JPH09112700A - Core-fitted gasket and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the easiness in handling and heighten the sealing effect by providing an elastic sealing material in a single piece molding on a plate- shaped core material which is formed from a metal wire subjected to a compression processing along the shape of a gasket. SOLUTION: A wire of metal is bent in compliance with the shape of a gasket. This is subjected to a press working using a die so that part or the whole is put in a rolling process to form a plate-shaped core material a3. An elastic sealing material 2 is provided in a single piece molding on this core material a3. The core material a3 which has undergone rolling process maintains the shape of the gasket precisely owing to its sufficient rigidity to enable mounting on a cover member 3 in the engine assembly line by automated machine process. In mounting and fastening in a part to be sealed, the core a3 works to prevent the elastic sealing material 2 from deformation owing to the restraining effect of the adhesive surface having a large area, and permanent compressive strain of the sealing material 2 can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material for sealing a cover member and a block member in an engine mounted on an automobile or the like, and more specifically, to a gasket formed from the elastic sealing material and an insert material. The present invention relates to a structural improvement and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a gasket for sealing a cover member such as an engine head cover or an oil pan mounted on an automobile or the like has an annular shape formed of an elastic material such as synthetic rubber and having a cross section such as a corner or a round shape. Gaskets are known. These annular gaskets are press-fitted between members to be sealed by a tightening tool such as a bolt, and are brought into close contact with each other by their elastic repulsive force and compression deformation to exert the required sealing action.

[0003]

However, such an annular gasket has not been able to exhibit sufficient performance in spite of recent demands for weight reduction and perfect leakage prevention for a long period of time. In other words, the above-mentioned requirement is that the cover member is formed of a thin material or a lightweight weak-rigid material with an excessive amount of deformation in order to reduce the weight, and the weight and mass of the gasket tend to be reduced. Since it is a requirement to maintain strength, the actual response is extremely difficult. Further, in the engine assembly line, the mounting and mounting on the cover member is a great labor, and the automatic mounting is required. Hereinafter, this will be described in detail with reference to the drawings.

In such a situation, in order to improve the handling and wearability thereof, the utility model 63-2916 shown in FIG.
There is proposed a core material insertion gasket in which the core material (a1) is inserted in the central portion of the gasket (1) as disclosed in Japanese Patent Laid-Open No. 9-52, in which a part of the core material (a1) is a bolt. It is expected that the hole will be exposed outside the gasket (1) in a circular arc shape to prevent the deformation of the gasket (1) by twisting, maintaining the shape and holding the gasket (1) from the outside. ing. However, such a gasket (1) has a drawback that the compression characteristics are not a little different depending on the material of the core material (a1) contained therein, and it cannot exert a preferable effect on the sealing property. That is, it is unavoidable to increase the mass occupied by the core material (a1) in the gasket (1) in order to improve the handleability so that the shape of the gasket (1) can be accurately maintained. Is a core material having a circular cross-section (a
Since 1) is unavoidable, the core material (a1) reduces the elastic mass of the sealing material to reduce the allowable deformation amount, and the cross section of the gasket (1) is lumpy with respect to the thickness thereof. Therefore, there is a disadvantage that the whole shape must be thick, and since the core material (a1) has almost no compression surface against the tightening compression of the gasket (1), the sealing action does not work. It is also a cause of lowering durability. The present invention has been made in view of such drawbacks, and an object thereof is to provide a gasket having improved handleability and enhanced sealing action.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 4, the present invention is mounted between a cover member (3) and a block member (4) of an automobile engine or the like. An elastic sealing material (2) for sealing both members (3) and (4), for example, a cork material, a synthetic rubber, a synthetic resin alone or a mixture thereof, and a core material of a rigid material for reinforcing the same. A method of manufacturing a gasket containing a core material,
As shown in FIG. 1, a metal linear material (a2, which has a circular cross-sectional shape here) is made to follow the gasket shape, and this is rolled to form a plate-shaped core material (a3) as shown in FIG. The manufacturing method is characterized in that the elastic sealing material (2) is integrally molded with the plate-shaped core material (a3). Further, a gasket containing a core material, which comprises an elastic seal material (2) and a core material, wherein a metal linear material (a2) is made to follow the gasket shape as shown in FIGS. 5, 6 and 7. By using the plate-shaped core material (a3), (a32), or (a33) compressed and formed by using the plate-shaped core material (a3), (a32), or (a3)
It is characterized in that the elastic sealing material (2) is integrated with 3).

[0006]

According to the present invention, the above-mentioned structure has the following excellent effects. First, in the formation of the core material, as shown in FIG. 1, the linear material (a2) made of metal is bent along the shape of the gasket. Then, as shown in FIG. 2, the plate-shaped core material (a3) is formed by pressing a mold on the mold and rolling a part or all of the mold. In the case of a fine shape along the gasket, for example, a three-dimensional unevenness such as an arch portion or a hole closing portion, it is efficient to form at the same time, and a plate-shaped core material (a3) having a good finish can be obtained.

Next, in order to integrally mold the elastic sealing material (2) to the shaped plate-shaped core material (a3), the plate-shaped core material (a3) is put into a mold (not shown), A method of vulcanizing and molding the elastic sealing material (2) on the surface is generally used.
As a simpler method, both members (a3) and (2) are individually formed in advance, and these are fixed and integrated with an adhesive to obtain a gasket containing a core material. The core material-containing gasket of the present invention formed as described above has a high shape-maintaining property due to the rigid material contained therein, and has the rigidity when being transported, organized, or attached to the cover member (3). Since it can be grasped and transferred freely, it can be carried in and mounted by an automatic machine.

As shown in FIG. 4, the cored gasket of the present invention formed as described above is covered with a cover member (3) and a block member (4). (In many cases, a cylinder head cover and a cylinder head or an oil pan). And the cylinder block) and tighten the both members (3) and (4) with bolts (5), the elastic seal material (2) of the cored gasket is gradually compressed and begins to deform. At this time, the plate-shaped core material (a3) has a function of preventing the elastic sealing material (2) from being deformed by the restraining action of the adhesive surface having a large area, and suppresses the compression set. Of course, the plate-shaped core material (a3) itself is also a sufficient compression member due to the flat belt shape having a large compression receiving area, and the elastic seal material (2) is provided to the cover member (3) and the block member (4). Also works with high sealing power.

[0009]

EXAMPLES In carrying out the present invention, various shapes of the plate-shaped core material (a3) formed by rolling can be formed.
From a metal wire material (a2) having a round or square cross-sectional shape that is low in cost to a flat plate shape (a3) shown in FIG. 5, a saucer shape (a32) shown in FIG. 6, or a thickness difference shown in FIG. A complex shape such as the shape (a33) can be freely press-molded. This saucer shape (a32)
Then, the strength increases due to the uneven portion extending in the longitudinal direction,
Further, the uneven portion also suppresses the lateral flow deformation of the elastic sealing material (2) fixed thereto. The elastic sealing material (2) provided on the saucer-shaped core material (a32) is shown to be provided on one side in FIG. 6, but it is naturally possible to provide it on both upper and lower sides. Next, when the elastic seal material (2) is arranged in the thin thickness portion as shown in FIG. 7 in the different thickness shape (a33), the large thickness portion becomes an effective restricting material against compression, and the elastic seal material (2) has a certain thickness Will not be tightened.

Further, in the compression processing of the metal wire material (a2), as shown in FIG. 8, a part (a34) (a bolt for tightening in most cases) having a thicker part to the plate-shaped core material (a3) is formed. When the cover member (3) is attached, it is possible to cause a partial difference in the compression surface pressure of the gasket, and thus the bolt (5) is made thicker. In that case, the thick portion (a34) reduces the mass of the elastic sealing material (2) at that portion to generate high elasticity, and the portion between the bolts (5) of the cover member (3) is deformed due to strong tightening. Even if the remaining small surface pressure is left, a sealing surface pressure, which is the same as the vicinity of the bolt (5), is applied to the space between the bolts (5). The action of increasing the repulsive force of the elastic seal material (2) in the space between the bolts (5) also works effectively against compression set, and with the lapse of time in a uniform state, a high sealing force is exhibited for a long period of time. .

This plate-shaped core material (a3) has a circumferentially exposed portion as shown in FIG. 4, FIG. 5, FIG. 6, and FIG. In order to improve the automatic mounting in (3), it is possible to provide an extension part or a hole (neither is shown) in the main part.

[0012]

According to the present invention, the rolled plate-shaped core material (a3) maintains the gasket shape accurately due to its sufficient rigidity, and therefore, the cover member (3) in the engine assembly line. It is possible to install automatic machines on. In mounting and tightening at the sealed location, the plate-shaped core material (a3) does not function to prevent deformation of the elastic seal material (2) by restraining the adhesive surface of a large area, and compression of the elastic seal material (2). Suppress permanent distortion. Further, in the case of the cover member (3) which is lightweight and weak in deformation, the thickness of the plate-shaped core material (a3) can be partially changed and arranged. By doing so, the entire peripheral surface of the sealing surface can be obtained. Can be evenly tightened, and it is possible to prevent changes in surface pressure between the vicinity of the bolt (5) and the space between the bolts (5).

[Brief description of the drawings]

FIG. 1 is a perspective view showing a process of an embodiment of the present invention.

2 is a perspective view showing a process of the embodiment formed from FIG. 1. FIG.

FIG. 3 is a perspective view showing a process of the embodiment formed from FIG.

FIG. 4 is a sectional view showing a state in which the present invention is mounted.

FIG. 5 is a sectional view showing one embodiment of the present invention.

FIG. 6 is a sectional view showing one embodiment of the present invention.

FIG. 7 is a sectional view showing one embodiment of the present invention.

FIG. 8 is a side view showing another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional structure not using the present invention.

[Explanation of reference numerals] 1 gasket 2 elastic seal material 3 cover member 4 block member 5 bolt a1 core material a2 metal wire material a3 strip core material a32 saucer shape a33 different thickness shape a34 partially thick part

Claims (3)

[Claims] 1. A method for manufacturing a gasket with a core material, which is mounted between a cover member and a block member and comprises an elastic seal material and a core material that seals the both members, in which a metal having a round or square cross section is used. A core material, characterized in that a wire-shaped material is made to follow a gasket shape and a part or all of it is compressed to form a plate-shaped core material, and an elastic seal material is integrally molded with the plate-shaped core material. Manufacturing method of cored gasket. 2. A core-containing gasket, which is mounted between a cover member and a block member, and which seals the both members and comprises a core material, which is a metal wire material having a round or square cross section. A gasket containing a core material, characterized in that a plate-shaped core material formed by compression according to the gasket shape is used, and an elastic seal material is integrated with the plate-shaped core material. 3. When forming a plate-shaped core material by forming a metal wire material having a circular or square cross-section along a gasket shape and performing compression processing, a portion having a partially different thickness to the plate-shaped core material is formed. The method for producing a gasket containing a core material according to claim 1, wherein the gasket is formed.