JPH0685964U - Laminated metal plate gasket - Google Patents

Abstract

(57) [Abstract] [Purpose] In a gasket in which beads surrounding a plurality of combustion chamber openings are united between adjacent openings with a narrow space to form a single common bead, the common beads are reinforced to form adjacent openings. In addition to enhancing the sealing property between the openings, the same effect as that in which the bead between the adjacent openings is less likely to settle is produced. A bead plate 7 and 8 in which beads 5 surrounding a plurality of combustion chamber openings 2 are united to form a single common bead 50 between adjacent narrow openings, and only between the adjacent openings, In addition, it is configured by laminating an intermediate plate 10 provided with beads 6 so as not to cross the beads 5 of the bead plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated metal plate gasket used for an engine cylinder head gasket.

[0002]

[Background of device]

 In recent years, as engines have become smaller and higher in performance, the spacing between cylinders, ie, combustion chambers, of multi-cylinder engines has become narrower. For this reason, in the cylinder head gasket as well, the bead surrounding each combustion chamber opening in an annular shape cannot be taken independently between the adjacent combustion chamber openings, and two adjacent annular bead shapes are used. Are often formed as a common bead that is integrated into one line.

In the metal gasket in which the common bead is formed between the combustion chamber openings as described above, the number of beads is reduced between the combustion chamber openings. When the bolts are mounted in between and tightened with bolts, the number of seal lines due to the beads between the openings of the combustion chambers on the mating surfaces decreases, and it is unavoidable that the sealing performance deteriorates.

Further, the heat load of the adjacent combustion chambers is applied between the openings for the combustion chambers of the gasket, and the thermal conditions are the most severe. Especially, when the interval between the combustion chambers is narrow, the combustion chambers of the engine itself. The temperature rises greatly between the openings, and the conditions become more severe. For this reason, the beads between the combustion chamber openings of the gasket are generally prone to fatigue, but when the common beads are formed as described above, the number of beads is reduced, so that the engine The load applied to the common bead due to the vertical vibration of the head due to the pressure in the combustion chamber increases as the number of beads decreases, and the common bead becomes even more prone to fatigue.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to reinforce the common bead between the combustion chamber openings of the gasket to enhance the sealing performance between the openings and to improve the combustion chamber. The aim is to obtain the same result as when the bead between the openings is less likely to sag.

[0006]

[Constitution of device]

 The laminated metal plate gasket of the present invention which achieves the above object has a bead surrounding each of the plurality of combustion chamber openings and surrounding the openings, and the bead is provided between adjacent combustion chamber openings. A bead plate formed on the common bead; and an intermediate plate having a bead only between adjacent combustion chamber openings, the bead plate being formed so as not to cross the bead of the bead plate. It is characterized by being present.

[0007]

【Example】

 The details of the present invention will be described below with reference to the drawings of the embodiments. 1 is a plan view of a gasket of an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. FIG. 4 is a plan view of the intermediate plate in the example. FIG. 5 is a sectional view similar to FIG. 2 showing another embodiment of the present invention. In each figure, the same reference numerals indicate the same parts.

In the drawing, reference numeral 1 is a cylinder head gasket using a laminated metal plate gasket of the present invention, which includes a plurality of combustion chamber openings 2, liquid passage holes 3 such as cooling water passage holes and oil passage holes, and bolt insertion holes. And a general hole 4. In the embodiment shown in FIGS. 1 to 4, the gasket 1 is formed by laminating a bead plate 7, a compensating plate 9, an intermediate plate 10 and a bead plate 8 in this order from the upper cylinder head side.

As shown in FIG. 1, the upper and lower bead plates 7 and 8 made of an elastic metal plate such as a stainless steel plate are convex so as to surround the combustion chamber opening 2 and surround them, respectively. A bead 5 is provided, and the bead seals the combustion chamber opening 2, but the space between the adjacent combustion chamber openings 2 and 2 is small, and the two beads 5 and 5 are individually separated. Since it is difficult to provide the two beads 5, 5, the single bead 50 is formed by combining the two beads 5.

Similarly, the intermediate plate 10 made of an elastic metal plate such as a stainless steel plate is provided with the beads 6 only between the adjacent combustion chamber openings 2, 2 as shown in the plan view of FIG. The bead 6 is a convex bead that extends so as to overlap the common bead 50 of the bead plates 7 and 8, and is opposed to the common bead 50 of the bead plate 7 via a compensating plate 9 described later. . The bead 6 corresponds to the contact points 51, 51 of the double bead 5, 5 and the common bead 50 so that the bead 6 does not cross the bead 5, 5 of the bead plates 7 and 8. It is made slightly shorter than the length of the common bead 50 so that it does not extend beyond its position.

The compensating plate 9 is made of a metal plate that is softer than a bead plate such as a blunt material such as an iron plate or a stainless steel plate. As shown in FIG. 2, a folded portion 90 is formed at the periphery of the combustion chamber opening 2. There is. The folded-back portion 90 is located closer to the combustion chamber opening 2 than the beads 5 and 50, seals the opening, and occurs at the periphery of the combustion chamber opening when the cylinder head is fastened to the cylinder block with a bolt. It functions as a compensator that compensates for the gap.

In the above-described embodiment, the convex plate 6 extending only between the combustion chamber openings 2 and 2 is provided on the intermediate plate 10 which is conventionally not provided with beads, and the bead plates 7 and 8 are connected to each other. Since it is provided so as to overlap the bead 50, the common bead 50 is reinforced by the bead 6 and its elastic restoring force is enhanced. Therefore, when the gasket is mounted between the joining surfaces of the cylinder block and the head and the bolts are fastened, the line pressure of the seal line by the common bead 50 is increased, and the sealing property between the combustion chamber openings is improved.

Further, between the combustion chamber openings 2 and 2, the beads as springs are laminated in a three-stage series, and the bead is laminated one stage more as compared with other parts of the gasket. Even though some beading may occur between the openings in the combustion chamber under severe conditions, the overall bead of three stages is still much better than the two-tiered bead in other parts of the gasket. A sufficient residual bead height can be secured. That is, it is possible to obtain the same result as that the bead between the combustion chamber openings 2 and 2 is unlikely to cause a settling.

In the present invention, the bead 6 provided on the intermediate plate as a bead that reinforces the bead provided on the bead plate is provided only between the combustion chamber openings 2 and 2, so that the bead for reinforcement is provided. The increase in the load consumption of the bolt tightening torque due to the provision of No. 6 is suppressed to a minimum, and therefore the influence on the surface pressure distribution of the entire gasket is small.

In the present invention, the bead 6 is provided slightly shorter than the length of the common bead 50 so that the bead 6 does not cross the bead 5 of the bead plates 7 and 8 as described above. This is to prevent the line from being damaged. If the bead 6 is formed so as to extend across the bead 5 of the bead plate, the sealing property of the seal line by the bead 5 will be improved when the gasket is mounted between the joining surfaces of the cylinder block and the head. If it is damaged, for example, the cooling water of the water jacket of the cylinder block will invade along the bead 6 between the openings of the combustion chambers.

In another embodiment of the invention, shown in cross section in FIG. 5, the gasket 1 comprises two layers of intermediate plates with reinforcing beads 6 only between the combustion chamber openings 2, 2. The gasket 1 has five layers of metal plates stacked in this order from the upper cylinder head side, a bead plate 7, an intermediate plate 11, a compensating plate 9, an intermediate plate 10, and a bead plate 8. The configurations of the bead plates 7 and 8, the intermediate plates 10 and 11, and the compensating plate 9 are the same as those already described above. In addition, in FIG. 4, the protruding direction of the common bead 50 of the bead plates 7 and 8 and the protruding direction of the bead 6 of the intermediate plates 10 and 11 are set to face each other via the compensating plate 9. However, conversely, they may be arranged so as to be back-to-back with respect to the compensating plate 9.

The above-described embodiment of the present invention can be modified in various ways. The compensating plate 9 shown in the above embodiment may be omitted, or an intermediate plate having no bead 6 may be added to the structure of the above embodiment. Further, a grommet may be provided on the periphery of the combustion chamber opening in the bead plates 7 and 8 or the intermediate plates 10 and 11. Although not shown in FIG. 1, the bead plates 7 and 8 surround, for example, a liquid passage hole 3 or a group thereof in addition to the bead 5 and the common bead 50 which surround the combustion chamber opening 2. Providing a bead, a bead, etc. extending substantially along the outer edge of the gasket is a common practice in metal plate gaskets, and in the present invention, these are necessary and can be preferably adopted. is there.

[0018]

[Effect of device]

 According to the laminated metal plate gasket of the present invention having the above-described structure and operation, the bead provided on the bead plate so as to surround the combustion chamber opening has a single common bead between the combustion chamber openings having a narrow interval. The common bead is reinforced by the bead provided on the intermediate plate to improve the sealing performance between the combustion chamber openings, although the common bead is formed.

Further, between the openings for the combustion chamber, since the beads are laminated in multiple stages as compared with the other parts of the gasket, as described above, it is possible to obtain the same result as that the fatigue does not easily occur. You can Moreover, in the present invention, since the reinforcing bead provided on the intermediate plate is disposed only between the openings for the combustion chamber, the bolt tightening torque consumed by the reinforcing bead is small and the influence on the surface pressure distribution of the gasket is small. In recent years, the present invention has a great practical effect in view of the tendency that the space between the combustion chamber openings of an engine is narrowed.

[Brief description of drawings]

FIG. 1 is a plan view of a gasket according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of an intermediate plate in the above embodiment.

FIG. 5 is a sectional view similar to FIG. 2, showing another embodiment of the present invention.

[Explanation of symbols]

 2 Combustion chamber opening 3 Liquid passage hole 5 Bead 50 Common bead 6 Bead 7 and 8 Bead plate 9 Compensation plate 10 and 11 Intermediate plate

Claims (1)

[Scope of utility model registration request] 1. A bead plate having beads surrounding each of a plurality of combustion chamber openings, the beads surrounding the openings, and a bead plate formed between the adjacent combustion chamber openings to form a common bead. A laminated metal plate gasket having a bead only between adjacent combustion chamber openings, and an intermediate plate formed so that the bead does not cross the bead of the bead plate. .