JPH0842696A - Metal gasket - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a laminated metal gasket that does not use a joining part and is not restricted by the number of laminated sheets or different materials and has a strong joining force. [Structure] The joint portion B that joins the three metal thin plates 1, 3, and 2 constituting the metal gasket A is formed by press punching using a punch die in the YY line direction.
Inclined plate portions 1b, 3b, 2 continuous with the thin metal plates 1, 3, 2
b-bottom plate portions 1c, 3c, 2c-tilted plate portions 1b, 3b, 2
The concave portion formed by b is deformed, and in the ZZ line direction orthogonal to the YY line direction, the inclined plate portion-the bottom plate portion-the inclined plate portion is deformed into a concave portion cut out from a thin metal plate. The bottom plate portion of the recess is pressed by a press or the like to make the width of the bottom plate portion in the Z-Z line direction wider than the width of the opened opening portion, so that they are joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket, and more particularly to an improvement of a laminated metal gasket formed by stacking a plurality of thin metal plates.

[0002]

2. Description of the Related Art Conventionally, as a metal gasket for an exhaust gas seal of an automobile (exhaust manifold gasket, exhaust pipe gasket, etc.), a laminated metal gasket formed by laminating a plurality of metal thin plates,
As a metal gasket for air-fuel mixture sealing (intake manifold gasket, etc.), a laminated metal gasket formed by laminating a plurality of metal thin plates, which are surface-treated with rubber or the like, is often used.

When the laminated metal gasket is composed of, for example, three metal thin plates (steel plates), the center metal thin plate (sub plate) and the metal thin plates (main plate) on both sides thereof are commonly provided with a port hole and a gasket. Mounting holes and the like are provided, and sealing beads are formed on the metal thin plates on both sides surrounding the port holes, and these three metal thin plates are formed at the required positions, for example, (1)
They are integrally joined by eyelet assembly, (2) riveting, (3) spot welding, (4) outer peripheral edge folding (clinching), etc.

[0004]

The means for joining the thin metal plates has the following drawbacks. (1) Eyelet assembly requires a separate connecting part and increases man-hours, resulting in an increase in cost. Moreover, since a plurality of eyelets are usually used, problems such as defective eyelets during processing and defective processing may occur. (2) Similar to eyelet assembly, riveting requires separate parts, increasing man-hours, missing rivets, and processing problems. (3) Spot welding involves (a) when the number of laminated layers is large, (b) when the metal plate thickness is thick, (c) when laminating dissimilar materials, (d) metal with surface treatment such as rubber When using a thin plate, welding is not possible ((D) is not possible),
Welding strength is unstable (variable), welding condition management is technically difficult, and man-hours increase. (4) Clinching has problems such as cost increase due to an increase in mold material cost and man-hours and deviation of laminated metal thin plates.

[0005]

OBJECT OF THE INVENTION The present invention does not use connecting parts and
There is no restriction on the number of layers and different materials, and
It is also possible to use a thin metal plate with a surface treatment such as rubber,
It is an object of the present invention to provide a metal gasket that can obtain a strong bonding force.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a metal gasket constituted by laminating one or more sheets of a metal thin plate, a surface-coated metal thin plate and / or a plated metal thin plate, in a thickness direction of the laminated metal thin plate or the like. By press punching into the laminated metal, it is transformed into a continuous concave portion (or convex portion) in one direction, and in the direction intersecting with the direction, by the joint portion transformed into a cut-out concave portion (or convex portion), the laminated metal The gist is that thin plates and the like are integrally joined.

[0007]

According to the above construction, the laminated metal thin plates and the like are integrally joined at the joining portion which is partially press-punched by the roll caulking action during the working. Moreover,
The formation of this joint does not require any joint parts, is not limited by the number of laminated layers, and uses a metal plate surface-treated with rubber, synthetic resin, or the like, or a metal plate whose surface is plated with Al, Zn, or the like. Is also possible.

[0008]

1 to 4 show an example in which the present invention is applied to a metal gasket for an exhaust manifold. In the figure, A is a metal gasket composed of three metal thin plates (steel plates with a thickness of 0.2 to 0.7 mm), 1 and 2 are metal thin plates (main plate) on both sides, and 3 is an intermediate metal thin plate (sub plate). ), 4 is a port hole (gas distribution hole), 5 is a gasket mounting hole, 1a, 2
Reference character a is a bead for sealing a port hole formed on the metal thin plates 1 and 2, and reference character B is a connecting portion for integrally connecting the three metal thin plates.

The joint portion B is obtained by, for example, press punching using a punch die. That is, by press punching in the thickness direction of the laminated metal thin plate,
In the Y-Y line direction of FIG. 1A, as shown in FIG. 3, the inclined plate portions 1b, 3b, 2b continuous with the thin metal plates 1, 2, 3 are provided.
-Bottom plate parts 1c, 3c, 2c-Sloping plate parts 1b, 3b, 2b
As shown in FIG. 4 and FIG. 1 (b), the inclined plate portions 1b, 3b, 2b-bottom plate are deformed into a concave portion made of, and in the ZZ line direction that intersects the YY line direction at right angles. Part 1
c, 3c, 2c-The inclined plate portions 1b, 3b, 2b are deformed into concave portions cut out from the thin metal plates 1, 2, 3. The recess bottom plate portion is further pressed by a press or the like to make the width of the bottom plate portion in the ZZ line direction wider than the width of the opened opening portion, thereby forming the integrally joined portion B.

[0010]

As described above in detail, according to the present invention, no joining parts are used, there is no restriction on the number of laminated layers and different materials, and a surface treatment such as rubber is applied. It is possible to obtain a metal gasket having a joint part that enables the use of a thin metal plate.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 (a) is a plan view of a metal gasket for an exhaust manifold,
FIG. 1B is an enlarged perspective view of the connecting portion.

FIG. 2 is an enlarged sectional view taken along line XX of FIG.

FIG. 3 is an enlarged sectional view taken along line YY of FIG.

FIG. 4 is an enlarged sectional view taken along line ZZ in FIG.

[Explanation of symbols]

 A metal gasket 1, a metal thin plate serving as a main plate 3 a metal thin plate serving as a sub plate 1a, 2a beads 1b, 2b, 3b inclined plate portions 1c, 2c, 3c bottom plate portion

Claims (1)

[Claims] 1. A metal gasket formed by laminating one or more sheets of a thin metal plate, a surface-coated thin metal plate and / or a plated thin metal plate, wherein a laminated metal thin plate or the like is formed by press punching in the thickness direction. In the direction intersecting with the above direction, the laminated metal thin plates and the like are integrally joined by the joining portion transformed into a continuous concave portion (or convex portion) and in the direction intersecting the direction. A metal gasket characterized in that