JP2562846Y2 - Laminated 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 many cases, as shown in Fig. 3, a ring-shaped elastic seal part (1) and a ring-shaped metal washer (2) are disposed above the seal part (1). A sufficient tightening force is applied to this to seal the bolt hole (3a) of the cover member (3), and a gasket (shown in the drawing) arranged around the contact portion of the cover member (3). No pressure).

[0004]

However, in a washer seal which cannot restrict lateral deformation in which the seal portion (1) radially flows and deforms when compressed from above, there is an automobile engine. It is not suitable for automated mounting of tightening on assembly lines. In other words, the sealing portion (1) made of an elastic material such as synthetic rubber has a certain fixed width for the optimum tightening pressure despite a slight difference in hardness, and generally has a tightening torque of 20 kgf.
・ Cm to 80 kgf · cm is considered to be in the range, and when a load more than that is applied to the seal portion (1), 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 Laid-Open No. 57-83254, a washer seal having a saucer (4) capable of preventing a lateral flow of the seal portion (1) has been developed. A misalignment between the metal washer (2) and the pan (4) occurs due to an improper tightening pressure, damping each other, and the seal (1) loses its elasticity by compression without escape. A new problem is occurring. 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 FIGS. 1 and 2, tightening of a cover member (3) and a bolt hole (3a) in an automobile engine or the like are performed. A plurality of core members (7) comprising a metal ring (6) or a metal ring (6) having a coating layer (6a), wherein the core member (7) is laminated. Is subjected to coining on the periphery thereof to form a recess (8) on the surface thereof.

In the formation of the recessed portion (8), depending on the requirement of the mounting location, the recessed portion (8) is provided on the outer peripheral portion of the core material (7) as shown in FIG. 1, or as shown in FIG. It is formed on the peripheral edge on the peripheral side.

[0008]

The present invention has the following excellent functions with the above structure. That is, as shown in FIGS. 1 and 2, the core material (7) constituting the laminated washer seal of the present invention includes a metal ring (6) or a coating layer (6) of a synthetic rubber or the like.
a) has a metal ring (6) having a large tightening load and does not flow laterally even when a thermal load or the like is applied.
It exhibits extremely high torque holding power, and
Has strong mechanical strength. Further, as shown in FIGS. 1 and 2, by superposing a plurality of pieces in the tightening direction, the tightening characteristics are improved in proportion, and stable and good compression performance and vibration damping performance which are not influenced by the variation of the tightening load can be exhibited.

As shown in the drawing, a recessed portion (8) is formed in the core material (7) by stamping, and when a laminated washer seal whose height is formed by pre-pressure marking is tightened, The contact area between the mating member, for example, the bolt (5) and the cover member (3) is reduced, but the surface pressure is increased, and in addition, a spring effect is generated due to the step of the concave portion (8), and the torque holding force is reduced. As a result, not only the width of the appropriate tightening pressure is increased, but also the vibration suppression characteristics that can be maintained are further enhanced.

At this time, when a coating layer (6a) made of an elastic synthetic rubber or the like is formed on the surface of the core material (7), the coating layer (6a) flexibly receives a tightening pressure and receives a contact member (each member). (Including the respective core members 7).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the present invention, in forming the recessed portion (8), a pressure is applied to a pair of dies to a plurality of superposed core members (7), and the outer peripheral edge or inner peripheral edge thereof is compressed and deformed. The molding time is short and easy to mold at once, but it is also possible to form by pressing and compressing when punching into a ring shape, and also to perform coining at the same time when multiple sheets are punched out. What is necessary is just to select the processing method according to required accuracy or required performance.

It is also possible to form a graphite layer (not shown) on the surface of the coating layer (6a) provided on the core material (7), and in this structure, a high tightening load and a high thermal load are required. Core material (7)
It is a preferred surface material because it is transmitted to The individuality of the seal portion by the graphite layer is such that even if the face materials are mutually fastened and fixed, they are not physically adhered to each other, and as shown in FIG. Since vibration transmission loss is larger than that of 1), it has excellent vibration damping properties.

In mounting the laminated washer seal, if the recessed portion (8) is provided on the inner peripheral side as shown in FIG. 2, the coating layer (6a) protrudes into the inner peripheral hole by coining. Formed (not shown), which provides another effect that can be a tether to integrate the bolt (5).

[0014]

According to the above configuration, the following excellent effects can be obtained. The laminated washer seal according to the present invention has a large tightening load due to holding of a high surface pressure, has a high torque holding force, maintains an axial force at the initial stage 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, since the core can be completed only by punching and shaping the base core portion and performing the coining process, mass production can be performed at an extremely low price.

[0015]

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing another embodiment of the present invention.

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

FIG. 4 is a sectional view showing another conventional structure that does not use the present invention.

[0016]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal part 2 Metal washer 3 Cover member 3a Bolt hole 5 Bolt 6 Metal ring 6a Coating layer 7 Core material 8 Depression

Claims (2)

(57) [Scope of request for utility model registration] 1. A laminated washer seal comprising a plurality of cores made of a metal ring or a metal ring having a coating layer formed thereon. In a laminated washer seal, the periphery of the laminated core material is stamped to form a recess on the surface. A laminated washer seal characterized by being formed. 2. The laminated washer seal according to claim 1, wherein the concave portion is formed in a peripheral portion on an inner peripheral side or an outer peripheral side.