JP2008190650A - Sealing ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endless-type seal ring which can be fitted in a sealing groove with little force and with ease. <P>SOLUTION: By breaking an inner circumferential portion 3 formed from an elastic material into an inside portion of an outer circumferential portion 2 so as to thin the outer circumferential portion 2 formed from a resinous material, a cross-sectional area of the outer circumferential portion 2 with large deformation resistance to enlargement force of a diameter is reduced. Further, a cross-sectional area of the inner circumferential portion 3 formed from the elastic material which is flatly deformed and is easy to slip out is enlarged. As a result, the endless-type seal ring 1 can be fitted in the sealing groove with little force and with ease. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an endless type seal ring.

  The seal ring attached to the seal groove provided on the outer diameter surface of the inner member that seals the inside of the outer member has a seal surface with the inner periphery of the outer member formed on the outer peripheral surface, and one side surface A seal surface with a seal groove is formed, and there are an endless type of endless type and a cut type of which one place in the circumferential direction is cut. The cut type can be attached to the seal groove by expanding the diameter to push and expand the cut part, so there are metal and resin types, but the endless type cannot be expanded with metal. It is limited to those made of resin.

  Further, for example, the inner member to which the seal ring is attached slides with the inner peripheral portion of the cylindrical portion of the movable sheave of the belt type continuously variable transmission, and the hydraulic chamber for operating the movable sheave is arranged on the rear side of the movable sheave. In the case of a partition member formed by (for example, see Patent Document 1), the cut type seal ring is easily expanded by the hydraulic pressure of the hydraulic chamber, and the outer peripheral seal surface is a movable member. It is in close contact with the inner peripheral surface of the sheave tubular portion or the like. However, the endless type seal ring made of a hard resin material that can withstand sliding contact does not sufficiently expand its diameter depending on the hydraulic pressure, so its inner peripheral surface is brought into contact with the bottom of the seal groove, and the outer peripheral seal surface Must be in close contact with the inner peripheral surface of the outer member. For this reason, the endless type seal ring for such applications is thick in the radial direction, requiring a large amount of diameter expansion when installed in the seal groove, and is difficult to install in the seal groove. is there.

  An endless type seal ring used in a reciprocating gas machine has an outer peripheral portion formed of a resin material, an inner peripheral portion formed of an elastic material, and an inner peripheral portion formed of the elastic material formed on a seal groove. There is one that is in contact with the bottom to prevent gas leakage from the bottom of the seal groove (see, for example, Patent Document 2). In the one described in Patent Document 2, an outer peripheral portion formed of a resin material is divided into two in the axial direction, and a seal ring is expanded on the inner peripheral portion formed of an elastic material so as to be in close contact with an outer member. The expander is included.

JP 2004-270804 A Japanese Utility Model Publication No. 60-149466

  As described in Patent Document 2, the endless type seal ring in which the inner peripheral portion is formed of an elastic material is easier to install in the seal groove than that formed entirely of a resin material, but is formed of a resin material. There is still a problem that the deformation resistance against the expansion of the outer peripheral portion is still large, and a large force is required to get over the groove edge of the seal groove.

  Therefore, an object of the present invention is to provide an endless type seal ring that can be easily mounted in a seal groove with a small force.

  In order to solve the above problems, the present invention provides an outer peripheral surface formed of a resin material, an inner peripheral portion formed of an elastic material, and provided on an outer diameter surface of an inner member that seals the inside of the outer member. In an endless type seal ring that is mounted in a seal groove formed and the inner peripheral portion formed of the elastic material contacts the bottom of the seal groove, the inner peripheral portion formed of the elastic material is made of the resin material. A configuration in which the formed outer peripheral portion was bitten inside the outer peripheral portion was adopted so that the outer peripheral portion was thin.

  In other words, the inner peripheral portion formed of an elastic material is bitten inside the outer peripheral portion so that the outer peripheral portion formed of a resin material is thin. In addition, the cross-sectional area of the inner periphery made of an elastic material that deforms flat and easily escapes is increased, so that the endless type seal ring can be easily mounted in the seal groove with a small force.

  By providing a space portion that extends in the circumferential direction in the inner peripheral portion formed of the elastic material, the inner peripheral portion can be more easily escaped, and an endless type seal ring can be more easily mounted in the seal groove. .

  When the elastic material forming the inner peripheral portion is rubber, the inner peripheral portion formed of the rubber may be vulcanized and bonded to the outer peripheral portion formed of the resin material.

  Each of the seal rings described above is a partition member in which the inner member to which the seal ring is attached forms a hydraulic chamber for operating the movable sheave of the belt-type continuously variable transmission on the back side of the movable sheave. The member is suitable for a member that is a cylindrical portion of a movable sheave that slides on the outer peripheral surface of the partition member.

  The seal ring of the present invention has a large deformation resistance with respect to expansion because the inner peripheral portion formed of an elastic material is bitten inside the outer peripheral portion so that the outer peripheral portion formed of a resin material is thin. Reduce the cross-sectional area of the outer peripheral part, increase the cross-sectional area of the inner peripheral part made of an elastic material that deforms flat and easily escapes, and easily attaches an endless type seal ring to the seal groove with a small force Can do.

  By providing a space portion that extends in the circumferential direction in the inner peripheral portion formed of the elastic material, the inner peripheral portion can be more easily escaped, and an endless type seal ring can be more easily mounted in the seal groove. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1A and 1B, this endless type seal ring 1 has polyether ether ketone (PEEK) whose overall cross-sectional shape is an oval shape and whose outer peripheral portion 2 is a resin material. The inner peripheral part 3 is made of fluoro rubber as an elastic material, and the inner peripheral part 3 is vulcanized and bonded to the outer peripheral part 2. Moreover, the inner peripheral part 3 bites into the inner side of the outer peripheral part 2, and the outer peripheral part 2 is formed thin, and the inner peripheral part 3 is provided with a space part 3a that extends in the circumferential direction and opens to the inner diameter side. ing.

  2A, 2B and 2C show a modification of the seal ring 1. FIG. The modified example of FIG. 2 (a) is such that the space part 3a continuous in the circumferential direction of the inner peripheral part 3 is an annular closed space, and the modified example of FIG. 2 (b) is the space part of the inner peripheral part 3. In the modified example of FIG. 2C in which 3a is eliminated, the entire cross-sectional shape is rectangular.

  FIG. 3 shows a belt type continuously variable transmission using the seal ring 1. This belt-type continuously variable transmission has a fixed sheave 12 integrally formed on the outer periphery of the rotating shaft 11 and a movable sheave 13 slidably mounted on the outer periphery of the rotating shaft 11, and is opposed to the fixed sheave. A V-shaped pulley groove 14 is formed between the movable sheave 13 and the movable sheave 13, and is formed between the annular partition wall member 15 attached to the rotary shaft 11 on the back side of the movable sheave 13 and the movable sheave 13. The movable sheave 13 is slid by the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber 16 and the width of the pulley groove 14 changes steplessly. The hydraulic oil is supplied to the hydraulic chamber 16 from the axial oil passage 11 a provided in the shaft core portion of the rotating shaft 11 through the radial oil passage 11 b. The seal ring 1 is attached to a seal groove 15a provided on the outer diameter surface of the partition wall member 15, and is in sliding contact with the inner peripheral surface of the cylindrical portion 13a extending from the front end of the movable sheave 13 to the back side.

  As shown in FIG. 4 in an enlarged manner, in the seal ring 1 mounted in the seal groove 15a, the seal surface of the outer peripheral surface of the outer peripheral portion 2 is in close contact with the inner peripheral surface of the tubular portion 13a as an outer member, The sealing surface on one side is in close contact with the side wall of the sealing groove 15a, and the inner diameter surface of the inner peripheral portion 3 is in contact with the bottom of the sealing groove 15a. The seal ring 1 has a small cross-sectional area of the outer peripheral portion 2 that has a large deformation resistance with respect to expansion, a large cross-sectional area of the inner peripheral portion 3 that is easily deformed flat and escapes, and the inner peripheral portion 3 forms a space portion 3a. Therefore, it is possible to easily attach to the seal groove 15a with a small force.

  In the embodiment described above, the outer peripheral portion of the seal ring is formed of PEEK, and the inner peripheral portion is formed of fluororubber. However, the outer peripheral portion may be a resin material having a low sliding resistance, such as polyamide (PA) or polyphenylene sulfide. It can also be formed of (PPS) or the like. Moreover, the inner peripheral part should just be elastically deformed, and can also be formed with other elastic materials, such as urethane rubber.

a is an external perspective view showing an embodiment of a seal ring, b is a cross-sectional view of a a, b, and c are cross-sectional views showing modifications of the seal ring of FIG. 1 is a longitudinal sectional view showing a belt type continuously variable transmission using the seal ring of FIG. Sectional drawing which expands and shows the seal ring mounting part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal ring 2 Outer peripheral part 3 Inner peripheral part 3a Space part 11 Rotating shaft 11a Axial direction oil path 11b Radial direction oil path 12 Fixed sheave 13 Movable sheave 13a Cylindrical part 14 Pulley groove 15 Partition member 15a Seal groove 16 Hydraulic chamber

Claims (4)

  The outer peripheral portion is formed of a resin material, the inner peripheral portion is formed of an elastic material, and is mounted on a seal groove provided on the outer diameter surface of the inner member that seals the inside of the outer member, and is formed of the elastic material. In the endless type seal ring in which the inner peripheral portion is in contact with the bottom of the seal groove, the outer peripheral portion is formed so that the inner peripheral portion formed of the elastic material is thinner than the outer peripheral portion formed of the resin material. A seal ring characterized by being bitten inside the part.   The seal ring of Claim 1 which provided the space part which continues in the circumferential direction in the inner peripheral part formed of the said elastic material.   The seal ring according to claim 1 or 2, wherein an elastic material forming the inner peripheral portion is rubber, and an inner peripheral portion formed of the rubber is vulcanized and bonded to an outer peripheral portion formed of the resin material.   The inner member to which the seal ring is attached is a partition member that forms a hydraulic chamber for operating the movable sheave of the belt type continuously variable transmission on the back side of the movable sheave, and the outer member is a member of the partition member. The seal ring according to any one of claims 1 to 3, wherein the seal ring is a cylindrical portion of a movable sheave that slides on the outer peripheral surface.

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