a means for applying a biasing force to the input side of the main clutch lever 14. 14 is configured as a return mechanism that automatically returns the clutch to the engaged state.

The pivot boss portion 19 of the main clutch lever 14 is provided with a stopper 2 for restricting its operational rotation range.
0, 21, and is configured such that the direction in which the main clutch lever 14 is oscillated by the weight of the motor 4 can be switched in accordance with the oscillation of the lever 14 by the action of the arm 15 and the curved rod 16, Due to the contact between the stopper 21 and the pivot shaft 23 of the steering clutch lever 22, the drive running state is maintained, and the contact between the stopper 20 and the pivot shaft 23 causes the wheel 1 to
It is configured so that the driving stopped state is maintained.

A pair of steering clutch levers 22 for separately connecting and connecting a pair of left and right steering clutches 24 disposed inside the transmission case 2 are installed at positions on both sides of the main clutch lever 14 at the same position as the main clutch lever 14. A pair of steering clutches 24 are provided on the pivot shaft 23 so as to be swingable in the direction, and the operating arm portion 25 of a pair of steering clutches 24 and the steering clutch lever 22 are interlocked via a rod 26. connect,
The structure is such that the aircraft can be steered by swinging the steering clutch lever 22.

An L-shaped pressed member 30 is integrally connected to both sides of the main clutch lever 14, and when the steering clutch lever 22 is turned and swung with respect to the pressed member 30, the main clutch lever 14 Due to the difference in the side view rocking trajectory of the steering clutch lever 22 and the steering clutch lever 22, the corresponding abutment member 29 is moved to temporarily operate the main clutch lever 14 in the engaged state in the cutting direction within its biasing range. At the end of the arm 27 that is integrally connected to the clutch lever 22,
The stopper 31 restricts escape due to contact with the pressed member 30 that occurs when the steering clutch lever 22 is disengaged, and the stopper 31 resists the ammunition 28 when the steering clutch lever 22 engages and swings. The main clutch lever 14 is swingably mounted in a state where the contact with the pressed member 30 is released and the main clutch lever 14 is not operated, and this contact member 29 and the pressed member 30 of the main clutch lever 14, An interlocking mechanism is constructed that operates the main clutch to a half-clutch state in conjunction with the disengagement operation of the steering clutch 24, so that when the steering clutch 24 is disengaged,
With the power transmitted from the prime mover 4 to the steering clutch 24 temporarily reduced, the steering clutch lever 22
The steering clutch 24 is configured so that the steering clutch 24 can be easily disengaged, and the steering clutch 24 can be easily engaged while power is being transmitted when the steering clutch 24 is engaged.

That is, when the steering clutch lever 22 and the main clutch lever 14 are interlocked, when the steering clutch lever 22 is operated to disengage, the pressed member 30 is operated so that the main clutch lever 14 is operated in the disengaged direction to a half-clutch state. The relative position with respect to the abutment member 29 is set, and the transmission torque of the main clutch is temporarily reduced in conjunction with the disengagement operation of the steering clutch 24.

As shown in the above embodiment, the main clutch utilizes the change in the weight of the prime mover 4 to
Instead of a structure in which the power transmission is intermittent, a main clutch mechanism using a tension pulley, or a mating clutch, a sliding friction clutch, etc. may be used, and the main clutch lever 14 is provided near the steering clutch lever 22. If so, various configuration changes are possible.

Further, the shape and mounting structure of the pressed member 30 and the contact member 29 can be easily modified in various ways based on conventional technology or mechanics.

The clutch operating device according to the present invention can be applied not only to walk-behind tractors but also to all walk-behind working vehicles such as other mobile agricultural machinery and construction equipment.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, in which Fig. 1 is an overall side view of the walk-behind tractor, Fig. 2 is a plan view of the control section, Fig. 3 is an enlarged side view of the main parts, and Fig. 4 shows the main parts. Fig. 5 is an enlarged perspective view of the part shown in - of Fig. 3.
FIG. 1... Operating device, 14... Main clutch lever,
22...Steering clutch device lever, 24...Steering clutch, 29, 30...Linkage mechanism.

Claims (1)

[Claims] 1. A steering clutch 24 that separately connects and disconnects the drive of the left and right traveling devices 1, and a main clutch that simultaneously connects and disconnects the drive of both the traveling devices 1 are provided, and the steering clutch 24 is connected to the disengagement operation of the steering clutch 24. A clutch operation device for a walk-behind work vehicle, wherein the operation system of the steering clutch 24 is linked to the operation system of the main clutch so as to automatically reduce the transmission torque of the main clutch, Said steering clutch 2
Coupling mechanisms 29 and 30 are provided to switch the main clutch to a half-clutch state in conjunction with the movement of the operating tool 22 in the cutting direction within the operating range of No. A clutch operating device for a walk-behind work vehicle, characterized in that it is provided with a return mechanism for returning to the original state.