JPH0547325Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[0001]

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

[0002]

[Prior Art] Most conventional metal laminated gaskets for internal combustion engines usually have 4 to 5 constituent plates, and the seal structure is either an upper plate or a lower plate, as shown in FIGS. 3 and 4. It has a complicated structure in which beads a, wires b, etc. are arranged inside the folded piece that is folded back.

【0003】

[Problems to be solved by the invention] Since the conventional example has the above-mentioned configuration, there are considerable restrictions on its use in small engines where weight reduction and low cost are important, and there is also a bead on the inside of the folded piece. etc., so it is unclear whether the beads, etc. that ensure sealing surface pressure are placed in the correct position, and it is difficult to tell whether there are any defects unless it is actually installed in the engine. Another drawback is that the greater the number of gasket constituent plates, the more difficult it becomes to achieve the thickness accuracy of the gasket as designed.

[0004] From the perspective of this thickness accuracy,
For example, the single metal gasket described in Utility Model Application Publication No. 139057/1983 can be mentioned, but the single metal gasket has the technical problems of manufacturing errors and thickness accuracy in the sense mentioned above in the metal laminated gasket. Also, 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), and it is not suitable for small engines such as motorcycles. Since there is no plate, the tightening force of the tightening bolt is directly applied to the bead or folded portion that constitutes the sealing portion, which poses a problem in terms of processing accuracy.

[0005]

[Means for Solving the Problems] Consisting of a pair of first and second constituent plates, the first constituent plate is provided with a folded piece that constitutes a sealing part, and the back side of the folded piece is directly attached to the first constituent plate. The structure is such that the second component plate is polymerized and arranged without overlapping the folded piece.

【0006】

[Embodiment] Figures 1 and 2 are cross-sectional views showing one embodiment of the metal laminated gasket for internal combustion engines of the present invention. In the figures, 1 is the first component plate, 2 is the second component plate, and gasket A is It is composed of a pair of these constituent plates.

[0007] The first component plate 1 includes a main body 11 and a seal hole 4.
The folded piece 3 constituting the seal portion surrounding the main body 1
1 and the seal portion 5, and a flat portion 14 that overlaps the folded piece 3 and forms the seal portion 5.

[0008] In the seal portion 5, a small space α is provided between the folded piece 3 and the flat portion 14 to provide an effective cushioning effect to the seal.

[0009] Then, on the back side of this folded piece 3, it is directly superposed on the main body 11 of the first component plate 1,
In addition, the second component plate 2 is arranged without overlapping the folded piece 3. The second component plate 2 has a role of adjusting the magnitude of the surface pressure between the seal portion and the main body when the gasket is tightened by varying the plate thickness.

[0010] Figure 2 shows the state of use, and shows the surface pressure distribution that occurs when the gasket in Figure 1 is tightened with a bolt (not shown) (this surface pressure distribution is based on the JIS pressure-sensitive paper test results). Due to the action of the portion 12, the surface pressure generated near the end of the folded piece 3 increases, and the width of the surface pressure generated in the seal portion 5 increases.Moreover, the surface pressure acts directly on the mounting surface of the engine. , a synergistic effect is created that improves sealing performance despite the simple structure.

[0011]

[Effects of the invention] The present invention solves the drawbacks of conventional metal laminated gaskets, which have a large number of overlapping component plates, such as the disadvantage in the accuracy of gasket thickness, and the problem that each component plate is placed in the correct position. The problem of not being able to tell from the outside appearance whether the seal is present or not has been solved by using two component plates, and by adjusting the thickness of the second component plate placed on the back side of the folded piece, it is possible to adjust the surface pressure of the seal part. can be adjusted. In addition, the first component plate portion located between the second component plate and the seal portion increases the width in which surface pressure is generated in the seal portion, and the generated surface pressure can be applied directly to the engine.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view.

FIG. 2 is a sectional view showing a state of use.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

1...First component board 2...Second component board 3... Folded piece 5...Seal part

Claims (1)

[Scope of utility model registration request] Consisting of a pair of first and second constituent plates, the first constituent plate is provided with a folded piece that constitutes a sealing part, and the folded piece is directly superimposed on the first constituent plate on the back side of the folded piece, and is attached to the folded piece. A metal laminated gasket for internal combustion engines with a second component plate arranged without overlapping.