JPH081330Y2 - Metal laminated gasket - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal laminated gasket, and more particularly to a metal laminated gasket effective for use as a cylinder head gasket of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in a metal laminated cylinder head gasket mounted between a cylinder block and a cylinder head of an internal combustion engine, two or more metal plates are laminated to form a metal plate. The outer plates on both sides are assembled by encapsulating the middle plates sandwiched as necessary. In such a gasket, the laminated thickness of the metal plate (the total thickness of each metal plate) in the combustion chamber hole seal portion and the fluid hole seal portion around the other fluid hole is formed to be larger than the other flat portions. Thereby, the surface pressure at the time of tightening is concentrated on the portion, and the sealing effect is enhanced.

As means for partially increasing the lamination thickness of the metal plate, a method is used in which a part of the metal plate is folded and another metal plate is sandwiched between the folded portions. In this case, in order to prevent the laminated thickness of the folded portion of the metal plate from becoming excessively thick and slightly thicker than other flat portions, it is usual that the folded portion of the metal plate overlaps with the folded portion. Consideration is given such as cutting away a part of another thinner metal plate to provide an escape portion or folding back a part of a very thin metal plate.

However, in order to adjust the laminated thickness by such means, in the former case, a metal plate having a required thickness for providing the relief portion is prepared in advance, or the thickness of each metal plate is delicately adjusted. Adjustment, or in the latter case, a special thin metal plate for folding back must be prepared.Therefore, an extra number of metal plates is needed only for adjusting the laminated thickness. However, there is a problem that the thickness of each metal plate is limited, or the thickness of the folded metal plate cannot be set to a certain value or less, so that the surface pressure cannot be adjusted due to a slight difference in thickness.

[0005]

The technical problem of the present invention is that, in a metal laminated gasket, the lamination thickness of a metal plate in a combustion chamber hole seal portion is formed to be thicker than other flat portions and tightened to that portion. In concentrating the surface pressure at the time, to enhance the sealing effect, it is not necessary to adjust the thickness of each metal plate in advance, and moreover, it is to make it easier and easier to adjust the lamination thickness of the folded portion. .

[0006]

[Means for Solving the Problems]
Therefore, the metal laminated gasket of the present invention is made up of a plurality of metal plates.
It is formed by stacking the
Part of the stacked metal plates are folded back and sandwiched with the other metal plates.
By inserting the metal plate in the combustion chamber hole seal part,
Form the laminated thickness thicker than other flat parts and tighten in that part.
Use a gasket that concentrates the surface pressure during mounting.
AndEither except the metal plate with the above-mentioned folded back part
In the metal plateThe part where the folded part touchesOne side of
Due to partial compression deformation, At the folded portion
The stack thickness of the metal plateSuitable for sealing combustion chamber holesKey
It is characterized in that a step is formed so as to be knotted.

[0007]

In the above-mentioned gasket, when a part of the laminated metal plates in the combustion chamber hole seal portion is folded back to form the laminated thickness of the metal plate in the combustion chamber hole seal portion thicker than other flat portions, Metal with the above-mentioned folded portion
In any one of the metal plates except the plate, a step due to partial compressive deformation is formed on one surface of the portion where the folded-back portion abuts, whereby the laminated thickness of the metal plate in the folded-back portion is sealed in the combustion chamber hole. Since the thickness is adjusted to suit the thickness, it is easier to adjust the thickness compared to the case of stacking metal plates that have been adjusted to the required thickness in advance, and at the same time, fine adjustment of the laminated thickness of the folded part Will be easier.

[0008]

1 to 3 show a first embodiment of a metal-laminated cylinder head gasket according to the present invention. This gasket is composed of outer plates 1 and 2 formed of a metal plate and wrapping between them. The required number of combustion chamber holes 1 with the combined middle plate 3
1, a fluid hole including a water hole 12, an oil hole 13 and the like, a bolt hole 14 and the like are appropriately provided, and a fluid hole seal portion is provided at an inner peripheral edge of these fluid holes. That is, the combustion chamber hole seal portion 21 is formed on the inner peripheral edge of the combustion chamber hole 11, the water hole seal portion 22 is formed on the inner peripheral edge of the water hole 12, and the oil hole 13 is formed.
An oil hole seal portion 23 is provided on the inner peripheral edge of the.

In the combustion chamber hole seal portion 21, as shown in detail in FIGS. 2 and 3, a part of the laminated metal plates (outer plate 1) is folded back, and another metal plate ( The outer plate 2 and the middle plate 3) are sandwiched, whereby the laminated metal plates are entirely fixed.

Thus, the metal plate (middle plate 3) at the portion where the folded-back portion 1a of the laminated metal plates abuts,
Step 3a due to partial compressive deformation due to coining
Is formed. This step 3a is for adjusting the laminated thickness of the metal plate, and can be formed on any laminated metal plate, and the processing depth thereof is shallower than the thickness of the folded portion 1a of the metal plate, Therefore, the folded portion 1a
And the depth of the compression processed portion causes the fluid hole seal portion to be formed thicker than the other flat portions.

According to the compressive deformation of the metal plate by the coining process, the depth of the step 3a can be finely adjusted as compared with the case of stacking the metal plates whose thickness is adjusted in advance. The surface pressure of the combustion chamber hole seal portion 21 can be arbitrarily adjusted by slightly changing the relationship between the depth and the plate thickness of the folded portion 1a. Further, the surface pressure can be adjusted very easily as compared with the case of using a metal plate having a required thickness in advance.

In the second embodiment shown in FIG. 4, three metal plates 4,
5 shows a case where 5 and 6 are laminated. In this case, the metal plate 4 is provided with a folded-back portion 4a similar to that in the above-mentioned embodiment,
The metal plate 5 is provided with a step 5a for adjusting the laminated thickness of the metal plate, and the metal plate (middle plate) 6 is provided with a bead 6a. This step 5a is formed by partial compressive deformation by coining as in the above-described embodiment. The number of metal plates to be laminated may be two, or three or more, and if necessary, beads may be provided on the intermediate plate as shown in the drawing.

The third embodiment shown in FIG. 5 has outer plates 7 and 8 each having a gasket made of a metal plate, and a middle plate 9 which is embedded in the outer plates 7 and 8, and further has wiring along the inner circumference of the fluid hole. The case where 10 is installed is shown. In this case, the interior of the wiring 10 can concentrate the surface pressure at the time of tightening on that portion to enhance the sealing effect. However, apart from that, as in the first embodiment, the outer surface made of a metal plate is used. At the portion where the folded-back portion 7a of the plate 7 abuts, a step 9a is formed in the metal plate (middle plate 9) by partial compressive deformation by coining. This step 9a is for adjusting the laminated thickness of the entire metal plate in the portion where the folded-back portion 7a is laminated, and the working depth thereof is shallower than the thickness of the folded-back portion 7a, and therefore,
It is formed thicker than the other flat portions by the difference between the thickness of the folded-back portion 7a and the depth of the compressed portion.

In this way, the fluid hole seal portion formed by stacking the folded portion 7a of the metal plate on the step 9a is formed thicker than other flat portions by a thickness required to obtain a required surface pressure. The surface pressure at the time of tightening is concentrated on that portion, but for that purpose, it is necessary that the portion of the wiring 10 has a similar thickness at the time of tightening. Accordingly, the wiring 10 should predict deformation of the wiring 10 during tightening and be sized and made of a suitable material in the context of the laminated fluid hole seal of the metal plate.

FIG. 6 shows a preferred compression-processed shape of the above-mentioned step on the metal plate. Corners 20b and 20c for forming the step 20a in the metal plate 20 are rounded and at the same time the step is formed. It is formed by the inclined surface 20d. According to this structure, it is possible to prevent the metal plate overlapping with the metal plate from being torn or the like due to the edge of the step 20a.

Although the seal portion 21 around the combustion chamber hole 11 has been described above, similar means can be used for the seal portions 22 and 23 of the other fluid holes, and other appropriate seals can be used. Means can also be used. That is, as illustrated in FIG. 7, the required number of metal plates 31
In a gasket in which the laminated metal sheets ~ 35 are laminated, the hole edge of one metal plate 33 of the laminated metal plates is folded back to form a folded-back portion 33a, thereby forming a seal portion or a part around the hole. Bead 3 on the metal plate
The sealing portion can be formed by providing 2a.

[0017]

As described above in detail, according to the present invention, in the metal laminated gasket constituted by laminating a plurality of metal plates, one of the laminated metal plates in the combustion chamber hole seal portion is upon folded back part, the lamination thickness of the metal plate in the combustion chamber hole seal portion is formed thicker than the other flat portion, increasing the sealing effect by concentrating the surface pressure at the time of tightening in that portion, the folded portion Provided metal
In any one of the metal plates except the plate, a step due to partial compressive deformation is formed on one surface of the portion where the folded-back portion comes into contact, whereby the laminated thickness of the metal plate in the folded-back portion is sealed in the combustion chamber hole. since so as to adjust the thickness suitable is, the metal plate thickness of one step and the folded portion
Adjust the thickness of the combustion chamber hole seal only by the difference between
Therefore, when stacking metal plates that have been adjusted to the required thickness in advance, or when there is a step on both sides of the middle plate
The difference between these two steps and the metal plate thickness on each step.
Therefore , as compared with the case where the thickness of the combustion chamber hole seal portion is adjusted, the thickness of the metal plate can be easily adjusted, and at the same time, the laminated thickness of the folded portion can be finely adjusted.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of a main part at a position AA in FIG. 1;

FIG. 3 is an enlarged cross-sectional view of an essential part taken along the line BB in FIG.

FIG. 4 is a cross-sectional view of the second embodiment of the present invention at a position similar to that of FIG. 2;

5 is a sectional view of the third embodiment of the present invention at the same position as in FIG.

FIG. 6 is a cross-sectional view of an essential part for explaining a compression processing shape of a metal plate according to the present invention.

FIG. 7 is a cross-sectional view exemplifying a seal portion structure of various fluid holes in a gasket.

[Explanation of symbols]

 1, 2 outer plate, 1a folded part, 3 middle plate, 3a step, 4, 5, 6 metal plate, 4a folded part, 5a step, 7,8 outer plate, 7a folded part, 9 middle plate, 9a step, 21 Combustion chamber hole seal part.

Claims (1)

[Scope of utility model registration request] 1. Formed by stacking a plurality of metal plates, and by folding back a part of the stacked metal plates in the combustion chamber hole seal portion and sandwiching another metal plate, the combustion chamber hole seal portion is formed. In a gasket in which the laminated thickness of the metal plate is made thicker than other flat parts and the surface pressure at the time of tightening is concentrated in that part, any metal other than the metal plate provided with the folded-back part
A step for adjusting the laminated thickness of the metal plate at the folded-back portion to a thickness suitable for sealing the combustion chamber hole is formed on one surface of the portion of the plate where the folded-back portion abuts by partial compression deformation. Characteristic metal laminated gasket.