JP2010281373A - Seal for absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid reduction in sealing property by damaging of a dust lip sliding surface and reduction in an interference by abnormal abrasion of a lip, by influence of muddy water and dust from an external part. <P>SOLUTION: This seal for an absorber is composed of an oil lip for sealing an annular clearance between a housing and a reciprocating shaft mutually concentrically installed to be reciprocative, integrally arranged on the inner peripheral side of an annular member held on the housing side and contacting in sealing with an outer peripheral surface of the reciprocating shaft, and a dust lip positioned outside the oil lip and contacting in sealing with the outer peripheral surface of the reciprocating shaft, and a canvas layer is arranged on the sliding surface with the reciprocating shaft of the dust lip. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorber seal, and more particularly to an absorber seal used in a rod seal portion of a shock absorber.

  Conventionally, as an absorber seal used as a shock absorber rod seal or the like, there is one as shown in FIG.

  The absorber seal shown in FIG. 4 includes an oil lip 320 and a dust lip 420 that are slidably sealingly contacted with a reciprocating shaft 200 that reciprocates, and a gasket 500 that prevents leakage from the outer diameter side. It was formed with the rubber-like elastic body adhere | attached and fixed to the annular member 310 of this (patent document 1).

In this type of conventional absorber seal, the dust lip 420 has a function of preventing muddy water and dust from entering the absorber.
However, the dust strip 420 made of a rubber-like elastic material has a reduced sealing performance due to scratches on the sliding surface of the dust strip 420 due to the influence of muddy water and dust from the outside, and a reduction in interference due to abnormal wear of the lip. Caused the problem.
In particular, in the case of an absorber seal in which a fluororesin layer is provided on the sliding surface in order to reduce the sliding resistance of the lip, the sealing performance is deteriorated due to scratches on the duster sliding surface and abnormal wear of the lip. The problem of decrease in interference was remarkable. (Patent Document 2)

Japanese Patent Laid-Open No. 2001-173797 JP 2000-161497 A

  Such an absorber seal is intended to avoid deterioration of sealing performance due to scratches on the dust lip sliding surface and reduction of interference due to abnormal wear of the lip due to the influence of muddy water and dust from the outside.

  The absorber seal of the present invention seals an annular gap between a housing and a reciprocating shaft that are assembled so as to be reciprocally concentrically with each other, and is integrated with an inner peripheral side of an annular member held on the housing side. And an oil lip that is in sealing contact with the outer peripheral surface of the reciprocating shaft, and a dust lip that is located outside the oil lip and is in sealing contact with the outer peripheral surface of the reciprocating shaft. In the absorber seal, a canvas layer is provided on a sliding surface of the dust lip with the reciprocating shaft.

The present invention has the following effects.
According to the absorber seal of the first aspect of the invention, due to the influence of muddy water and dust from the outside, the seal performance is deteriorated due to the scratching of the dust lip sliding surface, and the interference is reduced due to abnormal wear of the lip. There is nothing to do.
According to the absorber seal of the invention described in claim 2, the tight force of the dust lip can be stably maintained for a long period of time.

Further, according to the absorber seal of the third aspect of the invention, the following performance of the dust lip against the shaft eccentricity is not hindered.
Furthermore, according to the absorber seal of the invention of claim 4, the molding cost can be kept low.

It is sectional drawing of the seal for absorbers which concerns on this invention. It is sectional drawing of the state which incorporated the seal for absorbers concerning the present invention of Drawing 1. It is sectional drawing of the seal for absorbers of the other embodiment which concerns on this invention. It is sectional drawing which shows the assembly state of the other absorber seal which concerns on a prior art.

Hereinafter, the best mode for carrying out the present invention will be described.
The best mode for carrying out the invention will be described with reference to FIGS.

1 and 2, the absorber seal according to the present invention seals the annular gap between the housing 1 and the reciprocating shaft 2 assembled so as to be reciprocally concentrically with each other, and is held on the housing 1 side. An oil lip 4 that is integrally provided on the inner peripheral side of the annular member 3 and that is in sealing contact with the outer peripheral surface of the reciprocating shaft 2, and an outer peripheral surface of the reciprocating shaft 2 that is positioned outside the oil lip 4 And a dust strip 5 in sealing contact.
The absorber seal is assembled into the absorber as shown in FIG.
A canvas layer 51 is provided on the sliding surface of the dust lip 5 with the reciprocating shaft 2.
The canvas layer 51 can be integrally baked by applying rubber glue to the side of the canvas in contact with the rubber during vulcanization molding of the rubber-like elastic material dust strip 5.
Furthermore, since this canvas is bias knitted, it does not hinder the following performance of the dust lip with respect to the axial eccentricity.
FIG. 3 shows an absorber seal according to another embodiment of the present invention.
The difference from the absorber seal according to the embodiment of the present invention shown in FIG. 1 is that a garter spring 52 is attached to the dust lip 5.
As a result, the tension force of the dust lip can be stably maintained for a long time.

  The present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

1 Housing 2 Reciprocating Shaft 3 Annular Member 4 Oil Lip 5 Dustrip

Claims (4)

  The annular gap between the housing (1) and the reciprocating shaft (2) assembled so as to be reciprocally concentrically with each other is sealed, and the inside of the annular member (3) held on the housing (1) side is sealed. An oil lip (4) provided integrally on the circumferential side and in sealing contact with the outer peripheral surface of the reciprocating shaft (2), and located on the outer side of the oil lip (4), the reciprocating shaft ( 2) In an absorber seal comprising a dust lip (5) in sealing contact with the outer peripheral surface of 2), a canvas layer (51) is provided on the sliding surface of the dust lip (5) with the reciprocating shaft (2). Absorber seal characterized by being provided.   The absorber seal according to claim 1, wherein a garter spring (52) is attached to the dust lip (5).   The absorber seal according to claim 1 or 2, wherein the canvas used for the canvas layer (51) is bias knitting.   The absorber layer according to any one of claims 1 to 3, wherein the canvas layer (51) is formed by integrally baking the canvas at the time of vulcanization molding of the dust lip (5). sticker.

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