JP2596112Y2 - gasket - Google Patents

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 mating member in an engine mounted on an automobile or the like, and more specifically, to a shape of a gasket formed from the elastic body and an insert material. Regarding improvement.

[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 is an annular gasket formed of an elastic material such as synthetic rubber and having a square or round cross-sectional shape. It has been known. These annular gaskets are press-fitted between members to be sealed by a fastening tool such as a bolt, and their compression elastic deformation makes close contact with each other to exert a required sealing action.

[0003]

However, such an annular gasket cannot exhibit sufficient performance even under the recent demands for weight reduction and perfect long-term leakage prevention. That is, the demand is that the cover member is formed from a thin or soft material in which the deformation amount of the cover member is excessively large in order to reduce the weight, and the weight and mass of the gasket tend to be reduced, and the sealing force in the gasket for a long time is reduced. Because it is a requirement to maintain, the response is actually under extremely severe conditions. Further, in the assembly line of the engine, the mounting and mounting to the cover member is a great deal of trouble, and the automatic mounting is required. Less than,
This will be described in detail with reference to the drawings.

In such a situation, an insert material 8 is buried in a non-sealing portion of the gasket main body 7 as shown in FIG. An alternative structure has been proposed. However, this gasket cannot exert a useful effect other than obtaining rigidity by embedding the insert material 8 and maintaining its shape, and even if the insert material 8 is a non-seal part, it additionally has a seal part. However, since it is mounted with a reduced number, it has a drawback such as adversely affecting the sealing action. In view of these drawbacks, the present invention
It is an object of the present invention to provide a gasket that has improved handleability and also has enhanced sealing action.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 2, the present invention is mounted between a cover member 1 such as an automobile engine and a mating member 2, and 2. A gasket 3 made of an elastic body, such as cork material, synthetic rubber, or synthetic resin, which forms a hermetic seal 2. The gasket 3 is attached to all or a part of the gasket 3 as shown in FIG. The insert member 5 having a sufficient rigidity, which is formed into a gradually deformed shape having a thickness T2 at the space 5b between the bolts 4 and the thickness of the gasket 3, is thin.
It is characterized by being buried without altering its appearance.

[0006]

The present invention has the following excellent functions with the above structure. The gasket 3 of the present invention having the same thickness is mounted between the cover member 1 and the mating member 2 (often a cylinder head cover and a cylinder head or an oil pan and a cylinder block) as shown in FIG. When the two members 1 and 2 are tightened, the gasket 3 starts compressively deforming while gradually increasing the repulsive force. At this time, in order to receive the repulsive force, the cover member 1 reliably receives the repulsive force in the vicinity of the bolt 4 by the bolt 4, but the cover member 1 loses the repulsive force in the middle portion 5 b of the bolt 4, and the cover member 1 is distorted by all means. The tightening pressure is reduced as compared with the vicinity of the bolt 4 to reduce the seal surface pressure. However, in the space 5b between the fastening bolts 4 embedded in the gasket 3, the insert material 5 having a thickness T2 greater than T1 reduces the mass of the elastic body in this portion to generate high elasticity, and compensates for the small surface pressure. As a result, the same sealing surface pressure as that of the portion 5b near the bolt is applied to the portion 5a between the bolts. The action of increasing the repulsive force of the elastic body at the intermediate portion 4b of the bolt 4 also effectively works on the compression set, obtains a change over time in a uniform state, and shows a high sealing force for a long time. The insert member 5 maintains the shape of the gasket 3 accurately due to its great rigidity, thereby facilitating handling, for example, transporting or mounting work is extremely simple.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the present invention, it is advantageous in terms of formability and cost to form the insert material 5 from a material such as hard synthetic resin or synthetic rubber, but it is preferable to use a lightweight inorganic material or metal. It can also be formed from materials such as wood materials, etc., and can respond variously depending on the required performance. By combining the insert material 5 made of the woody material with the gasket 3 made of the same type of wood cork material, it becomes extremely advantageous for the recyclability after removal. Further, as shown in FIG. 3, the insert material 5 constituting the gasket 3 is removed from the gasket 3.
When the collar portion 5 is extended to the end, the rigidity of the insert portion makes it possible to reduce the tightening force between the cover member 1 and the mating member 2 to a fixed size. Reference numeral 5 denotes a shape having an exposed portion in a circumferential shape as shown in the figure, and an extended portion or a hole or the like in a main portion for improving storage or automatic conveyance by a machine and automatic mounting to the cover member 1 ( (Not shown ) can also be provided.

[0008]

According to the present invention, even if the cover member 1 has a light weight and a weak structure that is weak to deformation, the entire peripheral surface of the sealing surface of the gasket 3 is adjusted by the insert material 5 whose thickness is adjusted and rebound resilience is changed. Evenly tightened, near the bolt 5
b and the surface pressure of the interspace 5a is prevented from changing. Due to its great rigidity, the insert material 5 can accurately maintain the shape of the gasket 3 and, therefore, can be automatically mounted on the cover member 1 in an engine assembly line.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing a state where the present invention is mounted.

FIG. 4 is a cross-sectional view of a conventional structure that does not use the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover member 2 Mating member 3 Gasket 4 Bolt 5 Insert material 5a Near part 5b Interpart 6 Collar T1 Thickness near bolt T2 Thickness between bolts

Claims (2)

(57) [Scope of request for utility model registration] 1. A gasket 3, which is mounted between a cover member 1 and a mating member 2 and is made of an elastic body which seals the two members 1, 2, comprises a bolt for tightening all or a part of the gasket 3. The insert member 5 having rigidity, which is formed so as to be thin in the vicinity 5a of the bolt 4 and to be thick in the space 5b between the bolts 4 is gasket.
3 Gasket characterized by being buried without changing the thickness . 2. From the gasket 3 of the insert material 5.
The gasket of claim 1, wherein in that a collar 5 which can regulate the clamping dimension between the off site to the cover member 1 and the mating member 2.