JP2001165194A - Hydraulic clutch release bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a leak of oil, by individually providing a seal member slide abutting to an outer/inner cylinder member to stabilize behavior of a lip of each seal member, in a hydraulic clutch release bearing device. SOLUTION: This hydraulic clutch release bearing, having an annular cylinder part formed by an inner/outer cylinder member respectively fixed to a clutch housing to be provided in an external periphery of a clutch main shaft and an annular piston fitted into the annular cylinder part to act in a release bearing by a pressure of oil to perform interrupting action of a clutch, is characterized by fixedly fitting a flat metal cylinder 7 protruded in an axial direction by a prescribed distance from a piston internal end part 6a to an external peripheral surface of the piston 6 also providing a first seal member 8 formed with a lip 8a slide abutting to the inner cylinder member 4 in an internal peripheral surface of an axial direction protruded part 7a of this metal cylinder 7 and a second seal member 9 formed with a lip 9a slide abutting to an external peripheral surface of the metal cylinder 7 in the outer cylinder member 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic clutch release bearing device used, for example, for connecting and disconnecting a clutch of an automobile.

[0002]

2. Description of the Related Art Conventionally, a hydraulic clutch release bearing device shown in FIG. 3 is known. Reference numeral 30 denotes an annular cylinder portion provided on the outer periphery of the clutch main shaft 31,
Radial mounting surface 33 for clutch housing 32
a and 34a, respectively, and an outer cylinder member 34 made of an aluminum alloy, and a cylinder space 3 between the two cylinder members 33 and 34.
An annular piston 35 made of synthetic resin is fitted into Oa so as to be slidable in the axial direction. A rubber seal member 36 for sealing the cylinder space 30a is mounted on an end surface of the end portion 35a of the annular piston 35 in the cylinder space 30a. The seal member 36 is provided with an outer diameter lip 36a that slides on the inner peripheral surface of the outer cylinder member 34 and an inner diameter lip 36b that slides on the outer peripheral surface of the inner cylinder member 33.

A release bearing 37 for engaging and disengaging a clutch is disposed at an end 35b of the annular piston 35 outside the cylinder space 30a. This release bearing 37
Is rotated in contact with a clutch lever (not shown). A compression spring 38 is provided between the outer cylinder member 34 and the release bearing 37 to urge the release bearing 37 to always contact a clutch lever (not shown).

Further, the outer cylinder member 34 is formed with a port 39 for introducing hydraulic oil fed from a clutch master cylinder (not shown) and an oil passage 40 opening to the cylinder portion 30. By controlling the pressure feed of the hydraulic oil from the clutch master cylinder to the cylinder section 30, the pressing force of the inner ring of the release bearing 37 against the clutch lever (not shown) is increased or decreased, so that the clutch is switched on and off.

[0005]

In the above-mentioned conventional hydraulic clutch release bearing device, the seal member 36 attached to the end 35a of the annular piston 35 has an outer lip 36a attached to the outer cylinder member 34 and an inner lip. 36b
Are in sliding contact with the inner cylinder member 33, respectively. Therefore, it is difficult to balance the interference between the inner diameter lip and the outer diameter lip. Lip contact is likely to be uneven, which may cause oil leakage.

SUMMARY OF THE INVENTION It is an object of the present invention to separately provide seal members that are in sliding contact with an outer cylinder member and an inner cylinder member, to stabilize the behavior of the lip of each seal member, and to prevent oil leakage.

[0007]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 is provided with an inner cylinder member and an outer cylinder member fixed to a clutch housing and provided on an outer periphery of a clutch main shaft. In a hydraulic clutch release bearing having an annular cylinder portion and an annular piston fitted into the annular cylinder portion and acting on the release bearing by hydraulic pressure to perform an on-off operation of the clutch, a piston inner end portion is provided on an outer peripheral surface of the piston. A first seal member having a lip formed in sliding contact with the inner cylinder member is provided on the inner peripheral surface of the axially protruding portion of the metal cylinder while fitting and fixing a flat metal cylinder projecting in the axial direction by a predetermined distance from the metal cylinder. And a second seal member having a lip formed on the outer cylinder member to be in sliding contact with the outer peripheral surface of the metal cylinder. To.

In the invention of claim 2, the first seal member is formed integrally with the metal cylinder, and the second seal member is formed integrally with the outer cylinder member. This facilitates handling and assembly.

Further, according to the third aspect of the present invention, an annular cylinder portion formed of an inner cylinder member and an outer cylinder member and provided on an outer periphery of a clutch main shaft, and a release bearing disposed on the annular cylinder portion and hydraulically provided on a release bearing. A hydraulic clutch release bearing having an annular piston acting and intermittently engaging and disengaging a clutch, wherein the inner cylinder member is fixed to a clutch housing, the outer cylinder member is fixed to the annular piston, and the inner circumference of the outer cylinder member is A fourth seal in which a third seal member having a lip formed in sliding contact with the outer peripheral surface of the inner cylinder member is mounted on the surface, and a lip formed in sliding contact with the inner peripheral surface of the outer cylinder member on the outer peripheral surface of the inner cylinder member. Attach the member, separate the third seal member and the fourth seal member in the axial direction, The spaced space, characterized in that the said annular cylinder portion.

[0010]

FIG. 1 shows an embodiment of the present invention. Reference numeral 2 denotes an annular cylinder portion provided on the outer periphery of the clutch main shaft 1 and has radial mounting portions 4a and 5b having radial mounting surfaces 4b and 5b for the clutch housing 3, respectively.
a is formed from an inner cylinder member 4 and an outer cylinder member 5 in which an annular piston 6 made of synthetic resin is axially slidably fitted in a cylinder space 2a between the two cylinder members 4 and 5. . A flat metal cylinder 7 that axially protrudes by a predetermined distance from an inner end surface 6a of the annular piston 6 in the cylinder portion 2 is fitted and fixed to the outer peripheral surface of the annular piston 6. It slides inside the outer cylinder member 5.

On the inner peripheral surface of the axially protruding portion 7 a of the metal cylinder 7, there is provided a first seal member 8 having a lip 8 a formed in sliding contact with the outer peripheral surface of the inner cylinder member 4. Further, a second seal member 9 provided with a lip 9a that is in sliding contact with the outer peripheral surface of the metal cylinder 7 is provided at the distal end portion 5c of the outer cylinder member 5. The first seal member 8 and the second seal member 9 are formed integrally with the metal cylinder 7 and the outer cylinder member 5, respectively, so that the ease of handling and assembly is improved. However, if necessary, various mounting methods are applied, such as fixing a separate seal member by press-fitting instead of integral molding.

Further, a metal plate plate 10 is erected at an outer end of the synthetic resin annular piston 6 and is integrally formed, and a release bearing 11 is mounted and held at a tip end thereof. Further, between the plate plate 10 and the radial mounting portion 5a of the outer cylinder member 5, a compression spring 12 for urging the inner ring 11a of the release bearing 11 to always contact a clutch lever (not shown) is arranged. Reference numeral 13 denotes a boot that seals the cylinder 2.

Further, a port 14 for introducing hydraulic oil pressure-fed from a clutch master cylinder (not shown) and an oil passage 14a opening to the cylinder 2 are formed in the radial mounting portion 5a of the outer cylinder member 5. . By controlling the pressure supply of the hydraulic oil from the clutch master cylinder to the cylinder section 2, the pressing force of the inner ring 11a of the release bearing 11 against the clutch lever is adjusted so that the clutch is switched on and off.

FIG. 2 shows another embodiment of the present invention. A radial mounting portion 4a having a radial mounting surface 4b for the clutch housing 3 on the outer periphery of the clutch main shaft 1.
The inner cylinder member 4 on which is formed is disposed.
Further, a synthetic resin annular piston 6 is disposed on the inner cylinder member 4 so as to be slidable in the axial direction. A plate plate 10 made of metal is erected on the annular piston 6 and is integrally formed. A release bearing 11 is mounted and held at the tip of the plate plate 10. Further, an outer cylinder member 15 made of a metal cylinder is integrally formed with the annular piston. In this embodiment, the metal plate plate 10 and the outer cylinder member 15 are formed by pressing from an integral metal plate to facilitate the integral molding with the annular piston 6, but they may be formed from separate metal plates. Things.

On the inner peripheral surface of the outer cylinder member 15, a lip 1 slidingly contacting the outer peripheral surface of the inner cylinder member 4 is provided.
The third seal member 16 formed with 6a is press-fitted. Here, 16b is a metal core. The side surface of the third seal member 16 is supported in contact with the end surface of the annular piston 6. Further, a fourth seal member 17 having a lip 17a formed in sliding contact with the inner peripheral surface of the outer cylinder member 15 is press-fitted on the outer peripheral surface of the inner cylinder member 4, and is fitted to the end of the outer cylinder member 15. To prevent the movement, a retaining ring 19 is fixed to the inner cylinder member 4 along the fourth seal member 17. Here, 17b is a metal core. The two seal members 16 and 17 are separated from each other by a predetermined distance in the axial direction, and the space formed by the separation forms the annular cylinder portion 2.

Further, a compression spring 12 for urging the inner ring 11a of the release bearing 11 to always contact a clutch lever (not shown) is provided between the plate plate 10 and the radial mounting portion 4a of the inner cylinder member 4.
Is arranged. Reference numeral 13 denotes a boot that seals the cylinder 2.

Further, the radial mounting portion 4a of the inner cylinder member 4 is formed with a port 18 for introducing hydraulic oil pressure-fed from a clutch master cylinder (not shown) and an oil passage 18a opening to the cylinder portion 2. . By controlling the hydraulic oil from the clutch master cylinder to the cylinder section 2, the inner race 1 of the release bearing 11 is controlled.
1a, the pressing force on the clutch lever is increased or decreased to disconnect or connect the clutch. In addition, the inner cylinder member 4 is formed by forming the port 18 and the oil passage 18a.
Necessary parts are appropriately divided.

In the embodiment shown in FIG. 2, the outer cylinder member 5 is formed of a metal cylinder and is integrated with the annular piston 6, so that the structure is simplified.

[0019]

According to the first aspect of the present invention, since the seal members that are in sliding contact with the outer cylinder member and the inner cylinder member are separately provided, the behavior of the lip of each seal member is stabilized, and oil leakage can be prevented.

According to the second aspect of the present invention, in addition to stabilizing the behavior of the lip of each seal member, since each seal member is integrally formed with the mounting member, handling and assembly are facilitated.

According to the third aspect of the present invention, in addition to stabilizing the behavior of the lip of each seal member, the outer cylinder member is formed of a metal cylinder and integrated with the annular piston, so that the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hydraulic clutch release bearing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a hydraulic clutch release bearing device according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional hydraulic clutch release bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch main shaft 2 Cylinder part 3 Clutch housing 4 Inner cylinder member 5 Outer cylinder member 6 Annular piston 7 Metal cylinder 8 First seal member 9 Second seal member 10 Plate plate 11 Release bearing 12 Compression spring 13 Boot 14 Port 15 Outer cylinder member 16 Third seal member 17 Fourth seal member 18 Port

Claims (3)

[Claims] 1. An annular cylinder portion formed of an inner cylinder member and an outer cylinder member fixed to a clutch housing and provided on an outer periphery of a clutch main shaft, and a release bearing which is fitted into the annular cylinder portion and hydraulically engages a release bearing. In a hydraulic clutch release bearing having an annular piston acting and intermittently engaging and disengaging a clutch, a flat metal cylinder axially projecting a predetermined distance from an inner end of the piston is fitted and fixed to an outer peripheral surface of the piston. A first seal member having a lip formed to slide on the inner cylinder member is provided on the inner peripheral surface of the axially protruding portion of the metal cylinder, and a lip sliding on the outer peripheral surface of the metal cylinder is formed on the outer cylinder member. A hydraulic clutch release bearing device comprising a second seal member. 2. The hydraulic clutch release bearing device according to claim 1, wherein the first seal member is formed integrally with a metal cylinder, and the second seal member is formed integrally with an outer cylinder member. 3. An annular cylinder portion formed of an inner cylinder member and an outer cylinder member and provided on the outer periphery of a clutch main shaft, and an intermittent operation of the clutch which is disposed on the annular cylinder portion and acts on a release bearing by hydraulic pressure. The inner cylinder member is fixed to the clutch housing, the outer cylinder member is fixed to the annular piston, and the outer peripheral surface of the inner cylinder member is fixed to the inner peripheral surface of the outer cylinder member. A third seal member having a lip that is in sliding contact with the surface is mounted, and a fourth seal member having a lip that is in sliding contact with the inner peripheral surface of the outer cylinder member is mounted on the outer peripheral surface of the inner cylinder member. The seal member and the fourth seal member are axially separated from each other, and the separated space is defined by the annular seal. A hydraulic type clary release bearing device characterized by using a cylinder portion.