JPH0828707A - Gasket - Google Patents

Abstract

PURPOSE:To enable equal sealing throughout a gasket between fastening bolt holes by changing the shape of printed seals applied to both sides of the gasket between the fastening bolt holes so that face pressure at time center with lower face pressure between the fastening bolt holes can be increased, compared with that in areas with higher face pressure around the fastening bolt holes. CONSTITUTION:A printed seal 4a which has a length L1 in the longitudinal direction to the vicinity of fastening bolt holes 2a, 2b and a width D1 is applied to one single side of a gasket 1 between the fastening bolt holes 2a, 2b while a printed seal 4b which has a length L2 in the longitudinal direction smaller than the length L1 of the printed seal 4a and a width D2 smaller than the width D1 is applied to the other single side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket made of steel or soft laminate used for a cylinder block of an engine.

[0002]

2. Description of the Related Art As shown in FIG. 5, a gasket 1 used for an engine cylinder block or the like has a longitudinal direction up to the vicinity of the fastening bolt holes 2a, 2b on both sides or one side between the fastening bolt holes 2a, 2b. Print seals 3a and 3b made of silicon or the like having a length L are formed.

[0003]

In the above-mentioned conventional gasket, the surface pressure due to the tightening bolt is high in the vicinity of the tightening bolt holes 2a and 2b, and the surface pressure is low in the central portion between the tightening bolt holes 2a and 2b. Therefore, tightening bolt hole 2
The print seals 3a, 3b formed with the length L in the longitudinal direction up to the vicinity of a, 2b can effectively obtain the sealing action in the vicinity of the tightening bolt holes 2a, 2b having a high surface pressure. The print seals 3a, 3b are regulated by tightening the print seals 3a, 3b in the high tightening bolt holes 2a, 2b, and the press contact force of the print seals 3a, 3b in the central portion between the tightening bolt holes 2a, 2b with a low surface pressure is reduced, and the tightening bolts are reduced. In some cases, a uniform sealing action could not be obtained on the entire length surface between the holes 2a and 2b.

An object of the present invention is to provide a gasket which solves the above-mentioned conventional problems due to the change in the shape of the print seal.

[0005]

A feature of the present invention for achieving the above object is to provide a structure in which both sides of a fastening bolt hole formed in a gasket base material are provided on both sides with a longitudinal direction between the fastening bolt holes. And a length in the width direction orthogonal to the longitudinal direction are different from each other.

[0006]

With the above structure, the double-sided print seals having different lengths in the longitudinal direction between the tightening bolt holes can be provided.
The total thickness of the print seals on both sides is that the central area between the tightening bolt holes with a low surface pressure is thicker than the area of the tightening bolt holes with a high surface pressure, and The surface pressure of the lower part of the is increased, and a uniform sealing action is obtained over the entire length surface between the tightening bolt holes. Further, by making the length in the width direction orthogonal to the longitudinal direction different, even if there is a print position deviation of a print seal having a narrow width on one side, it can be kept within the range of the print seal on the wide side of one side. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a steel gasket, 2
Reference numerals a and 2b denote tightening bolt holes, and 4a denotes a print sticker on one side.

The details of the configuration of the present invention will be described with reference to FIGS. Print seals 4a and 4b are provided on both surfaces between the tightening bolt holes 2a and 2b formed in the gasket 1.
The print sticker on one side of which is attached 4
a is a length L1 in the longitudinal direction between the tightening bolt holes 2a and 2b, which is a long length up to the vicinity of the tightening bolt holes 2a and 2b, and the length L2 in the longitudinal direction of the print seal 4b on the other side is the length of the one side. The length L1 is shorter than the length L1 of the print sticker 4a on one side, and L1> L2.

As for the length in the width direction orthogonal to the longitudinal direction, the print seal 4a on one side is wider than the width D1 and the width D2 of the print seal 4b on the other side is the print seal 4a on the one side. D1 shorter than the width D1
> D2.

As shown in FIG. 2, it is effective that the print seals 4a and 4b have a wing-like cross-sectional shape in which both ends in the vicinity of the tightening bolt holes 2a and 2b are thin and the central portion is wide bulged.

Since the present invention has the structure as described above, the length L is provided in the vicinity of the tightening bolt holes 2a and 2b having a high surface pressure.
The thickness of only one print seal 4a is large, and the central portion between the tightening bolt holes 2a and 2b having a low surface pressure is located near the tightening bolt holes 2a and 2b due to the total thickness of the print seals 4a and 4b on both sides. It becomes thicker than the part, and as a result, the surface pressure of the central portion between the tightening bolt holes 2a and 2b when tightened by the bolt is increased, and a uniform sealing action is exerted over the entire length surface between the tightening bolt holes 2a and 2b. Is obtained.

The width of the print seals 4a and 4b orthogonal to the longitudinal direction is set to be wider than the width D1 of the print seal 4a on one side, and the width D2 of the print seal 4b on the other side is set to the width of the one side of the print seal 4a. By making the width D1 shorter than the width D1 of the other side, even if the print position of the print sticker 4b on the other side is displaced, it can be contained within the range of the print sticker 4a on the wide side of the width D1 and the double-sided seal function is sufficiently achieved. Secure.

[0013]

As described above, according to the present invention, the print seals provided on both surfaces of the tightening bolt holes of the gasket have different shapes in length and width in the longitudinal direction between the tightening bolt holes. The surface pressure of the central part between the tightening bolt holes, which has a lower surface pressure than that of the tightening bolt holes with a high surface pressure, is increased, and a uniform seal is obtained over the entire length surface between the tightening bolt holes. To be

[Brief description of drawings]

FIG. 1 is a front view showing an example of a gasket of the present invention.

FIG. 2 is an enlarged view of an arrow A portion of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along the line CC of FIG.

5 is a cross-sectional view of a conventional gasket corresponding to the line BB of FIG. 2.

[Explanation of symbols]

 1 Gasket 2a Tightening bolt hole 2b Tightening bolt hole 4a Print sticker with length L1 and width D1 4b Print sticker with length L2 and width D2

Claims (1)

[Claims] 1. A length in a longitudinal direction between the tightening bolt holes and a length in a width direction orthogonal to the longitudinal direction are provided on both surfaces between the tightening bolt holes formed in a metal plate forming a gasket base material. A gasket characterized in that different print seals are formed.