JPH0833178B2 - Laminated metal gasket - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a laminated metal gasket, and particularly to a laminated metal gasket, which is formed on one surface of a peripheral portion of a folded intermediate structure on the combustion chamber hole side and one surface of the intermediate structure. Second difference formed between the step and the other surface of the peripheral edge portion of the intermediate structure which is folded back and is close to the combustion chamber hole and the other surface of the intermediate structure
By providing a compensating bending part in the intermediate structure so that the steps are formed to be approximately the same, it is possible to prevent the functional deterioration of the bead of each substrate laminated on the intermediate structure, improve the sealing property, and improve the durability. TECHNICAL FIELD The present invention relates to a laminated metal gasket capable of improving the property.

[Conventional technology]

A metal gasket is used at the joint between the cylinder head and the cylinder block, which are the objects to be joined in the internal combustion engine. The metal gasket has a bead formed to seal the deck surface between the cylinder head and the cylinder block, and the bead is elastically attached to the deck surface by a fastening force of fastening means such as a fastening bolt for joining the workpieces. It forms a basic seal line and achieves a seal.

In recent years, internal combustion engines are required to be lightweight, have improved performance, are economical, and have durability. Therefore, since the internal combustion engine is used over a long engine, thermal deformation, expansion and contraction of the internal combustion engine frequently occur. Therefore, a metal gasket that seals the joint between the cylinder head and the cylinder block has been desired to be one that can withstand thermal deformation of the internal combustion engine. Therefore, the applicant of the present invention has filed an application such as Japanese Patent Application No. 60-292893 in order to improve durability. In the one described in this application, an intermediate plate and a compensating plate are laminated to form an intermediate structure, and the peripheral edge of the compensating plate on the combustion chamber hole side is folded back to form a compensating part. It is arranged on the surface of the plate and the surface of the compensator.

[Problems to be solved by the invention]

By the way, when the cylinder head is fastened to the cylinder block with the fastening bolts via the metal gasket, for example, the cylinder head is bent by the bolt fastening force, and in particular, the gap around the combustion chamber becomes large and distortion occurs.

However, in the conventional metal gasket, since the peripheral edge of the compensating plate on the combustion chamber hole side is simply folded back to the intermediate plate side to form the compensating part, the peripheral edge of the compensating plate on the combustion chamber hole side is not folded back. The function of the compensator on the bead of the substrate arranged in
In other words, the stopper does not work sufficiently, so that the bead is hit by the influence of explosive force, engine heat, etc. during use, the spring characteristics deteriorate, the sealing performance deteriorates, and the durability deteriorates. It caused inconvenience.

[Object of the Invention]

Therefore, an object of the present invention is to eliminate the above-mentioned inconvenience, and to eliminate the above-mentioned inconvenience, the first step formed on one surface of the peripheral edge portion of the intermediate structure body on the combustion chamber hole side and one surface of the intermediate structure body and the combustion chamber of the folded intermediate structure body. The intermediate structure is provided with a compensating bent portion so that the second step formed on the other surface of the hole-side peripheral portion and the second surface of the other surface of the intermediate structure are formed to be substantially the same, and thus the intermediate structure is laminated on the intermediate structure. Each of the beads on the board has the function of the compensator fully applied,
The purpose of the present invention is to realize a laminated metal gasket capable of improving the sealing property and the durability while preventing the deterioration of spring characteristics and the like by protecting each bead.

[Means for solving problems]

In order to achieve this object, the present invention provides a laminated metal sheet in which two substrates made of an elastic metal plate surrounding a combustion chamber hole and forming a bead are provided, and an intermediate structural body is interposed between the two substrates. In the gasket, the beads of the respective substrates are arranged symmetrically with respect to the intermediate structural body, and the peripheral edge of the intermediate structural body on the combustion chamber hole side is folded back to form a compensating portion having a predetermined thickness. The first step formed on the one surface of the peripheral edge of the intermediate structure on the combustion chamber hole side and the one surface of the intermediate structure, the other surface of the inner edge of the folded intermediate structure on the combustion chamber hole side, and the intermediate structure. The intermediate structure is provided with a compensating bent portion so that the second step formed on the other surface is formed to be substantially the same.

[Action]

According to the structure of the present invention, in order to compensate for the deck surface gap generated around the combustion chamber between the cylinder head and the cylinder block, the peripheral edge portion of the intermediate structure on the combustion chamber hole side is folded back to the combustion chamber hole side rather than the bead portion. A compensation portion having a large thickness is formed in the. Further, the first step portion formed on one surface of the peripheral edge portion of the folded intermediate structure on the combustion chamber hole side and one surface of the intermediate constituent body, and the other surface of the folded peripheral edge portion of the intermediate structure on the combustion chamber hole side and the intermediate constituent body. The second step portion formed on the other surface is formed substantially the same. As a result, the beads of the respective substrates laminated on the intermediate structural body are protected by the compensating portion, the deterioration of the spring characteristics and the like is prevented, the sealability is improved, and the durability is improved.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below with reference to the drawings.

1 to 3 show a first embodiment of the present invention. In the figure, reference numeral 2 denotes a laminated metal gasket. The laminated metal gasket 2 includes first and second substrates 4 and 6, an intermediate plate 10 as an intermediate component 8 interposed between the first and second substrates 4 and 6, and a compensating plate 12. . The first,
The second substrate 4 and 6 is made of an elastic metal plate of a hard, each has a thickness t _1. The intermediate plate 10 is made of a metal plate having a plate thickness t ₂ . Further, the compensation plate 12
Is made of a metal plate having a plate thickness t ₃ .

The first and second substrates 4, 6, the intermediate plate 10 and the compensating plate 12 are
Each is laminated. The first and second substrates 4 and 6, the intermediate plate 1
0, a combustion chamber hole 14 is formed in the compensation plate 12,
Around the combustion chamber hole 14, there are formed a plurality of bolt holes 16 through which fastening bolts 36, which will be described later, as fastening means are inserted.

A first bead 18 is formed on the first substrate 4 so as to surround the combustion chamber hole 14. In addition, the second substrate 6 surrounds the combustion chamber hole 14 and has a second shape that is the same shape as the first bead 18.
A bead 20 is formed.

In FIG. 2, the compensating peripheral edge portion 12e of the compensating plate 12 on the combustion chamber hole 14 side is folded back to the side where the intermediate plate 10 is located by bending or the like. As a result, the first compensation peripheral edge portion 12e-1 is superposed on the intermediate peripheral edge portion 10e of the intermediate plate 10 on the combustion chamber hole 14 side, and the second compensation peripheral edge portion 12e-2 is positioned on the second substrate 6 side. At this time, the first step h ₁ and the step generated on the surface F ₁ of the first compensator 12e-1 on the combustion chamber hole 14 side of the compensator 12 and the surface 10f of the intermediate plate 10 which is one surface of the intermediate structure 8 surface 12f of the other surface is compensating plate 12 of the combustion chamber hole 14 side of the compensating plate 12 becomes Jo second compensation periphery 12e-2 of the other surface F ₂ and the intermediate structure 8
In order to form the second step h ₂ that occurs in the first and second compensating plates 12 substantially the same, the first and second compensating bent portions 22 and the second compensating bent portion 24 are formed in the intermediate plate 10 and the compensating plate 12. As a result, one surface F ₁ of the first compensation peripheral edge portion 12e-1 on the combustion chamber hole 14 side of the compensating plate 12 is formed higher than the surface 10f of the intermediate plate 10 by the first step h ₁ and the compensating plate 12 is formed. Second compensation peripheral portion 12e of the combustion chamber 14 side of the
Other surface F ₂ -2 are formed higher by the second step h ₂ min from the surface 12f of the compensating plate 12.

Further, in the first substrate 4 on which the first beads 18 are formed, the top portion 18a of the first beads 18 is in contact with the surface 10f of the intermediate plate 10 and the base portions 18b-1 and 18b-2 are, for example, the cylinder shown in FIG. It is arranged so as to contact the deck surface 30d of the head 30. Further, in the second substrate 6 laminated on the surface 12f of the compensating plate 12, the top 20a of the second bead 20 contacts the surface 12f of the compensating plate 12 at the position where the second bead 20 is located. The base portions 20b-1 and 20b-2 are arranged so as to be in contact with each other and to be in contact with the deck surface 32d of the cylinder block 32 shown in FIG. 3, for example. That is, in the first substrate 4 and the second substrate 6, the tops 18a and 20a of the first substrate 4 and the second substrate 6 contact the surface 10f of the intermediate plate 10 and the surface 12f of the compensating plate 12, respectively.
They are arranged symmetrically with respect to 2. Therefore, around the combustion chamber hole 14 of the laminated metal gasket 2, the first
The peripheral edge portion 4e, the second peripheral edge portion 6e of the second substrate 6, the intermediate peripheral edge portion 10e of the intermediate plate 10, and the compensation plate 12 formed in a grommet shape.
The first and second compensation peripheral portions 12e-1 and 12e-2 form the compensation portion 26 having the maximum thickness. That is, the compensating portion 26 is formed closer to the combustion chamber hole 14 than the bead portion 28 where the first and second beads 18 and 20 are located. In addition, the compensation unit 26
The thickness of the first substrate 4, the second substrate 6, the intermediate plate 10 and the compensation plate
It is formed to be larger than the combined thickness of 12 and larger than the clearance of the deck surface around the combustion chamber 38 generated when the cylinder head 30 and the cylinder block 32 are fastened with the fastening bolts 36. More specifically, in the compensating unit 26, the first and second substrates 4 and 6, the intermediate plate 10, and the compensating plate of other parts are provided.
First compensating peripheral edge portion 12 of compensator 12
It is formed larger by the thickness of e-1. As a result, the gap between the deck surfaces 30d and 32d around the combustion chamber 38 is reliably compensated.

The first substrate 4, the second substrate 6, the intermediate plate 10, and the compensator 12
When they are integrally coupled with each other, for example, a hollow cylindrical stopper (not shown) is inserted into the bolt hole 16 and both ends of the stopper are folded on the surfaces of the first substrate 4 and the second substrate 6. Formed by bending and caulking, or by projecting a part of the outer edge portion of the first substrate 4, the second substrate 6, the intermediate plate 10, and the compensation plate 12,
These protruding parts are spot welded or riveted.

In FIG. 3, reference numerals 30 and 32 denote a cylinder head and a cylinder block which constitute an internal combustion engine, and a deck surface 30d of the cylinder head 30 and a deck surface 32d of the cylinder block 32.
The laminated metal gasket 2 of the present invention is interposed in the joint portion 34 between them, and is fastened by fastening bolts 36. Reference numeral 38 is a combustion chamber.

 Next, the operation of the first embodiment will be described.

Bead 1 of the first substrate 4 on the deck surface 30d of the Sirida head 30
The bases 18b-1 and 18b-2 of 8 come into contact with each other, and the second bead 2 of the second substrate 6 is attached to the deck surface 32d of the cylinder block 32.
The laminated metal gasket 2 abutted by the base portions 20b-1 and 20b-2 of 0 and interposed in the joint portion 34 is compressed by the fastening force of the fastening bolt 36, whereby the first and second beads 18 and 20 are provided. Is reduced in height and is deformed by compression. At this time, the first and second
Beads 18 and 20 is reduced progressively height by a fastening force of the fastening bolt 36, together with the first peripheral portion 4e of the first substrate 4 is brought into contact with one surface F ₁ of the first compensation periphery 12e-1, the second peripheral portion 6e of the second substrate 6 is the pressed pressed prevented by abutting the other surface F ₂ of the second compensation periphery 12e-2, i.e. is pressed deformation suppression does not become flat.

When the fastening bolts 36 are further tightened, the cylinder head 30 is distorted due to insufficient rigidity of the internal combustion engine against the bolt fastening force, and the gap between the deck surfaces around the combustion chamber 38 becomes particularly large. is there. However, as described above, since the compensating portion 26 is formed on the combustion chamber hole 14 side with respect to the bead portion 28, the thickness of the compensating portion 26 reliably compensates for a large gap due to the distortion of the cylinder head 30. can do. Further, at this time, the laminated metal gasket 2 is compressed and the thickness of the compensating portion 26 is slightly reduced from the thickness before being tightened.

Then, the first and second beads 18 and 20 are ensured to have an evenly deformed state by the first and second compensation peripheral edge portions 12e-1 and 12e-2 protruding at substantially the same height, and the first and second beads are formed. It avoids hitting 18 and 20 and prevents deterioration of spring characteristics and the like. As a result, it becomes possible to efficiently prevent the leakage of the combustion gas from the combustion chamber 38. In addition, the compensator 26 prevents expansion and contraction of the deck surface due to the influence of combustion gas pressure and engine heat, and the first and second beads 18, 26
The compensating portion 26 weakens the alternating load due to the hitting or the like that acts on the first and second beads 18 and 20, and effectively prevents the sagging of the first and second beads 18 and 20. Then, the fastening bolt 36 and the portion of the cylinder head 30 with which the fastening bolt 36 engages can be prevented from being damaged, and the fastening force of the fastening bolt 36 can be prevented from being reduced to obtain a stable sealing effect.

Further, according to this embodiment, since the first and second beads 18 and 20 of the first and second substrates 4 and 6 are arranged symmetrically with respect to the intermediate plate 10 and the compensating plate 12, the bead portion 28 The amount of restoration and the restoring force of the beads are increased, and the sealing effect of the bead portion 28 is improved. Therefore, around the combustion chamber 38, the compensating part 26 and the bead part 28
Since it is sealed at two places, the higher sealing effect can be obtained and the leakage of combustion gas can be efficiently prevented.

Furthermore, when changing the thickness of the compensator 26, the intermediate plate
Since it is only necessary to change the plate thickness of the compensation peripheral edge portion 12e of the compensation plate 12 or the compensation plate 12, the thickness can be easily changed, and the laminated metal gasket 2 can be easily manufactured.

FIG. 4 shows a second embodiment of the present invention.
In the following embodiments, portions having the same functions as those in the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, the compensation plate 12 having a thickness t _3, the intermediate plate 42 are stacked with small consisting plate thickness t ₄ than the thickness t ₃ of the compensation plate 12. The intermediate plate 42 and the compensating plate 12 form an intermediate structural body 44. Further, the compensation peripheral edge portion 12e of the compensating plate 12 on the combustion chamber hole 14 side is folded back to the surface side where the intermediate plate 42 is laminated by bending or the like, and does not overlap with the intermediate peripheral edge portion 42e of the intermediate plate 42, That is, the end surface is arranged so as to be separated from the end surface of the intermediate peripheral edge portion 42e of the intermediate plate 42 on the combustion chamber hole 12 side by a predetermined distance C ₁ .
Furthermore, the surface 42f of the intermediate plate 42, which is one surface of the intermediate structure 44,
One face F ₃ of the first compensation peripheral portion 12e-1 of the compensating plate 12 folded back to
Occurs on the first step h ₃ generated on the surface of the intermediate plate 44, on the surface 12f of the compensator 12 which is the other surface of the intermediate structure 44, and on the other surface F ₄ of the second compensating peripheral part 12e-2 of the stepped compensator 12. A compensating bent portion 46 is formed on the compensating plate 12 so that the second step h ₄ is substantially the same.

According to the configuration of the second embodiment, the same effect as that of the first embodiment described above is obtained, and the thickness of the bead portion 28 and the compensating portion 26 of the laminated metal gasket 2 is set to the thickness t _{4 of the} intermediate plate 42. and/
Alternatively, it can be changed by changing the plate thickness t ₃ of the compensating plate 12, and the sealing surface pressure acting on the deck surfaces 30d, 32d can be easily changed and set as desired by the thickness of the compensating portion 26. it can. In addition, the compensating bent portion 46
It can be easily manufactured because it only has to be formed in 12.

 FIG. 5 shows a third embodiment of the present invention.

The features of the third embodiment are as follows. That is, the first intermediate plate 52 having a plate thickness t ₅ is laminated on the compensating plate 12 having a plate thickness t _3, and the second intermediate plate 54 having a plate thickness t ₆ is laminated on the first intermediate plate 52 to form an intermediate plate. The construct 56 is constructed. In addition, the compensation peripheral edge portion 12e of the compensating plate 12 on the combustion chamber hole 14 side
Is folded back toward the first and second intermediate plates 52, 54,
54 does not overlap with the first intermediate peripheral edge portion 54e, that is, the end surface is a predetermined distance C _{2 from} the end surface of the second intermediate peripheral edge portion 54e of the second intermediate plate 54.
And the first compensation peripheral edge portion 12e.
-1 is overlapped with and disposed on the first intermediate peripheral edge portion 52e of the first intermediate plate 52. Further, the first step h ₅ generated on the surface 54f of the second intermediate plate 54, which is one surface of the intermediate structural body 56, and the one surface F ₅ of the first compensation peripheral edge portion 12e-1 of the compensation plate 12, and the intermediate structural body 56 The surface 12f of the compensating plate 12 which is the other surface and the second compensating peripheral edge portion 12e− of the compensating plate 12
The compensating plate 12 and the first intermediate plate 52 have the compensating bent portion 58 and the first compensating bent portion 58 so that the second step h ₆ generated on the other surface F ₆ of the second member is substantially the same.
An intermediate compensating bent portion 60 is formed.

In addition, the compensating plate 12, the first intermediate plate 52, the second intermediate plate 54
Is made of a softer material than the first and second substrates 4 and 6.

According to the configuration of the third embodiment, the same effect as that of the above-described first embodiment is obtained, and the first and second substrates 4 and 6 are provided with the first and second substrates.
Since the tops 18a and 20a of the beads 18 and 20 contact the second intermediate plate 54 and the compensating plate 12 made of a soft material, it is possible to prevent the tops 18a and 20a from being worn, and the first and second beads 18 and 20 can be avoided. Can be protected and the service life can be extended.

 FIG. 6 shows a fourth embodiment of the present invention.

The features of the fourth embodiment are as follows. That is, the intermediate structural body 72 is composed of the single compensating plate 12 having the plate thickness t ₃ . Further, the compensating peripheral portion 12e of the compensating plate 12 on the combustion chamber hole 14 side is folded back to form the compensating portion 26, and at the same time, the one surface 12f-1 of the compensating plate 12 which is one surface of the intermediate structural body 72 and the first compensating member. the occurring one surface F ₇ of the peripheral edge portion 12e-1 1 step h ₇ and other surfaces 12f-2 of the compensator 12 is another surface of the intermediate structure 72 and the second compensation periphery 12e-2 of the other surface F ₈ A compensating bent portion 74 is formed on the compensating plate 12 so that the second step h ₈ generated at the same is substantially the same.

According to the structure of the fourth embodiment, the same effect as that of the first embodiment can be obtained, and the intermediate structural body 72 is composed of one compensating plate 12, so that the structure of the laminated metal gasket 2 can be simplified.

The present invention is not limited to the above-mentioned embodiments, and it is needless to say that various application modifications can be made.

For example, in the above-described first to fourth embodiments, the first and second
It is also possible to apply plating, thermal spraying, coating, or the like, or to provide a member such as a metal or a heat-resistant resin at each peripheral portion of the substrate in order to adjust the thickness of the compensation portion.

Further, it is possible to fix the compensating member to the thickness of the bent compensating peripheral portion of the compensating plate on the deck surface of the cylinder head or the cylinder block, or to interpose the compensating member between the deck surface and the substrate. is there.

Further, the thickness of the bent compensating peripheral edge portion of the compensating plate may not be formed entirely around the combustion chamber but may be partially provided around the combustion chamber as desired. Thereby, for example, a point contact is made at the bolt fastening portion, and a line contact is made at a portion separated from the bolt fastening portion, so that the sealing property can be secured.

Further, the thickness of the bent compensating peripheral portion of the compensating plate is reduced, for example, at a bolt fastening portion, while the thickness is increased at a portion away from the bolt fastening portion, thereby achieving uniform sealing surface pressure and improving sealing performance. It is also possible to improve.

Further, it is possible to apply a plating layer or a sealing material for compensating irregular surfaces such as tool marks on the deck surface to the front and back surfaces of the laminated metal gasket, that is, the front surface of the first substrate and the front surface of the second substrate.

Further, the width and height of the first and second beads can be changed according to the deck surface gap.

Furthermore, in order to adjust the height of the compensating portion, it is possible to change the plate thickness of the intermediate component, that is, the compensating plate or the peripheral portion of the intermediate plate on the combustion chamber hole side, as desired.

〔The invention's effect〕

As is clear from the above detailed description, according to the present invention, the first step formed on the one surface of the peripheral portion of the folded intermediate component on the combustion chamber hole side and the one surface of the intermediate component and the combustion of the folded intermediate component. By forming the second step formed on the other surface of the peripheral portion of the chamber hole and the other surface of the intermediate structural body to be substantially the same, the function of the compensating section for the beads of the substrates disposed on both surfaces of the intermediate structural body, respectively. Can be sufficiently acted to prevent the beads from being hit by the explosive force and the like, and prevent the deterioration of the spring characteristics and the like to improve the sealing property and the durability.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a plan view of a laminated metal gasket, FIG. 2 is an enlarged sectional view of a main part taken along line II-II of FIG. 1, and FIG. It is principal part sectional drawing in which the laminated metal gasket was partly abbreviate | omitted in the state interposed in the joining part. FIG. 4 shows a second embodiment of the present invention and is an enlarged cross-sectional view of a main part of a laminated metal gasket. FIG. 5 shows a third embodiment of the present invention and is an enlarged sectional view of a main part of a laminated metal gasket. FIG. 6 shows a fourth embodiment of the present invention and is an enlarged cross-sectional view of a main part of a laminated metal gasket. In the figure, 2 is a laminated metal gasket, 4 is a first substrate,
6 is a second substrate, 8 is an intermediate structure, 10 is an intermediate plate, 12 is a compensating plate, 14 is a combustion chamber hole, 18 is a first bead, 20 is a second bead,
22 is a first compensation bent portion, 24 is a second compensation bent portion, 26 is a compensation portion, 28 is a bead portion, 30 is a cylinder head, 32 is a cylinder block, 34 is a joint portion, and 36 is a fastening bolt. , And
38 is a combustion chamber.

Claims (1)

[Claims] 1. A laminated metal gasket in which two substrates made of an elastic metal plate that surrounds a combustion chamber hole and form a bead are provided, and an intermediate component is interposed between the two substrates. Are arranged symmetrically with respect to the intermediate structure, and the peripheral edge portion of the intermediate structure on the combustion chamber hole side is folded back to form a compensating portion having a predetermined thickness, and combustion of the folded back intermediate structure is performed. A first step formed on one surface of the chamber-hole-side peripheral portion and one surface of the intermediate component, and a first step formed on the other surface of the folded chamber-side peripheral portion of the intermediate component and the other surface of the intermediate component. A laminated metal gasket, characterized in that the intermediate structure is provided with a compensating bent portion so that the two steps are formed substantially the same.