JP3413457B2 - Washer seal mounting structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer seal mounted between a fastener and a fixing member, and more specifically, to uniformizing the surface pressure distribution of a cover member. The present invention relates to a mounting structure of a washer seal that prevents settling of a washer seal and a gasket and also provides good mounting workability and vibration isolation. 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 such as a bolt is provided at a necessary portion of the cover member and is mounted around the periphery thereof. Tightening is performed together with the gasket, and a washer seal made of an elastic body and a reinforcing material is mounted between the fastener and the cover member in order to prevent vibration of the cover member and seal the fastener . Hereinafter, a detailed description will be given with reference to the drawings. As shown in FIG. 3, most of this structure has a ring-shaped elastic body (4) and a ring-shaped metal washer (5) above the elastic body (4).
Are integrated to form a washer seal, which is attached to the cover member (2) together with the bolt (3),
By applying a tightening force to the bolt (3), the cover member (2) and the gasket (1) mounted on the cover member (2) are mounted and fixed to the cylinder head (6). [0004] However, in the mounting structure of the cover member (2) as shown in FIG. 3, the surface pressure required for the gasket (1) is reduced by the tightening pressure of the washer seal. The flatness of the contact surface of the flange (21) is important because it is applied to the flange (21) of the cover member (2). ) Is locally reduced to make the sealing force extremely unstable.
For this reason, a bolt (3) and a washer seal are arranged at a small interval with respect to the flange (21) to prevent distortion, or a reinforcing material (for example, a stiffener, which increases the strength of the flange (21) itself). (Not shown)), and other strength measures were required. Further, the elastic body (4) and the gasket (1) of the washer seal made of synthetic rubber or the like have an optimum tightening pressure having a certain width for maintaining the performance even if there is a slight difference in hardness. And generally has a tightening torque of 3
The range of 0 kgf · cm to 60 kgf · cm is considered to be in the range. When a load more than this is applied to the elastic body and the gasket (1) , the torque is reduced (stress relaxation), and the breakage is caused by excessive lateral flow deformation. Has danger. In view of such a serious drawback, the present invention provides a seal washer having a good vibration-proofing property, which applies a uniform surface pressure over a wide range to the gasket (1) to prevent stress relaxation of the washer seal and withstand long-term use. It is intended to provide a mounting structure. SUMMARY OF THE INVENTION The present invention relates to FIG. 1 and FIG.
As shown in (1), this is a mounting structure of a washer seal for mounting and fixing a cover member (2), wherein a sealing portion main body (7) is formed by an elastic body, and the sealing portion main body (7) is reinforced and both sides thereof are formed. with arranging the leaf spring (8) extending, provided the vibration absorbing pad (9) at both ends of the leaf spring (8), it is characterized in that attached to the flange portion of the cover member (2) (21). As described above, the present invention relates to a washer seal for mounting a cover member (2) on which a gasket (1) is mounted to a cylinder head (6) of an engine, as shown in FIG. The washer seal is the seal body (7)
And a leaf spring (8) serving also as a reinforcing plate of the seal body (7) and extending to both sides thereof, and vibration absorbing pads (9) disposed at both ends of the leaf spring (8). Seal part to bolt (3) of flange part (21) of cover member (2)
The main body (7) is attached, and the sealing portion main body (7) and the vibration absorbing pads (9) on both sides connected to the leaf spring (8) are separated from the flange portion (21) via the washer seal leaf spring (8).
Apply pressure contact to the surface . The plurality of compression applying portions are obtained by the tightening pressure of the bolt (3) at one place as described above, and the tightening pressure at the one place is evenly applied to the vibration absorbing pads (9) at both ends by the leaf spring (8). The flange (21) in the vicinity of the tightening portion and the wide range of gasket (1) located inside thereof are in a good tightening state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the present invention, the spring strength and extension of a leaf spring (8) extending from a reinforcing portion of a seal body (7) as shown in FIG. It is determined by the number of bolts (3) arranged around the member (2), the flange strength of the cover member (2), and the hardness of the seal body (7) and the vibration absorbing pad (9). However, in terms of the number of bolts to be provided, it is possible to reduce the number of bolts to at least about か ら to １ ／ of the number of bolts normally provided, due to a favorable tightening situation applied to the vicinity. Further, the flanges (2) of the plurality of vibration absorbing pads (9) are provided.
The tightening pressure applied to the seal body (7) dispersed by the contact with 1) can be maintained even if the tightening torque is about 70 kgf · cm to 90 kgf · cm with a pneumatic wrench or the like of an assembly line. It is distributed and distributed to about 50 kgf · cm to 60 kgf · cm, and does not generate torque reduction (stress relaxation) and excessive lateral flow deformation as in the past. According to the above configuration, the following excellent effects can be obtained. As described above, the washer seal of the present invention has a flange (2
A wide range of gaskets (1) located in the vicinity of the tightening of (1) and the inner part thereof are placed in a good tightening state, thereby preventing stress relaxation of the washer seal and providing an invariable tightening pressure to the gasket (1) for a long time. I do. In addition, the number of bolts to be provided can be reduced due to a favorable tightening condition exerted on the entire area near the tightening portion. This reduction in the number of bolts not only greatly improves the workability of mounting the cover member (2), but also reduces the weight of the engine itself. [0010]

[Brief description of the drawings] FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2 is a sectional view taken along line BB 'of FIG. FIG. 3 is a sectional view showing another embodiment of the present invention. [Explanation of symbols] 1 gasket 2 Cover member 21 Flange 3 bolts 4 Ring-shaped elastic body 5. Wheel-shaped metal washer 6 Engine cylinder head 7 Seal part body 8 leaf spring 9 Vibration absorbing pad

Claims (1)

(1) In a cover member to which a gasket is mounted, in a mounting structure of a washer seal used together with a bolt for mounting and fixing the cover member , the washer seal is elastic. a seal body composed of the body, a leaf spring which protraction on both sides serves as a reinforcing plate of the seal body consists vibration absorbing pad disposed at both ends of the leaf spring, which inner掴the gasket of the cover member Attach the seal body of the washer seal to the bolt of the flange portion with respect to the flange portion, and
The mounting structure of the washer seal, characterized in that the vibration-absorbing pad was pressed against the outer surface of the washer.