JP3113647B2 - Metal laminated 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 suitable as a cylinder head gasket interposed between a cylinder head and a cylinder block of an internal combustion engine.

[0002]

2. Description of the Related Art In a metal-laminated gasket formed by laminating a plurality of metal plates and having a plurality of combustion chamber holes corresponding to the combustion chambers of a cylinder block, a sealing portion around the combustion chamber holes is provided. Adjust the lamination thickness of the metal plate to make it thicker than the other flat parts, and turn back one outer layer metal plate at the edge of each combustion chamber hole to concentrate the surface pressure when tightening to that part And the like have been widely used. However, in the above gasket, in order to prevent cracks or the like at the folded portion, the outer metal plate to be folded cannot be thinned to a predetermined thickness or less. Is limited, as a result, the thickness of the laminated metal plate of the gasket becomes correlated, and it becomes necessary to set the plate thickness of each metal plate severely, and furthermore, it is necessary to fold the outer metal plate. There is a problem that the process is troublesome.

On the other hand, as a gasket used in an internal combustion engine of the same type, a step (thickness difference) between a seal portion around a combustion chamber hole and another flat portion is kept constant while the entire metal plate is kept. Gaskets of various grades with different lamination thicknesses are required for adjustment during assembly of the internal combustion engine.
When trying to manufacture gaskets of such various grades, in a gasket in which a plurality of metal plates are laminated, the overall lamination thickness of the metal plate is determined by a combination of metal plates in which a plurality of thicknesses are severely set. The adjustment is
It is disadvantageous in terms of reduction of manufacturing cost.

[0004]

The technical problem of the present invention is to provide a metal laminated gasket formed by laminating a plurality of metal plates and having a combustion chamber hole corresponding to a combustion chamber of a cylinder block. A plate for forming a step between the seal portion and another flat portion without adjusting the overall thickness of the laminate and the thickness of the seal portion without depending on the mutual relationship of the thicknesses of the plurality of laminated metal plates. Provided is a metal-laminated gasket in which the thickness of each plate can be appropriately set, except that the thickness is provided and the total thickness is obtained as the sum of the thickness of each plate. Is to do. Another technical object of the present invention is to provide a metal-laminated gasket that facilitates positioning of a ring plate for adjusting a thickness provided in a seal portion around a combustion chamber hole by using a bead. Still another technical object of the present invention is to provide a metal-laminated gasket capable of reducing stress concentration in the vicinity of a bolt hole around a combustion chamber hole.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a metal laminated type formed by laminating a plurality of metal plates and having a combustion chamber hole corresponding to a combustion chamber of a cylinder block. In the gasket, a ring plate surrounding the hole edge of the combustion chamber hole is laminated on the first metal plate in the gasket, and a bead is provided on the first metal plate or the ring plate in the laminated portion,
On the side of the metal plate where the ring plate is laminated,
A second metal plate thinner than the ring plate is laminated so as not to overlap the ring plate.

In a more specific configuration of the metal-laminated gasket of the present invention, a bead having a top portion abutting on the first metal plate can be provided at a position near the ring plate on the second metal plate. The first metal plate may be provided with a bead positioned around the ring plate and also serving as a positioning of the ring plate. Further, the width of the ring plate in the vicinity of the bolt hole around the combustion chamber hole may be reduced. It is appropriate to make it wider than the width between the bolt holes.

The metal-laminated gasket of the present invention having the above-described structure is formed by laminating a plurality of metal plates, and is a metal-laminated gasket having a combustion chamber hole corresponding to a combustion chamber of a cylinder block. It is possible to simply set the required thickness without depending on the mutual relationship between the thicknesses of the plurality of laminated metal plates, without having to adjust the actual lamination thickness and the thickness of the seal portion.

In the above gasket, the first metal plate is provided with a bead located around the ring plate, so that the ring plate can be easily positioned. By increasing the pressure receiving area by making the width of the ring plate near the hole larger than the width between the bolt holes, it is possible to alleviate stress concentration at the portion and reduce bore deformation and the like caused by the stress concentration.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a metal-laminated gasket according to an embodiment of the present invention; FIG. This shows a case where the present invention is applied to a cylinder head gasket interposed between a block and a block.

As shown in FIGS. 1 and 2, the metal-laminated gasket 1 is dispersed around the combustion chamber holes 7 corresponding to the combustion chambers of the cylinder block and around the holes 7, and is tightened with tightening bolts. And a fluid hole 11 such as a required number of water holes and oil holes for surrounding the hole edge of the combustion chamber hole 7 in the first metal plate 3 constituting the gasket 1. While the ring plate 4 is laminated, a second metal plate 5 thinner than the ring plate 4 is provided on the surface of the metal plate 3 on the side where the ring plate 4 is laminated.
The gasket step (t ₄ −t ₅ ) is formed between the ring plate 4 and the second metal plate 5 by laminating the ring plate 4 so as not to overlap with the ring plate 4. Is formed to be thicker than other flat portions so that surface pressure is concentrated on the portion when tightening with a tightening bolt (not shown). The top of the ring plate 4 is the first
A bead 4a for increasing the sealing surface pressure in contact with the metal plate 3 is provided along the periphery of the combustion chamber hole 7, and the bead 4 in the ring plate 4 is provided on the metal plate 3.
There is provided a bead 3a which is in contact with the outer periphery of the seal member a to increase the sealing surface pressure. It is not necessary to provide both the bead 4a and the bead 3a, and only one of them can be provided.

[0011] The gasket 1 maintains the thickness of the first metal plate 3 at a constant value, and maintains the difference between the thicknesses of the ring plate 4 and the second metal plate 5 at a constant value. The thickness of the first metal plate 3 and the ring plate 4 is changed by changing the thickness of the first metal plate 3 and the second metal plate 5.
The gasket group of various grades in which the step between the metal plate 3 and the laminated portion of the second metal plate 5 is constant and the total thickness T is different can be formed.

Further, a bolt hole 9 around the combustion chamber hole 7 is provided.
The width W ₁ of the ring plate 4 in the vicinity of, but are wider than the width W ₂ between bolt holes 9, 9, whereby the stress concentration by increasing the pressure receiving area to receive the bolt clamping force in the portion Thus, it is possible to reduce bore deformation and the like resulting from the relaxation. However, the width of the ring plate 4 may be constant throughout.

A metal-laminated gasket 1 having the above structure
In the above, the plate thickness of the first metal plate 3 is kept constant, and the difference between the plate thickness of the ring plate 4 and the plate thickness of the second metal plate 5 is kept constant. The step between the other flat portions can be set to a desired value, and the thickness of the first metal plate 3 can be adjusted by adjusting the thicknesses of the ring plate 4 and the second metal plate 5. Regardless of the thickness, the overall thickness T of the gasket 1 can be simply set to a required thickness while keeping the gasket step (t ₄ −t ₅ ) constant.

By providing the bead 3a on the first metal plate 3 at the outer periphery of the bead 4a of the ring plate 4, not only the effect of the bead can be doubled but also the positioning of the ring plate 4 can be facilitated. The width W ₁ of the ring plate 4 in the vicinity of the bolt hole 9 around the combustion chamber hole 7 is made larger than the width W ₂ between the bolt holes 9, 9 to increase the pressure receiving area. Thereby, stress concentration in the portion can be reduced, and bore deformation and the like due to the concentration can be reduced.

In the above embodiment, the case where the ring plate 4 and the second metal plate 5 are laminated on the first metal plate 3 has been described. However, the present invention is not limited to this. A third metal plate having an appropriate thickness can be laminated on the side of the metal plate 3 or on the side on which the ring plate 4 and the second metal plate 5 are laminated. Further, the ring plate 4 can be fixed to the first metal plate 3 or the third laminated metal plate laminated on the ring plate by welding or the like.

FIG. 3 shows another embodiment of the present invention.
In this embodiment, a bead 4a similar to that of the above embodiment is provided on the ring plate 4 in this embodiment, but the first metal plate 3 is provided on the outer side of the laminated portion of the ring plate 4. , A bead 3 b whose top abuts on the outer edge of the ring plate 4 is provided. This bead 3b
Are effective not only for the function of the bead but also for the positioning of the ring plate 4. Since the other configurations and operations of this embodiment are the same as those of the previous embodiment, the same or corresponding parts are denoted by the same reference characters and description thereof will be omitted.

FIG. 4 is an end view of another embodiment of the present invention at the same position as that of FIG. 2. The gasket of this embodiment includes a bead 13 a facing a bead 3 b of the first metal plate 3. The provided third metal plate 13 is laminated. With this configuration, the beads 3b, 13
The surface pressure at the portion a can be further increased, and the sealing performance can be improved. Since the other configurations and operations of this embodiment are the same as those of the previous embodiment, the same or corresponding parts are denoted by the same reference characters and description thereof will be omitted.

[0018]

As described above in detail, according to the metal-laminated gasket of the present invention, the gasket is formed by laminating a plurality of metal plates and has a combustion chamber hole corresponding to the combustion chamber of the cylinder block. In the metal-laminated gasket, the adjustment of the overall lamination thickness and the thickness of the seal portion is performed independently of the mutual relationship between the thicknesses of the plurality of laminated metal plates, and between the seal portion and other flat portions. The thickness of each plate can be set as appropriate, except for the provision of a plate thickness for forming a step and the natural limitation of obtaining the total thickness as the sum of the thickness of each plate. Further, by providing beads on the first metal plate at positions around the ring plate, the ring plate can be easily positioned, and a bead near the bolt hole around the combustion chamber hole can be obtained. By increasing the pressure receiving area by making the width of the ring plate larger than the width between the bolt holes, it is possible to alleviate stress concentration at the portion and reduce bore deformation and the like caused by the stress concentration.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view showing an embodiment of a metal-laminated gasket of the present invention.

FIG. 2 is an enlarged end view taken along line AA of FIG.

FIG. 3 is an enlarged end view of another embodiment of the present invention at a position similar to FIG. 2;

FIG. 4 is an enlarged end view of another embodiment of the present invention at the same position as in FIG. 2;

[Explanation of symbols]

1 metal laminate type gasket 3 first metal plate 3a, 3b bead 4 ring plate 4a bead 5 the second metal plate 7 a combustion chamber holes 9 bolt hole W _1, W ₂ Width

Claims (4)

(57) [Claims] 1. A metal laminated gasket formed by laminating a plurality of metal plates and having a combustion chamber hole corresponding to a combustion chamber of a cylinder block. A ring plate surrounding the hole edge of the chamber hole is laminated, a bead is provided on the first metal plate or the ring plate in the laminated portion, and the ring on the side of the first metal plate on which the ring plate is laminated is attached to the ring plate. A metal-laminated gasket, wherein a second metal plate thinner than a plate is laminated so as not to overlap the ring plate. 2. The gasket according to claim 1, wherein a bead whose top portion is in contact with the first metal plate is provided at a position of the second metal plate close to the ring plate. Metal laminated gasket. 3. The metal-laminated gasket according to claim 1, wherein a bead is provided on the first metal plate and located around the ring plate and also serves to position the ring plate. Metal laminated gasket. 4. The laminated gasket according to claim 1, wherein the width of the ring plate near the bolt holes around the combustion chamber hole is wider than the width between the bolt holes. Characterized metal laminated gasket.