JP2000266187A - Cover gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation, and to enhance seal performance by extending an inner peripheral part and an outer peripheral part of an insert material for arranging gaskets on upper/lower both surfaces, and respectively hookingly fastening/installing hooking parts having the tip parts mutually bent in the inverse direction to/on a side surface of a cover member and a side surface of a block member. SOLUTION: End parts of an insert material 3b being a reinforcing material are extended in the peripheral direction, hooking parts 3c are formed by bending these, a side surface of a cover member 1 and a side surface of a block member 2 are constricted by these hooking parts 3c at assembling installing time, a shape of the cover member 1 trying to be swollen and deformed is maintained by fastening pressure, and the hooking parts 3c of the insert material 3b formed by being mutually bent in the inverse direction operate to mutually pull mutual members 1, 2, particularly, the mating face part in the hook shape. When forming the insert material 3b in a closed loop shape along a mating face, since the closed loop shape itself becomes a strong structure, the hooking parts 3c can be arranged only on one side.

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 joint between a cover member of an engine mounted on an automobile or the like and a block member as a mating member. The present invention relates to an improvement in the shape of a cover gasket formed from an insert material having a shape.

[0002]

2. Description of the Related Art Conventionally, a gasket for sealing a cover member such as a head cover or an oil pan of an engine mounted on an automobile or the like has a square or round shape made of an elastic material such as synthetic rubber, cork or synthetic resin. Many annular gaskets having a cross-sectional shape are known. These annular gaskets are placed between the cover member and the block member and are tightened and mounted by a tightening tool such as a bolt. By the tightening, the annular gaskets are brought into close contact with each other with their compressive elastic deformation to exert a required sealing action. I have.

[0003]

However, such an annular gasket cannot meet various demands such as a demand for a lighter engine and a demand for simplification of mounting in recent years. In other words, in recent years, there has been an increase in the number of structures in which the cover member is formed of a synthetic resin material or a lightweight metal material due to requirements for weight reduction and molding efficiency or vibration damping properties. Tend to.
In such a light-weight cover member made of a synthetic resin or a light-weight metal, all the weight is applied to a small-area flange portion which is a mating surface with the block member, and the block member has an annular shape. When the cover member is tightened and mounted with the gasket interposed therebetween, the structurally weak portion of the flange (for example, the span portion of the tightening bolt) may lose the tightening pressure, and may be distorted and move sideways. Furthermore, in addition to the lateral relief movement, there is also a molding distortion occurring on the molding of the original cover member, and the amount of deformation is not negligible, and a measure for preventing deformation or maintaining the shape of the fundamental cover member is required. I have.

In addition, the gasket made of an elastic material such as synthetic rubber having a sufficient mass to enhance deformation adhesion has a problem that its shape cannot be properly maintained due to its softness, so that it is difficult to handle.
For example, there is a major difficulty in the workability of transporting or attaching to the cover member, and in an automobile assembly line, after attaching to the cover member, invert the cover member and assemble it,
In some cases, the gasket may be misaligned, the seal may be defective due to falling off, or the gasket may be more seriously damaged. Therefore, a simple and safe mounting structure has been required. Further, in recent years, there has been a demand for an automatic assembly of a gasket to a cover member using a robot or the like in an engine assembly line.

[0005] Under such circumstances, a cover member has been proposed in which an aperture is added to a portion where the strength is required or a reinforcing rib is added. However, a cover which has sufficient rigidity to satisfy a still strong tightening force has been proposed. No parts have been obtained. As for the gasket, a composite gasket in which an insert material is inserted and integrated has been devised, but this structure does not work in a direction to increase the sealing performance because the main focus is only on the handleability. The present invention has been made in view of the above-described drawbacks, and has as its object to provide a cover gasket that prevents deformation of the cover member, improves the handleability of the gasket, and improves the sealing performance.

[0006]

The present invention will be described with reference to the drawings. As shown in FIG. 1, a cover member 1 such as a head cover or an oil pan of an automobile engine and a block member 2 such as a cylinder head or a cylinder block are provided. The two members 1, 2
Cover gasket 3 made of an elastic gasket 3a made of synthetic rubber or synthetic resin or the like and an insert material 3b made of metal or hard synthetic resin for reinforcing the gasket 3a. The inner peripheral part and the outer peripheral part of the insert material 3b provided with are extended, and their tips are bent in opposite directions to form hook portions 3c. The hook portions 3c are respectively formed on the side surface and the block of the cover member 1. It is characterized in that it is hooked and mounted on the side surface of the member 2.

A cover gasket is mounted on the mating surface of the cover member 1 and the block member 2 and comprises an elastic gasket 3a compressed by the members 1 and 2 and an insert material 3b for reinforcing the gasket 3a. As shown in FIG. 5, the insert material 3b forms an annular closed loop shape along the mating surface, and gaskets 3a are provided on both upper and lower surfaces thereof.
One of the outer peripheral portions is extended and bent to form a hook portion 3c.
(The outer peripheral side is shown in FIG. 5), and the hook portion 3 is hooked on either the side surface of the cover member 1 or the lock member 2 and is fastened and mounted.

A hook 3d for engaging with the cover member 1 is formed at the tip of one of the hooks 3c for restraining the cover member 1 of the insert 3b, as shown in FIG.

[0009]

According to the present invention, as described above, the end of the insert material 3b, which is a reinforcing material, is extended in the circumferential direction, and is bent to form a hook portion 3c. And the side surface of the block member 2 is constrained to maintain the shape of the cover member 1 which is swelled and deformed by the tightening pressure. The hook portion 3c of the insert material 3b bent in the opposite directions is formed. The hook shape serves to pull the members 1 and 2, especially their mating surfaces. When the insert 3b has a closed loop shape along the mating surface, the closed loop shape itself becomes a strong structure, so that the hook portion 3c can be arranged on only one side.

As described above, when the cover member (1) is fixed at an appropriate position while maintaining its shape with respect to the block member 2,
The gasket 3a formed on the insert material 3b maintains a correct ground contact shape and adheres closely, and maintains a uniform surface pressure to exhibit stable sealing performance.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a cover gasket 3 according to the present invention has a gasket 3a which is in close contact with the mating surface of a cover member 1 and a block member 2 on both surfaces of an insert material 3b. Is formed by extending and bending inward and outward directions to form a hook portion 3c. In forming the laminated structure, a desired shape of the insert material 3b is prepared in advance by press molding or the like, and then a rubber or the like is formed. The gasket 3a is molded and integrated with the elastic body.

In the formation of the hook portion 3c, the cover portion is provided circumferentially on the insert material 3b or partially scattered at a key portion. In FIG. Although the structure in which the flange of the member 1 is hooked and fixed to the end face of the block member 2 is shown, various other shapes such as a twisted shape or a rib-shaped drawing process can be implemented. As an example, in order to have a hooking strength, a raised shape portion 31c in which a cut is made as shown in FIG. 3 to partially raise it or a cut piece is vertically bent as shown in FIG. The vertical claw-shaped portion 32c can be formed, and is selected according to the required situation and performance.

The insert material 3b may be provided in a closed loop shape as shown in FIG. 5. In this closed loop shape, the insert material 3 has a shape having a planar mass in an annular shape, so that the insert material 3b is not subjected to stress from its peripheral side. In contrast, the insert material 3 itself absorbs the tensile stress of the hook portion 3 provided on one of the peripheral surfaces, so that the other hook portion 3c can be omitted. It becomes possible.

Further, as a structure for temporarily fixing the cover gasket 3 to the cover member 1 and improving the assembling property to the block member 2, the cover member 1 of the insert member 3b is provided at one end of the hook portion 3c for restraining the cover member 1. As shown in FIG. 2, when the hook portion 3d that engages with the cover member 1 is formed, the hook portion 3d engages with the mating surface portion of the cover member 1 to be integrated, so that the mounting operation is performed by turning the cover member 1 upside down. Dramatically improved.

[0015]

According to the present invention, the insert member 3b has the rigidity of the cover member 1 and the block member 2 at the time of assembly.
And the shape of the cover member 1 is accurately maintained without allowing the shape deformation of the cover member 1 even under a strong tightening torque, and the gasket 3a can be brought into close contact with an appropriate position to exert a strong sealing force. In addition, insert material 3b
Is formed of a rigid material and has an extended portion, so that the cover gasket 3 can be prevented from being deformed, and can be transported by grasping the extended portion or automatically assembled by a machine. The cover gasket 3, which is properly mounted while maintaining the correct shape formed as described above, maintains a uniform surface pressure with respect to the tightening pressure, and promises high sealing performance and long-term durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounted state of the present invention.

FIG. 2 is a schematic enlarged sectional view showing another embodiment of the present invention.

FIG. 3 is a partial perspective view showing another embodiment of the present invention.

FIG. 4 is a partial perspective view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing an embodiment of another insert material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover member 2 Block member 3 Cover gasket 3a Gasket 3b Insert material 3c Hanging part 3d Hook part 31c Ridge shape part 32c Vertical nail shape part

Claims (3)

[Claims] 1. A cover gasket comprising an elastic gasket mounted on a mating surface of a cover member and a block member and compressed by the two members, and an insert material for reinforcing the gasket. The inner peripheral portion and the outer peripheral portion of the insert material provided with are extended, and their tips are bent in opposite directions to form hook portions. The hook portions are respectively provided on the side surface of the cover member and the side surface of the block member. A cover gasket characterized by being hooked and tightened. 2. A cover gasket, comprising a gasket made of an elastic body and mounted on a mating surface of a cover member and a block member and compressed by the two members, and an insert material for reinforcing the gasket. The gasket is provided on the upper and lower surfaces by forming a closed loop along the mating surface, and the peripheral surface of the insert material is extended and bent to form a hook portion, and the hook portion is formed by the side of the cover member or the lock member. A cover gasket characterized by being hooked on the side of a slab and tightened. 3. The cover gasket according to claim 1, wherein a hook portion for engaging with the cover member is formed at an end of a hook portion for restraining the cover member of the insert material.