JPH0137233Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The invention provides a clutch release bearing support device,
In particular, it relates to an axial guide mechanism for a bearing.

[Prior art]

A conventional clutch for an automobile or the like has a structure as shown in FIG. 1, for example.

The rotational driving force from the crankshaft 1 of the engine is reciprocated along the axial direction by a diaphragm spring 4 supported by a clutch cover 3 fixed to the wheel 2 against a flyhole 2 integrally connected to the shaft 1. Possible pressure plate 5
are always in pressure contact via a disk 6 which is normally in a neutral state, so the disk 6 is provided at the periphery and spline-fitted to the input shaft 8 of the transmission (not shown). The rotation of the drive member 7 is transmitted to the shaft 8.

In order to isolate the rotational driving force, the driver operates a clutch pedal (not shown) to rotate the fork 9 in the direction of arrow A, and the fork 9 is slidably inserted into the front cover 11 of the clutch housing 10. The clutch release bearing (hereinafter referred to as "release bearing") 12 is pressed against the inner circumference of the diaphragm spring 4 and the outer circumference is moved in the direction of arrow B, so that the pressure plate 5 absorbs the pressure exerted by the outer circumference of the spring 4. Since the disk 6 is released and becomes free, the drive member 7 becomes neutral due to its own elasticity, and the disk 6 separates from the flywheel 2. Therefore, the input shaft 8 has no relation to the rotational driving force from the crankshaft 1.

However, in such conventional release bearing support devices, the front cover that supports the release bearing so that it slides tends to be made of aluminum to reduce weight.
Galling occurs between the sleeve of the release bearing and the front cover. Generally, a lubricant such as grease is applied to the guide surface, but even then, the lubrication performance deteriorates due to the grease flowing out, vibration and heat generation, and friction is accelerated, resulting in uneven clutch operation and worsening of the feel. is inviting.

Another problem is that the front cover is an obstacle to the demands for space savings and downsizing of bearings associated with the shift to front-wheel drive.

[Purpose of invention]

The present invention was made by focusing on the problem of tilting, and the outer ring of the support bearing of the input shaft is formed into an extended portion that extends long toward the diaphragm spring side, and the sleeve equipped with the release bearing is attached to the extended portion. By making it slide as a guide,
Provides smooth clutch operation and good operating feel,
Moreover, it is an object of the present invention to provide a lightweight and compact bearing support device that can maintain this state for a long period of time and has a compact structure.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described based on FIG. 2. Note that the same members as in the conventional example are designated by the same reference numerals, and their explanations will be omitted.

First, to describe the configuration of this release bearing support device, 21 is a release bearing, and a large cylindrical portion 22
a, small cylindrical portion 2 of the sliding sleeve 22 formed by sequentially connecting the medium cylindrical portion 22b and the small cylindrical portion 22c;
Locking edge 2 with the tip of 2c bent slightly outward
2k is fitted with a disc spring 23 to press an inward flange 24u formed at one end of an outer ring 24g, fixed to the sleeve 22, and an inner ring 24n having an outward flange 24s is fitted via a ball 24b. 24 and the sliding sleeve 22 are integrally connected.

On the other hand, the support bearing 25 that pivotally supports the input shaft 8 is fixed to the clutch housing 10 by a bolt 26 inserted into a mounting hole 25a of a bracket 25b protruding from a required location on the outer circumference of the outer ring 25g. , a long extension portion 25s is formed on the diaphragm spring 4 side. Note that 27 is a seal for the support bearing 25.

Then, the release bearing support device includes the extension portion 2.
The release bearing 21 is assembled by slidably fitting the large cylindrical part 22a onto the inner peripheral surface of the 5s, and is reciprocated in the axial direction by the fork 9 that engages with the middle cylindrical part 22b. The diaphragm spring 4 operates through the outward flange 24s of the inner ring 24n of the bearing portion 24.

Next, a second embodiment will be described based on FIG.

In this embodiment, the inner peripheral surface of the large cylindrical portion 32a of the sliding sleeve 32 of the release bearing 31 is connected to the support bearing 25.
The second embodiment is slidably fitted onto the outer peripheral surface of the extended portion 25s of the outer ring 25g, and the other configurations and functions are substantially the same as those of the first embodiment.

Next, a third embodiment will be described based on FIG. 4.

In this embodiment, in the release bearing 41, one end of the cylindrical sliding sleeve 42 integrated with the outer ring of the bearing portion is connected to the extended portion 25s of the outer ring 25g of the support bearing 25.
The other end is provided with an outward flange 42s, and the inner peripheral surface of the other end is the outer ring 44g of the bearing part 44, and the diaphragm spring 4 has an outer ring 44g. An inner ring 44n formed with an outward flange 44s that contacts and moves the inner circumference.
is assembled to the sliding sleeve 42 via the ball 44b. The other configurations and operations are almost the same as those of the first embodiment.

[Effect of idea]

As explained above, according to the present invention, the outer ring of the support bearing that is fixed to the clutch housing and pivotally supports the input shaft is provided with an elongated portion, and the sleeve, which is a part of the release bearing, is attached to the elongated portion in the axial direction. The clutch is slidably inserted into the clutch, and the extension part is used as a guide to perform reciprocating motion related to pedal operation to attach and detach the clutch.This eliminates the need for a front cover, making it difficult for automobile manufacturers to process the front cover. Not only does this eliminate the need for installation and other work processes, resulting in a significant cost reduction, but the outer ring (which has been hardened, of course) and the release bearing slide directly, so there are no sliding parts. Smooth clutch operation is obtained without galling or wear, and since there is no front cover, it is easy to make the clutch release bearing more compact, especially the radial dimension, which increases the degree of freedom in design.

In particular, since the support bearing of the input shaft is set as the sliding reference surface of the clutch release bearing,
Compared to conventional front cover standards, the clutch release bearing and input shaft have less eccentricity with respect to the rotational axis, and furthermore, the eccentricity of the flywheel and diaphragm spring connected to the shaft is also smaller. This has many advantages, such as reducing the amount of alignment of the clutch release bearing.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the main parts of a conventional clutch, FIG. 2 is a vertical cross-sectional view showing the main parts of a release bearing support device according to the first embodiment of the present invention, and FIG. FIG. 4 is a longitudinal sectional view showing the main parts of the release bearing support device of the third embodiment. 4...Diaphragm spring, 8...Input shaft, 10...Clutch housing, 21,3
1,41...Clutch release bearing, 25...Support bearing, 25g...Outer ring, 25s...Extension part, 2
2, 32, 42...Sliding sleeve.

Claims (1)

[Claims for Utility Model Registration] (1) The outer ring of the support bearing fixed to the clutch housing and pivotally supporting the input shaft of the transmission is formed with an extension portion extending toward the diaphragm spring side, and the clutch release A sliding sleeve formed integrally with the bearing or by fitting the bearing into a cylindrical sleeve is configured to be fitted and guided in the elongated portion so as to be slidable in the axial direction. Features clutch release bearing support device. (2) The clutch release bearing support device according to claim 1, wherein the sliding sleeve is guided by the outer periphery of the extended portion of the support bearing outer ring. (3) The clutch release bearing support device according to claim 1, wherein the sliding sleeve is guided by the inner periphery of the extended portion of the support bearing outer ring.