JPH0733015Y2 - gasket - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, when two hollow members are fastened in a state in which they are in communication with each other, in order to seal the contact points of both hollow members, The present invention relates to an improvement of a gasket that is inserted between contact surfaces.

[Conventional technology]

This type of gasket is generally made of a hard material such as a metal plate, but if the force to pinch the gasket is weak or if the force to pinch the gasket is uneven, the sealing performance will be incomplete. There is a risk.

Therefore, as described in Japanese Utility Model Laid-Open No. 62-96163, at least one surface of a gasket body made of a hard material having a communication hole is surrounded by a soft seal material such as rubber to surround the communication hole. As described above, the sealability is improved by applying it by print printing. In that case, in order to improve the sealability by the soft sealant, the soft sealant is formed to a certain thickness. On the other hand, in printing by printing, there is a limit in the thickness dimension that can be applied by printing once, so conventionally, as shown in FIG. 6, the printing is performed at the same position on the gasket main body 11. On the surface of the gasket body 11
By applying the soft sealing materials 12 and 13 of the layers with the same width W, the thickness necessary to obtain an appropriate sealing property is ensured.

[Problems to be solved by the device]

By the way, the soft sealing material 12, 1 is made up of two layers in this way.
When 3 is applied, in order to improve the sealing property, both soft sealing materials 12 and 13 are easily crushed and deformed with a light force,
It is desirable that the width of the portion where the soft sealing materials 12 and 13 are overlapped be as narrow as possible.

However, it is difficult to accurately set the coating position by the coating by print printing, and as shown in FIG. 7, the positions of the upper and lower soft sealing materials 12 may be displaced. In the case where the upper and lower soft sealing materials 12 and 13 are formed to have the same width W, the width of the upper and lower soft sealing materials 12 and 13 should be appropriately adjusted in consideration of the positional deviation of the upper soft sealing material 12. The upper and lower soft seal materials can be made by forming a dimension much larger than the width dimension that can secure the sealing performance of
I had to make sure that 12 and 13 always overlap.

Therefore, when the upper soft sealing material 13 is largely displaced, the width W'of the upper and lower soft sealing materials 12 and 13 overlapping is reduced and the sealing property is improved, but the upper soft sealing material 13 is If there is no displacement, the width dimension W ', where the upper and lower soft sealing materials 12 and 13 overlap, becomes excessively large, and the sealing performance is significantly deteriorated. There is a problem in that a sufficient sealing property cannot be ensured because the soft sealing material 13 greatly changes depending on the deviation of the coating position.

Further, when the upper and lower soft seal materials 12, 13 are formed to have the same width W, the upper soft seal material 13 mainly adheres only to the lower soft seal material 12, but this kind of soft seal material There is also a problem in that the soft sealing material 13 in the upper layer is easily peeled off because it has a property that it has poor adhesiveness to a soft sealing material of the same kind that has been once hardened.

An object of the present invention is to provide a gasket capable of surely improving the sealing property and surely preventing peeling of the soft sealing material.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides a thin plate gasket body made of a hard material with a communicating hole of an appropriate shape, and at least one surface of the gasket body is provided with a soft sealing material of two upper and lower layers for communicating with each other. In the gasket formed by annularly coating so as to surround the holes, the width of the soft sealing material of the lower layer of the soft sealing materials of the two layers is narrow and the width of the soft sealing material of the upper layer is wide. It was configured to do.

[Function and effect of device]

According to this structure, since the upper soft sealing material is formed to have a wide width, even if the coating position of the upper soft sealing material is displaced, the lower soft sealing material is used for the lower layer regardless of the positional deviation. Since it is possible to cover the soft sealing material of, the total thickness dimension of the upper and lower soft sealing materials can be ensured to a dimension that can obtain an appropriate sealing property, and moreover, Since the lower soft sealing material has a narrow width, the upper soft sealing material covers the lower soft sealing material in a mountain-shaped cross section, and the width dimension of the portion where the upper and lower soft sealing materials overlap is always Since the width of the lower soft seal material is maintained to be approximately the same as the width of the soft seal material, the upper and lower soft seal materials can be crushed and deformed with a light force.

Therefore, according to the present invention, the upper and lower soft seal materials can be formed so as to be crushed and deformed with a light force regardless of the deviation of the coating positions of the upper and lower soft seal materials, so that the sealing performance of the gasket is ensured. Has the effect of being able to improve.

Moreover, both longitudinal edges of the upper layer soft sealing material will adhere to the gasket body while straddling the lower layer soft sealing material, and the upper layer soft sealing material will adhere directly to the gasket. The strength is remarkably improved, and it is possible to reliably prevent the defect that the upper soft sealing material is peeled off.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 5) when applied to a gasket for an internal combustion engine.
In the figure, reference numeral 1 is a cylinder block having a cooling water discharge hole 2 on its side surface, and reference numeral 3 is a cooling water outlet pipe with a collar 3a, which is fastened to the side surface of the cylinder block 1 with two bolts 4. Reference numeral 5 denotes a gasket inserted between the side surface of the cylinder block 1 and the flange 3a of the cooling water outlet pipe 3, respectively.

The gasket 5 includes a thin plate-shaped gasket body 6 formed of a hard material such as a metal plate. The gasket body 6 has a cooling water discharge hole 2 and a cooling water outlet pipe 3 in the cylinder block 1. A communication hole 7 is formed so as to communicate with each other. Further, one surface of the gasket body 6 is covered with two layers of upper and lower soft sealing materials 8 and 9 having heat resistance such as silicone rubber so as to surround the communication hole 7. In addition, it is formed by coating by printing or the like.

At this time, when the cooling water outlet pipe 3 is fastened to the cylinder block 1 with the two bolts 4, the width W1 of the lower soft seal material 8 of the upper and lower soft seal materials 8 and 9 is appropriately elastic. The width W2 of the upper soft seal material 9 is applied to the upper soft seal material 8b by print-printing as shown in FIG. Even if the position is deviated, the width is set to be wide so that the soft sealing material 8 in the lower layer is completely straddled and both longitudinal edges thereof are in close contact with the surface of the gasket body 6.

According to this structure, the upper soft seal material 9 always covers the lower soft seal material 8 regardless of the deviation of the coating position of the upper soft seal material 9, so that the seal is reliably performed. The thickness required to secure the thickness can be secured, and since the lower soft sealing material 8 is narrow, the upper soft sealing material 9 covers the lower soft sealing material 8 in a chevron cross section. Since the width dimension of the portion where the upper and lower soft seal materials 8 and 9 overlap is always maintained to be the same thin width dimension as the width dimension W'of the lower soft seal material 8, the upper and lower soft seal materials 8 and 9 are Since it can be crushed and deformed with a light force, therefore, even if the cooling water outlet pipe 3 and the cylinder block 1 are merely fastened with the two bolts 4, a reliable seal can be achieved. Of.

Moreover, the longitudinal side edges of the upper soft seal material 9 are
By directly adhering to the surface of the gasket body 6 across the lower layer soft seal material 8, the adhesive strength of the upper layer soft seal material 9 can be markedly improved, so that there is no problem that the upper layer soft seal material peels off. It can be prevented.

Although the above-mentioned embodiment is applied to the gasket for sealing the fastening portion between the cylinder block and the cooling water outlet pipe, it goes without saying that the present invention can be applied to a gasket in general, and two layers The soft seal material may be applied to both surfaces of the gasket body.

[Brief description of drawings]

FIG. 1 is an exploded view showing a gasket installation state, FIG. 2 is a view taken along line II-II in FIG. 1, FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2, and FIG. FIG. 5 is an enlarged cross-sectional view, FIG. 5 is a view showing a coated state of a soft sealing material, and FIGS. 6 and 7 are views showing a conventional technique. 1 ... Cylinder block, 3 ... Cooling water outlet pipe, 4 ... Bolt, 5 ... Gasket, 6 ... Gasket body, 7 ... Communication hole, 8 ... Lower layer soft sealing material,
9: Upper layer soft sealing material.

Claims (1)

[Scope of utility model registration request] 1. A thin-plate gasket body made of a hard material is provided with a communicating hole of an appropriate shape, and at least one surface of the gasket body is covered with two layers of upper and lower soft sealing materials so as to surround the communicating hole. In the gasket formed by coating in an annular shape, the width of the soft sealing material in the lower layer of the soft sealing materials of the two layers is narrow and the width of the soft sealing material in the upper layer is wide. Gasket to be used.