JP2006183735A - Guide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide capable of preventing permanent set of rubber of a fixed seal portion covering a metallic ring kept into contact with an end face of a base portion of the guide to prevent impairing of caulking force when the metallic ring is caulked and fixed by a flange portion of a fixing member, in the guide for fixing a seal device used in a shock absorber or the like. <P>SOLUTION: In this guide 5 for buffering, connected with a cylindrical portion 4a of the fixing member 4, having the base portion 51 formed integrally with a seal member 3, and kept into contact with the fixed seal portion 36 covering an inner end face 2c of the metallic ring 2, and axially holding and fixing the metallic ring 2 by the base portion 51 and the flange portion 4b formed by bending a terminal end of the cylindrical portion 4a for caulking and fixing, and kept into pressure-contact with an outer end face 2d of the metallic ring 2, a projection 55 is formed on an end face 54 of the base portion 51. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing structure for fixing, for example, a sealing device used for a shock absorber.

  Conventionally, with respect to fixing of a sealing device including a metal ring and a seal member used for a shock absorber, for example, the structure shown in FIG. 6 is used. That is, the fixed seal portion 108 integrally formed with the seal member 107 covering one end surface 102 a of the metal ring 102, and the end surface 106 a of the pedestal portion 106 of the guide 105 coupled to the cylindrical portion 104 a of the fixed member 104. To seal and fix the metal ring 102 in the axial direction by bending the end of the cylindrical part 104a and fixing the other face 102b of the metal ring 102 to press the other part 102b. 101 was fixed.

  However, since the end surface 106a of the pedestal portion 106 of the guide 105 is a flat surface, the end surface of the pedestal portion 106 is fixed when the end portion of the cylindrical portion 104a of the fixing member 104 is bent and the other surface of the metal ring 102 is pressed and fixed. The rubber of the fixed seal portion 108, which is a rubber-like elastic body covering one surface of the metal ring that is in contact with 106a, sags and the caulking force decreases. As a result, there is a problem in that the axial fixation of the metal ring 102 becomes unstable and the sealing performance of the sealing device 101 is lowered.

  Further, in the following patent document, the corner of the metal ring is dropped, and the flange portion of the fixing member is bent along the portion where the corner is dropped to disperse the stress, and the magnitude of the load in the axial direction is reduced. It has been proposed to stabilize and improve the sealing performance, but regarding the countermeasure that the axial fixation becomes unstable due to the rubber falling on the contact surface between the metal ring and the guide of the present invention. Nothing was disclosed.

Utility Model Registration No. 2555598

  In view of the above points, in the guide for fixing a sealing device used for a shock absorber or the like, the present invention makes contact with the end surface of the pedestal portion of the guide when the metal ring is caulked and fixed by the flange portion of the fixing member. It is an object of the present invention to provide a guide that can prevent the rubber of the fixed seal portion covering the metal ring from sagging, thereby preventing a reduction in caulking force and maintaining the sealing performance of the sealing device.

  In order to achieve the above object, a guide according to claim 1 of the present invention has an annular gap formed by a fixed member and a movable member that is concentrically inserted into a shaft hole provided in the fixed member. A sealing device for sealing is fixed, and the sealing device includes a metal ring and a sealing member that slides in close contact with the movable member, is coupled to a cylindrical portion of the fixing member, and is integrally formed with the sealing member. A flange portion having a pedestal portion that is in contact with a fixed seal portion covering one surface of the metal ring, bending the cylindrical portion terminal for crimping and fixing, and pressing the other surface of the metal ring; In the guide for sandwiching and fixing the metal ring in the axial direction, a protrusion is formed on the end face of the pedestal portion.

  The present invention has the following effects.

  In other words, the guide according to the present invention having the above-described configuration has a protrusion formed on the end surface of the pedestal portion of the guide that contacts the fixed seal portion that is integrally formed with the seal portion and covers one surface of the metal ring. Even if the metal ring is clamped and fixed in the axial direction by the flange portion crimped by the cylindrical portion of the member, the rubber of the fixed seal portion which is a rubber-like elastic body does not sag. Accordingly, it is possible to prevent the caulking force from being lowered and maintain the sealing performance of the sealing device over a long period of time.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

  FIG. 1 shows a state in which a sealing device is mounted on a shock absorber. That is, the cross-section in a state where the sealing device is mounted on the housing including the guide according to the embodiment of the present invention is shown, and is configured as follows.

  The sealing device 1 includes a disk-shaped metal ring 2 and a seal member 3 made of a rubber-like elastic body that is vulcanized and bonded to the metal ring 2. The sealing device 1 is concentrically mounted in an annular space formed by a housing 4 that is a fixed member and a shaft 6 that is a movable member.

  The housing 4 includes a cylindrical portion 4a, a flange portion 4b bent to the inner peripheral side in order to fix the axially outer end of the cylindrical portion 4a, and a guide 5 coupled to the inner peripheral surface of the cylindrical portion 4a. Consists of. A shaft hole 7 penetrating in the axial direction is formed in the inner periphery of the guide 5, and the shaft 6 is inserted into the shaft hole 7 concentrically with the housing 4.

  A pedestal 51 that protrudes outward in the axial direction is provided at the outer peripheral end of the guide 5. The outer peripheral side surface of the pedestal portion is a tapered surface 52 that is gradually tapered toward the outer side in the axial direction. The tapered surface 52, the inner peripheral surface of the cylindrical portion 4a, and the axial direction of the metal ring 2 described later. A space 53 having a triangular cross section is formed with the inner end face 2c. An end surface 54 of the pedestal 51 is in contact with a fixed seal portion 36 to be described later, and a projection 55 is formed on the end surface 54.

  The metal ring 2 is concentrically disposed between the housing 4 and the shaft 6, the outer peripheral portion 2a is fitted to the inner peripheral surface of the fixing member 4a, and a seal portion 31 described later is vulcanized and bonded to the inner peripheral portion 2b. The axially inner end surface 2c abuts on the pedestal 51 via a fixed seal portion 36 formed integrally with the seal portion 31, and the axially outer end surface 2d has the cylindrical portion 4a on the inner peripheral side for caulking and fixing. It is press-contacted to the bent flange part 4b.

  The seal member 3 is formed of a rubber-like elastic body and extends from the seal portion 31 that slides on the peripheral surface of the shaft 6, a fixed seal portion 36 that is formed integrally with the seal portion 31, and the fixed seal portion 36. And an outer peripheral seal portion 37 located on the outer peripheral side.

  The seal part 31 extends to the outside in the axial direction and mainly seals the dust seal lip 32 that seals ingress of external foreign matter, and the main seal lip that extends to the inside in the axial direction and seals mainly the sealing fluid flowing out. 33 and a sub seal lip 34 positioned on the inner side in the axial direction are integrally formed, and a garter spring 35 for applying a pressing force in the axial direction is mounted on the outer peripheral side of the main seal lip 33.

  The fixed seal portion 36 extends from the seal portion 31 to the outer peripheral side, and covers the axially inner end face 2c of the metal ring 2 in a thin shape.

  The outer peripheral seal portion 37 is integrally formed with the fixed seal portion 36 so as to cover the inner end surface 2c of the metal ring 2 and is press-fitted into a space 53 formed on the outer peripheral side of the pedestal portion 51 to ensure sealing performance with the cylindrical portion 4a. is doing.

  In the above configuration, the sealing device 1 is mounted by inserting the fixed seal portion 36 covering the inner end surface 2 c of the metal ring 2 toward the inner side in the axial direction, and inserting the fixed seal portion 36 into the end surface of the pedestal portion 51 of the guide 5. 54. Thereafter, the outer end face 2d of the metal ring 2 is pressed into contact with the flange portion 4b obtained by bending the end of the cylindrical portion 4a to fix the crimp, and the metal ring 2 is clamped and fixed with the pedestal portion 51 in the axial direction.

  In this case, since the protrusion 55 formed on the end surface 54 of the pedestal 51 that contacts the fixed seal portion 36 is difficult to be fixed to the fixed seal portion 36, the fixed seal portion 51 is not crushed. It is possible to prevent the rubber of the fixed seal portion of the elastic member from sagging. Further, since the protrusion 55 breaks the rubber which is difficult to fix the fixed seal portion 36, the protrusion 55 and the metal ring 2 covered with the fixed seal portion 36 are in metal contact, so that the fixing force can be further stabilized. It becomes.

  The protrusions 55 formed on the end face 54 of the pedestal 51 may be formed in the circumferential direction as shown in FIGS. 2 and 3, or may be formed in the radial direction as shown in FIGS. Also good.

  Moreover, when forming in the circumferential direction, you may form in concentric form and may be continuous spirally.

  Furthermore, a satin finish may be formed on the end face 54 as a substitute for the protrusion 55 formed on the end face 54.

Sectional drawing which shows the mounting state of the sealing device attached to the housing containing the guide which concerns on this invention Cross-sectional view of the main part of the guide in FIG. Plan view of the guide in FIG. Sectional drawing of the principal part of the guide in another Example 4 is a plan view of the guide in FIG. Sectional drawing which shows the mounting state of the sealing device attached to the housing containing the guide which concerns on a prior art example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Metal ring 2a Outer peripheral part 2b Inner peripheral part 2c, 2d End face 3 Seal member 31 Seal part 32, 33, 34 Seal lip 35 Garter spring 36 Fixed seal part 4 Housing (fixing member)
4a Cylindrical part 4b Flange part 5 Guide 51 Base part 52 Tapered surface 53 Space 54 End face 55 Projection 6 Axis (movable member)
7 shaft hole

Claims (1)

Fixing a sealing device that seals an annular gap formed by a fixing member and a movable member that is concentrically inserted into a shaft hole provided in the fixing member;
The sealing device includes a metal ring and a seal member that slides closely on the movable member,
The cylindrical portion is fixed to the cylindrical portion of the fixing member and has a pedestal portion that is in contact with a fixed sealing portion that is integrally formed with the sealing member and covers one surface of the metal ring. In a guide that bends and fixes the metal ring in the axial direction with a flange part that bends the terminal and presses the other surface of the metal ring,
A guide having a protrusion formed on an end surface of the pedestal.

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