JPH0319470Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an operating structure for a walk-behind cultivator equipped with an auxiliary transmission transmission transmission of the articulating clutch type for traveling.

[Prior art]

Conventionally, the walk-behind cultivator described above has been configured to switch the auxiliary transmission transmission for traveling when the input is stopped.

[Problem that the invention attempts to solve]

Therefore, it is necessary to disengage the main clutch when increasing the traveling speed to increase work efficiency in response to changes in the tilling load, or when switching the sub-shift transmission to reduce the traveling speed to prevent engine stoppage. Because of this, the tilling rotary stops, and the drive load when starting the tilling rotary in the soil becomes large, which may cause problems such as the engine stopping.In order to prevent this, the rotary It became necessary to start the drive on the ground and then raise and lower it so that it penetrates into the soil.

The purpose of this invention is to make it possible to switch the auxiliary transmission transmission for traveling without stopping the tiller rotary, and to make it possible to easily stop the vehicle when the engine load is not sufficiently reduced regardless of the vehicle deceleration. be.

[Means to solve the problem]

The operating structure of the walk-behind cultivator according to the present invention is characterized in that the sub-shift transmission is configured to be able to be switched in the input state, the operating lever for the main clutch is provided so as to be swingable in a cross direction, and the operating lever The first operating path, the second operating path, and the third operating path for exchanging the lever between the first operating path and the second operating path are each operated by swinging the lever while the main clutch is maintained in the engaged position. The first and second operating members are freely movable and are provided in such a manner that the third operating path communicates with the clutch disengagement position of the operating lever, and are operatively connected to the auxiliary transmission transmission via a mechanical interlocking mechanism. a state in which the first operating member is moved along the first operating path by the operating lever that is swung in a direction opposite to the clutch disengaged position, and is separated from the operating lever that is operated toward the clutch disengaged position; In the first
The second operating member is disposed in the operating path and is operated to move along the second operating path by the operating lever that is swung in a direction opposite to the clutch disengaging position, and the second operating member is moved along the second operating path to the side of the clutch disengaging position. The interlocking mechanism is arranged in the second operation path in a state that it is spaced apart from the operation lever that is operated by the first operation lever.
When the operating member is operated to the side opposite to the clutch disengaged position of the first operating path, the auxiliary transmission transmission becomes a low speed transmission state and the second operating member is moved to the opposite side of the clutch disengaged position of the second operating path. and when the second operation member is operated to the opposite side of the second operation path from the clutch disengagement position, the auxiliary transmission transmission enters the high-speed transmission state and the first The mechanism operates so that the operating member is located on the side of the clutch disengagement position of the first operating path, and its functions and effects are as follows.

[Effect]

The main clutch is engaged when the operating lever is on any of the first to third operating paths, and when the operating lever is moved to the opposite side of the clutch disengaged position on the first operating path, the auxiliary transmission transmission is switched to a low-speed transmission state. When the operating lever is operated to the opposite side of the clutch release position of the second operating path, the auxiliary transmission transmission is switched to a high-speed transmission state.

By operating the lever that switches the auxiliary transmission transmission to the clutch disengaged position, the main clutch is disengaged, and the auxiliary transmission transmission is biased to one transmission state as in the case where the auxiliary transmission transmission and the operating lever are always linked. The operating lever can be separated from the first operating member and operated to the clutch disengaged position so that there is no operating resistance due to the mechanism.

Furthermore, by adopting the above-mentioned sub-shift transmission mechanism, even if the sub-shift transmission mechanism is mechanical, it is possible to shift while keeping the main clutch in the engaged position, and the interlocking with the sub-shift transmission can be maintained. It becomes possible to operate the operating lever to the clutch release position in the disconnected state.

[Effect of idea]

Therefore, it is important to adjust the running speed to improve work efficiency or reduce the engine load according to the tilling load, so that the tilling rotary remains in the driving state, that is, the engine stops. This eliminates the hassle of raising and lowering the tilling rotary, allowing for more efficient work.

Moreover, if the tilling load has not yet decreased sufficiently despite deceleration, the main clutch can be turned off with a light operating force without requiring the effort of switching levers as would be the case when the gear shift and main clutch levers are separate levers. The engine stop can now be easily and reliably prevented.

Moreover, the operating system of the sub-transmission transmission could be constructed mechanically, and could be obtained at low cost.

〔Example〕

As shown in FIG. 6, a pair of left and right wheels 1a, 1
b. A rotary tiller 4 is connected to the rear of a self-propelled machine having an engine 2, a control handle 3, etc., and power is transmitted from the self-propelled machine to the tiller 4, thereby constructing a walking-type tiller. It has been done.

In order to drive the wheels 1a, 1b and the tilling device 4, as shown in FIG. The transmission switch is freely branched and transmitted to the transmission transmission transmission 6 for the tiller and the main transmission transmission 7 for driving which can be switched to three forward speeds and one reverse speed, so that the output of the transmission transmission transmission 6 for the tiller is transmitted to the tilling rotary 4a. Then, the output of the main transmission transmission 7 for driving is transmitted to the auxiliary transmission transmission 8 for driving which can switch between high and low speeds, and the output of this auxiliary transmission transmission 8 is input to the differential mechanism 9 that can be freely defrotted. Wheel 1a side and right wheel 1b
The output branched to the left side axle 11a or the right side axle 1 via the steering clutch 10a or 10b.
1b.

The traveling sub-transmission transmission 8 is constructed as shown in FIG.

That is, the high-speed transmission gear 12 and the low-speed transmission gear 13 are connected to the output shaft 7a of the main transmission transmission transmission 7 for driving, respectively, to the differential gear case 9a of the differential mechanism 9.
The transmission wheels 14 are attached so as to be able to rotate relative to each other in a state where they engage with each other, and the speed change wheels 14 are attached so as to be able to rotate and slide together by spline engagement. Then, between each of the high-speed transmission gear 12 and the low-speed transmission gear 13 and the transmission wheel 14, a transmission wheel 14 is provided.
The clutch pawl 14a or 1 of this
4b is inserted into and removed from the recess 12a of the high-speed transmission gear 12 or the recess 13a of the low-speed transmission gear 13. 12 or low-speed transmission gear 13 to the differential mechanism 9, and the transmission wheel body 14.
When engaged with the high-speed transmission gear 12, a high-speed transmission state is established, and the gear change wheel 14 is engaged with the low-speed transmission gear 13.
When it is engaged, it becomes a low speed transmission state.

The transmission reduction ratio from the high-speed transmission gear 12 to the differential mechanism 9 and the transmission reduction ratio from the low-speed transmission gear 13 to the differential mechanism 9 are set to similar values, and the transmission wheel body 1
4 transmission gears 12 and 13 from one to the other, that is, the gear can be changed while remaining in the input state.

As shown in FIG. 4, one end of the output shaft 7a projects outward from the transmission case 15, and an inwardly expanding brake 16 for both wheels 1a and 1b is attached to this projecting end.

The main clutch 5, the auxiliary transmission transmission transmission 8 for traveling, and the brake 16 are each controlled by a single operating lever 1 disposed near the recessed portion of the operating handle 3.
7, so that linked operations can be performed based on the operation structure shown in FIGS. 1 and 2.

That is, the operating lever 17 is
The support shaft 19 attached via the lever guide 18 to
In addition, it is mounted so that it can swing in the longitudinal direction and the lateral direction of the fuselage by means of the flexibility of the outer fitting portion of the support shaft, so that a cross-swing operation is possible. Operation lever 17
The swinging tension arm 22 has its base urged to the tensioning position (ON) by the spring 21 of the main clutch 5 via the release wire 20.
and the release wire 20.
A brake operating tool 23 is attached to the main clutch side end of the
A wire guide 25 is attached to the swing operating arm 24, which moves integrally with the brake 16, and is rotatably attached to the swing operation arm 24, which is biased to the brake release position (OFF) of the brake 16, and into which the release wire 20 is slidably inserted. It is fixed in place for operation.

As shown in FIG. 3, a first
No matter where the operating lever 17 is located in the operating path 26, the second operating path 27, or the third operating path 28 in the lateral direction of the machine where the lever is exchanged between the first operating path 26 and the second operating path 27, the lever will not move. The release wire 20 is relaxed so that the release arm 22 is in the tensioning position (ON), and the main clutch 5 is
the brake operating tool 23 so that it is in the applied position and the operating arm 24 is in the brake release position (OFF).
is in a non-operating position separated from the wire guide 25 so that the brake 16 is turned off.

When the operating lever 17 is operated to the first operating position S located at the front end of the fourth operating path 29 in the longitudinal direction of the aircraft formed by the rear end of the lever guide 18, the tension arm 22 is moved to the tension release side. The release wire 20 is tensed so that it swings, the main clutch 5 is disengaged, and the brake operating tool 23 is released.
is still in the non-operating position relative to the wire guide 25 so that the brake 16 is in its off position.

When the operating lever 17 is operated to the second operating position P located on the rear end side of the fourth operating path 29, the tension arm 22 is further pulled toward the tension release side, so that the main clutch 5 is in the disengaged position. In addition, the brake operating tool 23 presses the wire guide 25 so that the operating arm 24 is in the braking position (ON), and the brake 16 is applied.

The lever 17 operated to the first operating position S or the second operating position P is moved to the locking portion 18 of the lever guide 18.
a or 18b to prevent it from being pulled back by the spring 21 and the biasing force of the brake 16, so that the main clutch 5 can be disengaged without having to maintain the lever 17. It is designed so that each can be maintained individually.

A balance link is integrally rotatably attached to the protruding part of the rotary operation shaft 8a of the sub-transmission transmission transmission 8 from the transmission case 15, and a first and second balance link are distributed and connected to both sides of the swing axis of this link 30. The first and second operating members 34 and 35, which are interlocked and connected to the sub-shift transmission transmission 8 via a mechanical interlocking mechanism 33 consisting of release wires 31 and 32, respectively, are attached to the support shaft 36 of the lever guide 18 in the longitudinal direction of the machine. It is installed so that it can swing relative to each other. Said first operating member 34
The operated portion 34a provided at the free end of the first operating path 26 is pressed and moved by the operating lever 17 which is swung in the opposite direction to the first operating position S, and It is arranged so as to enter the first operation path 26 so as to separate the path 26 from the operation lever 17 which is swung toward the first operation position S.
The operated portion 35a provided at the free end of the second operating member 35 is pressed and moved through the second operating path 27 by the operating lever 17 which is swung in the opposite direction from the first operating position S. , and second operation route 2
7 is inserted into the second operating path 27 so as to be spaced apart from the operating lever 17 which is swung toward the first operating position S. When the first operating member 34 is swung so that the operated portion 34a is located at the front end position A on the opposite side of the first operating path 26 from the first operating position S, the first release wire At this time, the swinging lever link 30 moves the second release wire 32 to the side of the transmission mechanism 8 by pulling the lever link 30 in the direction of the arrow l and swinging it so that the auxiliary transmission transmission transmission 8 enters the low-speed transmission state. by pulling the second operating member 35 so as to swing the second operating member 35 so that the operated portion 35a returns to the rear end position B, which is on the side of the first operating position S of the second operating path 27, and When the second operating member 35 is moved to the first operating position S of the second operating path 27, the operated portion 35a
When the second release wire 3 is swung to be located at the front end position C, which is the opposite side, the second release wire 3
2 pulls the take-up lever link 30 in the direction of the arrow h and performs the swing operation so that the auxiliary transmission transmission transmission 8 enters the high-speed transmission state.
The release wire 31 is pulled toward the mission 8 and the first operation member 34 is moved so that the operated part 34a is in the first position.
It is configured to perform a swinging operation so as to return to the rear end position D, which is on the side of the first operation position (S) of the operation path 26.

That is, when the operating lever 17 is operated to the third operating position L located on the front end side of the first operating path 26,
When the auxiliary transmission transmission 8 enters the low-speed transmission state and the operating lever 17 is operated to the fourth operating position H disposed on the front end side of the second operating path 27, the auxiliary transmission transmission 8 enters the high-speed transmission state.

Furthermore, the switching operation of the auxiliary transmission transmission 8 is performed by the operation lever 17 for the main clutch 5, and
In order to prevent the tilling rotary 4a from stopping, the tilling can be carried out with the main clutch 5 kept in the engaged position.

[Brief explanation of the drawing]

The drawings show an embodiment of the operating structure of the walk-behind cultivator according to the present invention, in which Fig. 1 is an interlocking system diagram, Fig. 2 is a sectional view of the auxiliary transmission transmission operation member installation part, and Fig. 3 is a diagram of the lever guide. FIG. 4 is a plan view, FIG. 4 is a partially cutaway rear view of the transmission, FIG. 5 is a transmission system diagram, and FIG. 6 is a side view of the entire walk-behind cultivator. 5... Main clutch, 8... Sub-transmission transmission transmission transmission for traveling, 17... Operating lever, 26... First operating route, 27... Second operating route, 28... Third operating route, 33... Interlocking mechanism , 34...first operating member,
35...Second operating member, S...Clutch disengagement position.

Claims (1)

[Scope of utility model registration request] This is an operating structure for a walk-behind cultivator that is provided with an auxiliary transmission transmission transmission transmission 8 for traveling of the articulating clutch type, in which the auxiliary transmission transmission 8 is configured to be able to be switched in an input state, and the operation lever 17 for the main clutch 5 is moved in a cross direction. The operating lever 1 is provided so as to be swingable.
7, the first operation route 26 and the second operation route 27, and the first operation route 26 and the second operation route 27
Each of the third operation paths 28 for changing the lever can be freely operated by swinging the lever while the main clutch 5 is maintained in the engaged position, and the third operation path 28 is in the clutch disengaged position of the operation lever 17. The first operating member 34 of the first and second operating members 34 and 35 provided in communication with the sub-transmission transmission transmission mechanism 8 and interlockingly connected to the auxiliary transmission transmission 8 via the mechanical interlocking mechanism 33 is connected to the first operating path 26. The operating lever 17 is swung to the opposite side from the clutch release position S.
The second operating member 35 is disposed in the first operating path 26 in a state that it is spaced apart from the operating lever 17 that is moved and operated by the clutch release position S, and the second operating member 35 is 2. A state in which the operating path 27 is moved by the operating lever 17 that is swung to the side opposite to the clutch disengaged position S, and is separated from the operating lever 17 that is operated toward the clutch disengaged position S. is arranged in the second operation path 27, and the interlocking mechanism 33
When the first operating member 34 is operated to the opposite side of the first operating path 26 from the clutch disengagement position S, the auxiliary transmission transmission 8 enters the low speed transmission state and the second operating member 35 is moved to the opposite side from the clutch disengaged position S. The second operation member 35 is located on the side of the clutch disengagement position S of the second operation path 27, and the second operation member 35 is
When the operating path 27 is operated to the opposite side of the clutch disengaged position S, the auxiliary transmission transmission 8 enters a high-speed transmission state, and the first operating member 34 moves to the opposite side of the clutch disengaged position S of the first operating path 26.
The operating structure of a walk-behind cultivator, which is a mechanism that operates so as to be located on the side of the field.