JP3239971B2 - Clutch release bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-aligning clutch release bearing device incorporated between an output shaft of an engine and a transmission.

[0002]

2. Description of the Related Art As shown in FIG. 6, a clutch release bearing device 30 is incorporated between an engine of an automobile and a transmission. The clutch release bearing device 30 is fitted on a front cover 33 projecting around an output shaft 32 of a transmission 31 so as to be slidable in the axial direction, and is supported around a fulcrum 34 by a depressing force from a clutch pedal. The fork 35 is configured to be pressed and slid at the tip (normally a forked shape) of the release fork 35 which rotates.

That is, when a clutch pedal (not shown) is depressed, a normally forked release fork 35 is engaged.
6, the clutch release bearing device 30 slides in the axial direction on the front cover 33 to press the diaphragm spring 36, and the elasticity of the diaphragm spring 36 The pressure plate 38 pressing the clutch disc 37 against the flywheel 40 separates from the clutch disc 37 to release the clutch, thereby preventing transmission of the torque of the output shaft 41 of the engine to the transmission 31 side. It has become.

As described above, the clutch release bearing device 30 has a bifurcated release from the transmission 31 side.
Since the end of the fork 35 repeatedly contacts, the contact portion tends to be worn. If wear occurs at the contact portion with the release fork 35, troubles such as an increase in the clutch depressing force and an unstable clutch depressing force occur. Therefore, as means for improving the wear resistance, a backup ring and a sliding member are interposed between the self-aligning rolling bearing and the release fork 35 (actually 3-22).
No. 579) or, as shown in FIG. 4, a flange 43a of an anvil 43 is disposed behind a self-aligning rolling bearing 42, and is held between the flange 43a and a guide plate 44 with which a fork member comes into contact. (See Japanese Unexamined Patent Publication No. Sho 62-237119), and a relay contacting a release bearing hub 47 as shown in FIG.
A structure in which a roller 49 and a leaf spring 50 are incorporated and arranged in a fork 48 (Japanese Utility Model Laid-Open No. 53-15239) has been proposed.

[0005]

The contact sliding between a release fork and a plate such as a backup ring disposed behind a clutch release bearing is a "sliding motion".
Normally, it is difficult to supply lubricant from outside. Also,
Attachment of a wear-resistant member such as a rubber bearing system is difficult to obtain accuracy and is costly, and has a problem in durability. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the sliding frictional resistance between a plate and a release fork disposed behind a bearing and to provide lubrication. An object of the present invention is to provide a clutch release bearing device that does not require replenishment of an agent.

[0006]

That is, in order to solve the above-mentioned problems, the present invention provides a cylindrical sleeve having a flange on the outer periphery and a bearing cover fixed to the cylindrical sleeve. −
Bearing holder comprising a bearing and a bearing cover of the bearing holder
In a clutch release bearing device having a rolling bearing held by a case and in contact with a diaphragm spring, a relief is formed on a side surface of the flange formed on an outer periphery of the cylindrical sleeve on a release fork side. A lubricating material holding plate in which a lubricating material which comes into contact with the fork is press-fitted and fixed, and is fixedly arranged.

[0007]

The operation when the clutch release bearing device is used as the above means will be described. When a clutch pedal (not shown) is depressed, a normally forked release fork 8 comes into contact with the oil-impregnated sintered plate 7, which is the lubricating material of the lubricating material holding plate 3,
The end (L-shaped plate 6) of the clutch release bearing device comes into contact with the diaphragm spring 36 (see FIG. 6), the clutch is released and the transmission of rotational torque is interrupted. In this way, by repeatedly operating the clutch pedal,
The release fork 8 and the oil-impregnated sintered plate 7 of the lubricating material holding plate 3 are repeatedly brought into frictional contact. Become.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view in the axial direction of a clutch release bearing device of the present invention, and FIG.
FIG. 3 is an enlarged view of a cross section of FIG. 1. This clutch release bearing device comprises a bearing holder 1, a self-aligning rolling bearing 2, for example, and a lubricating material holding plate 3 for holding an oil-impregnated sintered plate 7, which is a lubricating material. . In this case, the self-centering rolling bearing 2 includes an engine-side output shaft 41 and a transmission 31-side front cover 33.
Since the center of the shaft does not always coincide with the center of the shaft (see FIG. 6), the center of the shaft is automatically adjusted and a function of absorbing the "shift" of the shaft is provided.

Next, the bearing holder 1 has a resin-made cylindrical sleeve 11 having a flange 11a provided substantially at the center of the outer periphery.
The inner cylindrical portion 12a of the bearing cover case 12 having a substantially rectangular cross section is embedded therein, and integrated so that the plane of the flange portion 11a and the flat surface of the flange portion 12b of the bearing cover case 12 are in contact with each other. There is a configuration. The entire self-aligning rolling bearing 2 is arranged in the rectangular space S of the bearing cover case 12, but in this case, the bearing cover case 12 is provided.
An appropriate gap 10 is provided between the outer cylindrical portion 12c and the outer ring 21 of the self-aligning rolling bearing 2. This is because the self-aligning rolling bearing 2 can be moved slightly in the radial direction in accordance with the displacement between the engine-side output shaft and the transmission-side shaft as described above. Further, the bearing cover
An inner diameter flange 12d formed at an end of a cylindrical portion 12c outside the case 12, and an outer ring 21 of the self-aligning rolling bearing 2;
The leaf spring 4 is arranged between the side surfaces so that a biasing force acts between the side surfaces. Further, the self-centering rolling bearing 2
The inner diameter of the inner ring 22 outside the diaphragm spring 36
The outer periphery of the cylindrical portion 6a of the plate 6 having an L-shaped cross section which directly contacts the press-fitting.

The oil-impregnated sintered plates 7, 7 are mounted symmetrically with respect to the axis of the sleeve 11 on a flange 11a formed at the center of the outer periphery of the sleeve 11 of the bearing holder 1. The oil-impregnated sintered plate 7 is first attached to the lubricating material holding plate 3 while being pressed and fixed. That is, a concave portion 11c is formed in the flange 11a of the sleeve 11 at a position symmetrical (180 degrees opposite) to the axis so that the oil-impregnated sintered plate 7 is fitted. The fixed cylindrical portion 3a of the lubricating material holding plate 3 is fixed to the cylindrical portion 11 of the sleeve 11.
b so as to fit the oil-impregnated sintered plate 7 into the recess 11c. In this case, the sleeve cylindrical portion 1
At the tip of 1b, a circumferential convex portion 11d slightly larger than the diameter of the inner cylindrical portion 3a of the friction material holding plate 3 is formed in the radial direction, but the inner cylindrical portion of the anti-friction material holding plate 3 is formed. 3
a is pressed against the circumferential projection 11d of the sleeve cylindrical portion 11 to be elastically deformed and fitted. Thus,
The tip of the release fork 8 comes into contact with the oil-impregnated sintered plate 7.

Next, the oil-impregnated sintered plate 7 is used as an antifriction material with the release fork 8. Therefore, instead of the oil-impregnated sintered plate 7, polytetrafluoroethylene (P
A steel material coated with TFE) may be used as an antifriction material. It is also conceivable to attach each of the release forks 8 to the forked ends thereof, however, since the contact surface of the release forks 8 is a curved surface, it is difficult to attach the oil-impregnated sintered plate 7 as a sliding member. It is difficult to obtain accuracy.

The clutch relay having the above structure
The self-aligning rolling bearing 2 is arranged in a rectangular space S of a bearing cover case 12 of a bearing holder 1 and a leaf spring 4 is provided.
The outer ring 21 of the self-aligning rolling bearing 2 with one side (the flange 11
a side), the L-shaped plate 6 is press-fitted into the inner ring 22, and the lubricating material holding plate 3 in which the oil-impregnated sintered plate 7 is press-fitted and fixed is the sleeve 11 of the bearing holder 1. Attach to Thus, the transmission side front cover 33
And a diaphragm spring 36 (see FIG. 6), and the release fork 8 is brought into contact with the oil-impregnated sintered plate 7. Although the self-aligning rolling bearing is used in the embodiment, a fixed type rolling bearing may be used.

The construction of the clutch release bearing device is as described above, and the operation thereof will be described below. When a clutch pedal (not shown) is depressed, a normally bifurcated
The fork 8 comes into contact with the oil-impregnated sintered plate 7 of the friction material holding plate 3, the end (L-shaped plate 6) of the clutch release bearing device comes into contact with the diaphragm spring 36, and the clutch is released. The transmission of the rotational torque is interrupted. As described above, by repeatedly operating the clutch pedal, the release fork 8 and the oil-impregnated sintered plate 7 of the lubricating material holding plate 3 come into frictional contact repeatedly, but the oil-impregnated sintered plate 7 has a small sliding resistance. Due to the anti-friction effect, it is difficult to wear.

[0014]

Since the clutch release bearing device of the present invention has the above-described structure, it is possible to reduce the frictional resistance of the portion that slides in contact with the release fork. It is possible to prevent the pedaling force from increasing. Further, in this clutch release bearing device, the release
There is no need to replenish lubricant between the fork and the lubricating material holding plate, and maintenance is reduced.

[Brief description of the drawings]

FIG. 1 is a partial sectional view in the axial direction of a clutch release bearing device of the present invention.

FIG. 2 is a view as seen from an arrow P in FIG. 1;

FIG. 3 is an enlarged view of a cross section of FIG. 1;

FIG. 4 is a partial sectional view in the axial direction of a conventional clutch release bearing device.

FIG. 5 is an enlarged cross-sectional view of a tip portion of a release fork of a conventional clutch release bearing device.

FIG. 6 is a sectional view showing an arrangement position and a use state of a conventional clutch release bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing holding tool 11 Sleeve 11a Flange part 11b Cylindrical part 12 Bearing cover case 12a Inner diameter side cylindrical part 12b Flange part 2 Self-aligning rolling bearing 21 Outer ring 22 Inner ring 3 Friction material holding plate 4 Leaf spring 7 Oil-impregnated sintered plate 8 Release fork 10 Clearance

Claims (1)

(57) [Claims] 1. A bearing holder comprising a cylindrical sleeve having a flange on the outer periphery thereof and a bearing cover fixed to the cylindrical sleeve, and a bearing cover of the bearing holder. In a clutch release bearing device having a rolling bearing held by a case and in contact with a diaphragm spring, a release force of the flange formed on the outer periphery of the cylindrical sleeve is provided.
A clutch release bearing device comprising a friction material holding plate in which a friction material contacting with a release fork is press-fitted and fixed on a side surface of the clutch side.