JPH0641016Y2 - gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a gasket suitable for a cylinder head and the like, and more particularly to a soft gasket having improved sealing performance.

[Prior Art] Conventionally, as a metal / nonmetal composite type gasket used between a cylinder head and a cylinder block of an internal combustion engine, a filler made of asbestos or other various fibers is used as a binder for reinforcement and heat insulation. There is a gasket in which a joined soft sheet is reinforced with a metal reinforcing material such as a plate or a mesh. Such a gasket is used by being sandwiched between metal surfaces such as between the cylinder head and the cylinder block, and in order to prevent liquid leakage from the liquid hole part in them, the gasket around the liquid hole may be provided as necessary. A seal layer made of a soft coating layer is provided on the surface of the gasket body to improve the adhesion to the metal surface. for that reason,
This seal layer can prevent liquid leakage from the metal surface, but since the gasket body itself becomes porous to some extent due to the above-mentioned filling material etc., permeation leakage may occur from the liquid hole portion through the gasket body. There is.

[Problems to be Solved by the Invention] An object of the present invention is to prevent the permeation leakage that occurs through the gasket body in a porous state due to a filler or the like while maintaining the adhesion between the gasket body and the metal surface in the soft gasket. To obtain a gasket that is designed to prevent it.

[Means for Solving the Problems] In order to solve the above problems, the gasket of the present invention is a gasket used by being sandwiched between metal surfaces, and is a soft gasket main body formed by joining fillers with a binder. A seal layer made of a soft coating layer for adhering to a metal surface is provided on both the front and back surfaces around the liquid hole, and the gasket body has sufficient hardness to compress and deform the gasket body, The present invention is characterized in that annular sealing projections each having a cross section of a size capable of compressing and densifying the structure of the gasket body to suppress liquid penetration by press contact are provided.

[Operation] The annular sealing projection provided around the liquid hole of the gasket has sufficient hardness to compressively deform the gasket body, and compresses the tissue of the gasket body to such an extent that liquid permeation is suppressed. Since it has a cross section of a size that can be densified, when the gasket body is mounted between metal surfaces and tightened,
The protrusion is press-fitted into the gasket main body, and the portion of the gasket main body where the protrusion is press-fitted is compressed and densified to the extent that liquid permeation is suppressed, and liquid leakage is prevented.

In addition, since a sealing layer made of a soft coating layer is applied to the surface around the liquid hole so that the sealing layer adheres to the metal surface, the sealing effect of this sealing layer and the sealing ridge compresses the gasket body. With this, a synergistic effect with the sealing effect due to strong pressure contact with the metal surface ensures reliable sealing around the fluid hole.

[Embodiment] The drawings show an embodiment of the gasket according to the present invention, and Fig. 1 shows that the gasket 3 sandwiched between the cylinder head 1 and the cylinder block 2 is tightened by a tightening bolt (not shown) with a specified tightening force. At this time, the peripheral portion of the liquid hole 4 is shown by a cross section. Liquid hole 4
Are formed as water holes, oil holes, etc. of the cylinder head gasket.

FIG. 2 shows a state before the gasket 3 is tightened. The gasket 3 is adhered to the metal surface on both the front and back sheet surfaces around the liquid hole 4 in the soft sheet gasket body 5. A sealing layer made of a soft coating layer for improving the property is provided, an annular sealing projection 6 is provided, and a pair of gasket bodies 5 is provided with a shift preventing projection 8 on the front and back surfaces. It is constructed by joining both sides of the metal reinforcing material 7 that is formed.

The gasket body 5 is formed by binding a filler made of asbestos or other various fibers with a binder such as a rubber material for the purpose of reinforcement and heat insulation. Also, the gasket body 5 has an annular seal for sealing. The ridges 6 are made of a material having a hardness sufficient to compress and deform the gasket body 5 when it is tightened, for example, a resin slightly harder than the gasket body 5, such as epoxy resin, silicon resin, fluororesin, or hard rubber. Not only non-metallic materials such as quality materials,
It is necessary that the structure of the portion 5a of the gasket body 5 into which the ridge 6 is press-fitted can be compressed and densified to the extent that liquid permeation is suppressed when it is formed of a metal material having an appropriate hardness. It is configured as having a cross section of various sizes.

The sealing ridge 6 can be attached to the gasket body 5 by any means such as adhering or coating the ridge 6 on the surface of the gasket body 5.
Depends on the materials of the gasket body 5 and the ridges 6 and other various conditions, but is generally configured to compress the gasket body by about 5 to 30%. However, this compression range does not limit the present invention to the range.

Needless to say, the cross-sectional shape of the protrusion 6 is not limited to the illustrated shape.

Further, the embodiment shown in FIGS. 1 and 2 shows the case where the present invention is applied to a metal / nonmetal composite type gasket, but the above-mentioned embodiment is applied without using a reinforcing metal material. It can also be applied to a non-metal simplex type gasket composed of a soft sheet-shaped gasket similar to.

When the gasket 3 having the above-mentioned configuration is tightened by the tightening bolt with a specified tightening force, the protrusion 6 is press-fitted into the gasket body 5 by the tightening force, and as shown in FIG. A densified layer is formed by this, and thereby permeation leakage from the liquid hole 4 can be prevented. Further, since the surface of the gasket body 5 around the liquid hole 4 is provided with a seal layer made of a soft coating layer so as to be in close contact with the metal surface, the sealing effect of this seal layer and the above-mentioned sealing ridges are provided. Due to the synergistic effect of the sealing effect of 6 being strongly pressed against the metal surface as the gasket body 5 is compressed,
The sealing around the liquid hole 4 is also ensured.

[Advantages of the Invention] According to the gasket of the present invention as described above, a sealing layer made of a soft coating layer is provided on both front and back surfaces around the liquid hole in the gasket body, and the gasket body is compressed and deformed to prevent liquid leakage. Permeation leakage in the gasket body that is in a porous state due to the filling material, etc., while maintaining the adhesion between the gasket body and the metal surface, by the extremely simple means of providing an annular sealing protrusion that suppresses permeation Can be effectively prevented, and since the gaskets are compressed from both sides by providing the above-mentioned sealing ridges on both the front and back surfaces of the gasket body, gaskets that do not contain a reinforcing metal material can be used. Of course, even with a gasket containing a reinforcing metal material, the structure on both sides of the metal material is surely and locally compressed and deformed. The permeation of the fluid can be suppressed.

Furthermore, since the protrusions are provided on the surface of the gasket body to be pressed against the metal surface, the compression amount of the gasket body can be accurately grasped from the height of the protrusions. It is possible to accurately set the compression amount of the gasket main body to a required value in advance by the height.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing a usage state of an embodiment of a gasket according to the present invention, and FIG. 2 is a cross-sectional view of an essential part of the gasket in a usage state. 3 ... Gasket, 4 ... Liquid hole, 5 ... Gasket body, 6 ... Seal ridge.

Claims (1)

[Scope of utility model registration request] 1. A gasket to be used by being sandwiched between metal surfaces, which is used for closely adhering to a metal surface on both front and back surfaces around a liquid hole in a soft gasket body formed by binding a filler with a binder. In addition to providing a seal layer made of a soft coating layer, the gasket body has a hardness sufficient to cause compression deformation of the gasket body, and the structure of the gasket body is compressed and compressed to such a degree that the permeation of liquid is suppressed by pressure contact with the metal surface. Gasket characterized by protruding annular sealing protrusions each having a cross section of a size that can be realized.