JP2875230B2 - Metal laminated 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 metal laminated gasket in which a first plate and a second plate are overlapped with each other to form a gasket base material.

[0002]

2. Description of the Related Art A laminated metal gasket in which a first and a second plate are superposed on each other to form a gasket base material has a cylinder hole formed therein, and a folded portion for preventing gas leakage from the cylinder hole. A metal ring is provided in the portion, and the gas ring is prevented by the metal ring such that the sealing surface pressure is intensively generated in the folded portion as compared with the portion other than the folded portion.

[0003]

In the conventional example, when a folded portion provided with a metal ring is compared with a portion other than the folded portion, gas leakage occurs due to a concentrated seal surface pressure at the folded portion. Although it can be prevented, depending on the position of the tightening bolt (bolt hole in the case of gasket) or the relationship between the part between cylinder holes and other parts, etc.
It is not necessary for the entire area of the folded portion to generate a uniform sealing surface pressure, and the generation of the sealing pressure may rather be a cause of gas leakage.

SUMMARY OF THE INVENTION The present invention has been made by focusing on such a drawback of a metal-laminated gasket in which a first plate and a second plate are overlapped with each other to form a gasket base material, and is more practical than a conventional example. It was created to provide a certain product.

[0005]

A gasket material is constituted by a first plate and a second plate which are superimposed on each other, and the first plate is folded back on the second plate side without overlapping the second plate. Providing a folded portion constituting a hole, between the folded piece constituting the folded portion and the first plate, at least a part of the outer peripheral edge,
A metal ring having a wide portion is interposed, and the wide portion of the metal ring is engaged with a concave edge provided on an inner peripheral edge surrounding the cylinder hole of the second plate.

[0006]

[Effects] Since the wide portion of the metal ring reduces the tightening load of the tightening bolt, the folded portion where the wide portion is located has a reduced seal surface pressure as a whole, and the reduced portion is folded. The gasket can be provided with a well-balanced seal surface pressure distribution as a whole, distributed to the other parts of the part, and the wide part of the metal ring is engaged with the concave edge so that the metal ring is Since it does not rotate (move) along the periphery of the metal ring, it is possible to provide a product that reliably prevents gas leakage due to the rotation of the metal ring.

[0007]

1 shows an embodiment of a metal laminated gasket according to the present invention. FIG. 1 is a partially cutaway front view, and FIG.
FIG. 3 is a sectional view taken along line bb of FIG. 1.

Reference numeral 1 denotes a first plate constituting the gasket base material A. Reference numeral 2 denotes a second plate which is superposed on the first plate 1 to constitute the gasket base material A. On the side, and the second plate 2
A folded portion 4 is formed so as to form a cylinder hole 3 by being folded so as not to overlap with a metal ring 6 surrounding the cylinder hole 3 between a folded piece 5 constituting the folded portion 4 and the first plate 1. Is interposed.

The metal ring 6 includes a wide portion 6a and a narrow portion 6b, and the wide portion 6a is inserted into a bolt hole 7 provided in the gasket base material A (the first plate 1 and the second plate 2). A portion 8 of the wide portion 6a, which is disposed closer to the narrow portion 6b and protrudes from the folded portion 4, is connected to the cylinder hole 3 of the second plate 2.
Is engaged with a recessed edge 9 provided on the inner peripheral edge surrounding.

It is needless to say that the metal ring 6 does not need to be limited to the shape (in plan view) of the embodiment. For example, the entire periphery of the metal ring may protrude from the folded portion 4.

FIG. 11 shows a bead provided on the second plate 2 and surrounding the cylinder hole 3.
Performs the function of a secondary seal.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a sectional view taken along line bb of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st plate 2 2nd plate 3 Cylinder hole 4 Folding part 5 Folding piece 6 Metal ring 6a Wide part 9 Recessed edge

Claims (1)

(57) [Claims] 1. A gasket base material is formed by a first plate and a second plate which are superimposed on each other, and a cylinder hole is formed by folding the first plate on the second plate side without overlapping the second plate. A metal ring having at least a portion of an outer peripheral edge thereof as a wide portion is interposed between a folded piece constituting the folded portion and the first plate, and the wide portion of the metal ring is provided. And a metal-laminated gasket engaged with a concave edge provided on an inner peripheral edge surrounding the cylinder hole of the second plate.