JPH07332341A - Washer seal - Google Patents

Abstract

PURPOSE:To obtain a washer seal which is insertion-fitted between a tightening tool and a cover member and has the excellent tightening torque and is constituted so that a plurality of core members are used, together with a tightening regulating member. CONSTITUTION:A plurality of core members 1 having a compound layer 1a are laminated, and these core members 1 are formed integrally with a bush 2 at the height in contact with a tightening member. Accordingly, the excellent sealing performance and assembly performance can be provided.

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 tightening tool and a cover member, and more particularly to a washer seal having excellent sealing property and assembling property and having a very high tightening torque holding force.

[0002]

2. Description of the Related Art Conventionally, in order to mount and fix a cover member such as an engine rocker cover or an oil pan, a fastener is arranged at a required place of the cover member and a gasket mounted around the cover member is included. It is tightened and mounted, 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 protect the cover member from noise and vibration. There is. Hereinafter, a detailed description will be given with reference to the drawings.

In most of this structure, as shown in FIG. 4, a ring-shaped elastic seal portion 5 and a ring-shaped metal washer 6 are arranged above the seal portion 5 to form a washer seal. The bolt hole 3a of the cover member 3 is sealed by applying a sufficient tightening force thereto, and a strong tightening pressure is exerted on a gasket (not shown) arranged around the cover member 3. .

[0004]

However, in such a washer seal, when it is compressed from above, the seal portion 5 cannot regulate the lateral deformation in which the seal portion 5 radially flows and deforms. Not suitable for automated tightening on lines. That is, the seal portion 5 made of an elastic material such as synthetic rubber has a certain width with an optimum tightening pressure even though there is a slight difference in hardness. Generally, the tightening torque is 20 kgf · c.
It is considered that the range is from m to 80 kgf · cm, and if a load larger than this is applied to the seal portion 5, the torque is reduced (stress relaxation) or excessive lateral flow deformation causes destruction. Unfortunately, the automated assembly line is difficult to adjust within this range, which is one of the reasons for the inconvenience.

In order to eliminate such inconvenience, FIG.
As shown in Japanese Utility Model Laid-Open No. 57-83254, a washer seal having a tray 7 capable of preventing lateral flow of the seal portion 5 has been developed. However, in this structure, due to rough tightening work or excessive tightening pressure. The metal washer 6 and the tray 7 are displaced from each other to buffer each other, and the seal portion 5 loses its elasticity early due to the compression without escape, so that a good tightening torque cannot be maintained. Problem is occurring. In view of these drawbacks, the present invention has an object to provide a washer seal which prevents stress relaxation, improves vibration damping properties, and also has improved sealing performance.

[0006]

As shown in the drawings, the present invention is a washer seal for tightening a cover member 3 and sealing a bolt hole 3a in an automobile engine or the like.
A plurality of core materials 1 in which a compound layer 1a containing a fibrous material is formed on a metal ring are laminated, and a bush 2 for dimension control is fitted to the laminated core materials 1 to integrate them. I am trying. In this integration, in addition to a structure in which the core material 1 or the bush 2 is simply fixed by strong fitting, a fixing method such as partially crimping the core material 1 or the bush 2 or integrating them with an adhesive can be implemented. .

[0007]

The present invention has the above-mentioned structure and exhibits the following excellent effects. That is, as shown in FIG. 1 and FIG. 2, the core material 1 constituting the washer seal of the present invention is made of a compressible inorganic fiber or a fibrous material composed of a compressible inorganic fiber and a compressible organic fiber as an elastic material such as synthetic rubber. It is obtained by coating the surface of a metal ring with a compound layer mixed with the above.By mixing this fiber material and elastic material, the tightening load is large, it does not flow laterally even if a thermal load is applied, and it has an extremely high torque holding force. It also exhibits strong mechanical strength. A plurality of core materials 1 are laminated to have a volume capable of supporting a stronger tightening force. On the other hand, the bush 2 for constraining and integrating the core material 1 has a cylindrical shape shaped to have a height higher than the height of the laminated core material 1 and in contact with upper and lower tightening members. The bush 2 is fitted to the inner peripheral portion of the core material 1 to integrate them to complete a washer seal.

By stacking and stacking a plurality of core materials 1 having the above-described structure in the tightening direction as shown in the drawing, stress relaxation at the time of tightening is slightly suppressed, and stable and favorable without being influenced by the fluctuation of tightening load. It has high compression performance and high damping performance. At this time, the compound layer 1a made of an elastic material containing fibrous material formed on the surface of the core material 1 flexibly receives the tightening pressure and exerts an effective sealing property with the upper and lower contact members (4 and 3 in FIG. 2). Will be things. In the molding of the core material 1, a metal plate material having a compound layer 1a formed on its surface in advance is punched into a ring shape by a press machine, which is advantageous in terms of manufacturing cost because it can be formed in large quantities and at low cost. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS To implement the present invention, in the bush 2, the head of the bolt 4 located above and the member below (the cover member 3 in FIG. 2) are contacted, and the space between the two members 2 and 3 Since it plays a role in obtaining the best tightening torque by restricting the tightening dimension to a certain size, it requires sufficient shape maintaining strength to withstand strong tightening force, and metal, hard synthetic resin or similar rigidity. It must be formed from a material. In the integration of the bush 2 and the core material 1, as shown in FIG. 3, the core material 1, the bush 2, or both members 1 and 2 are partially provided with a caulking deformable portion 8 or they are integrated, or they are bonded together. Although it can be fixed by an agent, the simplest fixing method is to insert and mount the bush 2 into the inner peripheral portion of the core material 1, and the fixing method is selected according to various requirements or laminated thickness.

Examples of the fibrous material forming the present invention include, as the compressible inorganic fiber, glass fiber, ceramic fiber, rock wool, fused silica fiber, silica fiber, alumina fiber, zirconia fiber, whiskers, boron fiber and carbon fiber. , Metal fibers can be adopted, and as compressible organic fibers, polyamide fibers, polyolefin fibers, polyester fibers, polyacrylonitrile fibers, polyvinyl chloride fibers, phenol fibers, polyurethane fibers, cellulose fibers, etc. Can be used. Further, as the elastic material, a rubber material or a synthetic resin material having an appropriate elastic force and sealing property is used.

A graphite layer (not shown) may be adhered and molded on the surface of the compound layer 1a provided on the core material 1. In this structure, a high tightening load and a high heat load are involved. It is a preferable surface material because it does not stick to the contact member, maintains the unity property of the seal portion, and effectively transmits the clamping force to the core material 1. The unity of the seal portion by the graphite layer is such that even if the face materials are clamped and fixed to each other, the respective members are not physically adhered to each other. As shown in FIG. Since it has a larger vibration transmission loss, it has excellent vibration damping properties.

[0012]

With the above-described structure, the following excellent effects can be obtained. The washer seal according to the present invention has a large tightening load and a high torque holding force due to the strong compressibility of the compound layer 1a containing the fibrous material and the tightening dimension restriction action of the bush 2, and the axial force at the initial tightening is long-term. Keeps the seal surface pressure from decreasing. Therefore, there is no need for additional work such as retightening, and maintenance is excellent. In the molding, a core material portion as a base is punched and shaped, and a plurality of core materials 1 are constrained and integrated by a bush 2, so that mass production can be performed at an extremely low price.

[0013]

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a state in which the present invention is mounted.

FIG. 3 is a plan view of another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a mounted state of a conventional structure not using the present invention.

FIG. 5 is a cross-sectional view of a conventional structure that does not use the present invention.

[Explanation of symbols]

 1 core material 1a compound layer 2 bush 3 cover member 3a bolt hole 4 bolt 5 seal part 6 metal washer 7 saucer 8 deformation part

Claims (3)

[Claims] 1. A core material is formed by coating a surface layer of a metal ring with a compound layer in which a compressible inorganic fiber or a fiber material composed of a compressible inorganic fiber and a compressible organic fiber is mixed with an elastic material to form a core material. A plurality of layers, and a tubular bush having a height dimension higher than the height dimension of the laminated core material and in contact with the upper and lower tightening members is fitted to the inner peripheral portion of the core material. A washer seal characterized by being integrated. 2. The washer seal according to claim 1, wherein the laminated core material and the bush are integrated by partially crimping the core material or the bush. 3. The washer seal according to claim 1, wherein the core material is fixed to the bush by an adhesive.