JPH06265021A - Metallic gasket - Google Patents

Abstract

PURPOSE:To provide a highly reliable inexpensive metallic gasket by which various characteristics such as sealing performace and strength can be secured by making a bead formed on a metallic plate excellent in heat resistance and elasticity different according to a part. CONSTITUTION:(1) is a metallic plate excellent in elasticity and heat resistance, and is composed, for example, of SUS304, SUS310, SUH309, SPCC, SECC and the like, and both surfaces of the metallic plate 1 is coated with heat resistant resin or rubber, and plural bore opening holes 2 and fastening bolt holes 3 are opened. A bead between the mutual bore opening holes 2 is formed as a straight line full bead 4 having an angle shape cross section, and a bead on the periphery except a part between the mutual bore opening holes 2 is formed as a half bead 5 having a half angle shape cross secion, and is continued to the full bead 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head gasket for sandwiching and sealing a cylinder block and a cylinder head, or an intake manifold for sandwiching and sealing between a cylinder head and an intake manifold. The present invention relates to a metal gasket composed of one elastic metal plate used for a gasket or the like.

[0002]

2. Description of the Related Art A conventional metal gasket of this type is a metal gasket which forms a bead on an elastic metal plate for sealing, and a bead of a bead meeting portion for sealing each sealing portion provided on the elastic metal plate. What is characterized in that the width is formed to be substantially equal to the bead width of the non-association portion is disclosed and known in JP-A-63-210465.

[0003]

In the conventional metal gasket constructed as described above, since the spring constant of the associating portion does not become smaller than that of the non-associating portion, it is possible to avoid a decrease in the sealing pressure at the associating portion. Therefore, it is possible to prevent leakage of gas, oil, etc., and to achieve an effective seal without uneven sealing pressure exerted on the joint surface. However, each sealing part is sealed. Not only is it extremely difficult to process the bead width at the bead's meeting area to be approximately the same as the bead width at the non-association area, but it also causes deterioration of the stress conditions due to changes in the bead shape, resulting in higher manufacturing costs. And there was a problem to be solved in reducing durability.

An object of the present invention is to solve the above-mentioned problems, and the bead formed on the metal plate having excellent heat resistance and elasticity is made to differ depending on the site, and various characteristics such as sealing property and strength are secured. It is to provide a metal gasket having high performance at a low cost.

[0005]

The present invention has been made to solve the above-mentioned problems, and is made of a metal plate having excellent heat resistance and elasticity, and is formed with a plurality of opening holes. In a metal gasket in which a bead is formed so that the entire circumference of the opening hole serves as a seal portion, the bead between the opening holes is
With a full bead having a chevron cross section, a bead around the openings other than between the opening holes is formed into a half bead having a hemispherical cross section, and the joining portions of the half beads formed between the opening holes are continuous with the straight full bead. The gist is a metal gasket characterized by being made.

[0006]

As described above, the bead between the opening holes is a full bead having a chevron cross section, and the bead around the holes other than between the opening holes is a half bead having a semi- chevron cross section, which results in a smooth shape. Further, the workability of the bead is improved, the surface pressure is not reduced, the stress is not increased, and the durability is improved, and excellent sealing properties can be secured.

[0007]

EXAMPLE An example of the metal gasket according to the present invention will be described below with reference to the cylinder head gasket shown in the drawings. 1 is a partial plan view of the metal gasket, FIG. 2 is an enlarged end view taken along line AA of FIG. 1, and FIG. 3 is an enlarged end view taken along line BB of FIG.

In FIG. 1, reference numeral 1 denotes a metal plate having excellent elasticity and heat resistance, for example, SUS304SUS310, SUH309, SPCC.
(Cold rolled steel plate), SECC (Electrogalvanized steel plate) (Hv =
150 or more), heat-resistant resin or rubber is coated (not shown) on both sides of the metal plate 1, and a plurality of bore opening holes 2 and tightening bolt holes 3 are provided.

The bead between the bore opening holes 2 is a straight bead 4 having a chevron cross section, and the bead around the portion other than between the bore opening holes 2 is a half bead 5 having a hemispherical cross section. It is a continuous structure.

The cross-sectional shape of the half bead and the full bead is not limited to the above, but as shown in the full bead in FIG. When using one of the measures for securing the value, or as shown in FIG. 5, a flat portion 6 is formed on the top (or groove bottom) of the full bead, and the stress value can be lowered as the curved corner R, In some cases, the durability may be improved.

The metal gasket is mounted between a cylinder head and a cylinder block of an internal combustion engine, and when tightened with a fastening bolt, the half beads and the full beads are elastically deformed to form a seal line on the joint surface, and gas or oil leaks. To prevent.

Although the above embodiment has been described with reference to the cylinder head gasket, the present invention is not limited to this, and it goes without saying that the intake manifold gasket and the like may have the same structure.

[0013]

In the metal gasket according to the present invention described above, the bead between the opening holes is a full bead having a chevron cross section, and the bead around the portions other than between the opening holes is a half bead having a semi chevron cross section. By forming it into a smooth shape, the bead processability is improved, the surface pressure does not decrease, the stress does not increase, the durability is good, and excellent sealing performance is achieved. Can be secured.

Therefore, according to the present invention, the bead formed on the metal plate excellent in heat resistance and elasticity is simplified by making it different depending on the sealing portion, and a highly reliable metal gasket ensuring various characteristics such as sealing property and strength. Can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partial plan view of a metal gasket according to the present invention.

FIG. 2 is an enlarged end view taken along line AA of FIG.

FIG. 3 is an enlarged end view taken along line BB of FIG.

FIG. 4 is an enlarged end view taken along the line AA of FIG. 1 in the case of another embodiment.

FIG. 5 is an enlarged end view taken along line AA of FIG. 1 in the case of a further embodiment.

[Explanation of symbols]

 1 Metal plate 2 Bore opening hole 3 Bolt hole 4 Full bead 5 Half bead

Claims (2)

[Claims] 1. A metal plate having excellent heat resistance and elasticity,
In a metal gasket having a plurality of opening holes formed therein and forming a bead so that the entire circumference of the opening hole serves as a seal portion, the bead between the opening holes is a full bead having a chevron cross-section, and Form the bead around each other except between the opening holes into a half bead with a semi-yama cross section,
A metal gasket, characterized in that the joining portions of the half beads formed between the opening holes are continuous by the straight full beads. 2. The metal gasket according to claim 1, wherein both surfaces of the metal plate are coated with heat resistant resin or rubber.