Reciprocating sealing device

Abstract

Provided is a reciprocating sealing device shaped so that volume absorbing performance is improved, preventing full-surface contact of the packing from readily occurring even when there is an increase in internal pressure, and therefore an excellent sealing performance can be obtained. In order to achieve this purpose, the reciprocating sealing device is a sealing device in which a packing is mounted on a mounting groove provided to one of two members that perform a reciprocating motion relative to each other and the packing is brought into intimate contact with the other member to obtain a seal between the two members. The packing is provided with an annular base part, a stationary-side lip, and a sliding-side lip. A pack ring having a lower hardness than that of the packing is interposed between the annular base part and the groove side surface of the mounting groove. A pack ring forms a space region between the pack ring and the other member. The annular base part is shaped so that the heel part has an arc-shaped or tapered cross-section and the annular base part does not protrude beyond an extension line of a peripheral surface of the sliding-side lip in a free state. The edge surface of the annular base part is provided with a flat part within the range at which contact is made with the pack ring.

Description

technical field [0001] The invention relates to a sealing device related to sealing technology. More specifically, the present invention relates to a sealing device for reciprocating motion. The sealing device of the present invention is used, for example, in a shock absorber mechanism for automobiles, or in other shock absorber mechanisms. Background technique [0002] Previously, it was known that there were Figure 6 The shock absorber mechanism 51 shown in FIG. 10 is equipped with a sealing device 61 in order to seal the oil O sealed inside the shock absorber mechanism 51 . [0003] The illustrated damper mechanism 51 is composed of a damper shaft 52 having a piston 53 with an orifice 54 at its tip, and a damper housing 55 elastically supported by a spring unit 56 . A sealing device 61 is installed between the damper shaft 52 and the damper housing 55 in order to seal the oil O sealed inside the damper housing 55 . In addition, a sealing piece 71 is attached to a part...

AI Technical Summary

Problems solved by technology

[0007] (2) The portion that cannot be absorbed by the deformation of the gasket 62 causes an increase in internal pressure

[0010] (5) According to the items and configurations of (1) to (4) above, when high-frequency vibration input is used and high-viscosity oil is used, a large amount of oil leakage may occur

[0013] (a) In the conventional invention, since deformation occurs from the lip, it is disadvantageous in maintaining the wedge shape

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