JPH0754693Y2 - Rocker cover gasket - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket made of an elastic material used as a sealing material for an internal combustion engine of an automobile or the like, and more specifically, a rocker cover gasket mounted between a cylinder head and a rocker cover to seal those members. Regarding

[0002]

2. Description of the Related Art Conventionally, in the machining of a cam mounting portion of an engine cylinder head, a portion of an outer flange is penetrated and machined for ease of machining. Some means must be taken to block the hole. Hereinafter, a detailed description will be given with reference to the drawings.

In order to seal the processed hole (2), a semicircular padding having the same shape as the processed hole (2) is inserted and dealt with. Specifically, it has a desired thickness and elasticity. From the structure in which the semicircular packing is used together with the gasket, the rocker cover gasket (4) for sealing the rocker cover (7) as shown in FIG. There is a wide range of products, including those that have been made with the raised seal portion (3).

[0004]

However, the rocker cover gasket (4) integrally formed with the protruding seal portion (3) has an advantage of reducing the number of parts and improving the mountability. However, since they are integrated, the amount of compressive deformation is not uniform, the contact surface does not follow the entire surface of the cylinder head (1) accurately, and the conformability is remarkably inferior to the multi-component sealed body.

That is, as shown in FIG. 4, the rocker cover gasket (4) is mounted between the cylinder head (1) and the rocker cover (7), and the rocker cover gasket is compressed by a fastener. A portion of (4) close to the protruding seal portion (3) shows an action of flowing into the protruding seal portion (3) having a large deformation allowable mass, and therefore, both shoulder portions (31) of the protruding seal portion (3). ) Is pulled inward by this flow and extremely weakens the contact surface pressure at that part. In this case, the sealing force of both the shoulders (31) is equal, and the sealing performance is easily abandoned due to vibration or material deterioration.

An object of the present invention is to provide a rocker cover gasket which eliminates these drawbacks, greatly improves the fitting property and sealing property, and can withstand repeated use for a long period of time.

[0007]

As shown in FIG. 1, the present invention is directed to a cylinder head (1) in an engine of an automobile or the like.
Having a ring shape along the periphery of the cylinder head (1)
A locker made of an elastic material such as synthetic rubber in which a semicircular protruding seal portion (3) having substantially the same shape as the hole to be processed (2) is integrally provided at a location corresponding to the hole to be formed (2) formed in A cover gasket (4), wherein a recessed portion (5) is formed in the rocker cover gasket (4) in the vicinity of an end of the protruding seal portion (3) of a flat surface portion,
It is characterized in that a bead strip (6) extending to the bottom surface of the depressed portion (5) is provided on the sealing surface of the protruding seal portion (3).

[0008]

Operation: The rocker cover gasket (4) of the present invention is
As described above, the projecting seal portion (3) integrally provided with the recessed portions (5) from both ends thereof is provided on the flat portion thereof. As shown in FIG. 3, the recessed portion (5) is provided with the rocker cover (7) and the cylinder head ( 1) The rocker cover gasket (4), which is compressed and deformed when mounted between the two, tries to flow toward the shoulder portion (31) of the protruding seal portion (3) and is deformed. The depressed portion (5) whose mass is reduced by
Almost all of them are absorbed by and prevent the lateral flow and prevent the shape deformation.

This action is aided by the bead strips (6) provided on both shoulder surfaces of the protruding seal portion (3), and even if the amount of the bead is small, the compressive surface pressure of the shoulder portion (31) is increased by the flow movement. Even if the pressure drops, the bead line (6) connects from the bottom of the depression (5) to prevent the shoulder (31) from decreasing the surface pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In carrying out the present invention, it is extremely important to set the shapes of the depressions (5) and the bead strips (6) provided here because they are in a close relationship with each other, and the depressions. Depth, width or width of (5) and bead line (6)
The shape must be determined by adjusting the length, height, or number of each. Needless to say, the hardness, width and thickness of the rocker cover gasket (4) made of an elastic material are the basic elements for setting the shape.

[0011]

With the above structure, the following excellent effects can be obtained. The recessed portion (5) and the beaded strip (6) of the present invention provide optimum surface pressure not only for the flat surface portion and the protruding seal portion (3) of the rocker cover gasket (4) but also for the connection corner portion where the surface pressure is most difficult to obtain. It is a gasket that has a strong sealing performance without weakening. Further, preventing excessive deformation flow movement by the above action prevents breakage or breakage in advance and dramatically improves the durability of the material.

[0012]

[Brief description of drawings]

FIG. 1 is a bottom view showing an embodiment of a rocker cover gasket of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

FIG. 3 is an enlarged side view showing a state where the rocker cover gasket of the present invention is mounted.

FIG. 4 is a side view showing a conventional structure without using the present invention.

[0013]

[Explanation of symbols]

 1 Cylinder Head 2 Machining Hole 3 Convex Seal Part 31 Shoulder Part 4 Rocker Cover Gasket 5 Cavity Part 6 Bead Strip 7 Rocker Cover

Claims (1)

[Scope of utility model registration request] 1. A cylinder head (1) having a ring shape along the periphery thereof, and having a shape substantially the same as the hole (2) to be machined at a location corresponding to the machined hole (2) formed in the cylinder head (1). A rocker cover gasket (4) made of an elastic body integrally provided with a semi-circular convex seal portion (3); near the end of the convex seal portion (3) of the flat surface portion of the rocker cover gasket (4). A rocker cover gasket, characterized in that a recessed portion (5) is formed in the recess, and a bead strip (6) extending to the bottom surface of the recessed portion (5) is provided on the sealing surface of the protruding seal portion (3).