JPS5891965A - Metal gasket - Google Patents

Abstract

PURPOSE:To obtain a gasket with high sealing capacity as well as good thermal resistance and conductivity by roughing its surface and forming convex parts concentrically and vertically from both surfaces on the circumferential part around a gasket hole. CONSTITUTION:A gasket 1 consists of a metal plate such as aluminum or other soft metals, and its both surfaces are roughed by blasting or other process. Meanwhile, on a circumferencial part 3 around a gasket hole, convex parts 4 and 4' are formed concentrically and vertically from both surfaces. This construction permits to obtain a high sealing capacity by a concentrated stress added to the convex parts 4 and 4'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal gasket used as a 7-lunge gasket, a small cylinder rad gasket, etc. for internal combustion engines.

Conventionally, a 7-lunge gasket, a cylinder head gasket, etc., is attached to the joint surface of two relatively fixed members, such as a gasket, and the fluid is discharged from between the opposing holes provided in each of the two members. Metal gaskets that prevent leaks rarely use asbestos as their main material.Also, most use synthetic rubber as a binder, and after kneading these, they are made into sheets. To explain this conventional asbestos sheet gasket using drawings, Fig. 1 shows a 72-inch gasket, which is made from a synthetic material mainly made of asbestos. Sheet gasket 01, which is formed by kneading rubber as a binder, contains 7
A gasket hole 02 is provided which corresponds to the hole to be sealed in the lunge member.

The periphery of this gasket hole 020 is covered with a thin metal grommet 03 for reinforcement.

Further, a bolt hole 04 is formed in the periphery of the gasket O1, and two opposing 7272 members are fixed relative to each other by bolts passed through the bolt hole 04, and the gasket hole 01 is inserted between them. It is designed to be compressed and compressed.

Figure 2 shows a RAD gasket for internal combustion engine cylinders. This gasket manufactured by 05 Company also uses steel plate, etc., on the surface of a sheet member made by kneading Aspect mainly with synthetic rubber as a binder. It is formed by covering a thin metal plate 06. This gasket 05 is provided with a gasket hole 07 corresponding to the cylinder hole, a hole 08 corresponding to the passage hole for cooling water, lubricating oil, etc., a bolt hole 09, etc.
．． There is also a thin metal grommet 010 around the periphery of 08.
is covered. This gasket is compressed by being sandwiched between the cylinder and cylinder head, which are fixed to each other by bolts. Also, Fig. 3 shows a cylinder head gasket similar to Fig. 2, or a sheet member made of a mixture of asbestos and synthetic rubber like the one in Fig. 2 is covered with a thin metal plate O6. In contrast, a gasket 012 is shown in which a porous iron plate 011 is used as a t-material and coated with a mixture of asbestos and synthetic rubber and formed into a sheet shape.

All of these conventional gaskets utilize their compressibility to seal.

Asbestos is fibrous and has good compressibility, so it was considered to be a suitable material for such gaskets. In addition, asbestos has extremely high heat resistance,
Asbestos gaskets have been used in most cases where high-temperature fluids come into contact with gaskets.

However, asbestos has limited resources as an underground resource, and it has become a problem that asbestos has an adverse effect on the human body during the manufacturing process of its products.

Furthermore, due to the use of asbestos products in automobiles and the like, a problem has arisen in that asbestos powder is dispersed into the air and causes pollution.

t 7'C1 In conventional asbestos gaskets, although asbestos itself, the main raw material, has high heat resistance,
Since the synthetic rubber used as a binder deteriorates at about 150° C. at most, its strength deteriorates rapidly at high temperatures. For example, in the case of a cylinder head gasket, high temperature and high pressure gas acts on the gasket due to combustion and explosion of fuel within the cylinder.

Therefore, the coating of the thin metal plate 06 as shown in FIG. 2 is reinforced with a porous iron plate 011 as shown in FIG. The strength of the periphery of the hole 07 was reduced, and gas was sometimes blown out. When trying to scale up by increasing the diameter of the cylinder hole, or when trying to make the internal combustion engine more compact, the spacing between the cylinders must be narrowed, especially in the case of a multi-cylinder internal combustion engine. Therefore, the gas blow-through at this gasket part was an obstacle.

Grommet 010 to further strengthen the peripheral part of hole 07
Even if I tried to increase the width of the grommet 010, I ran into a limit in preventing the grommets 010 from overlapping each other. Furthermore, when the distance between the cylinders is narrowed, extremely high temperatures of 230 to 250 degrees Celsius are transmitted to the gasket, so the gasket itself must have good thermal conductivity, but with conventional asbestos gaskets,
Another drawback was that the synthetic rubber used as a binder had poor thermal conductivity. From the above, it has been difficult to scale up or reduce the weight and weight of internal combustion engines by increasing the diameter of the cylinder holes of internal combustion engines using conventional asbestos cylinder/dahenode gaskets.

The present invention takes advantage of the above, eliminates the above drawbacks by forming the gasket only from a single metal material, and provides a metal gasket in which a sealing effect is obtained by concentrated stress applied to the periphery of the hole to be sealed. This is what we are trying to provide.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 4 and 6 show a metal gasket according to the invention, and FIG. 5 shows a flange joint equipped with the metal gasket.

In FIG. 4, the gasket 1 is made by roughening both surfaces of a soft metal plate such as aluminum to a pear-like shape with plastic or the like, and also includes perforations to be sealed, such as bolt holes, provided in the metal gasket 1. Convex portions 4 and 1 are formed concentrically in the vertical direction from both surfaces of the gasket hole s3 such as the oil hole.

When such a metal gasket l is used as a gasket for 7 lunges, as shown in FIG.
Align the gasket hole 2 of the gasket l with the hole 8 to be sealed provided in the rank member 5.6. Then each 7
Insert the tightening bolt 9 into the bolt hole 4 of the rank member 5.6 and tighten it. The 7-rank members 5.6 are fixed to each other by the tightening bolts 9, and the gasket l has a non-directional and uniform satin pattern 8 on both surfaces by physical surface treatment by sandblasting or chemical surface treatment such as etching. Therefore, the contact surface between both surfaces of the gasket 1 and the inner end 10.11 of the flange member 5.6 has a non-directional and uniform satin pattern B, which increases the sealing performance due to countless point contacts. be able to. That is, 1. When such a satin pattern B is formed, the unevenness of the satin pattern S digs into the directional roughness of the contact surface of the 7-rank portion 5.6, and furthermore, due to the countless unevenness, the gasket l Surface and flange members 5.6
There is a state of contact between the surfaces at countless points, and the fluid interposed between the two, such as air that fills the microscopic gap, automatically seals due to the labyrinth effect, so the clamping pressure acts effectively, The sealing effect becomes even more reliable. Further, a gasket hole 2 provided in the gasket 1 to be sealed
The peripheral edge portion 3 of has convex portions 4.4 formed concentrically in the vertical direction from both surfaces. Therefore, the gasket 1 and the 7-rank member 5.6 come into contact with each other with partially high stress at two locations above and below the convex portion 4.4', so that the sealing performance of the gasket 1 is further improved.

Thus, the metal gasket Ml of the present invention is suitable as a radial gasket for a cylinder for an internal combustion engine. That is, since it is integrally formed of metal, it has good heat resistance and thermal conductivity. In particular, if aluminum is used as the material, the material will be almost the same as the material of the internal combustion engine itself, so the thermal conductivity will be extremely high. Furthermore, when used as a rad gasket for the cylinders of a multi-cylinder internal combustion engine, as shown in Fig. 6, the distance H between the holes 12 corresponding to the cylinder holes becomes small, and as described above, with a normal asbestos cylinder gasket, gas Blow-through is likely to occur, causing a reduction in the output of the internal combustion engine, but this is also due to the fact that the metal grommets for reinforcing the 20-circle gasket hole overlap, forcing the width to be narrowed. In the present invention, such conventional drawbacks can be overcome. In other words, in the metal gasket of the present invention, the above-mentioned molded parts can be integrated, so even if the width of the above-mentioned H is small, the strength is sufficient. This prevents gas from blowing out.

Therefore, it is possible to effectively cope with scale-up based on the increase in the diameter of the cylinder holes of an internal combustion engine and with bringing the cylinder holes closer together due to the lightweight compactness.

As described above, according to the present invention, a gasket with a high sealing effect can be obtained using metal without using asbestos at all, so that the gasket can be made to have good heat resistance, good thermal conductivity, and pressure resistance. Furthermore, since the metal gasket according to the present invention can be manufactured by simple operations such as continuous pressing operations, it can be easily mass-produced, and therefore, a low-cost product can be obtained, which is excellent in economic efficiency.

[Brief explanation of the drawing]

Figure 1 shows a conventional 7-run gasket.
2 is a plan view of a conventional cylinder head gasket for an internal combustion engine, and FIG. 3 is a longitudinal section showing a part of another conventional cylinder head gasket for an internal combustion engine. 4 is an enlarged vertical cross-sectional view of a part of the metal gasket of the present invention, FIG. 5 is a vertical cross-sectional view showing the metal gasket of the present invention using a flange joint, and FIG. It is a top view which shows a part of cylinder head gasket for internal combustion engines. l...Gasket. 2・・・・・・・・・
...Gasket hole. 3......peripheral area. 4.4゛・・・・・・
...Protrusion. S・・・・・・Satin pattern. Patent Applicant Arai Seisakusho Co., Ltd. s1 Figure 2 1A4 Notebook 5

Claims (1)

[Claims] In a metal gasket, both surfaces of a soft metal plate such as aluminum are roughened to a pear-like texture by blasting, etc., and holes to be sealed are formed in the metal gasket, such as gasket holes such as oil holes including bolt holes. A metal gasket characterized in that a concentric convex portion is formed on the peripheral edge in the vertical direction from both surfaces.