JPS6256023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is equipped with a steering clutch that separately connects and disconnects the drive of the left and right traveling devices, and a main clutch that simultaneously connects and disconnects the drive of both the traveling devices, and This invention relates to a traveling type mobile agricultural machine in which a steering clutch lever and a main clutch lever for a main clutch are provided on a steering handle.

Generally, in the above-mentioned walk-behind mobile agricultural machine, a dog clutch is used as the steering clutch, and
Since the steering clutch is installed in the transmission mechanism at or near the axle, a large amount of force is required to disengage the steering 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.

However, in this type of walking-type mobile agricultural machine, in order to suppress the control handle from being pressed against the ground side by the drive reaction force of the wheels when moving forward, the front side of the machine body is weighted in a front balance state. Because the drive reaction force of the wheels disappears, the control handle suddenly rises, making it difficult to perform steering operations, and workers who are walking along with the machine may suddenly stop moving. There was a risk of a collision. Also, when the aircraft is moving backwards, the drive reaction force of the wheels acts on the side that raises the control handle, so the operator has to raise the control handle in order to overcome the drive reaction force of the wheels and the weight of the front balance machine. This meant that the driver was forced to put a lot of weight on the vehicle, but when the steering clutch was disengaged to change direction, the main clutch was also disengaged, which caused the drive reaction force of the wheels to disappear, which was extremely dangerous. .

The present invention aims to solve the above-mentioned drawbacks by a simple structural improvement.

The characteristic structure of the present invention for achieving the above object is as follows:
A member that abuts the steering clutch lever is configured to set the on/off directions of the steering clutch lever and the main clutch lever in the same direction, and to simultaneously operate the main clutch lever to the disengaged side as the steering clutch lever is disengaged. and the other main clutch lever is provided with abutted members for the abutting member, and further, the main clutch lever is moved only to a half-clutch operation position when the steering clutch lever is disengaged. so that you can't
The rocking locus of the abutting member relative to the rocking locus of the abutted member is set so that only a portion corresponding to the holding interlocking range overlaps with each other, and from this configuration, the following steps can be performed. It has the following effects.

That is, when the steering clutch lever is operated to the cutting side, the contact member attached to the steering clutch lever contacts the abutted member attached to the main clutch lever, and the main clutch lever is simultaneously operated to the cutting side. . In such a case, when the steering clutch lever is operated to the disengaged side, the main clutch lever is moved only to the anti-clutch operation position so that the main clutch lever can only be moved in relation to the rocking trajectory of the abutted member. Since the rocking locus of the abutment member is set to be shifted, the main clutch lever is returned only to the half-clutch operation position, and in this state, the steering clutch is disengaged. Then, as the steering clutch lever continues to be operated to the disengaged side, the engagement member of the steering clutch lever and the abutted member of the main clutch lever are disengaged, and the main clutch lever is restored to the engaged position. be done.

In this way, when operating the steering clutch,
Since the disengagement operation is performed with the main clutch in a half-clutch state, the drive reaction force of the wheels does not completely disappear and the aircraft does not stop, making it possible to turn the aircraft, correct meandering,
Furthermore, it becomes possible to safely drive in reverse.

Also, since the levers are connected to each other, for example, the
As shown in the technique disclosed in the publication, compared to the case where the linkage mechanism connecting the steering clutch and the steering clutch lever is branched from the middle of the linkage mechanism to the main clutch, the main clutch is set to a half-clutch. A linkage mechanism for disengaging the steering clutch can be easily constructed.

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 drive pulley 7 of the prime mover 4 and the input pulley 8 of the transmission case 2, as well as a reduction mechanism in the transmission case 2 and a pair of left and right steering wheels. The tractor is configured to transmit power from the prime mover 4 to the wheels 1 via the clutch 24, and constitutes a walk-behind 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 drive shaft 1 of the prime mover 4 by a pin 10 to the transmission case 2.
It is mounted rotatably around the horizontal axis P parallel to 1.
It is configured so that the weight of the prime mover 4 applies tension to the transmission belt 9 for transmission.

An arm portion 12 integrally connected to the support base 3
An arm 15 is integrally connected to the main clutch lever 14 of the free end side control section 13 of the control handle 5.
are interlocked and connected by the curved rod 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. It is configured so that power transmission is cut off.

The pivot boss portion 19 of the main clutch lever 14 is provided with a stopper 2 for restricting its operational rotation range.
0 and 21 are provided, and the main clutch lever 1 is activated by the weight of the motor 4 through the action of the arm 15 and the curved rod 16.
4 is configured so that the rocking biasing direction of the lever 14 is switched in accordance with the rocking of the lever 14, and the drive running state is maintained by the contact between the stopper 21 and the pivot shaft 23 of the steering clutch lever 22. and the wheel 1 is moved by the contact between the stopper 20 and the pivot shaft 23
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 provided on the upper part of the transmission case 2 are interlocked with the steering clutch lever 22 and the operating arm 25 via a rod 26. However, the structure is such that the aircraft can be steered by swinging the steering clutch lever 22.

L-shaped abutted members 30 are integrally connected to both sides of the main clutch lever 14, and the main clutch is rotated with respect to the abutted members 30 as the steering clutch lever 22 is turned and swung. Due to the difference in the rocking trajectories of the lever 14 and the steering clutch lever 22 in side view, the main clutch lever 14 is in the engaged state.
An abutment member 29 is attached to an end of an arm 27 that is integrally connected to the steering clutch lever 22 so as to temporarily operate the steering clutch lever 22 in the cutting direction in its biasing range. The stopper 3 prevents escape due to contact with the abutted member 30.
1, and when the steering clutch lever 22 engages and swings, the main clutch lever 14 is operated by resisting the projectile 28 and releasing the contact by hitting the abutted member 30. When the steering clutch lever 24 is disengaged, the power transmission from the prime mover 4 to the steering clutch 24 is temporarily reduced, and the steering clutch lever 22 is lightly disengaged. so that you can operate
In addition, when the steering clutch 24 is engaged, it is configured so that it is easy to engage the steering clutch 24 while power is being transmitted.

In other words, 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 main clutch lever 14 is operated in the disengaged direction to the half-clutch state. The relative position with the abutment member 29 is set so that the transmission torque of the main clutch is temporarily reduced in conjunction with the disengagement operation of the steering clutch 24.

Instead of constituting the main clutch, which uses its own weight to intermittently transmit power from the transmission belt 9 to the prime mover 4, a main clutch mechanism using a tension pulley,
Alternatively, the clutch may be configured with an interlocking clutch, a sliding friction clutch, etc., and various configuration changes are possible as long as the main clutch lever 14 is provided near the steering clutch lever 22.

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

The walking type mobile agricultural machine according to the present invention can be applied not only to a walking type tractor but also to other walking type mobile agricultural machines.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking type mobile agricultural machine according to the present invention, and FIG. 1 is an overall side view of the walking type tractor;
Figure 2 is a plan view of the control section, Figure 3 is an enlarged side view of the main parts, Figure 4 is an enlarged perspective view of the main parts, and Figure 5 is an enlarged perspective view of the main parts.
The figure is a sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Traveling device, 14... Main clutch operating lever, 22... Steering clutch operating lever, 24...
Steering clutch, 29...Abutting member, 30...Abutted member.

Claims (1)

[Claims] 1. A steering clutch lever 2 for the steering clutch 24 is equipped with 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.
2, 22 and a main clutch lever 14 for the main clutch are provided on the steering handle.
2 and the main clutch lever 14 are set in the same direction, and the steering clutch lever 2 and the main clutch lever 14 are set in the same direction.
2 and 22, the main clutch lever 1
4 to the cut side at the same time, the steering clutch levers 22, 22 are provided with abutting members 29, 29, and the other main clutch lever 14 is provided with abutting members 29, 29,
Abutted members 30 are provided for each of the contact members 9, and further,
The contact with the rocking locus of the abutted member 30 is adjusted so that the main clutch lever 14 can only be brought to the half-clutch operation position when the steering clutch levers 22, 22 are disengaged. A traveling type mobile agricultural machine characterized in that the rocking trajectories of the members 29 are set so as to be shifted from each other so that only a portion corresponding to the carrying interlocking range overlaps with each other.