JP4255246B2 - Metal gasket and manufacturing method thereof - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a metal gasket and a manufacturing method thereof, and more particularly, to a split type metal gasket used as a gasket for a bubble cover or an oil pan and a manufacturing method thereof.
[0002]
[Contents of prior art]
Conventionally, metal gaskets used for bubble covers and oil pans are made 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, and using this as a punching die. An integrally stamped metal gasket is known.
Normally, a sealing material such as a gasket is attached to the periphery of the opening and is tightened by a cover member to form a sealing action. When the gasket along the opening is punched from the gasket material as described above, Most of the inside remains as a residue.
A joint-integrated manufacturing method has been developed in which split gaskets are connected in order to make use of the punched debris. For example, the joints can be formed by providing irregularities or simply bonding them together. Connection methods such as integration are adopted.
[0003]
[Problems to be solved by the invention]
However, in the integrated method for engaging the concavo-convex portions as described above, the connecting portion cannot be completely connected due to the structure, so a seal connecting material that flows into the gap portion like a liquid gasket is required. Even if they are integrated by means, if they are mounted and tightened, the surface pressure will be non-uniform due to the difference in material, and there is a high risk of oil or the like leaking from the connecting portion that tends to be low surface pressure.
In addition, the adhesive integration method using an adhesive tends to have a multi-layer structure, such as requiring a partially overlapped part for bonding, and greatly restricts the use application.
[0004]
The present invention has been made in view of such many drawbacks, and an object thereof is to provide a metal gasket that can be used without loss and has excellent sealing performance.
[0005]
[Means for Solving the Problems]
The present invention will be described with reference to the drawings. As shown in FIG. 2, a metal gasket in which a coating layer 2 made of a soft elastic seal member is integrally formed on the surface of a steel plate 1 such as a cold rolled steel plate or a stainless steel plate via an adhesive. As shown in FIG. 1, a plurality of gasket components a are temporarily assembled into a desired gasket shape, and the joints arranged so as to be connected around the bolt holes are welded 3a or caulked 3b. sticking allowed integral Te, wherein the covering member 21 made of soft elastic seal member brought filled form to junction 3, it is characterized that you punched into a desired shape.
[0006]
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 plate 1 with an adhesive, and a plurality of gasket constituent members a made of the steel plate 1 and the coating layer 2 are provided. As shown in FIG. 1, the gasket component member a is temporarily assembled, and the joint portion 3 arranged so as to be connected around the bolt hole portion is welded 3a or caulked 3b and fixed and integrated. allowed the to the joint 3 which is fixed made of a soft elastic sealing member covering material 21 brought into the filling formation is characterized that you punched into a desired shape.
[0007]
Further, a plurality of gasket constituent members a made of the steel plate 1 are temporarily assembled into a desired gasket shape, and the joint portion arranged so as to be connected around the bolt hole portion is welded and integrated by welding 3a or caulking 3b. Cough,
The fixed integral a covering member 21 made of soft elastic seal member to the entire surface or partial surfaces of the upper and lower surfaces of the steel plate 1 brought coating formed via a bonding agent, it is characterized that you punched into a desired shape.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As described above, according to the present invention, a plurality of gasket constituent members a are formed from a gasket material (in many cases, a waste piece), these are temporarily assembled into a desired shape, and the joint portion is fixed by welding 3a or caulking 3b. Turn into. Thereafter, a covering material 21 made of the same elastic material as that of the covering layer 2 is filled in the fixed joint portion 3 and punched into a desired shape to form a metal gasket. In other words, the present invention has succeeded in forming a split-type metal gasket that is seamless in terms of material and performance.
[0009]
【Example】
FIG. 1 is a plan view showing an embodiment of a metal gasket according to the present invention, and FIG. 2 is a cross-sectional view of a joint AA ′ of FIG. FIG. 3 is a plan view of a joint structure.
4 is a cross-sectional view taken along the line BB ′ of FIG. FIG. 5 is a cross-sectional view in which a coating layer is provided after the steel plates are joined and formed. FIG. 6 is a cross-sectional view of provisional assembly with magnetic poles.
2, 4 and 5 show the basic structure and manufacturing method of the metal gasket.
[0010]
In the gasket material of the present invention, the coating layer 2 is formed on the surface of the steel plate 1 to which an adhesive has been applied in advance using a soft elastic sealing member, for example, a rubber compound or a rubber compound in which compressive fibers are mixed. In the molding of the gasket component member a here, it is the most effective modeling method to utilize the punched-out portion of the inner part left after being punched from the gasket material, but it is a standard dimension for improving the half-finished material or the yield. The material can be used efficiently.
[0011]
The joint portion of the gasket component member a is integrated into a gasket shape by welding 3a or caulking 3b. The joint portion is connected around the bolt hole portion having the highest surface pressure and stability as shown in FIG. Therefore, the seal safety is higher than the arrangement.
[0012]
Laser welding using a laser beam (micro spot welding) is suitable as a welding means for manufacturing such a metal gasket, and a smooth surface with a good finish can be obtained with minimal influence on other parts that are not welded. It will be.
[0013]
On the other hand, in the case of fixing by caulking 3b, it is easiest to form the joint portion 3 as an engagement shape as shown in FIG. 3 and to partially integrate it by rolling it partially as shown in FIG. This is a caulking 3b connection method.
[0014]
In the temporary assembly of a plurality of gasket constituent members a, it is possible to achieve the simplest and cheapest structure for magnetic attachment with magnets. However, as shown in FIG. By giving different magnetic poles to each other, the gasket constituent members a themselves form a magnetic field and come into close contact with each other, and a more accurate and stronger temporary joining is realized.
[0015]
As shown in FIG. 2, the same material (using a different material) as that disposed on the surface of the steel sheet 1 as shown in FIG. 2 is joined to the joints 3 between the gasket component members a integrated through the above-described steps. The coating material 21 is formed by heating and compressing (or curing at room temperature) to complete a metal gasket having no step on the surface.
[0016]
Further, in order to simplify the manufacturing process, it is also possible to form the gasket component member a into a rough shape and fix and integrate them, and then punch and form them with a punching die of a desired shape. Further cost reduction can be achieved.
[0017]
In addition to the manufacturing method described above, a plurality of gasket constituent members a made of a steel plate 1 having no coating layer 2 are temporarily assembled, and their joints are welded or caulked to be fixed and integrated. As shown, a covering material 21 made of a soft elastic sealing member can also be applied and formed in layers via an adhesive. Here, there is a degree of freedom in forming the covering material 21 and the entire surface of the steel sheet 1 is not formed, but a string shape. Alternatively, it can be formed on a partial surface such as a double line (not shown), which enables a design that meets the sealing requirements.
[0018]
The rubber compound in which the above-described compressive fiber is mixed is formed by mixing a base fiber of a compressible organic fiber or compressible inorganic fiber other than asbestos, rubber, a filler, and the like.
As the compressible fiber, glass fiber, ceramic fiber, rock wool, mineral wool, fused quartz fiber, whisker, boron fiber, carbon fiber, etc. can be adopted. On the other hand, as a rubber material, nitrile butadiene rubber (NBR), Styrene butadiene rubber (SBR), isoprene rubber (IR), chloroprene rubber (CR), butadiene rubber (BR), butyl rubber (IIR), ethylene-propylene rubber (EPM), fluoro rubber (FPM), silicone rubber (Si), etc. Can be used alone or mixed with the above-mentioned base fiber.
[0019]
【The invention's effect】
As described above, the present invention can exhibit a high sealing performance that is a little inferior to an integrally molded product while being a low-cost split-type gasket, and eliminates the need for a sealing joint material such as a liquid gasket and is economical. This is a metal gasket that shows extremely superiority.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG.
FIG. 3 is a plan view showing another embodiment of the present invention.
4 is a cross-sectional view taken along the line BB ′ of FIG.
FIG. 5 is a cross-sectional view showing another embodiment of the present invention.
FIG. 6 is a cross-sectional view showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel plate 2 Coating layer 21 Coating material 3 Joint part 3a Welding 3b Caulking a Gasket component

Claims (3)

In a metal gasket in which a coating layer made of a soft elastic sealing member is integrally formed on the upper and lower surfaces of a steel plate via an adhesive,
Temporarily assembling a plurality of gasket components into a desired shape, and welding or caulking the joints arranged so as to be connected around the bolt holes, and fixing them together.
After allowed filling forming a coating member made of a soft elastic seal member to the upper and lower surfaces of the joints and the fixed metal gasket according to claim Rukoto allowed punching into a desired shape. A method for producing a metal gasket in which a coating layer made of a soft elastic sealing member is integrally formed on an upper and lower surface of a steel plate via an adhesive,
Forming a plurality of gasket components comprising the steel plate and the coating layer;
Temporarily assembling the gasket constituent members, the joints arranged so as to be connected around the bolt holes are welded or caulked to be fixed and integrated, and the upper and lower surfaces of the fixed joints are transferred from the soft elastic seal member comprising coating material allowed to fill forming method of the metal gasket according to claim Rukoto allowed punching into a desired shape. 3. The metal gasket according to claim 1 or 2, wherein the welding is laser welding.

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