JP2529131Y2 - Clutch operating structure for walking type mobile agricultural machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch operating structure of a walking type mobile agricultural machine in which a hand lever for easily performing a clutch switching operation is attached to a main clutch lever.

[0002]

2. Description of the Related Art As shown in FIG. 1, for example, a walking type mobile agricultural machine such as a cultivator has an engine 4 mounted on an upper portion of a front frame 3 fixed to a front portion of a transmission case 2 supporting a pair of left and right wheels 1. And the power is transmitted from the output shaft 5 of the engine 4 to the input shaft 6 of the transmission case 2 via the main clutch 7 so that the walking machine body 8 can be moved.

[0003] The aircraft body 8 is provided with a steering handlebar 10 facing rearward and upward. The side clutch levers 12, 12 provided below the left and right grips 11, 11 of the steering handles 10, which can be operated by gripping, are side clutches for aircraft steering, which are arranged at a connection portion between the wheels 9 and the transmission case 2. 13 and 13 respectively. Thereby, the power transmission from the engine 4 is performed by
1 are performed separately for each other, thereby enabling the turning operation of the traveling body 8.

Further, by pushing and pulling a clutch lever 14 provided in the vicinity of the grip 11 of the steering handle 10 so as to be able to swing back and forth, the tension arm 15 of the main clutch 7 is connected via a replacement wire (not shown). Rotate. At the tip of the tension arm 15, a tension roller 16 is rotatably provided. Drive pulley 17 attached to output shaft 5 of engine 4 and transmission case 2
By pressing the tension roller 16 against the transmission belt 19 wound around the driven pulley 18 attached to the input shaft 6 of the above, the transmission belt 19 is tensioned, and the power transmission state, that is, the clutch-on state. By releasing the tension, a clutch-off state is obtained.

Japanese Patent Laid-Open Publication No. Sho 64-32932 discloses a structure in which the main clutch 7 of this type of walking type mobile agricultural machine can be turned on and off by operating the grip. In the clutch operation structure described in this publication, a finger operation lever is provided separately from the clutch lever 14 near one of the grips 11, and the operator grips the grip 11 with this finger operation lever. The main clutch 7 is turned on and off by swinging up and down by finger operation in this state.

[0006]

[Problem to be solved by the invention]
No. 3,329,32 discloses a finger operating lever.
Move up and down within the clutch on / off operation range beyond the dead point. For example, a clutch-on state can be obtained by depressing the finger operation lever. However, in order to disengage the clutch, an operation of lifting the finger operation lever from below the grip 11 is required. This lifting operation is inconvenient for a clutch operation that requires quick switching. In addition, since the finger operation lever moves beyond the dead point of the operation wire, a large pulling force is required to push down and raise the finger operation lever. Therefore, the lever operation itself is also difficult.

The present invention has been devised to solve such a problem, and has a structure in which the hand lever is swung up and down and left and right within a range not exceeding the dead point of the operation wire. Another object of the present invention is to provide a clutch operation structure for a walking-type mobile agricultural machine, in which the operation of a clutch lever is light and a light clutch on / off operation is enabled.

[0008]

In order to achieve the object, a clutch operating structure for a walking-type mobile agricultural machine according to the present invention includes a support frame 30 provided near a grip 21 of a steering handle 20 of the walking-type mobile agricultural machine; An operation arm 50 having one end pivotally supported by the support frame 30; and an operation wire 6 having one end connected to a free end of the operation arm 50 and the other end connected to a clutch.
0, a pin 53 protruding in the vicinity of the free end of the operation arm 50, and one end pivotally supported by the support frame 30 in the vertical and horizontal directions so as to be pushed downward. A hand lever 40 that locks into the notch 83 of the stopper body 80 attached to the support frame 30 and releases the lock with the notch 83 when swinging in the left-right direction; The main clutch lever 7 pivotally supported by the lever 30 and swinging in the front-rear direction in connection with the hand lever 40
0, and when the hand lever 40 is pushed down, the intermediate portion of the hand lever 40 pushes down the pin 53, and the operation arm 50 is moved within a range where the operation wire 60 does not exceed the dead point DP. It is characterized in that the clutch is turned to disengage the clutch.

[0009]

According to the present invention, when the hand lever 40 is pushed downward, the intermediate portion of the hand lever 40 pushes down the pin 53, and the operation arm 50 is rotated within a range where the operation wire 60 does not exceed the dead point. The clutch is disengaged, the operation of the clutch lever 70 is light, and a light clutch engagement / disconnection operation can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

In the clutch operating structure of the present embodiment,
As shown in FIG. 2, a grip 21 is formed at an end of a steering handle 20 extending from the body of the walking-type mobile agricultural machine, and a support frame 30 is fixed to the steering handle 20 near the grip 21. The hand lever shaft 31 provided at the distal end portion of the support frame 30 has a structure in which a pair of semi-cylindrical receiving members 32, 32 are connected, and the distal end portion is rotatably inserted into the shaft member 32A. The distal end portion 41 of the hand lever 40 is rotatably sandwiched between the columnar receiving members 32, 32 around a shaft 32B. Thereby, the hand lever 40
Swings left and right about a shaft 32B inserted through the tip of the hand lever shaft 31. At this time, the swing is
This operation is performed in a state where the torque spring 33 attached to B is biased clockwise in FIG. Further, as described above, the hand lever shaft 31 itself is also rotatable in a vertical plane as shown in FIGS. Therefore, the hand lever 40 is connected to the hand lever shaft 31 that supports the distal end portion 41.
Also swings up and down around the axis of. In order to restrict the upward movement of the hand lever 40, the stopper 3
4 is provided on the side surface of the support frame 30.

One end of an operation arm 50 is rotatably supported on the support frame 30. Therefore, the free end 52 of the operation arm 50 swings in the front-rear direction about the pivot 51. At the free end 52, an end of an operation wire 60 extending from a clutch mounted on the body of the mobile agricultural machine is connected with a coupling tool 64.
Are connected via The operation wire 60 is supported by a wire receiver 62 rotatably mounted on a wire support shaft 61 fixed to the operation handle 20. Therefore, the end of the operation wire 60 moves up and down with the swing of the operation arm 50 as shown in FIG.

At a position near the free end 52, the operating arm 50
A pin 53 is provided upright. The pin 53 contacts the peripheral surface of the intermediate portion 42 of the hand lever 40. Hand lever 4
When the operation unit 43 of the “0” is pushed down by a finger to swing the hand lever 40 downward, the movement is transmitted to the operation arm 50 via the pin 53. As a result, the operation arm 50 rotates about the pivot 51 as shown in FIG. Further, the replacement arm 50 is moved forward and the hand lever 40 is moved.
A stopper 35 is provided upright on the front side of the support frame 30 to restrict downward movement of the support frame 30. Further, the operation arm 5
The downward movement of 0 is regulated by a shaft member 81 described later, so that the operation wire 60 does not move beyond the dead point DP.

On the peripheral surface of the intermediate portion 42 of the hand lever 40,
A pin 44 is provided upright. The pin 44 is fitted in a long hole 72 formed in a link arm 71 of the main clutch lever 70, as shown in FIG. The main clutch lever 70 is rotatably attached to the support frame 30 by a shaft support 73. A grip 74 is provided at the tip of the main clutch lever 70.

Further, a stopper 80 is provided at an end of the support frame 30 to restrict the vertical movement of the hand lever 40. As shown in FIG. 6, the stopper 80 is a bolt 8 fixed to a shaft member 81 erected from the support frame 30.
A stopper plate 82 rotatably connected to 1A is provided. A notch 83 into which the hand lever 40 is fitted is formed in the stopper plate 82. In FIG. 6, a torque spring 84 for urging the stopper plate 82 with a clockwise force is used.
Are attached to the mounting portion of the stopper plate 82. The stopper plate 82 supports the support plate 8 protruding from the shaft member 81.
The rotation is regulated by 1B. Therefore, the stopper plate 82 is pressed in the direction of the hand lever 40, and the engaged state between the peripheral surface of the hand lever 40 and the notch 83 is maintained.
The hand lever 40 is kept in the clutch-on position shown in FIG.

In order to ensure the engagement between the peripheral surface of the hand lever 40 and the notch 83, the notch 83 is formed in an angular shape as shown in FIG. 6 and attached to the peripheral surface of the hand lever 40. A method in which the sliding contact plate 45 is fitted into the notch 83 can be adopted. Alternatively, if the notch 83 has an inclined surface as shown in FIG. 7, the engaged state is released by operating the main clutch lever 70 alone, and the on / off operation of the clutch can be performed. At this time, the strength of the torque spring 84 is set such that the hand lever 40 does not return to the inclined surface due to the pulling force of the operation wire 60 in combination with the strength of the torque spring 33 described above. Note that the stopper plate 82 may be fixed to the shaft member 81 because the hand lever 40 swings up and down and left and right.

The downward movement of the hand lever 40 is transmitted to the operation arm 50 via the pin 53, and the operation arm 50
It is preferable to insert the collar 54 into the pin 53 as shown in FIG. Further, as shown in FIG. 8, when the cam body 46 is provided at the intermediate portion 42 of the hand lever 40, the lowering of the hand lever 40 is efficiently transmitted to the operation arm 50, and the operation arm 50
Rotate forward.

Next, the operation of the above-described clutch operation structure will be described.

When the clutch is switched by the main clutch lever 70, as shown in FIG. 2, the main clutch lever 70 inclined forward is rotated forward in the clutch-off state, as shown in FIG. The rotation of the main clutch lever 70 acts as a force for swinging the hand lever 40 downward through an engagement portion between the elongated hole 72 and the pin 44. At this time, since the pin 53 is in contact with the intermediate portion 42 of the hand lever 40, the operation arm 50 rotates rearward with the swing of the hand lever 40.

When the hand lever 40 is lowered to a predetermined position, the notch 83 of the stopper plate 82 engages with the peripheral surface of the hand lever 40 to fix the hand lever 40 at that position.
Further, the operation wire 60 connected to the free end 52 of the operation arm 50 via the connection tool 64 is pulled, and the clutch is turned on as shown in FIG.

This clutch-on operation is performed by the hand lever 40
It is also done by In this case, the operation unit 43 of the hand lever 40 in FIG. The lowering of the hand lever 40 causes the operation arm 50 to rotate in the same manner, pulling the operation wire 60 and bringing the clutch on.

When disconnecting the clutch, the hand lever 4 is held with the finger of the hand gripping the grip 21 of the operation handle 20.
A force is applied to the 0 operation unit 43 to move the hand lever 40 in the left-right direction, that is, the right direction in FIG. As a result, the hand lever 40 is released from the engagement with the notch 83, and is pushed upward by the operation arm 50 that is rotated by the pulling force of the operation wire 60. As a result, the clutch is turned off. At this time, since the operation wire 60 does not move beyond the dead point DP, the operator can switch the clutch only by moving the hand lever 40 left and right. As shown in FIG. 7, a stopper plate 82 having a notch 83 formed by an inclined surface is provided.
Is employed, the clutch-off operation is also performed by the operation of rotating the main clutch lever 70 backward.

[0023]

As described above, in the clutch operation structure of the present invention, the clutch is switched by rotating the operation arm within a range not exceeding the dead point of the operation wire. That is, the clutch can be switched from the clutch on to the clutch off by moving the hand lever in the left-right direction with a small fingertip force without requiring a large pulling force of the clutch lever. In addition, the operation of the hand lever and the main clutch lever becomes lighter, and the lighter clutch on / off operation is performed, so that the walking-type mobile agricultural machine becomes very easy to use.

[Brief description of the drawings]

FIG. 1 schematically shows a conventional walking-type mobile agricultural machine.

FIG. 2 is a side view of the clutch operation structure according to the embodiment of the present invention;

FIG. 3 is a plan view thereof.

FIG. 4 is a side view of the clutch operation structure in a clutch-on state.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a diagram showing an operation state of a stopper body.

FIG. 7 is a view showing an operation state of a stopper body in another embodiment.

FIG. 8 is a view showing a hand lever according to another embodiment.

[Explanation of symbols]

 Reference Signs List 20 control handle 21 grip 30 support frame 33,84 torque spring 40 hand lever 50 operating arm 52 free end 53 pin 60 operating wire 70 main clutch lever 80 stopper body DP dead point

Claims (1)

(57) [Scope of request for utility model registration] An operating handle for a walking type mobile agricultural machine (20).
A support frame (30) provided near the grip (21) of
An operation arm (5) having one end pivotally supported by the support frame (30).
0), an operation wire (60) having one end connected to the free end of the operation arm (50) and the other end connected to the clutch.
And a pin (53) protruding near the free end of the operation arm (50), and one end pivotally supported by the support frame (30) in the vertical and horizontal directions so as to be pushed down. When it is swung to the notch (83) of the stopper body (80) attached to the support frame (30), the notch (83)
And a main clutch lever (70) pivotally supported by the support frame (30) and swinging in the front-rear direction in connection with the hand lever (40). When the hand lever (40) is pushed down, an intermediate portion of the hand lever (40) is attached to the pin (5).
3) Press down the operating arm (50) as long as the operating wire (60) does not exceed the dead point (DP).
A clutch operating structure for a walking type mobile agricultural machine, characterized in that the clutch is rotated to disengage the clutch.