JPH0680020U - Washer seal - Google Patents

Abstract

(57) [Abstract] The present invention relates to a washer seal for fastening a cover member together with a bolt, and to a washer seal in which a compression escape portion is provided in an elastic portion to improve elastic characteristics and sealing performance. . A washer seal composed of a metal ring and an elastic seal ring, characterized in that a ring-shaped cavity is provided inside the seal ring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a washer seal used together with a fixture for mounting a cover member, and more specifically to a washer seal having both sealing performance and elastic characteristics.

[0002]

[Prior art]

 Conventionally, fastening tools such as bolts and nuts for fastening engine cover members, such as rocker covers and oil pans, have been used with washer seals made of an elastic body that has both sealing force and elastic force. The seal imparts an elastic force to the cover gasket that seals the hole portion through which the fastener passes and seals the cover member. The general structure of such a washer seal is to evenly transmit the tightening pressure to a wide area and to prevent the tightening nuts from directly contacting with each other so that they do not rotate together. A washer seal with a reinforcing ring is often used.

[0003]

[Problems to be solved by the device]

 However, when such a washer seal is mounted on the cover member and tightened, if the tightening load becomes excessive, the seal part made of an elastic material causes a lateral flow phenomenon that largely shifts its mass outward, and therefore the seal part is excessively deformed. In addition, cracks and fractures due to compressive fatigue tend to occur early, and elastic repulsion force is lost early. Further, even if it is prevented from such damage, the compression set cannot be prevented, the elasticity retaining property is deteriorated, and the damping property against vibration or sag of the gasket of the cover member cannot be exhibited. It has many drawbacks that must be taken.

A detailed description will be given below with reference to the drawings. In order to eliminate the above-mentioned drawbacks, as shown in FIG. 3, a tubular ring (4) is formed and fitted on the outer periphery of the seal part (5) to compress the compression deformation from the outer peripheral surface and to break it. Although a structure with durability against breakage has been proposed, it is natural that if the amount of deformation is suppressed, the original elasticity of the seal part (5) will be greatly lost, and the vibration absorption force will be lost. It becomes extremely weak, and the tightening force becomes excessive, and the resonance of the cover member is invited, resulting in an even worse situation. The purpose of the present invention is to eliminate all such serious drawbacks, and to provide a washer seal that achieves high sealing force and durability by performing strong tightening while retaining the rich repulsive force of the elastic body. .

[0005]

[Means for Solving the Problems]

 The present invention will be described with reference to the drawings. As shown in FIG. 2, a metal reinforcing ring (1) having a strong rigidity with a bolt hole arranged in the center and a metal reinforcing ring (1) below the metal reinforcing ring (1). A washer seal (A) comprising a seal ring (2) made of an elastic material such as synthetic rubber or synthetic resin, which is arranged in the cavity (3) having a ring-shaped space inside the seal ring (2). ) Is formed. Further, as shown in FIG. 1, the seal ring (2) has a divided structure of two members, and the cavity portion (3) is formed by a combination of uneven shapes of contact surfaces contacting the two members. .

[0006]

[Action]

 The present invention has the above-mentioned structure and performs the following excellent actions. That is, as shown in FIG. 4, the washer seal (A) attached to the cover member (B) together with the bolt (C) is tightened by the upper and lower members (B) and (C), and the seal ring (2) is compressed. Receiving elastic deformation begins. At this time, with the cavity (3) provided in the seal ring (2) as a boundary, the cushioning action of the cavity (3) causes the upper part and the lower part thereof to be separately tightened and compressively deformed, resulting in little deformation. Disperse the load in quantity and receive. The vicinity of the cavity (3) here escapes from the strongly compressed state due to the space space, and retains effective rebound resilience even when the tightening is completed.

[0007]

【Example】

 The characteristic structure of the present invention can include the cavity portion (3) provided in the seal ring (2), but the modeling structure forming the cavity portion (3) also has a great feature. That is, as a means for providing the hollow portion (3) in the seal ring (2), the divided structure of the seal ring (2) as shown in FIG. 1 is effective and simple, and the upper and lower concave and convex shapes are engraved. The combination enables many kinds of space modeling, and has an effective method of coping with each other, such as the structure of engaging with each other, even with respect to the disadvantage of the increase in the number of parts shown in FIG. It should be noted that the divided structure of the seal ring (2) allows the material and hardness of the elastic body itself to be changed, or a combination of different materials to be used, so that its practical application range is extremely wide.

Further, in the case where it is necessary to suppress the amount of deformation in one direction, it is possible to adopt a connecting structure of the seal ring (2) as shown in FIG. In addition to the structure to be arranged on the outside as described above, it is possible to select to arrange it on the inside or above or below. Of course, with respect to the shape of the hollow portion (3), various shapes such as a round shape, a triangular shape, a polygonal shape, or a combination thereof can be set according to the required performance, other than the illustrated shape.

[0009]

[Effect of device]

 As described above, according to the present invention, it is possible to maintain strong damping characteristics and rebound resilience without losing flexibility even under strong tightening and without breaking for a long period of time. This is a washer seal that exhibits ideal effects such as excellent vibration absorption and sealing performance for locations where vibrations and heat loads such as covers or oil pans are severe.

[0010]

[Brief description of drawings]

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

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

FIG. 3 is a cross-sectional view showing a conventional structure without using the present invention.

FIG. 4 is a sectional view showing a mounted state of the embodiment of the present invention.

[0011]

[Explanation of symbols]

 A Washer seal B Cover member C Bolt 1 Metal reinforcement ring 2 Seal ring 3 Cavity

Claims (2)

[Scope of utility model registration request] 1. A washer seal comprising a metal reinforcing ring having a bolt hole at the center and an elastic seal ring arranged below the metal ring, wherein a ring-shaped cavity is provided inside the seal ring. A washer seal characterized by forming a part. 2. The washer seal according to claim 1, wherein the seal ring has a divided structure of two members, and the hollow portion is formed by an uneven shape of a contact surface in contact with the two members.