JPH0142670Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a clutch release device.

In a tractor 1 as shown in FIG.
The power is transmitted to the rear wheels 5 via a clutch within the transmission case 4 and a transmission gear within the transmission case 4. A conventional clutch release device for a tractor having such a power transmission path is as shown in FIG.

That is, a clutch device 6 is provided on the end surface of the flywheel 7 of the engine 2, and a propulsion shaft 8 is connected to the clutch 6. Reference numeral 9 denotes a partition wall of the clutch housing case 3. A shaft case 10 is fixed to the partition wall 9, and the propulsion shaft 8 is inserted through the shaft case 10. The tip of this shaft case 10 is formed into a cylindrical hub guide 11. A clutch release hub 12 is fitted onto the hub guide 11 so as to be movable in the axial direction. The hub 12 is axially movable by a clutch lever fork 13, and is configured to disconnect the clutch 6 by pushing the clutch release lever 13 with the front end surface of the hub 12. 15 is a return spring, which is interposed between the protrusion 16 of the release hub 12 and the shaft case 10.

The conventional clutch release device having the above structure had the following drawbacks.

The clutch release hub 12 is the hub guide 11
Since it is fitted externally to the shaft case 1 from the bulkhead 9,
It has been difficult to form an oil path for supplying lubricating oil to the hub 12 through the hub 12.

Since the return spring 15 was provided at an eccentric position, the hub 12 could not be moved smoothly, resulting in a twisting phenomenon.

Therefore, in order to eliminate the above-mentioned drawbacks, a clutch release device described in, for example, Japanese Utility Model Publication No. 57-47473 has been proposed.

This conventional device connects the clutch chamber connected to the engine and the transmission case located behind it through an intermediate case, and the clutch chamber has the engine crankshaft and the transmission case inside the transmission case. In a tractor that is provided with a clutch mechanism with a passive shaft that transmits power to the clutch mechanism, and a release bearing support cylinder that connects and disconnects the clutch mechanism is provided concentrically with the passive shaft, the lift release bearing support cylinder is connected to the clutch chamber. The support part extending inward from the partition wall that partitions the clutch chamber and the intermediate case is slidably inserted and supported so that its sliding surface extends from the clutch chamber to the inside of the intermediate case. A gap is provided between the outer circumferential surface of the passive shaft and the inner circumferential surface of the release bearing support cylinder to maintain the sealing function and prevent contact between the outer circumferential surface of the passive shaft and the inner circumferential surface of the release bearing support cylinder. A clutch device for a tractor, characterized in that a lubricant passage is formed that reaches the sliding surface of a bearing support cylinder.

However, in the conventional device, the release bearing support cylinder is provided so as to directly penetrate the intermediate partition wall of the clutch case, and the release bearing is provided at the front end through the partition wall, and the release bearing is returned to the rear end side. Because a spring is provided, when assembling,
After inserting the release bearing support cylinder into the partition wall, the bearing had to be fitted, making assembly difficult.

Further, the release bearing support cylinder body may be rotated through the release bearing, and there is a risk that the spring may be damaged.

Therefore, the present invention is characterized in that it provides a clutch release device that can be assembled with the front end outside the clutch case and that prevents the clutch from spinning.

Therefore, the feature is that the hub guide 30 penetrates the partition wall 31 of the clutch housing case and is detachably attached to the hub guide 30.
0, a clutch release hub 28 is inserted through the clutch release hub 28 so as to be freely movable in the axial direction and relatively rotatable, and a rotating shaft 23 is rotatably inserted through the clutch release hub 28,
A clutch 22 is provided at the front end of the rotating shaft 23, and the clutch 22 is provided with a clutch release lever 27 for turning on and off transmission of power, and the release lever 27 is connected to the release hub 2.
The release hub 28 is in contact with a thrust bearing 29 provided at the front end of the release hub 28 , and an engagement protrusion 32 is provided protruding from the rear end of the release hub 28 . A return spring 33 is fitted onto the outer periphery of the release hub 28, and a parallel surface 36 is formed on the outer periphery of the release hub 28 that extends rearward from the engagement protrusion 32, and the parallel surface 36 and the engagement protrusion 32 to prevent rotation of the release hub 28 and to prevent the release hub 28 from rotating.
8 is provided with a fork 34 for moving it in the axial direction.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

What is shown in FIG. 3 is a clutch release device 20 according to the present invention built into a tractor similar to the tractor shown in FIG. A clutch device 22 is provided on the end face of the flywheel 21. The clutch device 2
2 comprises a clutch disk 24 which is spline-coupled to the rotary shaft 23 so as to be movable in the axial direction, a pressure plate 25 which presses the disk 24 against the end surface of the flywheel 21, and the like. The pressure plate 25 is urged to press the clutch disk 24 by a spring (not shown) interposed between the plate 25 and the clutch cover 26. Reference numeral 27 denotes a release lever, and by pushing the lever 27, the pressure plate 25 moves against the spring and releases the clutch disk 24. The structure is such that the power transmission between the flywheel 21 and the clutch disk 24 is cut off when this clamping force is released.

A clutch release hub 28 is attached to the rotating shaft 23.
is fitted onto the outside to be relatively rotatable and movable in the axial direction. A thrust bearing 29 is fitted onto the tip of the clutch release hub 28, and the bearing 29 pushes the clutch release lever 27.

Hub guide 30 is attached to clutch release hub 28
is fitted onto the outside so as to be relatively movable in the axial direction, and the guide 30
is fixed to the bulkhead 31 of the clutch housing case.

A pair of left and right engaging protrusions 32 are removably fixed to the outer periphery of the clutch release hub 28 on the side opposite to the thrust bearing 29 at a predetermined distance from the end surface of the hub guide 30 by screwing or the like. A return spring 33 is interposed on the outer periphery of the hub 28 between the engaging protrusion 32 and the end face of the hub guide 30.

34 is a clutch fork, and a clutch lever shaft 35 is installed horizontally in the clutch housing case.
It is swingably fixed to. This fork 34
As shown in FIG. 4, the distal end thereof is formed into a forked shape, and the release hub 28 is fitted onto the outside, and the engagement protrusion 32 is engaged with the protrusion 32. The outer periphery of the hub 28 fitted onto the fork 34 has a parallel opposing surface 36, and rotation of the release hub 28 is prevented by engagement of the parallel opposing surface 36 and the forked portion of the fork 34.

37 is an oil hole for supplying lubricating oil, which is provided to communicate with the partition wall 31 and the hub guide 30, respectively;
Lubricating oil can be supplied between the inner peripheral surface of the hub guide 30 and the outer peripheral surface of the release hub 28.

In addition, as shown in FIG. 3, in the tractor to which the present invention is adopted, a disc spring 38 for holding down the bearing is used in the bearing portion in order to eliminate play in the axial direction of the rotating shaft 23. By removing the axial play with the disc spring 38 in this manner, the axial play caused by torque fluctuations due to the joint of the working machine or the engine is prevented, and gear noise can be prevented.

Moreover, what is shown in FIG. 5 is a schematic diagram of a transmission adopted in the tractor, in which reference numeral 39 indicates an operating lever 40 as a shift arm, 41 indicates a shift rod, a shift piece 42 is provided on the shift arm 40, and The engagement portion 4 of the operating lever 39 is attached to the piece 42.
3 is engaged, and the operating lever 39 is moved in the direction shown by the arrow a.
By rotating in the direction, the engaging portion 43 moves in the direction of arrow b.
As a result, the shift arm 40 rotates about the support shaft 44 in the direction of arrow c, and the shift rod 41 moves in the direction of arrow d, thereby performing a speed change operation.

As shown in FIG. 6, the conventional shift piece 42 was simply fitted onto the shift arm 40, which caused play. Therefore, as shown in FIGS. 7 and 8, the shift piece 42 and the shift arm 40 were fixed with a bolt 47 or a nut 48 via an end piece 45 and a washer 46.

By fixing both of them in this way, it was possible to prevent the shift piece 42 from falling and rattling.

Note that the present invention is not limited to the above embodiments.

According to the present invention, after the hub guide 30, clutch release hub 28, thrust bearing 29, and return spring 33 are integrally assembled, the hub guide 30 can be attached to the partition wall 31, thereby facilitating assembly.

Further, since the clutch release hub 28 is prevented from rotating by the fork 34, damage to the return spring 33 is prevented.

Since the engaging protrusion 32 serves both as the engaging part of the return spring 33 and the engaging part of the fork 34, excellent effects such as a simple structure are achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a tractor, Fig. 2 is a sectional view showing a conventional example, Fig. 3 is a sectional view showing an embodiment of the present invention, Fig. 4 is a sectional view taken along the line of Fig. 3, and Fig. 5 6 is a perspective view showing a transmission, FIG. 6 is a sectional view showing a conventional example, and FIGS. 7 and 8 are sectional views. 22...Clutch, 23...Rotary shaft, 27...
Release lever, 28...Release hub, 30...
...Hub guide, 31...Clutch housing case (bulkhead), 32...Engaging protrusion, 33...Return spring, 34...Fork.

Claims (1)

[Scope of utility model registration request] A hub guide 30 is attached to the partition wall 31 of the clutch housing case in a detachable manner, and the clutch release hub 2 is attached to the hub guide 30.
A rotating shaft 23 is rotatably inserted into the clutch release hub 28, and a clutch 22 is provided at the front end of the rotating shaft 23. 22 is provided with a clutch release lever 27 for turning on and off power transmission, and the release lever 27 is in contact with a thrust bearing 29 provided at the front end of the release hub 28.
A return spring 33 is fitted onto the outer circumference of the release hub 28 between the engagement protrusion 32 and the rear end of the hub guide 30. A parallel surface 36 is formed on the outer peripheral surface of the release hub 28 that extends rearward from the protrusion 32;
A clutch release characterized by being provided with a fork 34 that engages with the parallel surface 36 and the engagement protrusion 32 to prevent rotation of the release hub 28 and to move the release hub 28 in the axial direction. Device.