JPH088336Y2 - Washer seal - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer mounted between a tightening tool and a fixing member, and more particularly to a washer seal having both sealing property and elasticity.

[0002]

2. Description of the Related Art Conventionally, to mount and fix a cover member such as an engine rocker cover or an oil pan,
Tightening tools are arranged in various places of the cover member, and tightening is performed together with a gasket fitted around the fastening members. The tightening tool and the cover member are used to seal the tightening tool and to prevent sound and vibrations of the cover member. A washer seal made of an elastic material is inserted between and. 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 (2) and a ring-shaped metal washer (1) are arranged above the elastic seal portion (2) to form a washer seal ( A1) is constituted by applying an appropriate tightening force to the bolt hole of the cover member to seal it and exerting a strong pressing force on the gasket arranged around the cover member.

[0004]

However, in such a washer seal (A1) which cannot regulate the lateral deformation in which the seal portion (2) radially deforms when compressed from above, It is not suitable for automated tightening in automobile engine lines. That is, the seal portion (2) made of an elastic body such as synthetic rubber has a certain width even if there is a slight difference in hardness, and the tightening torque is generally 20 kgf.
It is considered that the range is from cm to 80 kgf · cm, and if a load larger than this is applied to the seal portion (2), 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, and is one of the reasons for the inconvenience.

In order to eliminate such inconvenience, FIG.
A washer seal (A2) having a tray (3) capable of preventing lateral flow of the seal portion (2) as shown in Japanese Utility Model Laid-Open No. 57-83254 is developed, but rough tightening work is required in this structure. Due to this, the metal washer (1) and the tray (3) are displaced from each other and buffer each other, and the seal portion (2) loses its elasticity due to compression without escape and a new problem. There has occurred. In view of such a serious drawback, the present invention has an object to provide a seal washer having a self-regulating function that does not relieve stress and having a good sealing property that can withstand long-term use.

[0006]

As shown in FIG. 1, the present invention comprises a metal washer (1), an elastic seal portion (2) and a saucer (3), and a bolt through hole (4) is formed inside. )
A washer seal (A) comprising: a seal (2) sandwiched by a metal washer (1) located above and a saucer (3) having a cylindrical part (5) below. It is characterized in that a step portion (6) in which the central portion is depressed is formed on the bottom portion of the saucer (3) and the bottom portion of the seal portion (2) is fitted therein.

[0007]

The present invention has the following advantages due to the above structure. That is, according to the present invention, as shown in FIG. 1, the seal part (2) is sandwiched between the metal washer (1) and the saucer (3) from above and below, and the concave and convex step portions (6) of the saucer (3) are depressed. The seal portion (2) is fitted into the portion to perform tightening compression, and the fitting portion allows the seal portion (2) to be accurately positioned, and
The cylindrical portion (5) of the tray (3) receives the seal portion (2) that deforms and moves during compression on the inner peripheral side surface, and the elastic force thus received is accumulated on the outer peripheral portion of the step portion (6) by a spring action. . This elastic accumulation action prevents the stress relaxation of the seal portion (2) and obtains a good sealing property that can withstand long-term use.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When carrying out the present invention, it is essential that the seal portion (2) and the saucer (3) have a relationship that the seal portion (2) is fitted in the step portion (6) at the bottom thereof. For example, it is formed into a shape that allows accurate positioning, such as a tapered shape or a meshed shape. The shape of the stepped portion (6) is not limited to a circular shape and may be a polygonal shape or the like, and although it is not shown in the drawing, a corrugated shape in the circumferential direction may be used. It can exert the expected effect.

[0009]

With the above structure, the following excellent effects can be obtained. The washer seal (A) according to the present invention is such that each of the constituent members is placed in an accurate position and tightened, and even if there is a variation in the tightening pressure, the self-adjustment of the tray (3) and the step (6) is performed. Proper elasticity was always exerted on the seal part (2) by force, stress relaxation against excessive tightening pressure was prevented, and good sealability that withstands long-term use was obtained. Further, the spring action exerted by the stepped portion (6) of the receiving tray (3) has a high vibration absorbing action and dramatically improves the vibration damping performance.

[0010]

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view showing a state in which the structure of the present invention is mounted and compressed.

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

FIG. 4 is a cross-sectional view showing a conventional structure without using the present invention.

[0011]

[Explanation of symbols]

 1 Metal washer 2 Seal part 3 Saucet 4 Bolt through hole 5 Cylindrical part 6 Step part A Washer seal

Claims (1)

[Scope of utility model registration request] 1. A washer seal (A) comprising a metal washer (1), an elastic seal part (2) and a pan (3), and a bolt through hole (4) provided therein: 2) is sandwiched by a metal washer (1) located above and a saucer (3) having a cylindrical portion (5) below, and a step in which the center part is depressed at the bottom of this saucer (3). The part (6) is shaped, and the seal part (2) is fitted to the step part (6) to form the cylinder.
A washer seal, characterized in that a gap is provided between the portion (5) and the seal portion (2) .