JPH10205515A - Washer seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing member inserted between a fastening tool and a cover member, producing a sealing action, and integrally mounted on the cover member while a seal ring holds a cylindrical metal ring, to thereby improve workability in assembling the cover member to a block member. SOLUTION: This washer seal mounted on a bolt fixing a cover member 1 and sealing the part has a press washer 4, a seal ring 3 and a cylindrical metal ring 2, the seal ring 3 having a projection 3a pressed on the outer surface of the cylindrical metal ring 2 on the inner peripheral surface thereof. This structure presses the projection 3a on the cylindrical metal ring 2 to integrate the washer seal and bulges an outer peripheral side surface corresponding to the projection 3a to press and fix it onto the bolt hole 1a of the cover member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material having a sealing function and mounted between a fastener and a cover member. And a washer seal that can obtain durability.

[0002]

2. Description of the Related Art Conventionally, in order to mount and fix a cover member (1) such as an engine rocker cover or an oil pan,
A fastener is disposed at a key position of the cover member (1) on which the gasket (6) is disposed, and the cover member (1) is tightened and mounted. The sealing of the fastener and the sealing of the cover member (1) are performed. A washer seal made of an elastic body is inserted between the fastener and the cover member (1) for sound and vibration proofing.

[0003] Most of this structure is such that a ring-shaped elastic seal portion (5) and a flat-ring-shaped metal press washer (4) are assembled above the seal portion (5). A sufficient tightening force is applied to the gasket (6), and a suitable surface pressure is applied to the gasket (6) disposed around the cover member (1) to provide good sealing with the block material (8). And a bolt hole (1a) which is a through hole for a bolt (7) for tightening the washer seal.
The sealing force was also applied to

[0004]

In a conventional washer seal in which a ring-shaped elastic seal member and a flat-ring-shaped metal washer ring are disposed above the seal member, However, when compressed from above, the seal portion is radially over-deformed, which is not suitable for automated mounting in a vehicle engine assembly line or the like. In other words, the seal portion made of an elastic material such as synthetic rubber has a certain fixed width for the optimum tightening pressure even though there is a slight difference in hardness.
It is considered that the range is from kgf · cm to 80 kgf · cm, and when a load more than that is applied to the seal portion, the torque is reduced (stress relaxation) or excessive lateral flow deformation causes sealing failure. In order to solve such inconveniences, a description will be given with reference to the drawings.
As disclosed in Japanese Patent No. 8635, a washer seal has been developed in which a presser washer (4), a cylindrical metal ring (2), and a ring-shaped seal portion (5) are combined to regulate a tightening dimension and adjust a tightening pressure. However, in this structure, it is necessary to perform a troublesome work of mounting and assembling the individual components on the cover member (1) at the time of mounting, and the provision of the assembled washer seal to the cover member (1) is temporary. The disadvantage remains that it cannot be engaged, and the possibility that a gap occurs when the bolt (7) is tightened and sealing failure occurs cannot be wiped out.

In view of the above drawbacks, the present invention prevents the gasket (6) attached to the cover member (1) from relaxing the stress, improves the vibration proof performance of the cover member (1), and enhances the sealing performance. It is intended to provide a washer seal.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a washer seal which is mounted on a bolt portion for fastening and fixing a cover member (1) and which seals a bolt hole (1a) thereof. Seal ring (3) molded and integrated with washer (4) on top
And a cylindrical metal ring (2) inserted into the inner periphery of the seal ring (3), and the outer surface of the cylindrical metal ring (2) is inserted into the inner periphery of the seal ring (3). And a projection (3a) that comes into pressure contact with the projection. Cover this washer seal with the cover member (1)
When the protrusion (3a) is attached to the cylindrical metal ring (2), the protrusion (3a) is brought into pressure contact with the cylindrical metal ring (2) and pushed back.
The cover member (1) is moved to the outer peripheral side surface corresponding to (a).
(3b) Raises the surface of the bolt hole (1a) beyond its diameter
It is characterized by the following.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has the following excellent functions with the above structure. That is, as shown in FIG. 1, the washer seal of the present invention is formed by integrally forming a seal ring (3) and a holding washer (4) which constitute a washer seal, and a cylinder is formed on an inner peripheral portion of the seal ring (3). A projection (3a) for attaching the metal ring (2) is provided. The arrangement of the projections (3a) to each member is such that the cylindrical metal ring (2) penetrating through the seal ring (3) can be held by its pressing force, and as shown in FIG. When the metal ring (2) is mounted on the seal ring (3), the protrusion (3a) is pushed back by the cylindrical metal ring (2) and the mass of the protrusion is transferred to the outer peripheral side surface corresponding to the protrusion (3a). Move to bolt hole (1a) of cover member (1)
The surface is raised (3b) beyond the diameter. In this state, the bulge (3b) is formed in the bolt hole (1) of the cover member (1).
The washer seal composed of a plurality of members is securely fixed and integrated with the cover member (1). In this situation, the outer peripheral surface of the seal ring (3) has a gentle bulge (3) that has little effect on the sealing performance due to the tightening deformation (radial deformation).
b) The shape of the bolt hole (1) of the cover member (1) is maintained.
The sealing of a) is ensured.

As shown in FIG. 1, the cover member (1) to which the washer seal is attached is mounted on the block member (8) with bolts (7) and around the gasket (6). After the seal ring (1) is tightened to a certain size, the lower end of the cylindrical metal ring (2) comes into contact with the surface of the block member (8). In this state, the tightening is hindered by the height of the cylindrical metal ring (2) located between the bolt (7) and the block member (8), and is deformed by excessive tightening pressure. Exhibits high mechanical strength without any further tightening and maintains accurate dimensions, thus providing proper tightening pressure to seal ring (3) and gasket (6).

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, a seal ring (3) of a washer seal is provided with a bolt hole (1) of a cover member (1).
a) has a shape that fits into the outer peripheral surface of the protrusion (3a) provided on the inner peripheral portion. It is important to adopt. The shape of the projection (3a) provided here satisfies the function of holding the cylindrical metal ring (2) and requires a mass to move and protrude to the outer peripheral side thereof. The minimum necessary protrusion degree is preferable in relation to the sealing performance and the conformability described later. As a matter of course, it is not advisable to arrange a large number of them in view of the degree of influence on the sealing performance and the ease of handling in the same manner as described above. In the drawings, a bolt hole (1a) and a washer seal are provided in the flange portion of the cover member (1) to perform edge tightening. However, a center tightening structure (shown in the drawing) in which these are provided near the center of the cover member (1). Is not possible).

[0010]

According to the above configuration, the following excellent effects can be obtained. The washer seal of the present invention
Presser washer (4) when attaching to cover member (1)
The seal ring (3) provided with the cover member (1) is integrally attached to the cover member (1) by a self-preventing action while holding the cylindrical metal ring (2), and the cover member (1) is assembled to the block member (8). We succeeded in dramatically improving the workability of attaching. The protrusions (3a) which act to prevent the inflow and outfall of the inside and outside have a gently raised (3b) shape on the outer peripheral surface, and fit well with the bolt holes (1a) so that the sealing performance thereof is not slightly reduced. In addition, the tightening pressure regulating material prevents an excessive torque from being tightened, provides an optimum tightening thickness to the seal ring (3) and the gasket (6), and exhibits a good sealing property, and prevents a stress relaxation to reduce a sealing surface thickness. It does not decrease for a long time. As described above, the cover member (1) can be mounted and tightened by the automatic assembly line, and the mounting process can be shortened.

[Brief description of the drawings]

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

FIG. 2 is a bottom view showing the operation of the embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional structure not using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover member 1a Bolt hole 2 Cylindrical metal ring 3 Seal ring 3a Projection 3b Ridge 4 Holding washer 5 Seal part 6 Gasket 7 Bolt 8 Block material

Claims (1)

[Claims] 1. A washer seal mounted on a bolt portion for tightening and fixing a cover member to seal the bolt hole portion, wherein the washer seal includes a cylindrical metal ring, a seal ring made of an elastic body, and a presser. A washer is provided on the top, the seal ring is molded and integrated by disposing the presser washer on the top, and a projection is provided on the inner periphery of the seal ring so as to protrude smaller than the outer diameter of the cylindrical metal ring. A cylindrical metal ring is inserted into the inner peripheral portion of the seal ring, and a partial mass is moved to the outer peripheral surface of the seal ring by pressure contact of the projection against the cylindrical metal ring, and the bolt hole diameter dimension of the cover member to be mounted is equal to or larger than A washer seal characterized by having its surface raised.