JP2524028Y2 - Metal laminated cylinder head 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 used as a cylinder head gasket for 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. And in such a gasket, in order to form the lamination thickness of the metal plate in the seal part around the combustion chamber hole thicker than other flat parts, the metal plate around the combustion chamber hole is folded back, and the folded part is used. Means such as sandwiching another metal plate is used.

[0003] However, even if the lamination thickness in the combustion chamber hole seal portion is adjusted by such means, there is a partial difference in the surface pressure of the seal portion when the cylinder head is tightened. There is a problem that a sufficient surface pressure cannot be obtained between the cylinder heads and at a position away from the tightening bolts of the cylinder head. Therefore, in the seal portion between the combustion chamber holes, a thin metal auxiliary plate is further partially laminated on the laminated metal plate, and the lamination thickness of the portion is increased to adjust the surface pressure. Since the lamination thickness changes discontinuously in the portion where the plates are laminated, a new problem occurs in that the surface pressure also changes discontinuously. In addition, it is necessary to dispose an extra metal plate, which is the above-mentioned auxiliary plate, at a required position, and there is a disadvantage that the assembly is complicated.

[0004]

The technical problem of the present invention is to provide a metal laminated cylinder head gasket.
The lamination thickness of the metal plate in the combustion chamber hole seal portion, laminated
Folded part of the metal plate that has been placed and sandwiched another metal plate
The formed thicker than the other flat portion, impinges on enhancing the sealing effect by concentrating the surface pressure at the time of clamping the part, easy
Suitable surface pressure distribution in the sealing portion by adjusting the lamination thickness of the metal plate at the seal portion in part batchwise by easy means
It is an object of the present invention to provide a sealing means which corrects and prevents the surface pressure from changing discontinuously due to the continuous change of the lamination thickness.

[0005]

In order to solve the above-mentioned problems, the present invention is formed by laminating a plurality of metal plates, and a part of the laminated metal plates in a seal portion around a combustion chamber hole is formed. A cylinder that is folded back to sandwich another metal plate so that the lamination thickness of the metal plate at the combustion chamber hole seal portion is formed thicker than another flat portion, and the surface pressure when tightening is concentrated on that portion. In the head gasket, a step for adjusting the thickness of the metal plate by partial compression deformation is formed at a portion where the folded portion of the stacked metal plate abuts, and the depth of the step is determined by tightening the cylinder head. A technical means is used in which the surface pressure at the time is increased at a portion where the surface pressure is to be increased, and is continuously changed between other deep portions.

In the metal-laminated cylinder head gasket, the step near the bolt hole for tightening the cylinder head can be made deep, and the step can be made shallow as the distance from the bolt hole increases.

[0007]

In the above cylinder head gasket, a part of the laminated metal plate in the seal portion around the combustion chamber hole is folded back to make the laminated thickness of the metal plate in the combustion chamber hole seal portion larger than that of the other flat portions. When thickening and concentrating the surface pressure at the time of tightening, at the portion where the folded portion of the laminated metal plate abuts, a step is formed to adjust the lamination thickness of the metal plate by partial compressive deformation, and the seal is formed.
In order to optimize the surface pressure distribution in the portion , and furthermore, the depth of this step is made shallow in the portion where the surface pressure at the time of tightening is to be increased, and is continuously changed between the other deep portions. Unlike the case where the auxiliary plate is used, the surface pressure does not change discontinuously. Then, the槓層thickness of the metal plate in the combustion chamber hole seal portion partially tone tweezers, it is possible to obtain a sealing portion having a generally required surface pressure distribution easily.

[0008]

1 to 3 show an 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 enclosed between them. And the required number of combustion chamber holes 11 as well as necessary water holes, oil holes, etc., and further, a bolt hole 12 uniformly arranged around the combustion chamber hole 11. I have.

In the combustion chamber hole seal portion 15 provided around the combustion chamber hole 11, as shown in detail in FIGS. 2 and 3, a part of the laminated metal plate (outer plate 1) is folded back. The other metal plates (the outer plate 2 and the middle plate 3) are sandwiched between the folded portions 1a, thereby fixing the laminated metal plates as a whole.

[0010] The metal plate (middle plate 3) in the portion where the folded portion 1a contacts in the laminated metal plate is provided with:
Step 3a due to partial compression deformation by coining
Is formed. The step 3a is used to adjust the surface pressure distribution when adjusting the thickness of the metal plate, and can be formed on any of the stacked metal plates. Therefore, the fluid hole seal portion is formed thicker than the other flat portions by the difference between the thickness of the folded portion 1a and the depth of the compressed portion.

The depth of the step 3a is small at a portion where the surface pressure is required to be increased when tightening the cylinder head, such as between the adjacent combustion chamber holes 11 shown in FIG. The surface pressure is inevitably obtained as described above, or other parts that do not need to increase the surface pressure in particular are made deep, and the depth is continuously changed between these shallow parts and deep parts. I have. Generally, the surface pressure in the vicinity of the bolt hole 12 for tightening the cylinder head becomes relatively high due to the tightening force of the bolt inserted into the bolt hole 12 and tightened, and the surface pressure decreases as the distance from the bolt hole 12 increases. Therefore, as shown in FIG. 3, it is necessary to increase the depth of the step 3a in the vicinity of the bolt hole 12, and to reduce the depth of the step 3a as shown in FIG.

If the depth of the step 3a is partially changed by the compressive deformation of the metal plate by the coining process, it is possible to reduce the depth of the step 3a as compared with a case where a metal plate having a required thickness is partially laminated in advance on a portion where the surface pressure is increased. As a result, the depth of the step 3a can be continuously adjusted, and the relationship between the depth and the thickness of the plate of the turn-back portion 1a is slightly changed to reduce the overall surface pressure of the combustion chamber hole seal portion 15. Can be adjusted arbitrarily. Also,
Adjustment of surface pressure can be performed very easily as compared with a case where a metal plate having a required thickness is partially laminated in advance.

The number of metal plates to be laminated may be two or three or more. If necessary, any one of the metal plates may be provided with a bead. In the second embodiment shown in FIG. 4, a part 4a of the outer plate 4 is folded over two stacked metal plates 5 and 6 to be fastened by sandwiching the metal plates 5 and 6, thereby fixing the metal plates 5 and 6. 5 shows a case where a step 5a is formed by coining and a bead 6a is provided on a metal plate 6.

In the third embodiment shown in FIG. 5, the gasket has metal plates 8, 9 and an outer plate 7 enclosing the metal plates 8 and 9 by a folded portion 7a, and wiring is performed along the inner periphery of the combustion chamber hole. 10 shows a case where the interior is installed. In this case, due to the interior of the wiring 10, the sealing effect can be enhanced by concentrating the surface pressure at the time of fastening to that portion, but apart from that, similarly to the first embodiment, the outside made of a metal plate can be used. A step 9a is formed in the metal plate 9 by a partial compression deformation by coining at a portion where the folded portion 7a of the plate 7 contacts. It should be noted that the wiring 10 should be set to an appropriate size with an appropriate material in relation to the fluid hole seal portion in which the metal plate is laminated, in anticipation of deformation of the wiring 10 at the time of tightening.

Each step 5 in the second and third embodiments described above
Of course, the depths of a and 9a are made shallow in a portion where the surface pressure at the time of tightening the cylinder head is to be increased, and of course, continuously changed between other deep portions. Further, in the above, the seal portion 1 around the combustion chamber hole 11 is provided.
5 has been described, the same means can be used for the seal portion of the other fluid hole, or other appropriate seal means such as a bead can be used.

[0016]

As described in detail above, according to the present invention, in a metal laminated cylinder head gasket,
The lamination thickness of the metal plate in the combustion chamber hole seal portion, laminated
Folded part of the metal plate that has been placed and sandwiched another metal plate
The formed thicker than the other flat portion, impinges on enhancing the sealing effect by concentrating the surface pressure at the time of clamping the part, easy
Suitable surface pressure distribution in the sealing portion by adjusting the lamination thickness of the metal plate at the seal portion in part batchwise by easy means
Correction can be achieved, and a sealing means can be obtained in which the surface pressure does not change discontinuously due to a continuous change in the lamination thickness.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing an 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 sectional view of a main part at a position BB in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part at a position similar to FIG. 3 in the second embodiment.

FIG. 5 is an enlarged sectional view of a main part at a position similar to FIG. 3 in a third embodiment.

[Explanation of symbols]

 1, 2, 4, 7 outer plate, 1a, 4a, 7a folded part, 3 middle plate, 3a step, 5, 6, 8, 9 metal plate, 11 combustion chamber hole, 12 bolt hole, 15 combustion chamber hole seal .

Claims (2)

(57) [Scope of request for utility model registration] 1. A metal plate is formed by laminating a plurality of metal plates, and a part of the laminated metal plate in a seal portion around a combustion chamber hole is folded back to sandwich another metal plate.
In the cylinder head gasket, the lamination thickness of the metal plate in the combustion chamber hole seal portion is formed to be thicker than other flat portions, and the surface pressure when tightening is concentrated on the portion. A step for adjusting the lamination thickness of the metal plate by partial compression deformation is formed in the part where the folded part contacts, and the depth of this step is made shallow in the part where the surface pressure when tightening the cylinder head should be increased. A metal laminated cylinder head gasket, wherein the gasket is continuously changed between other deep portions. 2. The cylinder head gasket according to claim 1, wherein a step near the bolt hole for tightening the cylinder head is made deeper, and the step is made shallower as the distance from the bolt hole increases. gasket.