JPH08200503A - Metal gasket - Google Patents

Abstract

PURPOSE: To provide a metal gasket where no positional deviation, separation or cracking is generated by forming recessed grooves of the closed loop to surround openings to be sealed in the surface of a metallic sheet, and providing sealing materials made of a synthetic resin in these recessed grooves so as to be projected from the recessed groove. CONSTITUTION: Recessed grooves 11-13 of the closed loop are provided in a metallic sheet 1 so as to surround a combustion chamber hole 2, a water hole 4 and an oil hole 5 to be sealed, and sealing materials 14-16 made of synthetic resin are projectingly provided from the recessed grooves 11-13 to allow the press fitting to the adhesion surface of a part 8 to be joined forming a continuous seal line surrounding the respective holes 2, 4, 5. Base parts 14a-16a adhered to the metallic sheet 1 of the sealing materials 14-16 are located within the recessed grooves 11-13, and locked to the recessed grooves 11-13 even when the external force due to the positional deviation in the width direction is applied. Even when the sealing materials 14-16 are compressed, and the surface of the metallic sheet 1 is closely in contact with the surface to be joined, the sealing materials 14-16 are not compressed over the depth of the recessed grooves 11-13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket mainly used for sealing a joint portion of an internal combustion engine, and more particularly to a metal gasket using a sealing material made of synthetic resin in a portion requiring sealing. is there.

[0002]

2. Description of the Related Art Conventionally, there is a gasket which uses a soft material such as aramid or carbon as a base material and uses a sealing material made of a synthetic resin in a portion requiring sealing. In this product, a synthetic resin having good heat resistance, oil resistance and pressure resistance is added as a surface treatment liquid to the surface of a base material made of aramid, carbon or the like so that the necessary sealing effect can be obtained.

[0003]

In the above-mentioned conventional gasket, when the joint portion is fastened, the synthetic resin layer added as the surface treatment liquid sometimes causes misalignment, peeling, cracking and the like. is there.

However, the base material made of a soft material such as aramid and carbon has the same compression and restoration characteristics as the synthetic resin material, and this causes the synthetic resin layer to be displaced and peeled off due to the sealing of the joint portion. Since it complements cracks and cracks to some extent, there is no particular problem.

By the way, it is desired that the gasket be made of metal because of the recent tendency of thinning and hardening. In order to respond to this, the present inventors considered using a synthetic resin material having good heat resistance, oil resistance, and pressure resistance as described above for the seal portion of the metal gasket.

However, when the synthetic resin sealing material is provided on the surface of the metal plate, the position of the synthetic resin sealing material is displaced, peeled, and peeled by the fastening of the joint portion more than in the case of the conventional gasket using the soft base material. Since cracks occur and the metal plate does not have compressive or restoring properties, it is not possible to compensate for misalignment, peeling, and cracking of the synthetic resin sealing material on the seal of the joint, resulting in early seal leakage. Occurs and the life is shortened. An object of the present invention is to solve such a problem, and to provide a metal gasket using a sealing material made of a synthetic resin in a portion where sealing is required and in which displacement, peeling, and cracking do not occur. That is the purpose.

[0007]

In order to achieve the above-mentioned object, the metal gasket of the present invention has a closed-loop concave groove surrounding a required opening for sealing a metal plate, formed on the surface of the metal plate. The main feature is that a sealing material made of synthetic resin is provided in the groove so as to protrude from the groove.

It is preferable that a play is provided between the inner peripheral surface of the groove and the sealing material, and in this case, the inner peripheral surface of the groove should be inclined outward toward the upper side. You can

[0009]

According to the above-mentioned structure, which is the main feature of the metal gasket of the present invention, the concave groove provided so as to surround the required opening of the metal plate is a closed loop, and the concave groove made of synthetic resin is provided in the concave groove. Since the sealing material forms a closed loop along this groove and protrudes from the groove, it forms a continuous seal line surrounding the opening on the joint surface of the joint portion and crimps it, so that around the opening portion of the joint portion. Can be sealed, especially when the base of the sealing material made of synthetic resin, which is attached to the metal plate, is located in the groove along the surface of the metal plate, and the fastening force of the joint part is offset. Since it is locked in the concave groove even if it receives a position displacement external force in the width direction due to the like, it is possible to prevent the sealing material made of synthetic resin from being displaced or peeled due to the displacement. Synthetic tree by fastening joints The sealing material made of is compressed, and even when the surface of the metal plate and the joint surface come into close contact with each other, the sealing material made of synthetic resin is not compressed to a depth equal to or more than the depth of the groove, so that peeling or cracking occurs. It is possible to prevent the peeling and cracks from occurring without being damaged. Therefore, the stable sealing property can be maintained for a long period of time and the life is long.

In the structure in which the play is provided between the inner peripheral surface of the concave groove and the seal material, when the seal material made of the rigid resin is compressed by the fastening of the joint, the play portion allows the seal material to escape. As a result, peeling or cracking due to the fastening of the joint is less likely to occur in the synthetic resin sealing material.

In this case, in the structure in which the inner peripheral surface of the concave groove is inclined outward toward the upper side, there is a gap between the base of the sealing material made of synthetic resin to the metal plate and the bottom of the concave groove. Without making any play, it is possible to sufficiently prevent the displacement of the sealing material and peeling due to this, and at the same time, widen the concave groove toward the opening of this to prevent the play with the sealing material made of synthetic resin. The sealing material can be easily provided to further protect the sealing material against the peeling and cracking.

[0012]

EXAMPLE A metal gasket as a first example of the present invention shown in FIGS. 1A and 1B will be described.

The present embodiment is a metal gasket used as a cylinder head gasket of an internal combustion engine. As shown in FIG. 1 (a), a metal plate 1 made of stainless steel or mild steel is used as a base material. Various openings such as a combustion chamber hole 2, a bolt hole 3, a water hole 4, and an oil hole 5 are formed in predetermined positions on the metal plate 1 in predetermined shapes. However, the type, number, and position of these openings are variously set as needed.

Here, the openings such as the combustion chamber hole 2, the water hole 4, and the oil hole 5 are shown by phantom lines in FIG. 1B so that fuel, combustion gas, water, and oil do not leak out. At the joint portion 8 between the cylinder block 6 and the cylinder head 7, the respective joint surfaces 6
It is necessary to seal between a and 7a.

On both front and back surfaces of the metal plate 1, closed loop concave grooves 11, 12, and 13 are formed to surround the combustion chamber hole 2, water hole 4 and oil hole 5 which are required openings for sealing. The sealing material 14 made of synthetic resin is placed in the grooves 11 to 13.
16 are provided so as to project from the concave grooves 11 to 13.
When there are a plurality of openings of the same type, in the particular case where they are located close to each other as in the combustion chamber hole 2 of the present embodiment, as shown in FIG. Recessed groove 11 and sealing material 1 that collectively enclose adjacent ones
It can be 4.

As described above, the recessed grooves 11 to 13 provided so as to surround the combustion chamber hole 2, the water hole 4, and the oil hole 5 which are openings required to seal the metal plate 1 are closed loops, and the recessed grooves are formed. 1
Synthetic resin sealing materials 14 to 16 provided in 1 to 13
1 forms a closed loop as shown in FIG. 1A along the concave grooves 11 to 13 and protrudes from the concave grooves 11 to 13 as shown in FIG. Since a continuous seal line surrounding the combustion chamber hole 2, the water hole 4 and the oil hole 5 is formed on the joint surfaces 6a and 7a of the above, and is crimped, the combustion chamber hole 2, the water hole 4 and the oil hole 5 of the joint portion 8 are formed. Can be sealed around each.

In particular, the base portions 14a to 16a of the synthetic resin sealing members 14 to 16 attached to the metal plate 1 are located in the concave grooves 11 to 13 on the surface of the metal plate 1 along the base portions 14a to 16a.
Even if a lateral displacement positional external force is applied due to an offset of the fastening force of the joint portion 8 or the like, it is locked in the concave grooves 11 to 13. Therefore, the synthetic resin sealing materials 14 to 16 are displaced or displaced. It is possible to prevent peeling.

Further, when the joint portion 8 is fastened, the synthetic resin sealing materials 14 to 16 are compressed, and this is shown in FIG.
Even when the surface of the metal plate 1 and the joint surfaces 6a and 7a come into close contact with each other beyond the compressed state indicated by the phantom line, the sealing materials 14 to 16 made of synthetic resin are equal to the depth of the concave grooves 11 to 13. Since it is not compressed as described above, it is not damaged until peeling or cracking occurs, and the occurrence of peeling or cracking can be prevented.

Therefore, the metal gasket of this embodiment has a long service life capable of maintaining stable sealing performance for a long period of time.

As the synthetic resin material suitable for the sealing materials 14 to 16, in the case of the metal gasket for the purpose of the present embodiment, those having good heat resistance, oil resistance and pressure resistance are suitable, and the surface of the conventional soft gasket is preferable. The synthetic resin material used for the treatment can be used, and specific examples thereof include soft synthetic resins such as silicon-based, fluorine-based, and rubber-based.

In order to provide the sealing materials 14 to 16 made of synthetic resin in the concave grooves 11 to 13 of the metal plate 1, it is preferable to print by a silk printing method. However, the method is not limited to this, and may be provided by any method. In some cases, the molded product can be retrofitted.

The depth A of the grooves 11 to 13 can be variously set according to the thickness T of the metal plate 1 and the material. In this embodiment, the thickness T of the metal plate 1 is (1.0 to 1.5) T.
It was suitable to set it to about / 10. The height C of the sealing materials 14 to 16 in this case is (1.5 to 4.0) T.
It was suitable to set it to / 10.

The width B of the sealing materials 14 to 16 is appropriately set depending on the conditions of the flange to be tightened, but is generally 1 to 5 mm. Further, it is preferable that the widths of the recessed grooves 11 to 13 are also equal to the width B of the sealing materials 14 to 16 in order to sufficiently exert the above-mentioned position deviation prevention function. However, some play may be provided in some cases.

In the present embodiment, the concave grooves 11 to 13 have a shape in which the inner peripheral surfaces 11a to 13a rise vertically.
Since the sealing materials 14 to 16 have a chevron cross section, a play S is formed between the inner peripheral surfaces 11a to 13a of the concave grooves 11 to 13 and the sealing materials 14 to 16.

As a result, the synthetic resin sealing materials 14-1
When the joint 6 is compressed by the fastening of the joint portion 8 as shown by an imaginary line in FIG.
Since it is an escape allowance of ~ 16, synthetic resin sealing material 14
It is more difficult for peeling and cracks due to the fastening of the joint portion 8 to occur in the parts # 16 to # 16.

However, it goes without saying that the sealing materials 14 to 16 may have a rectangular cross-sectional shape so that there is no play S between them and the concave grooves 11 to 13.

In this embodiment, the concave grooves 11 to 13 and the sealing members 14 to 16 made of synthetic resin are formed on the front and back surfaces of the metal plate 1.
However, it may be provided only on one surface depending on the combined use with other gaskets or depending on the application, and the sealing structure on the other surface may be another already known sealing structure.

FIG. 2 shows a second embodiment of the present invention, in which the inner peripheral surfaces 11a to 13a of the concave grooves 11 to 13 are inclined outward toward the upper side, and a sealing material 14 to 14 made of synthetic resin is used. Between the bases 14a to 16a attached to the metal plate 1 of 16 and the bottoms of the recessed grooves 11 to 13 with the same width B, no play is made, and the positional displacement of the sealing materials 14 to 16 and the resulting peeling are sufficiently caused. Groove 1
1 to 13 are spread toward the openings thereof to facilitate the provision of the play S between the synthetic resin sealing members 14 to 16 to further protect the sealing members 14 to 16 against the peeling and cracking. Can be planned.

FIG. 3 shows a third embodiment of the present invention, and FIG.
In the same recessed grooves 11 to 13 as in the second embodiment, synthetic resin sealing members 14 to 16 having a rectangular cross section are provided so that the play S and the action and effect thereof can be obtained. . In this embodiment, even if the height C is the same as that of the first embodiment, the volume of the sealing material becomes large,
In the same fastening state, a larger and wider crimped state can be obtained between the joint surfaces and the sealing effect can be increased.

FIG. 4 shows a fourth embodiment of the present invention, in which the grooves 11 to 13 of the metal plate 1 are formed at the opening edges of the combustion chamber hole 2, the water hole 4 and the oil hole 5 which are the openings of the metal plate 1. And the folded portion 1a is formed on the surface side provided with the synthetic resin sealing materials 14 to 16, and the sealing material 14 to 16 is formed by the step S1 formed between the folded portion 1a and the surface of the metal plate 1. Groove 11 to
It is prevented from being compressed more than the size of the height of 13 plus the step S1 to facilitate protecting the sealing materials 14 to 16 from excessive compression. Therefore, the life of the sealing materials 14 to 16 can be further extended. Instead of the folded-back portion 1a, another member may be joined by welding or the like, or may be a portion whose thickness is increased by press working.

FIG. 5 shows a fifth embodiment of the present invention, in which the grooves 11 to 13 and the sealing materials 14 to 16 made of synthetic resin are used.
The bead 1b adjacent to the concave grooves 11 to 13 is formed on the metal plate 1 provided with, and the sealing material 14 to
It is possible to obtain a double-sealed state in parallel with 16, and to relieve excessive compression of the sealing materials 14 to 16 by the elastic force of the bead 1b, and to easily restore it. This also makes it possible to extend the life of the sealing materials 14-16.

FIG. 6 shows a sixth embodiment of the present invention, which is the fourth embodiment.
The auxiliary plate 21 applied to the surface of the metal plate 1 on which the concave grooves 11 to 13 are not formed, instead of the folded-back portion 1a of the embodiment.
Is wound around the opening edges of the combustion chamber hole 2, the water hole 4, and the oil hole 5 to form a folded-back portion 21a which is folded back to the side on which the concave grooves 11 to 13 are provided. S1 is formed. According to this embodiment, the size of the step S1 can be freely set by selecting the thickness of the auxiliary plate 21 to be used, and for example, the bead 2 as shown in FIG.
It is also possible to provide a seal on the side of the metal plate 1 where the concave grooves 11 to 13 are not provided by providing 1b.

[0033]

According to the main features of the metal gasket of the present invention, the base portion of the synthetic resin sealing material attached to the metal plate is located in the concave groove along the surface of the metal plate, Prevents the sealing material made of synthetic resin from being displaced or peeled off due to displacement because it is locked in the groove even if it receives an external force that causes positional displacement in the width direction due to deviation of the fastening force of the joint. However, even if the sealing material made of synthetic resin is compressed by the fastening of the joint portion and this compression comes into close contact with the surface of the metal plate and the joint surface, the sealing material made of synthetic resin is as deep as the depth of the concave groove. It is not compressed as described above, and the occurrence of peeling or cracking is prevented without being damaged until peeling or cracking occurs, so that stable sealing property can be maintained for a long period of time and the life is long.

According to the structure in which the play is provided between the inner peripheral surface of the concave groove and the seal material, when the seal material made of synthetic resin is compressed by fastening the joint portion, the play is sealed. Since it serves as a clearance for the material, peeling or cracking due to the fastening of the joint portion is less likely to occur in the synthetic resin sealing material.

In this case, according to the structure in which the inner peripheral surface of the groove is inclined outward toward the upper side, the base of the sealing material made of synthetic resin adhered to the metal plate and the bottom of the groove are formed. There is no play between the seal material and the gap between the seal material and the synthetic resin seal material so that the groove is widened toward the opening of the seal material while the position shift and the peeling due to this can be sufficiently prevented. The play can be easily provided to further protect the seal material against the peeling and cracks.

[Brief description of drawings]

FIG. 1 is a perspective view and a sectional view of a metal gasket showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a metal gasket showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a metal gasket showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a metal gasket showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a metal gasket showing a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a metal gasket showing a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate 2 Combustion chamber hole 4 Water hole 5 Oil hole 11-13 Concave groove 11a-13a Inner peripheral surface 14-16 Seal material S Play

Claims (3)

[Claims] 1. A closed-loop concave groove that surrounds a required opening of a metal plate is formed on the surface of the metal plate, and a sealing material made of synthetic resin is provided in the concave groove so as to protrude from the concave groove. A metal gasket characterized by. 2. The metal gasket according to claim 1, wherein play is provided between the inner peripheral surface of the groove and the sealing material. 3. The metal gasket according to claim 2, wherein the inner peripheral surface of the groove is inclined outward toward the upper side.