JP2002181192A - Torsion ring gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsion ring gasket capable of ensuring the large deformation by utilizing the compressive elasticity, and being mounted in a small space. SOLUTION: This torsion ring gasket 1 is formed by integrally forming a projection 11 extended over a thickness of a ring 10 around the ring 10. The projection 11 is integrally formed on an inner periphery upper part of the ring 10 or integrally formed on the inner periphery upper part and an outer periphery lower part of the ring 10. Preferably, the ring 10 has an annular cross section, and the projection 11 has a triangular cross section. Or the ring 10b has a square cross section and the projection 11b has an L-shaped cross section. The ring 10 is made of a metallic material or a resin material. A surface of the gasket 1 is optionally coated with rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion ring gasket used for a cylinder head of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a gasket has been used for a cylinder head gasket of an internal combustion engine, a combustion gas seal portion of a bore portion, a seal portion of each portion for cooling water and lubricating oil, a seal portion of each intake and exhaust gas, and other piping and flanges. It is used for sealing parts of joints.

Conventional typical gaskets include a sheet gasket, a metal gasket, and a rubber ring gasket. The sheet-shaped gasket utilizes the compression elasticity of a graphite sheet, a rubber sheet, or the like. The metal gasket forms a bead on a metal plate and utilizes the compression elasticity of the bead. The rubber ring gasket is a rubber molded product and utilizes the compression elasticity of rubber.

[0004]

Since the sheet-like gasket utilizes the compression / restoration characteristics of the sheet, both the amount of compression and the amount of restoration are small, and the sheet-like gasket has sufficient deformation followability with a low-rigidity flange of an automobile engine or the like. I can't secure it.

The shape of a metal gasket is restricted because bead forming is basically drawing. In addition, since the elasticity of bending deformation is used, it is not possible to secure very large resilience with a single plate due to fatigue strength restrictions.
Followability is ensured by multi-layering. This results in high costs.

The rubber ring / gasket can secure large deformation followability by the elasticity of the rubber, but cannot be used in a place where the temperature becomes high due to the characteristic of the rubber because it is a rubber molded product.

Therefore, the present invention utilizes compression elasticity to
It is an object of the present invention to obtain a torsion ring gasket which can secure a larger deformation amount and can be installed in a small space.

[0008]

The torsion ring gasket of the present invention basically has a structure in which a ridge extending beyond the thickness of the ring is provided integrally around the ring. The ridge is provided integrally above the inner circumference of the ring, or integrally above the inner circumference and below the outer circumference of the ring. Here, “up and down” means a relative meaning, and when the gasket is turned over, the upside down is reversed.

Preferably, the ring has a circular cross section and the ridge has a triangular cross section. Further, the ring may have a square cross section, and the ridge may have an L-shaped cross section.

[0010] The ring is made of a metal material or a resin material. A rubber coating may be applied to the surface of the gasket. This further improves the adhesion of the mating component to the sealing surface.

[0011] The torsion ring gasket of the present invention may be provided inside the opening of the supporting gasket. In this case, it is preferable to perform caulking on the upper and lower surfaces of the opening of the supporting gasket. Further, the torsion ring / gasket of the present invention may be installed so as to fit into a groove provided on one sealing surface of a pair of mating parts.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a torsion ring gasket according to the present invention will be described with reference to FIGS.

The torsion ring gasket 1 of the present invention
Basically, as shown in FIGS. 1 and 2 and FIG. 6A, a ridge 11 extending around the thickness of the ring 10 and extending beyond the thickness of the ring is provided integrally. . The ridge 11 is provided integrally above the inner periphery of the ring 10 (FIG. 1) or integrally above the inner periphery and below the outer periphery of the ring 10 (FIG. 6A).

The provision of the ridge 11 on the inner periphery of the ring 10 is a basic configuration. If the ridges 11 are provided on the outer periphery of the ring 10, when the gasket 1 is tightened, the stress in the circumferential direction becomes a tensile stress, so that there is a possibility that fatigue fracture may occur due to load fluctuations or the like during actual operation. On the other hand, if it is provided on the inner circumference, the stress in the circumferential direction becomes a compressive stress,
Hard to break. However, as shown in FIG. 6A, when the ridges 11 are provided on the inner and outer circumferences of the ring 10,
Circumferential compressive and tensile stresses occur simultaneously and cancel each other out, reducing the possibility of fracture.

As shown in FIGS. 1 and 6A, it is preferable that the ring 10 has a circular cross section and the ridge 11 has a triangular cross section. Also, as shown in FIG. 6B, the ring 10b has a square cross section and the ridge 1
1b may have an L-shaped cross section.

The rings 10, 10b are made of a metal material or a resin material. The surface of the gasket 1 may be provided with a rubber coating (not shown).

The torsion ring gasket 1 of the present invention
May be provided inside the opening 21 of the supporting gasket 2 as shown in FIG. In this case, FIG.
(B), the opening 2 of the supporting gasket 2
It is preferable to carry out a crimping process 22 on the upper and lower surfaces of 1. Further, as shown in FIG. 5, the torsion ring gasket 1 of the present invention may be installed so as to fit into a groove 32a provided on one of the sealing surfaces 31a of the mating parts 3a, 3b. The groove 32a may be open to the inside of the opening (A) or may be blocked from the opening (B).

The operation of the torsion ring gasket 1 of the present invention shown in FIGS. 1 and 2 will be described with reference to FIG. As shown in FIG. 3A, the gasket 1 has a sealing surface 31 of a pair of mating parts 3a and 3b.
It is installed between a and 31b. In this case, the gasket 1 acts as if it were an O-ring. However, since the gasket 1 has the ridge 11, the gasket 1 functions better than a normal O-ring. That is, as shown in FIG. 3A, when the pair of mating parts 3a and 3b are tightened by the load P, a bending moment is generated in the ring 10 by leverage of the ridge 11. As a result, as shown in FIG. 3B, the ring 10 is twisted inward (clockwise in the illustrated example). Due to the torsional reaction force of the ring 10, the contact surface between the ring 10 and the ridge 11 secures the sealing surface pressure.
By changing the length, cross-sectional shape and installation position of the ridge 11, and the diameter and cross-sectional shape of the ring 10, the deformation amount and the surface pressure (reaction force) can be adjusted.

[0019]

According to the present invention, the following effects can be obtained. (1) Since the torsional rigidity of a metal or resin material can be utilized, a large compression elastic deformation can be obtained. (2) High sealing surface pressure can be maintained with a small amount of material. (3) In the case of resin molding, the shape and the like of the ring and the ridge can be freely set, and the sealing characteristics according to the installation location can be secured. (4) Even if there is a partial defect in the sealing surface of the mating component, high sealing characteristics can be maintained by the effect of (3). (5) Recycling is possible by using a thermoplastic resin. (6) Since an O-ring body can be used, the installation space can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a torsion ring gasket according to the present invention.

FIG. 2 is a plan view seen in the direction of arrow II in FIG.

FIG. 3 is an explanatory diagram of an operation of the torsion ring gasket shown in FIG.

FIG. 4 is a partial cross-sectional view of one embodiment when the torsion ring gasket of the present invention is assembled to a supporting gasket.

FIG. 5 is a partial cross-sectional view of one embodiment when the torsion ring / gasket of the present invention is assembled in a groove provided on a sealing surface of a mating part.

FIG. 6 is a partial cross-sectional view of another embodiment of the torsion ring gasket of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torsion ring gasket 2 Supporting gasket 3a, 3b Mating part 10, 10b Ring 11, 11b Convex 21 Opening 22 Caulking 31a, 31b Sealing surface 32a Groove

Claims (11)

[Claims] 1. A torsion ring gasket, wherein a ridge extending beyond the thickness of the ring is provided integrally around the ring. 2. The torsion ring gasket according to claim 1, wherein the ridge is provided integrally above an inner periphery of the ring. 3. The torsion ring / gasket according to claim 1, wherein the ridges are provided integrally above the inner periphery and below the outer periphery of the ring. 4. The torsion ring gasket according to claim 2, wherein the ring has a circular cross section, and the ridge has a triangular cross section. 5. The ring has a square cross section, and
3. The torsion ring gasket according to claim 2, wherein the ridge has an L-shaped cross section. 6. The torsion ring gasket according to claim 1, wherein the ring is made of a metal material. 7. The torsion ring gasket according to claim 1, wherein the ring is made of a resin material. 8. A rubber coating is applied to the surface.
The torsion ring gasket according to claim 1. 9. The torsion ring gasket according to claim 1, wherein the gasket is provided inside the opening of the supporting gasket. 10. The torsion ring gasket according to claim 1, wherein the upper and lower surfaces of the opening of the supporting gasket are caulked. 11. The torsion ring / gasket according to claim 1, wherein the torsion ring / gasket fits into a groove provided on one sealing surface of a pair of mating parts.