JP2590215Y2 - Sealing 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 sealing device used for, for example, a shock absorber of an automobile.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing a main part of a shock absorber to which a conventional example is applied. A guide 10 as an annular member is provided on the inner periphery of the outer cylinder 100 as a cylindrical housing.
1 is fixed. A shaft 104 is inserted into a shaft hole 103 of the guide 101. An inner cylinder 102 having a smaller diameter than the outer cylinder 100 is provided in the outer cylinder 100, and the inner cylinder 102 is fitted to a guide 101.

[0003] In this way, the inner chamber 1
05, the outer cylinder 100, the inner cylinder 102, the guide 10
1 forms an outer chamber 106 as the other chamber.

On the other hand, the outer cylinder 100 has one chamber 107 partitioned by a guide 101, and one chamber 107.
Is provided with an annular seal ring 108. Outer cylinder 10
0, an inward flange 109 is provided by caulking, and the inward flange 109 and the end face 1 of the guide 101 are provided.
10, the seal ring 108 is sandwiched and fixed in the axial direction.

[0005] The guide 101 is provided with an inclined surface 112 connecting the end surface 110 and the outer peripheral surface 111, and is provided with a pressure relief hole 113 penetrating in the axial direction.
The one chamber 107 side and the outer chamber 106 are provided with a pressure relief hole 11.
3 communicates.

The seal ring 108 has a seal main body 114 made of a rubber-like elastic body and a metal ring 115. A seal lip 116 is integrally formed on the outer peripheral side of the seal main body 114, and the seal lip 116 contacts the inner peripheral surface 117 and the inclined surface 112 of the outer cylinder 110. Further, the seal body 114 has a seal lip 118 and a dust lip 119 that contact the shaft 104, and
It has a pressure adjusting lip 121 that contacts one other end face 120.

In the above configuration, when the pressure in the inner chamber 105 increases, the pressure is increased through the shaft hole 103 to one of the chambers 10.
7 is transmitted. Then, the pressure adjusting lip 121 is elastically deformed outward and separates from the end face 120. As a result, the pressure in the one chamber 107 is reduced through the pressure relief hole 113 to the outer chamber 1.
06, the leakage of the sealing surface of the seal lip 118 due to an increase in the pressure of the one chamber 107, and the sealing lip 11
8 is prevented.

The guide 101 is formed by first forming the whole by casting, and then forming a pressure relief hole 113 by cutting using a drill such as a drilling machine.

[0009]

However, in the above-mentioned conventional example, since the guide 101 needs both the processing by casting and the cutting processing, the number of processing steps and the processing time are increased, and the manufacturing cost is increased.

The present invention has been made to solve the above-mentioned problem, and has as its object to provide a sealing device capable of manufacturing an annular member by a single processing step.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises fixing an annular member in a cylindrical housing to form one chamber and the other chamber in the housing. A seal ring is provided on one chamber side, and the seal ring is axially held and fixed between the inward flange of the housing and the end face of the annular member. The annular member has an annular shape connecting the end face and the outer peripheral surface of the annular member. A sealing surface provided with a sealing lip of a rubber-like elastic body which is in contact with the inner peripheral surface of the housing and the inclined surface of the annular member in the seal ring. A first groove is provided along the outer circumferential surface of the annular member, and a second groove is provided along the axial direction on the inclined surface of the annular member.
A third groove is provided on the inner peripheral side of the contacting seal lip,
The one chamber and the other chamber were communicated by the first groove, the second groove, and the third groove.

[0012]

[Function] Then, the first connecting the one chamber to the other chamber,
Since the second groove is provided on the end face and the outer peripheral surface of the annular member, the first and second grooves can be processed simultaneously with the casting of the annular member.

[0013]

FIG. 1 is a sectional view showing a main part of a shock absorber to which the present invention is applied. A guide 2 as an annular member is fixed to the inner periphery of the outer cylinder 1 as a cylindrical housing. A sleeve 4 is fitted in a shaft hole 3 of the guide 2, and a shaft 5 is inserted into the sleeve 4. An inner cylinder 6 having a smaller diameter than the outer cylinder 1 is provided in the outer cylinder 1, and the inner cylinder 6 is fitted to a step 7 of the guide 2. Thus, the inner chamber 8 is formed in the inner cylinder 6, and the outer cylinder 1, the inner cylinder 6, and the guide 2 form the outer chamber 9 as the other chamber. On the other hand, the outer cylinder 1 has one chamber 10 partitioned by the guide 2, and the one chamber 10 is provided with an annular seal ring (oil seal) 11. An inward flange 12 is provided at an end of the outer cylinder 1 by caulking, and the seal ring 11 is axially held and fixed between the inward flange 12 and the first end surface 13 of the guide 2. The guide 2 is provided with an inclined surface 15 connecting the first end face 13 and the outer peripheral face 14, and the first end face 13 has a radial first groove 1.
6 and a second groove 17 is provided on the outer peripheral surface 14 in the axial direction. A plurality of first grooves 16 and second grooves 17 may be arranged in the circumferential direction, or a single groove may be provided.

The seal ring 11 has a seal body 18 made of a rubber-like elastic body and a metal ring 21. A seal lip 19 is integrally formed on the outer peripheral side of the seal body 18, and the seal lip 19 is in contact with the inner peripheral surface 20 and the inclined surface 15 of the outer cylinder 1. A plurality of third grooves 22 are formed on the inner peripheral side of the seal lip 19 along the circumferential direction. First to third grooves 16, 1
The one chamber 10 side and the outer chamber 9 communicate with each other by 7 and 19.

Further, the seal body 18 has a seal lip 23 and a dust lip 24 which contact the shaft 5, and a pressure adjusting lip 26 which contacts another end face 25 of the guide 2. Note that a spring 27 is mounted on the back surface of the seal lip 23.

In the above configuration, when the pressure in the inner chamber 8 increases, the pressure is applied to one of the chambers 10 via the inner periphery of the sleeve 4.
Is transmitted to Then, the pressure adjusting lip 26 is elastically deformed outward and separates from the end face 25.

As a result, the pressure in the one chamber 10 is released to the outer chamber 9 through the first to third grooves 16, 17 and 19, and the pressure in the one chamber 10 rises to seal the seal lip 23. Surface leakage and wear of the seal lip 23 are prevented.
When the pressure in one chamber 10 decreases, the pressure adjusting lip 26
Contacts the end face 25 again by the elastic restoring force.

On the other hand, the seal lip 19 is in contact with the inner peripheral surface 20 of the outer cylinder 1 to form a seal surface. The seal body 18 includes an inward flange 12 and a first end surface 13.
Since the position corresponding to is thin, the amount of elastic deformation is small, and the caulking load by the inward flange 12 can be sufficiently applied to the seal ring 11. Therefore, the clamping force is high.

The guide 2 is entirely processed by casting. However, the first groove 16 and the second groove 17 are located on the first end face 13 and the outer peripheral face 14 of the annular member. The first groove 16 and the second groove 17 can be processed. Therefore, the number of processing steps and processing time are reduced, and the manufacturing cost can be suppressed.

[0020]

Since the present invention is constructed as described above, the first groove and the second groove of the annular member are provided on the first end surface and the outer peripheral surface of the annular member. At the same time, the first groove and the second groove can be processed. Therefore,
The number of processing steps and processing time can be reduced, and the manufacturing cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment in which the present invention is used for a shock absorber seal.

FIG. 2 is a sectional view of a main part of a conventional sealing device for a shock absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder (housing) 2 Guide (annular member) 3 Shaft hole 4 Sleeve 5 Shaft 6 Inner cylinder 7 Stepped portion 8 Inner chamber 9 Outer chamber (other chamber) 10 One chamber 11 Seal ring 12 Inward lounge 13 First End surface 14 Outer peripheral surface 15 Inclined surface 16 First groove 17 Second groove 18 Seal body 19 Seal lip 20 Inner peripheral surface 21 Metal ring 22 Third groove 23 Seal lip 24 Dust lip 25 End surface 26 Pressure adjusting lip 27 Spring

Claims (1)

(57) [Scope of request for utility model registration] 1. An annular member is fixed in a cylindrical housing so that one chamber and the other chamber are defined in the housing, and a seal ring is provided on one chamber side, and the housing faces inward. The seal ring is sandwiched and fixed in the axial direction by the flange and the end surface of the annular member, and the annular member is provided with an annular inclined surface connecting the end surface and the outer peripheral surface of the annular member,
In a sealing device provided with a seal lip of a rubber-like elastic body in contact with an inner peripheral surface of a housing and an inclined surface of an annular member in the seal ring, a first groove is formed in a radial direction on an end surface of the annular member. And a second groove is provided on the outer peripheral surface of the annular member along the supporting direction, and a third groove is provided on the inner peripheral side of the seal lip that contacts the inclined surface of the annular member . The one chamber and the other chamber communicate with each other by a groove, a second groove, and a third groove.