JPH0632838U - Sealing device - Google Patents

Abstract

(57) [Summary] [Object] To provide a sealing device capable of manufacturing an annular member by a single processing step. In a shock absorber sealing device having a guide 2 fixed in a cylindrical outer cylinder 1, a first groove 16 is provided on an end surface 13 of the guide 2 along a radial direction, and an outer peripheral surface of the guide 2 is provided. A second groove 17 is provided on the shaft 14 along the axial direction, and a third groove 22 is formed on the inner peripheral side of the seal lip 11 of the seal ring 11 held between the guide 2 and the outer cylinder 1.
The first groove 16, the second groove 17, and the third groove 22 connect the one chamber 10 and the outer chamber 9 in the outer cylinder 1 with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device used in, for example, a shock absorber of an automobile.

[0002]

[Prior art]

 FIG. 2 is a sectional view showing a main part of a shock absorber to which a conventional example is applied. A guide 101 as an annular member is fixed to the inner circumference of an outer cylinder 100 as a cylindrical housing. A shaft 104 is inserted in the 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 the guide 101.

In this way, the inner chamber 105 is formed in the inner cylinder 102, and the outer chamber 100, the inner cylinder 102, and the guide 101 form the outer chamber 106 as the other chamber.

On the other hand, the outer cylinder 100 has one chamber 107 partitioned by the guide 101, and the one chamber 107 is provided with an annular seal ring 108. An inward flange 109 is provided by caulking inside the outer cylinder 100, and the seal ring 108 is axially sandwiched and fixed by the inward flange 109 and the end surface 110 of the guide 101.

The guide 101 is provided with an inclined surface 112 connecting the end surface 110 and the outer peripheral surface 111, and a pressure relief hole 113 penetrating in the axial direction. The one chamber 107 side and the outer chamber 106 communicate with each other through a pressure relief hole 113.

The seal ring 108 has a seal 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 body 114, and the seal lip 116 is in contact with 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 which come into contact with the shaft 104, and a pressure adjusting lip 121 which comes into contact with another end surface 120 of the guide 101.

In the above structure, when the pressure in the inner chamber 105 rises, the pressure is transmitted to the one chamber 107 via the shaft hole 103. Then, the pressure adjusting lip 121 elastically deforms outward and separates from the end face 120. As a result, the pressure in the one chamber 107 is released to the outer chamber 106 via the pressure relief hole 113, and the pressure rise in the one chamber 107 causes leakage of the seal surface of the seal lip 118 and wear of the seal lip 118. Is prevented.

By the way, first, the guide 101 is formed by casting, and then the pressure relief hole 113 is formed by cutting using a drill such as a ball machine.

[0009]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, since the guide 101 requires both casting and cutting, the number of processing steps and processing time are increased, resulting in an increase in manufacturing cost.

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

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention fixes an annular member in a cylindrical housing to partition and form one chamber and the other chamber in the housing, and a seal ring is provided on one chamber side. The seal ring is clamped and fixed in the axial direction by the inward flange of the housing and the end surface of the annular member, and the annular member is provided with an annular inclined surface connecting the end surface of the annular member and the outer peripheral surface. In a sealing device having a rubber-like elastic seal lip that contacts the inner peripheral surface of the housing and the inclined surface of the annular member, a first groove is formed on the end surface of the annular member in the radial direction. A second groove is provided on the outer peripheral surface of the annular member along the axial direction, and a third groove is provided on the inner peripheral side of the seal lip, and the first groove, the second groove and the first groove are provided. With the three grooves, the one chamber and the other chamber Through.

[0012]

[Action]

 Since the first and second grooves connecting the one chamber and the other chamber are located on the end surface and the outer peripheral surface of the annular member, the first and second grooves can be processed simultaneously with the casting process of the annular member. .

[0013]

【Example】

 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 circumference of an outer cylinder 1 as a cylindrical housing. A sleeve 4 is fitted in the shaft hole 3 of the guide 2, and a shaft 5 is inserted into the sleeve 4. An inner cylinder 6 having a diameter smaller than that of the outer cylinder 1 is provided in the outer cylinder 1, and the inner cylinder 6 is fitted to the step portion 7 of the guide 2. In this way, the inner chamber 8 is formed in the inner cylinder 6, and the outer chamber 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 the end of the outer cylinder 1 by caulking, and the seal ring 11 is axially clamped and fixed by 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 surface 13 and the outer peripheral surface 14, a first radial groove 16 is provided on the first end surface 13, and the outer peripheral surface 14 is provided with a shaft. A second groove 17 is provided in the direction. A plurality of first grooves 16 and second grooves 17 may be equally arranged along the circumferential direction, or may be single.

Further, 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. On the inner peripheral side of the seal lip 19, a plurality of third grooves 22 are equally formed along the circumferential direction. One of the chambers 10 and the outer chamber 9 communicate with each other through the first to third grooves 16, 17, and 19.

Further, the seal body 18 has a seal lip 23 and a dust lip 24 which come into contact with the shaft 5, and a pressure adjusting lip 26 which comes into contact with another end surface 25 of the guide 2. A spring 27 is attached to the back surface of the seal lip 23.

In the above structure, when the pressure in the inner chamber 8 rises, the pressure is transmitted to the one chamber 10 via the inner circumference of the sleeve 4. Then, the pressure adjusting lip 26 elastically deforms 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, 19 and the pressure in the one chamber 10 rises to seal the seal lip 23. Surface leakage and seal lip 23 wear are prevented. When the pressure in one chamber 10 decreases, the pressure adjusting lip 26 again contacts the end face 25 due to 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. Further, since the seal main body 18 and the position corresponding to the inward flange 12 and the first end face 13 are formed thin, the elastic deformation amount is small, and the caulking load by the inward flange 12 is sufficiently applied to the seal ring 11. be able to. Therefore, the clamping force is high.

By the way, although the guide 2 is entirely machined by casting, since the first groove 16 and the second groove 17 are located on the first end surface 13 and the outer peripheral surface 14 of the annular member, the same processing as the processing is performed. At times, the first groove 16 and the second groove 17 can be processed. Therefore, the number of processing steps and processing time can be reduced, and the manufacturing cost can be suppressed.

[0020]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, since the first groove and the second groove of the annular member are on the first end surface and the outer peripheral surface of the annular member, it is possible to process the annular member. At the same time, the first groove and the second groove can be processed. Therefore, the processing man-hours and processing time can be reduced, and the manufacturing cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential 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 shock absorber sealing device.

[Explanation of symbols]

 1 Outer cylinder (housing) 2 Guide (annular member) 3 Shaft hole 4 Sleeve 5 Shaft 6 Inner cylinder 7 Step part 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 Sloping 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 Dustrip 25 End surface 26 Pressure adjusting lip 27 Spring

Claims (1)

[Scope of utility model registration request] 1. An annular member is fixed in a tubular housing to partition and form one chamber and the other chamber in the housing, and a seal ring is provided on the one chamber side, and the housing faces inward. The seal ring is sandwiched and fixed by the flange and the end surface of the annular member in the axial direction, and the annular member is provided with an annular inclined surface connecting the end surface of the annular member and the outer peripheral surface,
In the sealing device, wherein the seal ring is provided with a rubber-like elastic seal lip that comes into contact with the inner peripheral surface of the housing and the inclined surface of the annular member, the end surface of the annular member has a first groove along the radial direction. And a second groove is provided on the outer peripheral surface of the annular member along the axial direction, and a third groove is provided on the inner peripheral side of the seal lip, and the first groove, the second groove, and the A sealing device, wherein the one chamber and the other chamber are communicated with each other by the three grooves.