JP5537042B2 - Endless type seal ring and belt type continuously variable transmission - Google Patents

Description

  The present invention relates to an endless type seal ring and a belt type continuously variable transmission.

  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. A seal surface with a seal groove is formed on a side surface, 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 tube or the like. However, since it has a cut part, it has a problem that sealing performance is inferior to an endless type seal ring. On the other hand, the endless type seal ring made of a hard resin material that resists sliding contact does not sufficiently expand its diameter depending on the hydraulic pressure, so its inner peripheral surface is in 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.

  In particular, a hydraulic seal ring for moving a movable sheave of a belt-type continuously variable transmission has a diameter of 100 mm or more, and it is very difficult to expand the diameter and attach it to a seal groove.

  An endless type seal ring used in a reciprocating gas machine has an outer peripheral side formed of a resin material, an inner peripheral side formed of an elastic material, and an inner peripheral side formed of the elastic material is formed of 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, the outer peripheral side formed of a resin material is divided into two in the axial direction, and the seal ring is expanded on the inner peripheral side formed of an elastic material so as to be in close contact with the outer member. The expander is included.

  As a seal ring that solves the problems of conventional endless type seal rings, an outer peripheral portion is formed of a resin material, an inner peripheral portion is formed of an elastic material, and an inner peripheral portion formed of the elastic material is used as the resin. There is known a seal ring characterized in that the outer peripheral portion made of a material is bitten inside the outer peripheral portion so as to be thin (see Patent Document 3).

JP 2004-270804 A Japanese Utility Model Publication No. 60-149466 JP 2008-190650 A

  As described in Patent Document 2, the endless type seal ring in which the inner peripheral side 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 with respect to the diameter expansion on the outer peripheral side is still large, and a large force is required to get over the groove edge of the seal groove.

  The seal ring described in Patent Document 3 is formed of a resin material such as polyether ether ketone (hereinafter referred to as PEEK) resin or polyphenylene sulfide (hereinafter referred to as PPS) resin, even if the outer peripheral portion is thin. The outer peripheral portion is difficult to be deformed when the diameter is expanded, and if the outer peripheral portion is assembled with the direction of the outer peripheral portion facing the side surface or the inner peripheral side by mistake, it is difficult to restore it correctly.

  The present invention has been made to cope with such a problem, and an object thereof is to provide an endless type seal ring that can be easily mounted in a seal groove with a small force, and a continuously variable transmission using the seal ring. And

  The seal ring of the present invention is an endless type seal ring in which the outer peripheral member is formed of a resin material, the inner peripheral member is formed of an elastic material, and the outer peripheral member and the inner peripheral member are integrally formed. It has one or more cutting parts. The seal ring is mounted in a seal groove provided on the outer diameter surface of the inner member that seals the inside of the outer member, and the inner peripheral member formed of the elastic material contacts the bottom of the seal groove. It is characterized by doing.

  The main material of the resin material is a fluororesin. The fluororesin is a polytetrafluoroethylene (hereinafter referred to as PTFE) resin. The elastic material is a synthetic rubber or an elastomer. The elastomer is a thermoplastic elastomer.

  The seal ring is characterized in that the resin material of the outer peripheral member is integrally formed at the same time as the elastic material of the inner peripheral member is molded. Further, the seal ring is formed integrally with the resin material of the outer peripheral member at the same time as the elastic material of the inner peripheral member is vulcanized. Further, the seal ring is formed integrally with the resin material of the outer peripheral member at the same time as the injection molding of the elastic material of the inner peripheral member.

  The cutting part of the said outer peripheral member is one place, It is characterized by the above-mentioned. The seal ring is a seal ring having a diameter of 100 mm or more.

  The seal ring is a seal ring for a hydraulic device.

  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. It is a cylindrical part of a movable sheave that slides on the outer peripheral surface.

  The inner member to which the seal ring is attached is a movable sheave of a belt-type continuously variable transmission, and the outer member is a partition member that forms a hydraulic chamber for operating the movable sheave on the back side of the movable sheave. It is a cylindrical part, It is characterized by the above-mentioned.

  The belt-type continuously variable transmission of the present invention is a belt-type continuously variable transmission in which a movable sheave is fitted on the outer periphery of a shaft so as to be movable in the axial direction, and seals a hydraulic chamber for operating the movable sheave. The seal ring is the above-described seal ring of the present invention.

  The seal ring of the present invention (Claim 1) is an endless type seal ring in which the outer peripheral member is made of a resin material, the inner peripheral member is made of an elastic material, and the outer peripheral member and the inner peripheral member are integrally formed. Since the member has one or more cut portions in the axial direction, the outer peripheral member can follow the elastic deformation of the inner peripheral member by the cut portion when expanding the diameter, and an endless type seal ring can be easily attached to the seal groove with a small force it can. Moreover, since the inner peripheral member made of an elastic material is reduced in diameter when installed in the seal groove and the cut portion of the outer peripheral member is also closed, the sealing performance is excellent.

  The seal ring according to claim 2 is attached to a seal groove provided on an outer diameter surface of the inner member that seals the inside of the outer member, and an inner peripheral member formed of the elastic material is provided on the seal groove. Excellent contact with the bottom.

  Since the main material of the resin material is a fluororesin, the seal ring according to claims 3 and 4 is excellent in low friction characteristics and has a characteristic of following elastic deformation of an elastic body in tensile elastic characteristics. Excellent fit to the groove. In particular, since the fluororesin is PTFE resin, it has excellent oil resistance with hydraulic fluid.

  In the seal ring according to claims 5 and 6, since the elastic material is a synthetic rubber or an elastomer, the diameter can be easily expanded when the seal ring is mounted.

  In the seal ring according to the seventh to ninth aspects, since the resin material of the outer peripheral member is integrally formed simultaneously with the molding of the elastic material of the inner peripheral member, the outer peripheral member and the inner peripheral member can be easily integrated. Moreover, since it forms integrally at the time of vulcanization molding of the elastic material of an inner peripheral member, the adhesive strength of an outer peripheral member and an inner peripheral member can be made high, and it does not isolate | separate at the time of diameter expansion. In addition, since the resin material of the outer peripheral member is integrally formed at the same time as the injection molding of the elastic material of the inner peripheral member, the manufacturing cost can be reduced.

  The seal ring according to the tenth aspect can be easily made into a composite because the outer peripheral member has one cut portion.

  The seal ring according to claim 11 is excellent in mountability even with a seal ring having a diameter of 100 mm or more, which is difficult to mount in the seal groove.

  Since the seal ring according to claims 12 to 14 is excellent in seal characteristics, it is suitable for a seal ring for a hydraulic device. In particular, 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 the partition wall. Since it is a cylindrical portion of a movable sheave that slides on the outer peripheral surface of the member, the sealing performance of the hydraulic fluid is excellent. In particular, the inner member to which the seal ring is attached is a movable sheave of a belt-type continuously variable transmission, and the outer member forms a hydraulic chamber for operating the movable sheave on the back side of the movable sheave. Also in the case of the cylindrical part of the partition member, the sealing performance of the hydraulic fluid is excellent.

  A continuously variable transmission according to the present invention (Claim 15) is a belt-type continuously variable transmission in which a movable sheave is fitted to the outer periphery of a shaft so as to be movable in the axial direction, and is a hydraulic chamber for operating the movable sheave. Since the above-described seal ring is used to seal the seal ring, the seal ring is easily mounted and the hydraulic fluid is excellent in sealability.

(A) is an overall perspective view of the seal ring of the present invention, and (b) is a cross-sectional view taken along plane A in FIG. 1 (a). It is sectional drawing which shows the belt type continuously variable transmission of this invention. It is an expanded sectional view of the B section of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A is an overall perspective view of the seal ring, and FIG. 1B is a cross-sectional view taken along a plane A in FIG. Surface A is a surface that cuts the seal ring perpendicular to the radial direction. As shown in FIGS. 1A and 1B, in the endless type seal ring 1, the entire cross-sectional shape excluding the cut portion 2a is rectangular on the radially outer side, and the inner side in the radial direction shortens the bottom 3a. An isosceles trapezoid with a side and a hypotenuse 3b. The outer peripheral member 2 that is the rectangular portion and the inner peripheral member 3 that is the isosceles trapezoidal portion are integrally formed. The outer peripheral member 2 has one or more cutting portions 2a in the axial direction. The outer peripheral member 2 is formed of a resin material, and the inner peripheral member 3 is formed of a synthetic rubber or elastomer that is an elastic material.

  In the seal ring according to the present invention, the cutting portion provided in the axial direction on the outer peripheral member includes the diameter expansion performance of the seal ring when climbing over the side wall of the seal groove when the seal ring is mounted, and the bottom of the seal ring as the bottom of the seal groove. What is necessary is just to be able to give the mounting property which makes the diameter-reduction performance of the resin material contacted to both compatible. For example, in the case of PTFE resin, it is preferable that the cutting width is 0 to 1.0 mm, preferably 0 to 0.5 mm.

  FIG. 2 shows a belt type continuously variable transmission according to the present invention. As shown in FIG. 2, the 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. A V-shaped pulley groove 14 is formed between the fixed sheave 12 and the movable sheave 13 that face each other. The movable sheave 13 is slid by the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber 16 formed between the annular partition wall member 15 attached to the rotary shaft 11 and the movable sheave 13 on the back side of the movable sheave 13. The width of the 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 of the present invention is attached to a seal groove 15a provided on the outer diameter surface of the partition wall member 15, and comes into 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. ing. Alternatively, although not shown, it is mounted in a seal groove provided on the outer diameter surface of the movable sheave so as to be in sliding contact with the inner peripheral surface of the cylindrical portion provided on the outer peripheral portion of the partition wall member.

  FIG. 3 is an enlarged cross-sectional view of a portion B in FIG. As shown in FIG. 3, in the seal ring 1 mounted in the seal groove 15a, the seal surface of the outer peripheral surface of the outer peripheral member 2 is in close contact with the inner peripheral surface of the cylindrical portion 13a as an outer member, and one side surface. The seal surface is in close contact with the side wall of the seal groove 15a, and the bottom side 3a, which is the inner diameter surface of the inner peripheral member 3, is in contact with the bottom of the seal groove 15a. Since the seal ring 1 has one or more cut portions on the outer peripheral member 2 having a large deformation resistance with respect to the diameter expansion, the cut portion 2a (see FIG. 1) remains the inner peripheral member even when the diameter of the seal ring is increased. Therefore, even a seal ring having a diameter of 100 mm or more can be easily mounted in the seal groove 15a with a small force.

  The seal ring of the present invention comprises an outer peripheral member made of a resin material and an inner peripheral member made of an elastic material, and the outer peripheral member and the inner peripheral member are integrally formed, and the outer peripheral member has one or more cutting portions in the axial direction. It is essential to provide The inner peripheral member is an elastic material for the diameter expansion performance of the seal ring when overcoming the seal groove and the diameter reduction performance when contacting the bottom of the seal groove, which are required when the seal ring is mounted in the seal groove. Therefore, the outer peripheral member is formed integrally with the inner peripheral member and is provided with one or more cutting portions in the axial direction. It is possible to follow the elastic deformation of the inner peripheral member at the time of diameter reduction. For this reason, the endless type seal ring can be easily mounted in the seal groove with a small force.

  The seal ring of the present invention is attached to a seal groove provided on the outer diameter surface of the inner member that seals the inside of the outer member in the hydraulic drive device, and the inner peripheral member formed of the elastic material is the seal groove. It is preferable to contact the bottom. By contacting the inner circumferential member made of an elastic material with the bottom of the seal groove, the sealing surface of the seal ring can be brought into close contact with the inside of the outer member by utilizing the elastic force of the elastic material. Can be improved.

  As the resin material used in the present invention, a known PEEK resin, PPS resin, fluororesin or the like can be used as a sealing material. Among these, it is preferable to use a fluororesin having a large elastic deformation rate in order to expand the diameter when mounted in the seal groove 15a (see FIGS. 2 and 3).

  The fluororesin that can be used in the present invention is not particularly limited as long as it contains fluorine in the molecule. PTFE resin, tetrafluoroethylene-hexafluoropropylene copolymer resin, tetrafluoroethylene-perfluoroalkyl vinyl ether Examples thereof include copolymer resins and ethylene-tetrafluoroethylene copolymer resins. Among these, it is preferable to use a PTFE resin excellent in oil resistance with a hydraulic fluid.

  In the seal ring of the present invention, the elastic material constituting the inner peripheral member of the seal ring is preferably made of synthetic rubber or elastomer. By forming it with synthetic rubber or elastomer, it is excellent in the diameter expansion performance of the seal ring when climbing over the side wall of the seal groove and the diameter reduction performance when the bottom of the seal ring is attached to the bottom of the seal groove. The synthetic rubber or elastomer is more preferably a synthetic rubber or elastomer excellent in oil resistance of the hydraulic fluid, and oil resistant rubbers such as hydrogenated nitrile rubber, fluorine rubber, and acrylic rubber are preferable. Acrylic rubber is particularly preferred because it has excellent oil resistance and rubber elasticity. The rubber hardness (JIS K6301) of these synthetic rubbers or elastomers is preferably Hs 70 to 90. If it is softer than Hs70, it may be deformed by being defeated by the hydraulic pressure, and if it is harder than Hs90, it is difficult to incorporate it into the seal groove.

  In the seal ring of the present invention, the elastomer is preferably a thermoplastic elastomer. By using a thermoplastic elastomer, molding by injection molding, extrusion molding or the like becomes possible, and mass production can be performed at low cost, so that production efficiency is improved.

  In the seal ring of the present invention, it is preferable that the resin material of the outer peripheral member is integrally formed at the same time when the elastic material of the inner peripheral member is molded. By forming them integrally, it is excellent in assemblability into the seal groove, and the axial displacement between the two members can be prevented, and an integrated operation such as bonding the two manufactured separately is not required. As for the integral formation, for example, the inner peripheral member can be formed by inserting an outer peripheral member obtained by injection molding in advance into a molding die for the inner peripheral member. It is preferable that the elastic material of the inner peripheral member is (1) formed integrally with the outer peripheral member at the time of vulcanization molding, or (2) formed integrally with the outer peripheral member at the same time by injection molding. (1) By integrally forming with the outer peripheral member at the same time during vulcanization molding, the resin material of the outer peripheral member and the elastic material of the inner peripheral member are firmly bonded by vulcanization, and the diameter and diameter when the seal ring is mounted are reduced. The accompanying separation of the outer peripheral member and the inner peripheral member can be prevented. Further, (2) the manufacturing cost can be reduced by forming the outer peripheral member integrally with injection molding at the same time.

  In the seal ring of the present invention, it is preferable that the cut portion of the outer peripheral member is provided at one place. Since the outer peripheral member can be moved to an arbitrary position while being integrated, the outer peripheral member can be easily set in the molding die for the inner peripheral member. It is possible to easily obtain a composite by integral molding. Further, the sealing performance is superior to that having a plurality of cut portions.

  The seal ring of the present invention can have a diameter of 100 mm or more. In the case of a seal ring with a large diameter such as a seal ring diameter of 100 mm or more, the side wall of the seal groove is often high. It is easy to limit the diameter-reducing performance at the time of making it difficult to attach the seal ring to the seal groove. Even if the seal ring of the present invention has a diameter of 100 mm or more, the above-described outer peripheral member is made of a resin material, the inner peripheral member is formed of an elastic material, and the outer peripheral member and the inner peripheral member are integrally formed. Since it is a ring, it has excellent diameter expansion performance and diameter reduction performance, and even when such a large-diameter seal ring is used, it can be easily mounted in the seal groove.

  The seal ring of the present invention 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. It is preferable that the member is a cylindrical portion of a movable sheave that slides on the outer peripheral surface of the partition member. The inner member to which the seal ring is attached is a movable sheave of a belt type continuously variable transmission, and the outer member forms a hydraulic chamber for operating the movable sheave on the back side of the movable sheave. It is preferable that it is a cylindrical part. The inner member is a partition member or a movable sheave, and the outer member is a tubular portion of the movable sheave or a tubular portion of the partition member, so that the entire sliding surface of the seal ring slides with the mating member. Therefore, the sealing performance of hydraulic fluid is improved.

  A continuously variable transmission according to the present invention is a belt-type continuously variable transmission in which a movable sheave is fitted to the outer periphery of a shaft so as to be movable in the axial direction, and an outer peripheral member is made of a resin material and an inner peripheral member is made of an elastic material. And the outer peripheral member and the inner peripheral member are integrally formed, and the above-described seal ring of the present invention in which the outer peripheral member is provided with one or more cut portions in the axial direction is used. By using the seal ring of the present invention, it is excellent in the mountability of the seal ring and in the sealability of the hydraulic fluid in the hydraulic chamber.

  The seal ring of the present invention comprises an outer peripheral member made of a resin material and an inner peripheral member made of an elastic material, and the outer peripheral member and the inner peripheral member are integrally formed, and the outer peripheral member has one or more cutting portions in the axial direction. Therefore, the present invention can be suitably used for an endless type seal ring that can be easily mounted in a seal groove with a small force and a continuously variable transmission using the seal ring.

DESCRIPTION OF SYMBOLS 1 Seal ring 2 Outer peripheral member 3 Inner peripheral member 3a Bottom 11 Rotating shaft 11a Axial 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 (5)

A fixed sheave integrally formed on the outer periphery of the rotating shaft; and a movable sheave slidably mounted on the outer periphery of the rotating shaft, and is V-shaped between the opposed fixed sheave and the movable sheave. A pulley groove is formed, and the movable sheave is slid by the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber formed between the annular partition member attached to the rotary shaft on the back side of the movable sheave and the movable sheave. A belt type continuously variable transmission in which the width of the pulley groove changes steplessly,
Wherein mounted in the seal groove provided on the outer diameter surface of the partition member, the inner peripheral surface and the sliding contact with the seal ring reciprocating tubular portion extending toward the back side from the front end of the movable sheave, or of the movable sheave is attached to the seal groove provided on the outer diameter surface, and an inner peripheral surface in sliding contact with the cylindrical portion provided on an outer peripheral portion of the partition member a seal ring reciprocates,
The seal ring has a substantially trapezoidal shape with a diameter of 100 mm or more and a cross-sectional shape with a shorter inner diameter side,
The outer peripheral member is a resin material, the inner peripheral member is formed of an elastic material, and the outer peripheral member and the inner peripheral member are formed as an endless type seal ring,
An inner peripheral member formed of the elastic material contacts a bottom of the seal groove;
The main material of the resin material is polytetrafluoroethylene resin,
The elastic material is a thermoplastic elastomer having a rubber hardness (JIS K6301) in the range of Hs 70 to 90,
A seal ring for a belt-type continuously variable transmission, wherein the outer circumferential member has one cut portion having a width of 0 to 1.0 mm in the axial direction. 2. The seal ring of a belt type continuously variable transmission according to claim 1, wherein the seal ring is integrally formed with the resin material of the outer peripheral member at the same time as the elastic material of the inner peripheral member is molded. The belt-type continuously variable transmission according to claim 1 or 2 , wherein the seal ring is formed integrally with the resin material of the outer peripheral member at the same time as the elastic material of the inner peripheral member is vulcanized . Seal ring. It said seal ring, Mu belt according to one of claims 1 to 3, characterized in that the resin material of said outer peripheral member is formed integrally at the same time during the injection molding of the resilient material of the inner peripheral member A seal ring for a step transmission .   The substantially trapezoidal shape in which the cross-sectional shape of the seal ring is shorter on the inner diameter side is a shape composed of a rectangular portion of the outer peripheral member and an isosceles trapezoidal portion of the inner peripheral member. The seal ring of the belt type continuously variable transmission according to any one of claims 4 to 5.

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