JPS6321699Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a gasket for a cylinder head of an internal combustion engine.

BACKGROUND ART A gasket for a cylinder head of an internal combustion engine, which is formed by laminating a plurality of metal plates, has a thickness of, for example, 0.6 mm.
It is made by simply laminating metal plates with a thickness of about 0.35 mm on both the upper and lower surfaces of the core metal plate, with a metal plate of about 0.35 mm in diameter as the core material, so it is used in internal combustion engines. When installed between the cylinder head and the block, the force applied when tightening the tightening bolt is often only a small amount on the remaining seat portion other than the openings, so the liquid is transferred to the laminated metal sheet. It is nearly impossible to seal with only one.

When cleaning the engine from the outside under these conditions, there is a risk that water, oil, etc. will enter the gasket from between the layers of the laminated metal plates, and the liquid will enter the bolt holes and corrode the bolts. It was hot.

Therefore, as shown in Fig. 4, when forming a laminated metal plate by laminating other outer metal plates a and a' on the upper and lower surfaces of the central metal plate a, one end of the outer metal plate a' is , and the extended part is folded back to form a grommet-cum-coating part a'' to cover the end, or as shown in FIG. In between, an elastic material such as silicone, fluorine, rubber, or asbestos C or C' is inserted over the entire surface, and the outer edge is covered with a grommet d.

Problems to be Solved by the Invention When the conventional metal laminated metal gasket shown in Fig. 4 above is installed and used between the cylinder head h and block e of an internal combustion engine, the outer plate a' Cover the end by folding it back over the face plate a.
Although it is possible to prevent water, oil, etc. from entering the gasket when the engine is cleaned from the outside by a″, it is difficult to adjust the surface pressure at the folded end, and workability is also poor accordingly. There are drawbacks.

In addition, in the conventional device shown in FIG. 5, the elastic material c,
There was a problem that c' creeped and the tightening interval with the gasket (between block e and head h) changed.

Means for Solving the Problems This invention solves the above-mentioned drawbacks.It prevents liquids such as water and oil from entering the metal layer of the gasket when cleaning the engine, and also cleans the entire gasket. In order to maintain a uniform surface pressure distribution and minimize the necessary surface pressure, epoxy is applied only between the outer edges of the laminated metal gasket, which is made by laminating multiple metal plates. This is a metal gasket for the cylinder head of an internal combustion engine, which is made of a heat-resistant elastic material such as melamine or silicone urethane resin and sealed.

Function: In a laminated gasket used for mounting on the cylinder head of an internal combustion engine, only the interlaminar surface at the outer periphery of the joint surface formed between stacked metal plates is coated with a heat-resistant elastic material and sealed at the end of the gasket. Since there is no processing such as folding back the outer surface plate, it is possible to obtain the desired surface pressure and reduce gasket creep by simply adjusting the thickness of the attached material without the need to adjust the metal plate thickness. . It also prevents fluids such as water, oil, and other cleaning water from entering from the contact surfaces of the outer edges of the laminated layers.

Example An example of this invention will be explained with reference to the drawings.
The metal gasket shown in Fig. 2 has a central metal plate 2.
3, consisting of the upper outer surface plate 1 and the lower outer surface plate 1',
Before assembling with the layer metal gasket, a heat-resistant elastic material 3 such as epoxy, melamine, fluorine, silicone urethane resin, etc. is applied to the outer edge of the core metal plate 2 by spraying or dipping, and the core metal plate 2 and the outer plate 1 and the outer edge layers of the core metal plate 2 and the outer plate 1' are sealed.

The metal gasket shown in FIG. 3 shows another embodiment, in which the outer periphery of the central metal plate 2 is formed smaller than that of the outer metal plates 1 and 1', and when stacked three times, the outer periphery A recessed portion is formed in the portion, and a heat-resistant elastic material 3, such as silicone, is applied by injecting or brushing.

Note that the heat resistance of the heat-resistant elastic material refers to one that has reached a practical range at an ambient temperature of 100 to 210 degrees Celsius, and the heat-resistant elastic material is one that is adhered within a range of 0.5 to 5 mm.

In the figure, 4 is a cylinder block, and 5 is a head.

Effects of the invention Since this invention is as described above, it is possible to prevent water and oil from outside by simply attaching a heat-resistant elastic material between the layers of the outer edge of the laminated metal plate, without having to wrap the entire outer edge of the laminated metal plate. In addition to being able to prevent infiltration, there is no need to adjust the thickness of the metal plate, and by adjusting the thickness of deposits, an arbitrary surface pressure can be obtained, and creep of the gasket can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the present invention, FIG. 2 is a cross-sectional view of the same, FIG. 3 is a cross-sectional view of another embodiment, and FIGS. 4 and 5 are cross-sectional views of the conventional example. 1... Upper metal outer plate, 1'... Lower metal outer plate, 2... Core metal plate, 3... Heat-resistant elastic material.

Claims (1)

[Scope of utility model registration request] In a laminated metal gasket formed by laminating a plurality of metal plates, a heat-resistant elastic material such as epoxy, melamine, silicone urethane resin, etc. is adhered and sealed only between the outer edges of the laminated metal plates. Characteristic metal gasket for cylinder head of internal combustion engine.