JPH11223226A - Clutch release bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sealing property by providing an axial protruding part for forming a non-contact sealing part with the upper end surface of an inner ring collar on a cover fixed to an outer ring and having end parts extending along the collar inside surface and cylindrical surface of the inner ring. SOLUTION: A cover 10 is fitted and fixed to the circumferential surface 6a of the cylindrical part 6 of an outer ring 1, and its free end part is extended into a substantially L-shaped section formed of a radial flange 10 laid along the inside surface 9b of the collar part 9 of an inner ring 2 and a cylindrical part 10b laid along the cylindrical part 8 of the inner ring 2, and an axial, protruding part 10c for covering the upper end surface 9a of the inner ring collar part 9 is integrally bent and formed in the middle of the cover 10. According to this, non-contact sealing parts 11, 12, 13 are formed between the axial protruding part 10c and the upper end surface 9a, between the cover 10 and the inside surface 9b, and between the cover 10 and the circumferential surface 8a of the inner ring cylindrical part 8, and these spaces are continued to form a non-contact sealing passage 14. Thus, since the passage of the non-contact sealing part between the cover fixed to the outer ring and the inner ring can be extended, the sealing property can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clutch release bearing mainly used for a clutch release mechanism of an automobile.

[0002]

2. Description of the Related Art FIG. 4 (corresponding to Japanese Utility Model Laid-Open No. 3-68629) is known as a conventional clutch release bearing of this type. This clutch release bearing has an outer race 40 and an inner race 41 press-formed from a steel plate. The outer race 40 has a raceway surface 43 of a rolling element 42 formed on an inner periphery thereof, and has a radial direction at one end (the left end in FIG. 4). A flange portion 44 that curves inward and extends toward the clutch spring 50 is formed. The inner race 41 has a raceway surface 45 of the rolling element 42 formed on the outer periphery thereof, a cylindrical portion 46 formed on a release fork (not shown) side (the right side in FIG. 4), and a radial direction at one end of the cylindrical portion 46. A flange portion 47 extending linearly outward is formed. The other end of the outer ring 40 (right side in FIG. 4)
The cover 48 extends along the inner surface 47a of the flange 47 of the inner ring 41 and the outer surface 46a of the cylindrical portion 46.
A non-contact sealing portion 49 is formed between the cover 48 and the flange portion 47 and the cylindrical portion 46 of the inner ring 41.

An elastic body 54 such as rubber is fixed to the inner ring 41 on the outer ring flange 44 side.
A contact seal 55 that forms a contact sealing portion with the inner surface of the flange 44 of the outer ring 40 is integrally formed with the outer ring 40. Further, the elastic body 54 is formed with a plurality of ribs 56 protruding at a plurality of circumferential positions on the inner peripheral surface thereof.
Accordingly, the release bearing can be held so as to be displaceable in the radial direction with respect to a cylindrical sleeve 51 described later.

Reference numeral 51 denotes a cylindrical sleeve which slides on a retainer 57, and a radially outward flange 52 is integrally formed. A flange 47 of the inner ring 41 is in contact with an inner surface of the outward flange 52, and a flange 53 with which a release fork (not shown) is in contact is integrally formed on an outer surface of the outward flange 52. Fixed.

[0005]

In the conventional clutch release bearing, a non-contact sealing portion 49 is formed between the cover 48 and the flange portion 47 and the cylindrical portion 46 of the inner race 41 to seal the bearing. However, since the length of the non-contact sealing portion 49 is short, the sealing performance cannot be sufficiently exhibited, and there is a problem that external contaminated water or the like enters the bearing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clutch release bearing having a further improved sealing performance while maintaining a non-contact sealing portion between a cover and an inner race.

[0007]

As means for solving the above-mentioned problems, in the first aspect, an outer ring having a radially inwardly extending flange formed on the clutch spring side, and a cylindrical portion being formed on the release fork side. Is formed, and an inner ring formed with a flange portion extending radially outward from the cylindrical portion,
A cover fixed to the outer ring and having an end extending along the inner surface and the cylindrical surface of the flange of the inner ring; and a clutch release bearing having a non-contact sealing portion formed between the cover and the inner ring. An axial protrusion that forms a non-contact sealing portion with the upper end surface of the flange is formed.

According to a second aspect of the present invention, in the clutch release bearing of the first aspect, a protrusion extending toward the cylindrical surface is formed at an end of the cover.

According to a third aspect of the present invention, in the clutch release bearing of the first aspect, a radially outwardly projecting portion having a space on the cylindrical surface side is formed at an end of the cover.

According to a fourth aspect of the present invention, in the clutch release bearing of the third aspect, a hole is formed in a radially outwardly protruding portion of the cover so as to communicate the inside of the bearing with the space.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, an outer ring 1 and an inner ring 2 are formed by pressing a steel plate. The outer ring 1 has a raceway surface 4 of a rolling element 3 formed on an inner periphery thereof, and one end (FIG. 1).
A flange portion 5 is formed at the left end (a left end) and extends radially inward toward the clutch spring, and a cylindrical portion 6 is formed at the other end (the right end in FIG. 1). Further, the inner race 2 has a raceway surface 7 of the rolling element 3 formed on the outer periphery and a cylindrical portion 8 formed on the release fork side (the right end in FIG. 1). Is formed. A cover 1 is provided on the outer peripheral surface 6a of the cylindrical portion 6 of the outer ring 1.
0 is fitted and fixed, and the free end of the cover 10 is
The flange 10 extends in a substantially L-shaped cross section formed by a radial flange 10a along the inner side surface 9b of the flange 9 and a cylindrical portion 10b along the cylindrical portion 8 of the inner ring 2. Axial projection 1 covering the upper end surface 9a of the
0c is integrally bent. Thereby, the axially protruding portion 10c of the cover 10 and the upper end surface 9a of the inner ring flange 9 are formed.
Non-contact sealing portions 11, 12, and 13 are formed between the cover 10, the inner surface 9b of the inner ring flange 9, and between the cover 10 and the outer peripheral surface 8a of the inner ring cylindrical portion 8, respectively. , 12 and 13 are continuous non-contact sealed passages 1
4 are formed.

Further, on the inner peripheral surface of the inner ring 2 on the outer ring flange 5 side,
An elastic body 15 made of rubber or the like is fixed.
5 is integrally formed with a contact seal 16 that forms a contact sealing portion with the inner surface of the flange 5 of the outer ring 1. Further, the elastic body 15 is formed with a plurality of ribs 17 protruding at a plurality of locations on the inner peripheral surface in the circumferential direction. So that it can be displaced.

The other components such as the cylindrical sleeve and the retainer are the same as those of the conventional structure shown in FIG.

According to the structure of FIG. 1, the length of the passage of the non-contact sealing portion can be increased, so that the sealing performance is improved.

FIG. 2 shows a second embodiment. In the cover 10 having the structure shown in FIG.
A protruding portion 18 is formed to be bent toward the outer peripheral surface 8a of the cylindrical portion 8 of the inner ring 2. The protruding portion 18 and the inner ring cylindrical portion 8 are not in contact with each other. In this embodiment, a wall is formed in the non-contact sealed passage 14 so that the non-contact sealed passage can be multi-staged, so that the sealing performance is further improved.

FIG. 3 shows a third embodiment, and FIG.
Of the cover 10, the cylindrical portion 10 of the cover 10
A projection 19 having a substantially triangular cross section is formed radially outward on b, and the internal space of the projection 19 is a grease reservoir 20. Further, a plurality of holes 21 are formed on the circumference of the protruding portion 19 to communicate the protruding portion internal space (grease reservoir) 20 and the inside of the bearing. In this embodiment, since the outer peripheral surface of the projecting portion 19 is the inclined surface 22, the grease inside the bearing is circulated and guided to the outer ring 1 side by the centrifugal force at the time of rotation of the bearing, thereby preventing the grease from leaking. Even if the grease leaks, the grease is held by the grease reservoir 20 of the cover 10, so that leakage to the outside of the bearing is prevented. Furthermore, since the projection 21 has the hole 21 formed therein, the grease stored in the grease reservoir 20 is returned to the inside of the bearing by centrifugal force when the bearing rotates, so that grease leakage to the outside of the bearing is further prevented. Is done.

[0017]

As described in detail above, since the passage length of the non-contact sealing portion between the cover fixed to the outer race and the inner race can be increased, the sealing performance is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a sectional view of a third embodiment of the present invention.

FIG. 4 is a sectional view of a conventional clutch release bearing.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outer ring 2 inner ring 3 rolling element 4 raceway surface 5 flange portion 6 cylindrical portion 7 raceway surface 8 cylindrical portion 9 flange portion 9a upper end surface 10 cover 10c axial protrusion 11, 12, 13 non-contact sealed portion 14 non-contact sealed passage 18 Projection 19 Projection 20 Grease reservoir 21 Hole 22 Inclined surface

Claims (4)

[Claims] An outer ring having a radially inwardly extending flange formed on a clutch spring side, and a cylindrical portion formed on a release fork side and a radially outwardly extending flange formed from the cylindrical portion. An inner ring, a cover fixed to the outer ring and having an end extending along the inner surface and the cylindrical surface of the flange of the inner ring, and a clutch release bearing in which a non-contact sealing portion is formed between the cover and the inner ring. To
A clutch release bearing, wherein an axial protrusion that forms a non-contact sealing portion is formed between the upper end surface of the inner ring flange and the upper end surface. 2. The clutch release bearing according to claim 1, wherein a protrusion extending toward the cylindrical surface is formed at an end of the cover. 3. The clutch release bearing according to claim 1, wherein a radially outwardly projecting portion having a space on the cylindrical surface side is formed at an end of the cover. 4. The clutch release bearing according to claim 3, wherein a hole communicating between the inside of the bearing and the space is formed in a radially outwardly projecting portion of the cover.