JPH0650383A - Vibration damping washer seal and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent stress relaxation and improve sealing performance by forming a compound layer made of synthetic rubber on a metal ring, coating the surface with a graphite layer, and superposing the metal rings on a receiving plate made of metal, and caulking the receiving plate mouth part. CONSTITUTION:Since a metal ring 1 has a compound layer 1b made of the synthetic resin compounded with inorganic or organic fibers as fillers, on both the surfaces, even if the tightening load is large and a thermal load, etc., are applied, the horizontal flow is made min., and the high torque holding force is developed. Since a metal ring 1c is used as core member, the stable sealing performance is secured with the storing mechanical strength. When a plurality of such metal rings 1 are superposed and formed integrally through the caulking of the receiving plate mouth part 21, the action of each metal ring 1 is improved proportionally, and the sealing performance which is independent from the dispersion of the tightening load can be developed. A graphite layer 1a does not adhere with a contact member, even in case of the high tightening load and thermal load, and the tightening force can be transmitted effectively to the compound layer 1b and the metal ring 1a.

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 fastening tool and a cover member, and more particularly to a vibration-damping washer seal having excellent sealing property and vibration-damping property, and a manufacturing method thereof.

[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 fastening tool is arranged at a required portion of the cover member, and the fastening is carried out together with a gasket mounted around the fastening tool. 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 protect the cover member from noise and vibration. Hereinafter, a detailed description will be given with reference to the drawings.

In most of this structure, as shown in FIG. 6, 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. Therefore, a suitable tightening force is applied to this to seal the bolt hole of the cover member, and a strong pressure is exerted on the gasket arranged around the cover member.

[0004]

However, in the case of the washer seal which cannot regulate the lateral deformation in which the seal portion 5 radially deforms when compressed from above, an engine assembly line for automobiles is required. It is not suitable for automated tightening such as tightening. 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 if there is a slight difference in hardness. Generally, the tightening torque is 20 kgf · cm to 8 kg.
It is considered that the range is 0 kgf · cm, and if a load larger than this is applied to the seal portion, 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. In this structure, a metal washer 6 and a metal washer 6 are formed by rough tightening work. New problems occurred such as displacement of the trays 7 caused by buffering each other and loss of elasticity of the seal portion 5 due to compression without escape. In view of these drawbacks, the present invention has an object to provide a washer seal that prevents stress relaxation, improves vibration damping properties, and improves sealing performance, and a manufacturing method thereof.

[0006]

The present invention will be described with reference to the drawings. As shown in FIGS. 1, 2 and 4, tightening of a cover member and sealing of bolt holes in an automobile engine or the like is performed. A washer seal, in which a metal ring 1c is provided with a compound layer 1b made of synthetic rubber in which inorganic fibers or organic fibers are mixed as a filler, and a graphite layer 1a is applied on the surface thereof to form an annular metal ring 1. Further, a plurality of the metal rings 1 are overlaid on the metal tray 2 and the tray opening 21 is caulked and deformed to form an integrated damping washer seal.

Further, a compound layer 1b made of synthetic rubber containing inorganic fibers or organic fibers as a filler is fixedly formed on the surface of the metal plate, and the graphite layer 1a is applied on the surface of the compound layer 1b. After forming the sealing plate material, the sealing plate material is punched to obtain an annular metal ring 1 having a metal ring 1c as a core material, and a plurality of the metal rings 1 are superposed on a metal saucer 2 to form a saucer mouth. It is characterized in that the portion 21 is caulked and fixed to manufacture a vibration damping washer seal.

[0008]

The present invention has the above-mentioned structure and exhibits the following excellent effects. That is, since the metal ring 1 constituting the vibration damping washer seal of the present invention has the compound layers 1b made of synthetic rubber formed on both surfaces thereof as shown in FIG. 3, the tightening load is large and thermal load is applied. Also has an extremely high torque holding force by minimizing the lateral flow, and has a strong mechanical strength and a stable sealing property because the metal ring 1c is used as the core material. When a plurality of metal rings 1 having such characteristics are overlapped as shown in FIG. 1 and integrated by caulking of the saucer mouth portion 21, each metal ring 1 improves its action proportionally and causes variation in tightening load. Stable and good sealing performance that is not affected. At this time, the graphite layer 1a does not stick to the contact member even with a high tightening load and a high heat load, and maintains the unity of the seal component, and effectively tightens the compound layer 1b and the metal ring 1a.
Tell to.

In the production of this vibration-damping washer seal, a metal plate having a compound layer 1b, a graphite layer 1a and the like formed on its surface in advance is punched into a ring shape, which can be formed in large quantities and at low cost, which is advantageous in terms of manufacturing cost. It will be Further, the integration is realized by mechanically caulking the saucer mouth portion 21, thereby shortening the manufacturing process.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In carrying out the present invention, in the caulking means in which a plurality of metal rings 1 are integrated, a structure in which a saucer mouth portion 21 as shown in FIGS. 1 and 2 is partially convexly deformed and fixed is convenient. However, other various caulking means such as a caulking projecting in a strip shape (not shown) or a projecting spiral and screwing together (not shown) are possible. In addition, if compatibility with the cover member, adhesion, etc. are required, as shown in FIG.
An elastic seal portion 3 made of synthetic rubber or the like is provided on the seat surface of the metal tray 2 as shown in FIG.
Various geometrical measures can be taken, such as providing a metal alone or a reinforcing seal ring 4 having an elastic body formed on the surface above the metal ring 1 that is heavily mounted.

[0011]

With the above-described structure, the following excellent effects can be obtained. The vibration-damping washer seal according to the present invention has a large tightening load, has a high torque holding force, maintains the axial force in the initial tightening, and does not reduce the seal surface pressure. Therefore, there is no need for additional work such as retightening, and maintenance is excellent. In the manufacturing method, the base seal portion is punched and shaped, and is caulked and deformed to be integrated, which enables mass production at an extremely low price.

[0012]

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view of a metal ring that constitutes the present invention.

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

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

FIG. 6 is a cross-sectional view of a conventional structure that does not use the present invention.

[0013]

[Explanation of symbols]

 1 Metal Ring 1a Graphite Layer 1b Compound Layer 1c Metal Ring 2 Metal Saucet 21 Saucet Portion 3 Elastic Seal Part 4 Reinforcement Seal Ring

Claims (4)

[Claims] 1. A metal ring 1c is provided with a compound layer 1b made of synthetic rubber in which inorganic fibers or organic fibers are mixed as a filler, and a graphite layer 1a is applied on the surface of the compound layer 1b to form an annular metal ring 1. A vibration-damping washer seal characterized in that a plurality of the metal rings 1 are superposed on a metal saucer 2 and the saucer mouth portion 21 is caulked and integrated. 2. A compound layer 1b made of synthetic rubber in which inorganic fibers or organic fibers are blended as a filler is fixedly formed on the surface of a metal plate, and the compound layer 1 is also formed.
After the graphite layer 1a is applied to the surface of b to form a sealing plate material, the sealing plate material is punched to obtain a metal ring 1 having a metal ring 1c as a core, and the metal ring 1 is provided with the metal ring 1 A method for manufacturing a vibration-damping washer seal, characterized in that a plurality of sheets are superposed and caulked and fixed at the pan mouth portion 21. 3. The vibration-damping washer seal according to claim 1, wherein an elastic seal portion 3 is provided on the seat surface of the metal tray 2. 4. The vibration-damping washer seal according to claim 1, wherein a reinforcing seal ring 4 is mounted above the metal ring 1 that is heavily mounted on the metal tray 2.