JP2605613Y2 - gasket - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a gasket used as a sealing means for joining two members joined to each other.

[0002]

2. Description of the Related Art In an apparatus in which two kinds of members are joined by fastening means such as bolts, a gasket in which a rubber-like elastic material is coated on both sides of a reinforcing member made of a metal plate is often used.

[0003] Fig. 2 shows an example of the above-mentioned gasket, in which coatings 2 and 3 made of a rubber-like elastic material are applied to both side surfaces of a reinforcing member 1 using a steel plate, and are locally bent. A bead 4 is formed.

[0004]

The gasket described above has a sealing function due to the elasticity of the coatings 2 and 3 applied to both sides when the gasket is pressed by two members joined to each other. 1 resists the pressing force by the mechanical strength, but has the following problems due to the formation of the protruding beads 4.

That is, since the bead 4 protrudes from one surface, the surface pressure applied to each surface is not equal,
In particular, since concentrated pressure is distributed at the top of the bead 4, there is a high possibility that the coating 2 may protrude near the top of the bead 4 to cause deterioration of the sealing function.

By increasing the rubber hardness of the coatings 2 and 3, the protrusion of the top of the bead 4 can be suppressed, but in this case, the pressure resistance per unit area on the surface opposite to the bead 4 is reduced. Is excessively large, which may cause a decrease in the sealing function.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the conventional gasket.
The thickness of the coating layer applied to both sides of the reinforcing member is made substantially the same, and the rubber hardness of the coating applied to the surface where the beads protrude is set higher than the rubber hardness of the coating applied to the opposite surface. It is the structure which was made.

[0008]

In the gasket of the present invention having the above-mentioned structure, the first coating having a high rubber hardness applied to the projecting surface of the bead suppresses the protrusion at the top of the bead, and the opposite surface. The second coating having a low rubber hardness applied to keeps the pressure resistance per unit area at an appropriate value.

[0009]

In the embodiment of FIG. 1, the rubber hardness of the first coating 2 applied to the surface of the reinforcing member 1 made of steel plate from which the bead 4 protrudes is the second coating applied to the opposite surface. It is set higher than the rubber hardness of the coating 3 of No. 2.

[0010]

As described above, in the gasket according to the present invention, the thickness of the coating layer applied to both surfaces of the reinforcing member is made substantially the same, and the rubber hardness of the coating applied to the surface from which the beads protrude is reduced. By having a structure set higher than the rubber hardness of the coating applied to the opposite surface, the protrusion at the top of the bead is suppressed and the surface pressure per unit area of the opposite surface is reduced. , The sealing performance on both sides is maintained in a balanced manner.

[0011]

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an example of a conventional gasket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement member 2 1st coating 3 2nd coating 4 Bead

Claims (1)

(57) [Scope of request for utility model registration] 1. A reinforcing member made of a metal plate is coated on both sides with a rubber-like elastic material having substantially the same thickness,
In the gasket in which the reinforcing member is formed with a bead by bending, a rubber hardness of a coating applied to a surface on a side where the bead projects is set to be higher than a rubber hardness of a coating applied to another surface. Gasket.