JP2002340028A - Hydraulic declutching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic declutching device capable of preventing air from remaining between a seal member and a piston member in assembling, and easily assembling the seal member. SOLUTION: The annular piston member 1 provided with the seal member 2 at its end part is axially slidably fitted in an annular cylinder of this hydraulic clutch disengaging device. An end part of the piston member is provided with an annular recessed groove 1b, the seal member 2 is provided with a projecting part 2a corresponding to the annular recessed groove to be fitted into the annular recessed groove 1b, and further the annular recessed groove 1b is provided with an air hole 1c communicated to the outside as an air escape part. The annular recessed groove 1b is a dovetail annular groove, and the projecting part 2a of the seal member is an inverted taper-shaped projecting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch disconnection device, and more particularly, to a hydraulic clutch disconnection device which prevents a defective assembly due to air remaining in a fitting portion when a seal member and a piston member are assembled. .

[0002] A hydraulic clutch disconnection device is disposed between a drive source such as an engine and a transmission.
For example, as shown in FIG.
0 is basically a clutch release bearing 15 that comes into contact with the inner periphery of the diaphragm spring 20, an inner cylinder member 12 fixed to the housing 21,
An outer cylinder member 13 arranged concentrically with respect to the axial center of the inner cylinder member 12 and an annular space (annular cylinder space) 14 formed between the inner cylinder member 12 and the outer cylinder member 13. An annular piston member 11 which is inserted and slidable in the axial direction, and an outer ring 15 of the clutch release bearing 15
a bearing housing 16 in which the cylindrical portion 16a at the end is buried in the piston member 11 so as to be able to move integrally with the piston member 11 in the axial direction, and the outer cylinder member 13 and the bearing housing 16 ( And a coil spring 17 arranged so that an urging force acts between the coil spring 17 and the guide flange 18).

As shown in FIG. 3, a guide flange 18 is fixedly arranged outside the outer cylinder member 13 so as to be integral with the bearing housing 16.
A boot 19 for preventing intrusion of dust and moisture is attached to the outside. An oil passage 13 a is provided in the outer cylinder member 13 so as to communicate with an annular space (annular cylinder space) 14 between the outer cylinder member 13 and the inner cylinder member 12. And at the upper end of the oil passage 13a,
A port 13b is provided through which a hydraulic oil proportional to the operating force flows in and out through a master cylinder (not shown).

The inner ring 15 of the clutch release bearing 15
The b-side is brought into contact with the inner periphery of the diaphragm spring 20, and the coil spring 17 is pressed in a compressed state by the urging force of the diaphragm spring 20, and the engine side and the transmission side are initially frictionally lined (not shown). It is attached so as to be in a power transmission state via the. Then, when hydraulic oil corresponding to the operating force flows into the annular space (cylinder) 14 between the outer cylinder member 13 and the inner cylinder member 12, the piston member 11 moves in the axial direction and the diaphragm spring 20 moves. The power transmission is interrupted by setting the outer peripheral side of the device to a non-contact state.

[0005]

The hydraulic clutch shut-off device 10 having the above-described structure is designed to prevent oil and air from leaking when the piston member 11 slides in the annular space (annular cylinder space) 14 in the axial direction. At the end of the piston member 11,
A seal member 22 is attached. In such a seal member 22, particularly in a member that slides on both the inner and outer circumferences with the counterpart member, the variation in the tension force of the inner and outer circumferential surfaces during the sliding cannot be set to exactly the same, so that the seal member is not axially moved during the sliding. If the piston member 11 does not operate in parallel with the direction, and as a result, the piston member 11 is largely moved by operating the clutch, the lip portion at the end of the outer cylinder member 13 squeezes out hydraulic oil or the like,
That is, leakage may occur. Therefore, it is often used by being fitted so that it can slide integrally with an adjacent piston member. Therefore, as shown in FIG. 4 which is an enlarged view of a portion P in FIG. 3, an annular concave portion 11a is provided in the piston member 11,
A convex portion 22 fitted to the annular concave portion 11a is provided on the seal member 22.
Although air is provided, air in the annular concave portion 11a does not escape during press-fitting, and may remain compressed or may not be incorporated properly. As described above, if air remains in the inside or if the air cannot be incorporated properly, there is a problem in that the response is deteriorated even when the clutch is operated, and the disconnection and the like of the clutch do not operate properly.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and does not allow air between the seal member and the piston member to remain during assembly, and allows the seal member to be easily assembled. It is an object of the present invention to provide a hydraulic clutch disconnection device.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is directed to
An annular piston member having a seal member attached to an end thereof is fitted into an annular cylinder space formed in the housing, and actuation of the piston member moves a clutch release bearing to operate the clutch ON / OFF. In the clutch disengagement device, an annular concave groove is formed at an end of the piston member in the annular cylinder space, and a convex portion that fits into the annular groove is formed in the seal member to fit in the annular groove. And an air escape portion is formed in the annular groove.

According to a second aspect of the present invention, the annular concave groove formed at the end of the piston member is a dovetail-shaped annular concave groove, and the convex portion of the seal member has a reverse tapered convex shape. It is characterized by being a department.

Further, the invention according to claim 3 is characterized in that the air escape portion of the groove formed at the end of the piston member is a through hole communicating from the bottom of the groove to the outside.

Further, according to a fourth aspect of the present invention, the air escape portion of the concave groove formed at the end of the piston member has an outer periphery or an inner periphery of the piston member provided at several places in the circumferential direction of the annular concave groove. It is characterized by parallel air escape grooves.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a diagram showing a first embodiment of the hydraulic clutch disconnection device of the present invention, and is an enlarged view of a state in which a seal member 2 is fitted into a piston member 1, and FIG. (B) is a diagram showing a state immediately before the seal member 2 is fitted into the piston member 1. The piston member 1 fitted with the seal member 2 is shown in FIG.
As shown in FIG. 1, an annular space 14 (hereinafter referred to as an annular cylinder space 1) formed by an inner cylinder member 12 attached to a housing 21 and an outer cylinder member 13.
4) so as to be slidable in the axial direction.

An end portion of the piston member 1 (on the side of the annular cylinder space 14 (see FIG. 3)) is provided with a dovetail-shaped annular concave groove 1b.
Is formed, and an air hole 1c as an air escape portion communicating with the annular concave groove 1b is provided in one direction (or several places) in the rear direction toward an external direction other than the outside (the annular cylinder 14). It is penetrated. The seal member 2 is formed with a so-called inverted tapered convex portion 2a bulging toward the piston member 1 in the circumferential direction. The inverted tapered convex portion 2a of the seal member 2 is fitted into the dovetail-shaped annular concave groove 1b of the piston member 1 so as to slide integrally. In addition, this convex part 2a may be an annular convex part, or may be a convex part provided in several places in the circumferential direction (in the following description, the convex part 2a is an annular convex part). In some cases, any of the convex portions provided at several places in the circumferential direction may be used.)

As described above, when the inverted tapered convex portion 2a of the seal member 2 is fitted into the dovetail-shaped annular concave groove 1b of the piston member 1, the inverted tapered convex portion 2a becomes dovetail groove. The air in the annular groove 1b penetrating into the annular groove 1b,
Although compressed by the convex portion 2a of the seal member 2, the air escapes immediately from the air hole 1c for the air escape portion. Therefore, when assembling the hydraulic clutch shut-off device, the air is not compressed. Insufficient assembly of the member 1 is prevented.

In the first embodiment, when the seal member 2 is incorporated in the piston member 1,
Air remains in the dovetail-shaped annular concave groove 1b and the air hole 1c behind, but the shoulders 2b, 2b of the seal member 2 and the end surface 1a of the piston member 1 are in close contact with each other, that is, the seal is closed. State. Further, when oil flows into the annular cylinder 14, the annular cylinder 14 is always in a high pressure state, so that the oil seals the seal member 2 with the piston member 1 end surface 1a.
And the air in the dovetail-shaped annular concave groove 1b and the air hole 1c behind does not flow into the annular cylinder space 14.

FIG. 2A is a view showing a second embodiment of the hydraulic clutch disconnection device according to the present invention, and is an enlarged view of a state in which a seal member 2 is fitted into a piston member 1. FIG. FIG. 2B is a view taken along the line XX of FIG. 2A, and FIG. 2C is a view showing a state before the seal member 2 is fitted into the piston member 1. In this embodiment, a dovetail-shaped annular concave groove 1b is formed on the end side of the piston member 1, and the outer periphery of the piston member 1 or Air escape grooves 1d, 1d, ... parallel to the inner circumference are provided. In the seal member 2, a so-called inverted tapered convex portion 2a bulging toward the piston member 1 is formed in the circumferential direction. And
The inverted tapered convex portion 2a of the seal member 2 is fitted into the dovetail-shaped annular concave groove 1b of the piston member 1.

As described above, when the inversely tapered convex portion 2a of the seal member 2 is fitted into the dovetail-shaped annular concave groove 1b of the piston member 1, the inverted tapered convex portion 2a becomes dovetail groove. The air in the annular groove 1b penetrating into the annular groove 1b,
Although compressed by the convex portion 2a of the seal member 2, the air escapes immediately to the air escape groove 1d. Therefore, when assembling the hydraulic clutch shut-off device, the air is not compressed. Insufficient assembly is avoided. In addition, the sealing member 2 is prevented from being in an insufficiently assembled state.

In the second embodiment, when the seal member 2 is incorporated in the piston member 1, air is injected into the dovetail-shaped annular concave groove 1b or the U-shaped air escape groove 1d. Although it remains, the shoulders 2b of the sealing member 2,
2b and the end surface 1a of the piston member 1 are in close contact with each other,
It becomes a seal state. Further, when oil flows into the annular cylinder space 14, the annular cylinder space 14 is always in a high pressure state, so that the oil presses the seal member 2 against the end surface of the piston member, and these dovetail-shaped annular grooves are formed. The air in the air escape groove 1d does not flow into the annular cylinder space 14.

[0018]

As described above in detail, according to the present invention, an air escape path (air hole or air escape groove) is provided in the recessed portion of the piston member to be fitted to the seal member. The air in the groove is not compressed. Therefore, the piston member and the seal member do not float in the assembled state, which facilitates assembling, eliminates assembly failure, and improves work efficiency. Also,
Defects during assembly can be eliminated without increasing costs.

[Brief description of the drawings]

FIG. 1 (A) is a view showing a first embodiment of a hydraulic clutch disconnection device of the present invention, and is an enlarged view showing a state where a seal member is fitted into a piston member;
FIG. 1B is a diagram illustrating a state immediately before the seal member 2 is fitted into the piston member 1.

FIG. 2A is a diagram showing a second embodiment of the hydraulic clutch disconnection device of the present invention, and is an enlarged view of a state where a seal member is fitted into a piston member. FIG.
FIG. 2 (B) is a view as viewed in the direction of arrows XX in FIG. 2 (A). FIG.
(C) is a figure which shows the state before fitting a seal member in a piston member.

FIG. 3 is a partial cross-sectional view in the axial direction of a conventional hydraulic clutch disconnection device.

FIG. 4 is an enlarged view of a part P in FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 piston member 1a piston member end face 1b annular concave groove 1c air hole 1d air escape groove 2 seal member 2a seal member convex portion 2b seal member shoulder 10 hydraulic clutch breaker 12 inner cylinder member 13 outer cylinder member 14 annular cylinder space

Claims (4)

[Claims] An annular piston member having a seal member attached to an end thereof is fitted into an annular cylinder space formed in a housing, and actuation of the annular piston member moves a clutch release bearing to turn on / off the clutch. In the hydraulic clutch disconnecting device configured to cause the piston, an annular groove is formed at an end of the piston member in the annular cylinder space, and a convex portion that fits into the annular groove is formed in the seal member. Fit into the annular groove, further,
A hydraulic clutch disconnection device, wherein an air escape portion is formed in the annular groove. 2. The groove according to claim 1, wherein the annular groove formed at the end of the piston member is a dovetail-shaped annular groove, and the convex part of the seal member is a reverse tapered convex part. Hydraulic clutch disconnect device. 3. The hydraulic clutch shut-off device according to claim 1, wherein the air escape portion of the groove formed at the end of the piston member is a through hole communicating from the bottom of the groove to the outside. 4. The air escape portion of the groove formed at the end of the piston member is an air escape groove provided at several places in the circumferential direction of the annular groove and parallel to the outer periphery or the inner periphery of the piston member. The hydraulic clutch cutoff device according to claim 1 or 2.