JP2591396Y2 - Washer seal - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer seal used together with a fixture for mounting a cover member, and more particularly, to a washer seal having both sealing performance and elasticity.

[0002]

2. Description of the Related Art Conventionally, fastening members such as bolts and nuts for fastening a cover member of an engine, for example, a rocker cover or an oil pan, have been used together with a washer seal formed of an elastic material having both sealing force and elastic force. The washer seal imparts an elastic force to a cover gasket that seals a hole through which the fastener passes and seals the cover member. The general structure of such a washer seal is to transmit the tightening pressure evenly over a wide area, and to prevent the tightening nut and the like from directly contacting and rotating together. A washer seal provided with a reinforcing ring is widely used.

[0003]

However, when such a washer seal is mounted on the cover member and tightened, when the tightening load is excessive, the seal portion made of an elastic body largely shifts its mass outward. As a result, cracks or fractures due to compression fatigue are likely to occur in the excessively deformed seal portion at an early stage, and the elastic repulsive force is lost at an early stage. In addition, even if it is possible to prevent such a failure, permanent compression set cannot be prevented, elasticity retention is reduced, and damping properties cannot be exhibited against vibration or settling of the gasket of the cover member. Has many disadvantages that must not be.

The details will be described below with reference to the drawings. In order to solve the above-mentioned drawbacks, as shown in FIG. 2 , a cylindrical ring (4) is formed and fitted on the outer periphery of the seal portion (5) to press the compressive deformation from the outer peripheral surface to break it. However, if the amount of deformation is suppressed, the original elasticity of the seal portion (5) is naturally largely lost, and the vibration absorbing force is extremely weak. As a result, the tightening force becomes excessive and resonance of the cover member is induced, so that the situation becomes worse. It is an object of the present invention to provide a washer seal that eliminates all such serious drawbacks and achieves a high sealing force and durability by performing strong tightening while maintaining the rich repulsive force of an elastic body.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to the drawings . As shown in FIG. 1 , a metal reinforcing ring (1) having strong rigidity and having a bolt hole disposed in the center thereof, A washer seal (A) comprising a seal ring (2) made of an elastic material such as synthetic rubber or synthetic resin disposed below the reinforcing ring (1) made of a material.
Has a two-member split structure, and these two members touch each other
Ring shape with contact surface with irregularities and isolated from outside
(3) is formed.

[0006]

The present invention has the above-mentioned structure, and performs the following excellent functions. That is, as shown in FIG. 3 , the washer seal (A) attached to the cover member (B) together with the bolt (C) is composed of its upper and lower members (B).
(C), the seal ring (2) is compressed and starts elastically deforming. At this time, the upper and lower portions of the cavity (3) are cushioned by the cavity (3), separated from other members by the seal ring (2) provided in the seal ring (2) . Each is separately tightened and deformed by compression, and the load is dispersed and received with a small amount of deformation. The portion in the vicinity of the hollow portion (3) here escapes from the strongly compressed state due to the space, and retains effective rebound resilience even when the tightening is completed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The characteristic structure of the present invention is a seal ring (2).
There is a cavity (3) provided inside and separated from other members, but the molding structure for forming the cavity (3) also has a great feature. That is, the means for providing the hollow portion (3) in the seal ring (2) is effective and simple in the structure of dividing the seal ring (2) as shown in FIG. Many types of space modeling are enabled by the combination, and there is an effective method of coping with the disadvantage such as an increase in the number of parts shown in FIG.
In the divided structure of the seal ring (2), the material and hardness of the elastic body itself can be changed, or a combination of different materials can be used.

Of course, as for the shape of the cavity (3), various shapes other than those shown can be set according to the required performance, such as a round shape, a triangular shape, a polygonal shape, or a combination thereof.

[0009]

[Effect of the invention] As described above, according to the invention,
It retains strong damping characteristics and rebound resilience without losing its flexibility even under strong tightening, and is not destroyed for a long period of time. It can be used in places where there are severe vibrations and heat loads such as engine rocker covers or oil pans. It is a washer seal that exhibits ideal working effects, such as showing excellent vibration absorption and sealing power.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional structure without using the present invention.
It is.

FIG. 3 is a cross-sectional view showing a mounted state of the embodiment of the present invention;
You.

[Explanation of symbols]

 Reference Signs List A Washer seal B Cover member C Bolt 1 Metal reinforcing ring 2 Seal ring 3 Cavity

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-121160 (JP, A) JP-A-57-154560 (JP, A) Fully open Showa 60-8543 (JP, U) Really open Showa 59- 85410 (JP, U) Japanese Utility Model Showa 62-93416 (JP, U) Japanese Utility Model Showa 61-1712 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16B 43/00 F16F 15 / 08

Claims (1)

(57) [Scope of request for utility model registration] 1. A washer seal comprising a metal reinforcing ring having a bolt hole at a central portion and an elastic seal ring disposed below the metal reinforcing ring , wherein the seal ring is divided into two members. This structure has two parts
The contact surfaces of the materials that are in contact with each other
Characterized by forming an extinct ring-shaped cavity
Washers seals.