JP2575076Y2 - 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 material mounted between a fastener and a cover member, and more particularly to a washer seal having excellent sealing and assembling properties and extremely high vibration damping characteristics.

[0002]

2. Description of the Related Art Conventionally, in order to mount and fix a cover member such as a rocker cover or an oil pan of an engine, a fastener is disposed at a necessary portion of the cover member and a gasket mounted around the cover member is included. A tightening mounting is performed, and a washer seal made of an elastic body is inserted between the tightening tool and the cover member in order to seal the tightening tool and to prevent sound and vibration of the cover member. Hereinafter, this will be described in detail with reference to the drawings.

[0003] In most of this structure, as shown in FIG. 4 , a ring-shaped elastic seal portion 8 and a ring-shaped metal washer 9 are disposed above the seal portion 8 to form a washer seal. In addition, a sufficient tightening force is applied to the cover member 10 to seal the bolt hole 10c of the cover member 10, and a strong pressure is applied to a gasket (not shown) disposed around the cover member 10.

[0004]

However, in a washer seal which cannot restrict lateral deformation in which the seal portion 8 is radially deformed when compressed from above, an engine assembly line for an automobile is known. Not suitable for making automated mounting of tightening in etc. That is, the seal portion 8 made of an elastic material such as synthetic rubber has a certain width for the optimum tightening pressure even though there is a slight difference in hardness, and the tightening torque is generally 20 kgf · cm to 8 kg.
It is considered that the range is 0 kgf · cm. If a load more than 0 kgf · cm is applied to the seal portion 8, the torque is reduced (stress relaxation) or excessive lateral flow deformation causes breakage. Unfortunately, the automated assembly line is difficult to adjust within this range, which is one of the reasons for the aforementioned disadvantages.

In order to eliminate such inconvenience, FIG.
As shown in Japanese Utility Model Application Laid-Open No. 57-83254, a washer seal having a saucer 11 capable of preventing a lateral flow of the seal portion 8 has been developed. New problems have arisen, such as the displacement of the tray 11 and the mutual cushioning of the tray 11 and the loss of elasticity of the seal portion 8 due to compression without escape. The present invention has been made in view of the above-described drawbacks, and has as its object to provide a washer seal that prevents stress relaxation, improves vibration isolation, and also enhances sealing performance.

[0006]

The present invention will be described with reference to the drawings . As shown in FIG. 1, there is provided a washer seal for tightening a cover member 10 and sealing a bolt hole 10c in an automobile engine or the like. And compound on both surfaces
It is characterized in that a plurality of core members 1 made of a metal ring having a layer 1a are laminated, and the outside of the plurality of core members 1 is covered with a synthetic rubber material 2 and integrated.

The synthetic rubber material 2 is characterized in that the core material 1 is integrated with the synthetic rubber material 2 by covering it.

[0008]

The present invention has the following excellent functions with the above structure. That is, the core material 1 constituting the washer seal of the present invention is made of a metal ring having a compound layer 1a made of synthetic rubber or the like on both sides as shown in FIG. 1, so that a tightening load is large and a thermal load or the like is reduced. It does not flow laterally even when it is applied, exhibits extremely high torque holding force, and has strong mechanical strength. On the other hand, the synthetic rubber material 2 is formed so as to cover the core material 1 and is integrated with the core material 1. The synthetic rubber material 2 comes into contact with the tightening bolt 5 or the cover member 10 to exhibit a stable sealing property. I do.

When a plurality of core materials 1 having such a structure are superposed as shown in FIG. 1 and integrated with a synthetic rubber material 2, the tightening characteristics of each core material 1 are improved in proportion, and the variation in the tightening load. Demonstrate stable and good compression performance and vibration damping performance not affected by U this time, the core 1 surface
The compound layer 1a flexibly receives the tightening pressure and exhibits an effective sealing property with the contact member.

In forming the washer seal,
Punching and forming a metal plate material having a compound layer 1a on both surfaces in a ring shape is advantageous in terms of manufacturing cost because it can be formed in large quantities and at low cost, and in integration, the core material 1 is made of synthetic rubber material 2 And integrated .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The compound layer 1 provided on the core 1
It is also possible to adhere and mold a graphite layer on the surface of a. With this structure, even with a high tightening load and a high thermal load, it does not stick to the contact member and keeps the unity of the seal part, effectively increasing the tightening force. Since it is transmitted to the core material 1, it is a preferable surface material.

[0012]

According to the above configuration, the following excellent effects can be obtained. The washer seal in the present invention has a large tightening load, has a high torque holding force,
Maintains the axial force at the beginning of tightening and does not lower the seal surface pressure. Therefore, there is no need for extra work such as retightening, and the maintenance is excellent. In the molding, a core portion as a base is punched and formed, and covered or engaged with an elastic material to be integrated, so that mass production can be performed at an extremely low price.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view illustrating a conventional structure without using the present invention;

FIG. 3 is a cross-sectional view of a conventional structure that does not use the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 1a Compound layer 2 Synthetic rubber material 5 Bolt 10 Cover member 10c Bolt hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A washer seal comprising: a plurality of core members each made of a metal ring having a compound layer on both surfaces thereof; and a plurality of core members covered with a synthetic rubber material to be integrated.