JP2003336743A - Metal gasket and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a split type metal gasket used as a gasket and its manufacturing method. <P>SOLUTION: A covered layer 2 consisting of the compound mixing the compressive fiber with the rubber is integrally formed on the surface of a steel board 1 through adhesives, the joint part is integrally fixed by temporally assembling a plurality of gasket composition member a, and the covering material 21 consisting of the compound of the compressive fiber and rubber is formed to fill the joint part 3. The gasket exerts high sealing performance without requiring a sealing binder. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket and a method for manufacturing the same, and more particularly to a split type metal gasket used as a gasket for a bubble cover or an oil pan and a method for manufacturing the same.

[0002]

Description of the Related Art Conventionally, a metal gasket used for a bubble cover or an oil pan is a gasket material by forming a layer of a sealing material made of an elastic material on a metal sheet made of cold rolled steel or stainless steel. A metal gasket in which this is integrally punched by a punching die is known. Usually, a sealing material such as a gasket is attached to the peripheral edge of the opening and is tightened by a cover member to perform a sealing action. When the gasket along the opening is punched from the gasket material as described above, Most of the inside remains as scraps. In order to make use of this scrap, a joint integrated manufacturing method has been developed in which divided gaskets are connected, and at the joint part, for example, unevenness is provided to engage these, or by simply adhering them. The connection method such as making them integrated is adopted.

[0003]

However, in the integrated method in which the uneven portions are engaged as described above, since the connecting portions cannot be completely connected due to the structure, a seal which flows into a gap portion such as a liquid gasket is formed. A connecting material is required, and even if it is integrated by such means, if it is mounted and tightened, uneven surface pressure will occur due to the difference in material, and there is a risk of oil leaking from the connection part that tends to be low surface pressure. It has a high quality. In addition, the adhesive integration method using an adhesive tends to have a multi-layered structure, such as requiring a partially overlapped portion for adhesion, which greatly limits its application.

In view of such many drawbacks, an object of the present invention is to provide a metal gasket which can be used as a material without loss and is excellent in sealing performance.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 2, a coating layer 2 made of a soft elastic seal member is bonded to the surface of a steel plate 1 such as a cold rolled steel plate or a stainless steel plate. A metal gasket integrally formed through an agent, wherein a plurality of gasket constituent members a are temporarily assembled into a desired gasket shape as shown in FIG. 1, and the joints thereof are fixed by welding 3a or caulking 3b. It is characterized in that the joint portion 3 is filled with a covering material 21 made of a soft elastic seal member.

A method of manufacturing a metal gasket, in which a coating layer 2 made of a soft elastic sealing member is integrally formed on the surface of a steel sheet 1 with an adhesive, the gasket constituting member comprising the steel sheet 1 and the coating layer 2. A plurality of a are formed, the gasket constituent member a is temporarily assembled as shown in FIG. 1, and the joint 3 is welded 3a or caulked 3b to fix and integrate them, and soft elasticity is applied to the fixed joint 3. It is characterized in that the covering material 21 made of a sealing member is filled and formed.

Further, a plurality of gasket constituent members a made of the steel plate 1 are temporarily assembled into a desired gasket shape, and the joints thereof are welded 3a or caulked 3b to be fixedly integrated.
It is characterized in that a coating material 21 made of a soft elastic seal member is applied and formed on the entire upper surface or a partial surface of the steel plate 1 which has been fixed and integrated by an adhesive agent.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, according to the present invention, the gasket material (in many cases, scraps) is removed from the gasket component a.
A plurality of them are formed, these are temporarily assembled in a desired shape, and the joints thereof are fixedly integrated by welding 3a or caulking 3b. Thereafter, the covering material 21 made of the same elastic material as the covering layer 2
To form a metal gasket by filling the fixed joint portion 3 with the metal. That is, the present invention succeeds in forming a split type metal gasket that is seamless in terms of material and performance.

[0009]

1 is a plan view showing an embodiment of a metal gasket according to the present invention, and FIG. 2 is a joint portion AA 'of FIG.
FIG. FIG. 3 is a plan view of the joint structure of the joint portion. FIG. 4 is a sectional view taken along the line BB ′ of FIG. FIG. 5 is a cross-sectional view in which a coating layer is provided after connecting and forming steel plates. FIG. 6 is a cross-sectional view of temporary assembly with magnetic poles. 2, FIG. 4, and FIG. 5 show the basic structure and manufacturing method of the metal gasket.

The gasket material of the present invention has a coating layer 2 formed on the surface of a steel sheet 1 to which an adhesive has been applied in advance, using a soft elastic sealing member such as a rubber compound or a rubber compound containing a compressible fiber. In the molding of the gasket component a here, the most effective molding method is to use the scraps of the inner part left after being punched from the gasket material. It is acceptable to use standard size materials efficiently.

The joint portion of the gasket constituent member a is integrated into a gasket shape by welding 3a or caulking 3b. As shown in FIG. 1, the joint portion has a bolt hole portion having the highest surface pressure and stability. The safety of the seal is higher than that of the arrangement that is connected as the center.

As a welding means for producing such a metal gasket, laser welding using a laser beam (micro spot welding) is suitable, and the effect on other portions not welded is minimized and the finish is good and smooth. The surface will be obtained.

On the other hand, in the fixing by the caulking 3b, the joining portion 3 is formed into an engaging shape as shown in FIG. 3, and this is partially rolled as shown in FIG. This is the simplest caulking 3b connection method.

A plurality of gasket constituent members a
When temporarily assembling, the magnetic attachment with a magnet can be the simplest and cheapest structure, but by advancing this, by providing different magnetic poles to the gasket constituent members a that are in contact with each other, as shown in FIG. The constituent member a itself forms a magnetic field and comes into close contact with each other, and more accurate and strong temporary joining is realized.

The same material (different material) as the one provided on the surface of the steel sheet 1 as shown in FIG. 2 to the joint 3 between the respective gasket constituent members a integrated through the above steps. Can also be used)
The coating material 21 without heating, compression, etc. (can be cured at room temperature)
To form a metal gasket with no steps on its surface.

Further, in order to simplify the manufacturing process, it is also possible to form the gasket constituent member a into a rough shape, fix and integrate them, and then perform punching with a punch having a desired shape. , Here, further cost reduction can be achieved.

In addition to the above-mentioned manufacturing method, a plurality of gasket constituent members a made of the steel plate 1 without the coating layer 2 are temporarily assembled, and the joints thereof are welded or caulked to be fixedly integrated, and the upper and lower surfaces thereof are joined together. As shown in FIG. 5, the covering material 21 made of a soft elastic sealing member may be applied and formed in layers through an adhesive. Here, there is a degree of freedom in forming the covering material 21 and the entire surface of the steel plate 1 is not formed. It is also possible to form on a partial surface such as a string shape or a double wire shape (not shown), and it is possible to design according to the sealing requirement.

The rubber compound in which the above-mentioned compressible fiber is mixed is formed by mixing the base fiber of the compressible organic fiber other than asbestos or the compressible inorganic fiber, the rubber and the filler. As the compressible fiber, glass fiber, ceramic fiber, rock wool, mineral wool, fused silica fiber, whiskers, boron fiber, carbon fiber, etc. can be adopted, while as the rubber material, nitrile butadiene rubber (NBR), Styrene butadiene rubber (SBR), isoprene rubber (I
R), chloroprene rubber (CR), butadiene rubber (B
R), butyl rubber (IIR), ethylene-propylene rubber (EPM), fluororubber (FPM), silicone rubber (Si) and the like can be used alone or in combination with the above-mentioned base fiber.

[0019]

INDUSTRIAL APPLICABILITY As described above, the present invention is a low-priced split type gasket, but can exhibit a high sealing performance which is not inferior to that of an integrally molded product, and a seal connecting material such as a liquid gasket is used. It is a metal gasket that is unnecessary and economically extremely superior.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB ′ of FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 steel plate 2 coating layer 21 coating material 3 joints 3a welding 3b Caulking a Gasket component

Claims (8)

[Claims] 1. In a metal gasket in which a coating layer made of a soft elastic seal member is integrally formed on the upper and lower surfaces of a steel sheet with an adhesive, a plurality of gasket constituent members are temporarily assembled in a desired shape and the joints are welded. Alternatively, the metal gasket is characterized in that the metal gasket is caulked to be fixedly integrated, and a coating material made of a soft elastic seal member is filled and formed on the upper and lower surfaces of the fixed joint. 2. A method of manufacturing a metal gasket, wherein a coating layer made of a soft elastic seal member is integrally formed on the upper and lower surfaces of a steel sheet via an adhesive, and a plurality of gasket constituent members made of the steel sheet and the coating layer are formed. The gasket component members are temporarily assembled, and the joints thereof are fixedly integrated by welding or caulking, and the upper and lower surfaces of the fixed joints are filled with a covering material made of a soft elastic seal member. Manufacturing method of metal gasket. 3. The metal gasket according to claim 1 or 2, wherein the welding is laser welding. 4. The gasket constituent member is integrally fixed, and the upper surface of the fixed joint is filled with a coating material and then punched into a desired shape. Metal gasket and its manufacturing method. 5. A plurality of gasket constituent members made of steel plates are temporarily assembled in a desired shape, and the joints thereof are welded or caulked to be fixedly integrated, and the whole or part of the upper and lower surfaces of the fixedly integrated steel plates are joined together. A metal gasket, characterized in that a coating material composed of a soft elastic sealing member is applied and formed through an adhesive. 6. The soft elastic seal member is made of a liquid or semi-solid compound that is cured after filling or coating.
Metal gasket and its manufacturing method. 7. The metal gasket according to claim 1, wherein the soft elastic seal member is made of a compound of asbestos-free compressible fiber and rubber, and a method for manufacturing the same. 8. A magnetic pole is temporarily attached to each of said gasket constituent members a by giving different magnetic poles, and the joint portion is welded or caulked to be fixedly integrated. 5. Metal gasket of 5, and its manufacturing method.