JPS58200860A - Metallic gasket - Google Patents

Abstract

PURPOSE:To obtain a high sealing performance by forming a bead on a substrate constituted of an elastic metal plate and applying sealing members onto the surfaces of a subplate constituted of a soft plate member and laminating the substrate and the subplate to form a gasket. CONSTITUTION:A metallic gasket 2 is constituted of a substrate 4 made of elastic metal plate and a subplate 6 made of a soft material applied onto the both surfaces of the substrate 4, and inserted onto the joint surface 14 between a cylinder head 10 and a cylinder block 12. On said substrate 4, a convex bead 16 is formed so as to surround a cylinder opening 18 and an oil passage 20. While, seal members 8 are applied onto the both surfaces of the subplate 6, and the unarranged part on the joint surface 14 is absorbed by the seal member 8 to form microseal and to improve the lubricity between the joint surface 14 and the metallic gasket 2, and generation of strain in the lateral direction of the bead 16 is prevented. With such a constitution, the sealing performance can be improved simply.

Description

[Detailed description of the invention] This invention relates to improvements in metal gaskets and accounts for 9%.

Preventing the joint surface from becoming irregular due to the surface pressure of the seal line, and ideal plane movement of the bead during compression.

The present invention relates to a metal gasket that achieves effective sealing by ideally dispersing the surface pressure of a seal line formed by a bead.

The invention of this application provides a metal gasket in which a convex or step-like bead is formed on an elastic metal plate, and the bead efficiently seals the joint surface between a cylinder head and a cylinder block of an internal combustion engine, for example. has already been completed and filed by a person. This metal gasket is composed of a board made of an elastic metal plate, a sub-plate provided on both the front and back sides of this board, and is laminated in the shape of one plate. ), f y It has already been announced that a seal line is formed on the joint surface to form a tight seal and achieve an outstanding sealing effect.However, this metal gasket does not cause thermal distortion of the joint surface, tool marks, , cannot compensate for irregularities such as scratches, etc.
It was. This is because the bead cannot easily slip between the joint surfaces when compressed by melting, etc.

The bead could form an ideal seal line but would not cause leaks. Furthermore, the seal line formed by the bead is extremely uneven in strength depending on the area of the surface pressure applied to the joint surface, resulting in 92 vIJ, which makes it impossible to effectively seal across all sides of the bead. There was an inescapable drawback.

The object of the invention is therefore to eliminate the above-mentioned drawbacks.

-The hardness of the plate is lower than that of the substrate, and the sub-plate made of this soft material is brought into direct contact with the mating surface to realize a metal gasket that exhibits high lubricity. In order to achieve this, the present invention forms a peak on a substrate made of an elastic metal plate, applies a sealing material to the surface of a sub-plate made of a plate material softer than the substrate, and connects the substrate and the sub-plate. It is characterized by being laminated to form a gas tight structure.

Embodiments of the present invention will be described in detail and specifically below with reference to the drawings. 1 to 4 show a 1% embodiment of the present invention. Metal gasket 2.

It is composed of a substrate 4 made of an elastic metal plate and two sub-plates 6 made of a soft material provided on both sides of the substrate 4. This metal gasket 2 is interposed on the joint surface 14 between the seven-ring head 10 and the cylinder block 12 in order to achieve a seven-ring effect.

, @ The substrate 4 is made of heat resistant steel such as stainless steel.

A pitch 1 made of a metal plate having corrosion resistance and elasticity and having a convex shape (step shape) at 9 degrees on this substrate.
6ft. Preferably, the hardness of the substrate 4 is in the range of HV300 to HV450.Next, one plate 6 is formed on both sides of the substrate 4 in a laminated manner as follows. The thickness of the sub-plate 6 is 0.15 to 0.3-, and it does not soften under heat below 400°C, and has a hardness lower than that of the substrate 4, preferably in the range of HV70 to 150, for example, an iron plate. . Further, a sealing material 8 is applied to both sides of each plate 6. As the sealing material 8, a heat-resistant and flexible material such as paint is used.

The cool thickness is preferably 50 μm or less. Due to the adhesion of this sealing material 8, tool marks on the joint surface 14,
It can compensate for and absorb irregularities such as scratches and create a micro seal. In addition, this sealing material 8 allows good sliding between the joint surface 14 and the metal gasket 2, and no distortion occurs in the lateral direction of the pead 16 (that is, in a direction parallel to the joint surface 14), resulting in an ideal sealing effect. can be demonstrated. In addition, 18 is a cylinder hole, 20 is an oil passage, and 22 is ? It is a hole.

This invention is configured as described above.

It works as follows. As shown in FIG. 4, the metal gasket 2 interposed on the joint surface 14 between the cylinder head 10 and the cylinder lock 12 is compressed by the melt fastening force.

The top part 24 of the bead is a gently curved surface, and this fastening force causes surface pressure from the seal line to be applied to the cylinder head 10114.
11. At the same time, due to this fastening force.

The end portions 26-1 and 26-2 of the bead act on the cylinder block 12 side with a pressure equal to the seal line. Due to the surface pressure caused by this seal line, the metal gasket 2 is brought into close contact with the mating surface, which is the mating surface, and leakage prevention is achieved.

However, if the sub-plate 6 is made of +i degree like the substrate 4, this sub-plate made of hard material lacks flexibility, so the surface pressure from the seal line does not act sufficiently on the mating surface, and the blood pressure decreases. The dispersion is also insufficient, the substrate 4 has historically had poor slippage, and the bonding surface 1
Thermal strain present in 4.

It cannot compensate for irregular surfaces such as tool marks and scratches.

As a result, the effectiveness of the 7-lue is drastically reduced and oil and gas leaks occur.

However, in this invention, one plate 6t made of a plate material softer than the substrate 4 is provided on both sides of the substrate 4, so that the top 24 (or the end 20-1, 2O-2) of the pedestal is
When suppressing this secondary plate 6 to the seventh cylinder head 910-, uniform surface pressure by the seal line is applied to the joint surface 14 while achieving ideal surface pressure distribution, thereby achieving a good sealing effect.

If the sealing material 8 is applied to the surface of the secondary plate 6 on the side of the cylinder radius 10, thermal distortion, tool marks, scratches, and other uneven surfaces of the cylinder head 10 can be more effectively compensated for, and even better results can be obtained. Can exert a sealing effect. In addition, this sealing material 8
also has the function of allowing slippage on the joint surface 14 and improving conformability. The same can be said of the deck surface of the cylinder block 12.

FIG. 5 shows a second embodiment of the invention. The features of this second embodiment are as follows. That is, in the first embodiment, only 6 ft of sub-plates were provided on both sides of the board 4 as shown in Figure 2.3, but in this second embodiment, as shown in Fig. 5, the sub-boards 4 and An intermediate plate 28 is provided between the plates 6. In other words, since the rA-zel engine is operated at a high compression ratio, it is necessary to have a high 7-ring efficiency, and a bead with extremely strong pressing force is required. For this reason, if there is only one sub-plate for each, the sealing line pressure of the bead will be strong and it will move in and out, making it difficult to generate smooth continuous surface pressure against the joint surface due to the ideal smooth / line line, resulting in a good seal line pressure. Seal effect cannot be obtained. Therefore,
An intermediate plate 28 is interposed between the substrate 4 and the sub-plate 6. The intermediate plate 28 also functions to adjust the distance between the cylinder head 10 and the cylinder block 12, and the compression ratio can be adjusted by adjusting the thickness of the intermediate plate 28. Note that the material of this intermediate plate 28 may be the same as that of the above-mentioned -plate 6, but especially when it is provided with only the function of adjusting the compression ratio, the material may be any material. Therefore, if the configuration is as in the above-mentioned I@2 embodiment, there will be no inconvenience of leakage even in a high compression ratio engine, and the compression ratio adjustment of the engine can be ideally performed.

In addition, in FIG. 5, the sealing material 8 is applied only to the more necessary joint surface ill of the -plate 6.

We are trying to simplify the configuration. Note that a plating layer 30 (see FIG. 6) may be provided on the lower layer of the sealing material 8, which is the surface of the sub-plate 6, and this plating layer 30 has a rust-preventing effect.
It is possible to prevent the cooling material from flowing, and to obtain good sliding and familiarity with the substrate 4 or the intermediate plate 28, thereby achieving an ideal sealing effect.

As is clear from the above explanation, according to the present invention, the hardness of the copper plate coated with the sealing material is made sufficiently softer than the hardness of the substrate, so that the melt fastening force is applied to the cylinder head side and the 7 cylinder block side. On the other hand, a continuous 7-line line can be made to appear with an average pressing force without being cut midway.

In addition, it efficiently compensates for all irregularities such as thermal distortion, tool marks, and scratches on the joint surface, allowing the bead to slide, ensuring good sealing performance, and preventing leaks such as in blowholes. As a result, the effect of fully exhibiting the sealing property is obtained. Moreover, this gold M4/l/skenod does not damage the cylinder head surface or cylinder block surface, and therefore, even after many years of use, the engine performance is maintained without any decrease in the l/l effect.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 to 4 show a first embodiment of the present invention. Figure 1 is a partially cutaway plan view of a metal gasket, and Figure 2 is an enlarged view taken along the line ■-■. 3 is an enlarged sectional view of the arrow m portion in FIG. 2, FIG. 4 is a schematic enlarged side view of the metal gasket, FIG. is an enlarged view of the main part showing another modification. In the figure, 2 is a metal gasket and 4 is a substrate. 6 is a sub-plate, 8 is a sealing material, and 10 is a cylinder head. 12 is a 7 cylinder pro, 14 is a joint surface, 16 is a bead, 18 is a cylinder hole, and 20 is an oil passage. 22 is a bolt hole, 24 is a top, 26-1, 26-2 is an end, 28 is an intermediate plate, and 3o is a plating layer. Figure 1 4 12 Figure 3 (3) 1/44 figure

Claims (1)

[Claims] Beads are formed on a substrate made of an elastic metal plate, a sealing material is applied to the surface of a sub-plate made of a plate material softer than the substrate, and the substrate and the sub-plate are laminated to form a gasket. Features a metal gasket.