JPH0531255Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a metal laminated gasket for internal combustion engines.

Prior Art Most conventional metal laminated gaskets for internal combustion engines have four to five component plates, as shown in Figures 1 and 2.
The seal structure is usually a single piece, and the seal structure is a bead 3 on the inside of the folded piece provided by folding back the upper or lower plate.
It has a complex structure with wires, wires, etc.

Problems to be solved by the invention Since the conventional example has the above-mentioned configuration, it not only has considerable restrictions on its use in small engines where weight reduction and low cost are important, but also beads etc. on the inside of the folded piece. This has the drawback that it is unclear whether the beads, etc. that ensure sealing surface pressure are placed in the correct position, and it is difficult to determine whether there are any defects unless it is actually installed in the engine. Also,
The more the number of plates that make up the gasket, the more
There is also the disadvantage that the thickness accuracy of the gasket becomes difficult to achieve as designed.

From the perspective of thickness accuracy, for example,
The single metal gasket described in Utility Model Application Publication No. 139057/1987 can be mentioned, but the single metal gasket does not have the technical problems of manufacturing errors or thickness accuracy in the sense mentioned above in the metal laminated gasket. In addition, although it can be applied to engines equipped with tightening bolts with a large tightening torque, it is unsuitable for small engines such as motorcycles (it is not practical unless it is made of a rigid material).
Since there is no so-called relief plate, the tightening force of the tightening bolt is directly applied to the bead or folded portion forming the sealing portion, which poses a problem in terms of processing accuracy.

Means for solving the problem: The gasket body is constructed only by the first and second constituent plates, and the sealing portion is placed between the flat part of the first constituent plate and the first constituent plate towards the second constituent plate. It is composed of a folded piece that is folded back and gently sloped, and is directly overlapped with the flat part.

Embodiment To explain the present invention using an embodiment, FIG. 3 shows a cross section of the combustion chamber hole sealing part of the cylinder head gasket of an internal combustion engine, and is made up of only the first component plate 5 and the second component plate 6. The first component plate 5 of the main body A is folded back at the combustion chamber hole to form a folded piece 8 that constitutes the seal portion 7, and the gently folded folded piece 8 and the first constituent plate 5 are folded back to form a gasket body A. The flat portion 5a of the seal portion 7 constitutes the seal portion 7, and a minute space α is provided in the seal portion 7.
It provides an effective cushioning effect to the seal. The second component plate 6, which does not overlap with the first component plate 5, has a role of adjusting the magnitude of the surface pressure between the seal portion and the flat portion when the gasket is tightened by varying the plate thickness.

Effects of the invention: Since the seal part is made up of the flat part of the first component plate, when installing and tightening this gasket, it is installed in close contact with the mounting surface of the engine from the beginning, and the folded piece is smooth. Since it is constructed with an inclination, the sealing portion of the gasket is smoothly deformed by tightening, and sealing surface pressure can be applied directly to the mounting surface of the engine.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing the seal structure of a conventional metal laminated gasket. FIG. 3 is a sectional view showing an embodiment of the present invention. 5...First constituent plate, 5a...Flat portion, 6...
...Second constituent plate, 7...Seal portion, 8...Folding piece.

Claims (1)

[Scope of utility model registration request] The gasket main body is constituted by only the first component plate and the second component plate, and the sealing portion is formed by folding back the flat part of the first component plate and the first component plate toward the second component plate to gently incline the gasket body. A metal laminated gasket for internal combustion engines, consisting of a folded piece directly stacked on a flat part.