JPH0640015Y2 - Work machine clutch brake operation structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a second operation in which the belt tension type clutch is disengaged by operating to the first operating position and further operated from the first operating position. The present invention relates to a clutch brake operating structure for a working machine that includes an operating tool that operates a brake of a traveling system while the clutch is set to a disengaged state when operated to a position.

[Conventional technology]

Conventionally, as an operation structure configured as described in the introduction, there are, for example, those disclosed in Japanese Utility Model Publication No. 62-108162 and Japanese Utility Model Publication No. 62-103778, and in these references, the operation tool is a pedal. In addition to being configured into a mold, by operating this pedal, you can disengage the tension type clutch for the traveling system,
Further, the operation structure is configured to operate the drum brake linked to the traveling wheels in a state where the clutch is operated by depressing the pedal.

[Problems to be solved by the invention]

However, in the structure in which the clutch and the brake are operated by such a single operation tool, even when it is desired to disengage only the clutch without operating the brake, the operation from the disengaged state of the clutch to the actuation of the brake is performed. It is difficult to understand the operation stroke between them, and when it is desired to operate in this way, the operating tool is operated once until the brake lightly starts to operate, and then the operating tool is restored a little. However, in the case of the drum brake as in the above-mentioned reference, the braking force rises at a relatively slow speed, so that it is more difficult to understand the operation range in which the operation is started.

An object of the present invention is to obtain an operation structure that can clearly grasp the disengagement operation position when only the clutch is disengaged by rational modification of the operation structure having the structure described above.

[Means for solving problems]

The characteristic configuration of the present invention for achieving the above object is to disengage a belt tension type clutch by operating to a first operating position, and to operate to a second operating position further operated from the first operating position. According to the clutch brake operation structure of the working machine including the operation tool for operating the brake of the traveling system with the clutch set to the disengaged state, the configuration described in [a] to [c] below is provided. is there.

[A] A stopper for blocking the operation of the tension arm of the clutch, which has reached a disengaged state, in the operating system between the tension arm of the clutch and the operating tool, and the operation of the tension arm is blocked by the stopper. And a flexible portion that allows the operation of the brake in this state.

[B] The operation system between the operation tool and the tension arm is provided with a spring for increasing the operation load that is elastically deformed by the operation tool in the operation area corresponding to the accommodation area of the accommodation section.

[C] The spring for increasing the operating load is a coil-shaped compression spring that is externally fitted to the operating rod provided in the operating system between the operating tool and the tension arm, and has an operating pressure when the clutch is disengaged. Is set to a spring constant different from that of the clutch energizing spring so that it can be recognized that the operating pressure is different.

[Action]

 The operation of the above characteristic configuration is as follows.

As shown in FIG. 1, the clutch (C) reaches the disengaged state by operating the operating tool (21) to the first operating position (X), and the operating tool (21) is moved to the first operating position (X). ), The operation of the tension arm (19) of the clutch (C) is blocked, and at the same time, the load of the spring (27) acts on the operating tool (21), so that the operating load is increased. Then, the operation tool (21) is operated to the second operation position (Y).

That is, when operating the operating tool (21) to the first operating position (X), the load of the spring (18) for energizing and energizing the tension arm (19) is applied to the operating tool (21), and the clutch is released. After (C) reaches the cut state, the load of the operation load increasing spring (27) set to a larger load than the spring (18) for energizing and biasing the tension arm (19) is applied to the operating tool ( 21), the operation load on the operation tool (21) changes stepwise between the first operation position (X) and the second operation position (Y) as shown in the graph of FIG. It becomes possible.

[Effect of device]

Therefore, by modifying the operation system to have flexibility and a spring, an operation structure capable of clearly grasping the clutch disengagement operation position due to a large change in the operation load was obtained.

Further, the spring for increasing the operation load is constituted by a coil-shaped compression spring externally fitted to the operation rod provided in the operation system between the operation tool and the tension arm. As in the case where the operating system between the wires is a wire and the spring for increasing the operating load is constituted by a tension spring interposed between the wires, the urging force of the spring is weakened by the extension of the wire,
The operation stroke does not change significantly, and changes in the operation load and large deviations in the operation amount are unlikely to occur.

Moreover, in the present invention, since the movement of the tension arm reaching the cut position is prevented, for example, the space required for the movement of the tension arm is set to be smaller than that of the operation system having no flexibility. It also has the effect of being able to do it.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, an engine (3) is provided at the front of a vehicle body having a pair of left and right front wheels (1) and rear wheels (2),
A driving part (4) is formed in the rear part, a mower (5) is provided between the front and rear wheels (1), (2), and the grass clippings from the mower (5) are formed in the duct ( A grass lawn mower as an example of a working machine is configured by attaching a grass collector (7) fed via 6).

As shown in FIGS. 1 and 3, a transmission case (8) for transmitting power to the rear wheels (2) is provided at the rear part of the vehicle body, and the transmission case (8) and the engine (3) are connected to each other. while,
A belt type transmission system is provided between the mower (5) and the engine (3).

That is, the engine (3) is provided with the output shaft (3a) facing downward, and the output shaft (3a) has a first output pulley (9) for the traveling system and a second output pulley () for the mower (5). 10) is attached, and the power from the second output pulley (10) is transmitted to the input pulley (12) of the mower (5) with the second belt (11) attached.

The transmission system between the input pulley (13) and the first output pulley (9) of the transmission case (8) includes upper and lower pulley members (14a) and (14b) as shown in FIG. A speed change pulley (14) and a tension pulley (15) in which two belt winding spaces are formed in the upper and lower sides with the inner pulley member (14c).
And the power from the engine (3) is wound between the first output pulley (9) and the upper winding space (A) of the speed change pulley (14) and the speed change gear. Pulley (1
It is adapted to be transmitted to the transmission case (8) via the respective first belts (17) between the lower winding space (B) of 4) and the input pulley (13) of the transmission case (8).

Further, the tension pulley (15) is for giving tension to the endless belt (16) by the urging force of the spring (18), and by operating the tension pulley (15) in the non-acting direction, The operating shaft (20) of the tension arm (19), which is also used as the operating member of the clutch (C) that shuts off the power of the transmission system for this traveling system, and which supports this tension pulley (15), is based on the operating system described below. It works together.

As shown in FIG. 4, a pedal-type operation tool (21) is provided on the left side of the step of the machine body, and as shown in FIG. 1, a swing motion provided on a shaft (22) of the operation tool (21). The arm (23) is provided with an operation rod (24) arranged at a place where the operation tool (21) and the tension arm (19) are linked to each other,
A slide member (25) slidably fitted on the operation rod (24), for increasing an operation load provided between a washer (26) provided on the operation rod (24) and the slide member (25). Of the clutch operating arm (28) for operating the operating shaft (20) by moving the spring (27) and the slide member (25) of the operating member (21) shown in FIG. ), The clutch (C) can be disengaged against the spring (18) of the tension arm (19).

Further, the transmission case (8) is provided with a drum type brake (29) for exerting a braking force on the rear wheel (2), and the operation lever (29a) of the brake (29) and the swing arm (23). ) Is provided between the rocking arm (23) and the link rod (30).
1) and a nut (32) are formed to allow the brake (29) to be operated only by operating the operating tool (21) to the second operating position (Y) shown in FIG. Has become.

Further, a stopper (33) for blocking the movement of the tension arm (19) reaching the cutting position in the cutting direction is provided so as to be fitted onto the operation rod (24), and the operation tool (21) is operated by the first operation. When a little stepping on from the position (X), the slide member (25) comes into contact with the stopper (33) to prevent the operation of the tension arm (19), and also the spring (27) for increasing the operating load. As a result of the load starting to act on the operating tool (21), an increase in the operating load causes the clutch (C).
The operator is made to recognize that is in the cut state.

Also, the spring (18) for entering and biasing the tension arm (19).
Since the spring constant of the operation load increasing spring ((27) is set to be larger than the spring constant of, the operation load with respect to the operation amount appearing on the operation tool (21) is stepwise as shown in the graph of FIG. Also, the slide member (25) functions as a flexible part.

The pulley member (14c) inside the speed change pulley (14)
Is configured to be capable of being vertically displaced along the support shaft (34) of the speed change pulley (14), and the support shaft (34) of the speed change pulley (14) is provided around the pivot support shaft (35). By being supported by the swingable bracket (36), when the bracket (36) is swing-operated, the endless belt (16) and the first belt (1)
7) The inner pulley member (14c) is deviated to a position where the respective tensions are balanced, and the gear change is performed according to the change in the belt winding radius of the upper and lower winding spaces (A) and (B) caused by the deviation. Is configured to be performed.

Incidentally, a speed change pedal (38) is connected to the swing end of the bracket (36) via a mechanical operation mechanism (37).

[Another embodiment]

In addition to the above embodiment, the present invention may use a hand lever as an operating tool, and can be applied to a rice transplanter or a carrier as a working machine.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the clutch brake operating structure of the working machine according to the present invention, FIG. 1 is a development view showing the linkage of the operating structure, and FIG. 2 is a graph showing the change of the operating load with respect to the operating amount of the operating tool. 3 is a schematic view of the transmission system, and FIG. 4 is an overall side view of the lawn mower. (18) …… Spring, (19) …… Tension arm, (21)
…… Operating tool, (23) …… Rotating arm, (24) …… Operating rod, (25) …… Interchangeable part, (27) …… Spring, (28) ……
Clutch operation arm, (29) …… Brake, (33) ……
Stopper, (C) ... Clutch, (X) ... First operation position, (Y) ... Second operation position.

Claims (1)

[Scope of utility model registration request] 1. A second operation position (Y) in a state in which a belt tension type clutch (C) is disengaged by an operation to a first operation position (X) and further operated from the first operation position (X). Is provided with an operation tool (21) for actuating the brake (29) of the traveling system while the clutch (C) is kept in the disengaged state, and also has the configuration described in [a] to [c] below. Clutch brake operation structure of the working machine. [B] The operation system between the tension arm (19) of the clutch (C) and the operating tool (21) is used to prevent the operation of the tension arm (19) of the clutch (C) that has reached the disengaged state. The stopper (33) and the interchange part (2) that allows the operation of the brake (29) while the operation of the tension arm (19) is blocked by the stopper (33).
5) and are provided. [B] In the operation system between the operation tool (21) and the tension arm (19), an operation elastically deformed by the operation tool (21) in an operation area corresponding to the accommodation area of the accommodation section (25). A spring (27) for increasing the load is provided. [C] The spring (27) for increasing the operating load is
It consists of a coil-shaped compression spring that is externally fitted to the operating rod (24) provided in the operating system between 1) and the tension arm (19), and the operating pressure is different from the operating pressure when the clutch is disengaged. The spring constant is set to be different from that of the clutch biasing spring (18) so that the above can be recognized.