JP2585185Y2 - Threshing clutch operating structure of combine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing a clutch shock caused by abrupt clutch engagement in a threshing clutch of a combine.

[0002]

2. Description of the Related Art Conventionally, a threshing clutch of a combine is constructed of a belt tension type as disclosed in Japanese Utility Model Laid-Open No. 63-177137, and the on / off operation of the threshing clutch is disclosed in the publication. Although not shown, the operation lever of the threshing clutch and the tension pulley are interlocked via a tension spring that urges the tension pulley toward the belt pressing side, and the tension pulley is operated toward the belt relaxing side as the operation lever is turned. The clutch disengaged state and the clutch-engaged state in which the tension spring is deformed with the operation of the operation lever to apply the urging force to the tension pulley appear, respectively (see the structure of FIG. 1).

[0003]

In the operation structure of the threshing clutch having the above structure, when the operating lever is operated to the clutch engagement side, the urging force of the tension spring acts on the tension pulley to tension the belt. Then, when the operating lever is rapidly turned on and operated, the threshing clutch is suddenly turned on, causing a clutch shock. Clutch shock is a phenomenon that can occur in other clutches.However, in a threshing clutch in which a large load acts due to the large handling cylinder of the combine, excessive starting torque may be generated and the bevel gear on the power transmission path may be damaged. In order to prevent this, or to prevent the possibility, a design having a safety factor more than necessary is required. In particular, it is remarkable in the whole culm input type combine which has a larger torso. An object of the present invention is to eliminate the clutch shock by making the movement of the tension pulley toward the belt tension side slow even when the operation lever is rapidly entered and operated.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a flexible operating mechanism having a tension spring for urging an operating tool and a belt tension type threshing clutch toward a belt pressing side of a tension pulley. Through the operation of engaging the operating tool, the tension spring is deformed, and the urging force is applied to the tension pulley, thereby moving the tension pulley toward the belt tension side. Along with the disengagement operation of the operating tool, the application of the urging force of the tension spring to the tension pulley is released, and a clutch disengaged state allowing the return movement of the tension pulley to the belt relaxing side appears. And the lower side of the transmission path of the clutch operating force to the tension spring in the interchangeable operation mechanism. Position to provided a damper for imparting a resistance to the movement of the clutch engaging side of the tension pulley,
During the linking mechanism between the damper and the tension pulley,
A flexure is provided to allow the tension pulley to move to the clutch disengagement side beyond the operating range of the damper.

[0005]

[Operation] In other words, the moving speed of the tension pulley toward the clutch entrance side is regulated by the resistance of the damper, so that the threshing clutch is slowly connected even if the operating tool is quickly entered. become,
The clutch shock can be reduced, and inconvenience such as damage to the bevel gear can be eliminated.
Further, since the damper is provided at the lower side of the transmission path of the clutch operating force to the tension spring in a state where the resistance of the damper does not act on the operating tool, the operating tool can be operated lightly as before. . This is advantageous, for example, in that the operating force of the operating tool for engaging the clutch is not increased as compared with a means for restricting the engaging speed of the clutch by applying a damper to the operating tool itself.

Moreover, by releasing the urging force of the tension spring to the tension pulley with the cutting operation of the operating tool, the tension pulley is allowed to move to the belt relaxing side by the elastic restoring action of the belt.
In this state, the operating tool and the belt tension-type threshing clutch are interlocked via the accommodating operation mechanism configured to show the clutch disengaged state, and the damper is connected to the tension pulley and the damper in the linking mechanism. Since there is a flexible part that allows the operation of the tension pulley beyond the operating range to the clutch disengagement side, even if the tension pulley cannot be moved to the reliable disengagement position in the damper operating range, the flexible operation can be performed. The presence of the mechanism and the accommodating portion makes it possible to move the tension pulley to a reliable cutting position beyond the operating range of the damper. Further, since the tension pulley can be moved beyond the operating range of the damper by the operation of the accommodation operation mechanism and the accommodation part, a small-sized damper having a short operation stroke can be adopted. Further, by having a flexible portion between the tension pulley and the damper, the damper regulates the moving speed of the tension pulley toward the clutch engagement side to reduce clutch shock. Since the initial speed at the time of operation to the clutch engagement side is not regulated by the damper, the clutch speed is limited by the damper so that the movement speed of the tension pulley to the clutch engagement side is controlled from the reliable off position. The reaction time required for the entry operation can be shortened.

[0007]

[Effects of the Invention] Accordingly, by providing a damper for the tension pulley so as not to interfere with the operating tool, the clutch can be operated lightly and quickly, but the threshing clutch can be smoothly engaged regardless of the operating speed of the operating tool. And it is possible to eliminate problems such as lack of gears and setting of an excessive safety factor.
Furthermore, the operating tool and the threshing clutch are interlocked via the accommodating operation mechanism, and the accommodating portion is provided between the tension pulley and the damper, so that a link error between the operating tool and the threshing clutch and a stroke of the damper are provided. Regardless of the error, the tension pulley can be moved to the reliable disconnection position to ensure that the threshing clutch disengages, or the tension pulley travel range can be reduced by using a damper with a short operation stroke. It is also possible to plan.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings for the case of a whole culm type combine. FIG. 2 shows an all-culm input type combine, wherein 1 is a mowing unit, 2 is a threshing unit including a handling drum 3 and the like, 4 is a sorting unit, 5 is a crawler traveling device, and 6 is a control unit. Reference numeral 7 in FIG. 1 denotes a counter shaft to which engine power is input.
The belt 10 is wound around the input shaft 9 of the bevel gear mechanism 8 interlocked with the handle cylinder 3.
A belt tension type threshing clutch 12 is provided by including a tension pulley 11 that switches 0 to a tension state and a relaxation state. Next, the operation structure of the threshing clutch 12 will be described.

As shown in FIG. 1, a tension arm 13 for supporting the tension pulley 11 is configured to be swingable about a fulcrum P. The tension arm 13 and an operation lever 20 provided on the control unit 6 are connected to a threshing clutch. 12 are interlocked with each other via a flexible operation mechanism A for performing the on / off operation. That is, the first rod 14 and the first L-shaped crank 1 connected to the arm tip side portion of the tension arm 13
5, compression-type tension spring 16, push-pull rod 17,
The second L-shaped crank 18 and the second rod 19 constitute the accommodation operation mechanism A. In the drawing, the push-pull rod 17 is connected to the right side of the tension spring 16 and the first L-shaped crank 15 is connected to the left side of the tension spring 16 so as to be pivotally supported.
The push / pull rod 17 passes through the lower end of the first L-shaped crank 15. Further, a damper 21 for providing resistance in the direction in which the tension pulley 11 moves toward the belt tension side is provided at the tip of the arm of the tension arm 13 so as to act. The damper 21 may be a single-effect type or a double-effect type. The operation of the clutch operation will be described. When the operation lever 20 is operated to the entry side, the push-pull rod 17 is moved to the tension spring 16.
The tension arm 13 is rotated and urged clockwise by the reaction force to enter the clutch state in which the belt 10 is tensioned (the state of FIG. 1). At this time, damper 2
The action of 1 causes a resistance to act on the tension arm 13 and causes the tension arm 13 to swing at a slow speed. Therefore, even if the operation lever 20 is momentarily turned on, the energy dissipating action of the damper 21 causes the tension arm 13 to oscillate at a slow speed, and the engagement behavior of the clutch becomes gentle with little shock. Conversely, when the operating lever 20 is operated to the cut side, the push / pull rod 17 releases the compression of the tension spring 16, and the tension pulley 11 is rotated and urged in the counterclockwise direction by the elasticity of the belt 10, thereby relaxing the belt 10. The engaged clutch is released.

When the clutch is disengaged, it is necessary to sufficiently move the tension pulley 11 to the belt relaxing side.
It is conceivable that the tension pulley 11 cannot be moved to a reliable cutting position due to a link error between the tension pulley 11 and the stroke error of the damper 21, so that the push-pull rod 17 is attached to the lower end of the first L-shaped crank 15 as described above. The clutch is released by the elasticity of the belt 10 by being penetrated, and the movable rod 21a connecting hole 22 of the damper 21 formed in the tension arm 13 is formed as an elongated hole to have a function as a flexible portion. The operation lever 20
Regardless of the linkage error between the clutch and the threshing clutch 12 and the stroke error of the damper 21, the tension arm 13 can be sufficiently moved to the belt relaxation side at the time of the clutch disengagement operation. Can appear.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is an operation system diagram showing an operation structure of a threshing clutch.

FIG. 2 is a side view of the combine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Belt 11 Tension pulley 12 Threshing clutch 16 Tension spring 20 Operating tool 21 Damper 22 Flexible part A Flexible operating mechanism

Continuing on the front page (72) Shinzo Kashino, 64 Ishizukitamachi, Sakai City, Osaka Prefecture, inside Kubota Sakai Works, Ltd. 72) Inventor Shoichi Nakaya 64 Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works (56) References JP-A-62-261749 (JP, A) JP-A 57-32246 (JP, U) Kaisho 55-19873 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01F 12/56 A01F 12/58 F16H 7/12 A01D 69/00

Claims (1)

(57) [Scope of request for utility model registration] An operation tool (20) and a belt tension type threshing clutch (12) are connected to a tension pulley (11).
Bei tension spring (16) for urging the belt pressing side
The operating tool (20) through the accommodating operating mechanism (A)
The tension spring (16) is changed with the entering operation.
And the biasing force is applied to the tension pulley (11).
The tension pulley (11)
Move the clutch to the belt tension side, and
With the cutting operation of the operating tool (20), the tension
Of the tension spring (16) with respect to the pulley (11)
Release the urging force and release the tension pulley (1).
1) Clutch disengagement allowing return movement to the belt relaxation side
And the tension spring (16) in the flexible operation mechanism (A).
A damper (21) for providing resistance to the movement of the tension pulley (11) toward the clutch engagement side is provided at a portion on the lower side of the transmission path of the clutch operation force to the damper (2).
1) In the linking mechanism between the tension pulley (11) and
The tension exceeds the operating range of the damper (21).
That the pulley (11) moves to the clutch release side.
A threshing clutch operating structure of a combine provided with a permissible accommodation part (22) .