JPH09210214A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the separation of a rubber-like elastic body by enhancing the strength to fix a rubber-like elastic body to a metallic ring. SOLUTION: A resin material 4 intervenes between a metallic ring 2 and a rubber-like elastic body 3. A protrusion 41 is provided in the resin material 4 so as to engage a detent hole 21 provided in a metallic ring 2. The resin material 4 is fixed to the metallic ring 2 by means of the protrusion 41, whereas the rubber-like elastic body 3 is bonded and fixed to the surface of the resin material 4. With this constitution, a shearing force applied to a portion between the metallic ring 2 and the rubber-like elastic body 3 is damped by the presence of the protrusion 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used in a region where high strength is required due to pressure or the like.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, one shown in FIG. 3 is known.

That is, the metal ring 100 and this metal ring 1
Rubber-like elastic body 101 for sealing, which is adhesively fixed to 00
And is composed of The rubber-like elastic body 101 is arranged so as to face the pressure fluid, and the metal ring 100 is arranged in the rubber-like elastic body 10.
1. The rubber-like elastic body 1 is located on the back side opposite to the pressure receiving side of 1.
The high pressure acting on 01 is backed up.

[0004]

However, in the case of the above-mentioned prior art, the rubber-like elastic body 10 is applied by pressure or the like.
The bonded portion between 1 and the metal ring 100 may peel off.

That is, the acting fluid pressure P increases the shearing force acting on the adhesive surface between the rubber-like elastic body 101 and the metal ring 100, and as shown in FIG.
The rubber-like elastic body 101 slides off and peels off at the end portion of. Possible causes are insufficient adhesive force between the rubber-like elastic body 101 and the metal ring 100, and deformation and fracture due to large elasticity of the rubber-like elastic body 101.

In particular, when the sealing lip portion 102 having a U-shaped cross section as shown in the drawing is provided, the fluid pressure P acts in the direction of expanding the lip portion 102 and the metal ring 10
The shearing force acting on the base portion of the lip portion 102 adhered to 0 increases, and peeling easily occurs.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to enhance the fixing strength of the rubber-like elastic body to the metal ring and prevent the peeling of the rubber-like elastic body. To provide a possible sealing device.

[0008]

In order to achieve the above object, in the present invention, there is provided a sealing device including a metal ring and a rubber elastic body for sealing fixed to the metal ring. , A resin material is interposed between the metal ring and the rubber-like elastic body, and a protrusion that engages with a locking hole formed in the metal ring is provided on the resin material, and the resin material is metalized through the protrusion. The rubber-like elastic body is fixed to the ring while being bonded and fixed to the surface of the resin material.

In the present invention, the shearing force acting between the metal ring and the rubber-like elastic body is suppressed by the projection between the resin material and the metal ring. Further, since the rubber-like elastic body is adhered and fixed to the resin material, the adhesive strength with respect to the resin material is higher than that with respect to the metal surface, and the resin material and the rubber-like elastic body do not peel off. In addition, since the resin material is softer than the metal ring, it is elastically deformed by the shearing force acting on the adhesion part with the rubber-like elastic body, and the shearing force acting on the adhesion part between the rubber-like elastic body and the resin material is buffered and peeled off. There is also an effect to prevent.

The materials of the rubber-like elastic body and the resin material are selected in consideration of compatibility with the adhesive.

By providing irregularities on the surface of the resin material, the adhesive strength between the rubber-like elastic body and the resin material can be further increased.

If the rubber-like elastic body is provided with an adhesive surface which is directly adhered and fixed to the metal ring, in addition to an adhesive surface which is adhered and fixed to the surface of the resin material, the adhesive strength of the rubber-like elastic body is increased. Can be further increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

1 (a) and 1 (b) show a sealing device according to an embodiment of the present invention.

The sealing device 1 is provided with a metal ring 2 and a rubber elastic body 3 for sealing which is fixed to the metal ring 2, and is used as, for example, a rod seal. That is, it seals the gap between the shaft hole 10a of the housing 10 and the shaft 11, and is mounted in the mounting groove 12 provided in the housing 10. The mounting groove 12 is configured such that one side surface in the axial direction is opened by the guide member 13.

The rubber-like elastic body 3 is a substantially U-shaped ring member that opens toward the axially sealed fluid side F, and the ring-shaped base 31 is provided on the inner and outer diameter sides toward the axially sealed fluid side. Lip portion 3 that is inclined and extends in the direction in which the gap gradually increases
2, 33 are provided, and the outer diameter side lip portion 33 has the mounting groove 12
The inner diameter side lip portion 32 slidably seals the outer peripheral surface of the shaft 11 in close contact with the bottom wall of the shaft 11.

On the other hand, the metal ring 2 has a flat washer shape and is integrally provided on the end face of the rubber-like elastic body 3 on the side opposite to the axially sealed fluid.

In the present invention, the resin material 4 is interposed between the metal ring 2 and the base portion 31 of the rubber-like elastic body 3, and the resin material 4 is engaged with the locking hole 21 provided in the metal ring 2. A protrusion 41 is provided, the resin material 4 is fixed to the metal ring 2 via the protrusion 41, and the base of the rubber-like elastic body 3 is adhesively fixed to the surface of the resin material 4.

The resin material 4 has a flat washer shape thinner than the metal ring 2 and is in close contact with the side surface of the metal ring 2 on the rubber-like elastic body side. A plurality of the locking holes 21 are provided in the circumferential direction on the contact surface of the metal ring 2 with the resin material 4, and the resin material 4 is also provided with a plurality of protrusions 41 corresponding to the locking holes 21. ing. Although the locking hole 21 is configured as a through hole in this embodiment, it may be an uncompleted hole having a bottom in some cases.

The metal ring 2 and the resin agent 4 are fixed by, for example, melting the resin and partially pouring the resin into the locking hole 21 of the metal ring 2 to integrate the resin, and then bonding and baking the rubber-like elastic body. It is suitable to carry out and mold.

Further, the surfaces of the rubber-like elastic body 3 and the resin material 4 are adhered and fixed by an adhesive. A material having a good compatibility with the adhesive is selected as the resin material 4, but a phenol-based resin is preferable in consideration of strength.

The surface of the resin material 4 to which the rubber-like elastic body 3 is adhered is provided with irregularities 42 to increase the adhesion area and to cause the adhesive surface of the rubber-like elastic body 3 to bite to enhance the adhesive strength. ing.

In the present invention, the shearing force acts between the metal ring 2 and the rubber-like elastic body 3 due to the fluid pressure acting on the rubber-like elastic body 3. In particular, the fluid pressure acting on the inner diameter side and outer diameter side lip portions 32 and 33 pulls the base portion 31 of the rubber-like elastic body 3 toward the inner diameter side and the outer diameter side to increase the shearing force. The force can be suppressed by mechanical engagement between the protrusion 41 between the resin material 4 and the metal ring 2 and the locking hole 21.

On the other hand, since the rubber-like elastic body 3 is adhered and fixed to the resin material 4, the adhesive strength to the resin material 4 is high,
No peeling occurs between the resin material 4 and the rubber-like elastic body 3. Also,
Since the resin material 4 is softer than the metal ring 2, the rubber-like elastic body 3
It is elastically deformed by the shearing force acting on the bonding portion between the rubber-like elastic body 3 and the resin material 4, and the shearing force acting on the bonding portion between the rubber-like elastic body 3 and the resin material 4 is buffered, which also has the effect of preventing peeling.

Further, since the unevenness 42 is provided on the surface of the resin material 4, the adhesive strength between the rubber-like elastic body 3 and the resin material 4 can be further increased.

Furthermore, since the adhesive is applied to both the metal ring 2 and the resin material 4, the rubber-like elastic body 3 is adhesively fixed not only with the resin material 4 but also with the metal ring 2. Therefore, the base 31 of the rubber-like elastic body 3 is provided with an adhesive surface that is directly adhesively fixed to the metal ring 2 in addition to an adhesive surface that is adhesively fixed to the surface of the resin material 4. Therefore, the adhesive strength of the rubber-like elastic body 3 is enhanced not only by the strength of the adhesive surface with the surface of the resin material 4 but also by the adhesive strength with the metal ring 2.

The width of the resin material 4 is, as shown in FIG.
It may be limited to a range that is larger than the inner diameter end of the metal ring 2 and smaller than the outer diameter end, and as shown in FIG. 1C, the inner diameter of the resin material 4 is set smaller than the inner diameter of the metal ring 2. The inner diameter end surface of the metal ring 2 may be covered with the inner diameter end of the resin material 4. By doing so, it is possible to prevent the rubber-like elastic body 3 from sliding down to the inner diameter end face side of the metal ring 2, and to effectively prevent the protruding damage.

Although not shown, the outer diameter of the resin material may be set larger than the outer diameter of the metal ring so as to cover the end surface of the outer diameter of the metal ring. Alternatively, the outer diameter of the resin material may be made larger than the outer diameter of the metal ring so that the resin material covers the inner and outer diameter end surfaces of the metal ring together.

In the embodiment shown in FIG. 1, the rod seal is used as an example, but the outer diameter lip portion may be used as the piston seal. Further, the sliding portion is not limited to reciprocating motion, and can be used as a rotating seal portion.

[Other Embodiments] FIG. 2 shows another embodiment of the present invention.

In this embodiment, the metal ring 220 has a stepped cylindrical shape and extends in the radial direction formed between the small diameter cylindrical portion 222, the large diameter cylindrical portion 223, and the small diameter cylindrical portion 222 and the large diameter cylindrical portion 223. And a flat annular step 224.

The rubber-like elastic body 230 is composed of the metal ring 220.
Which is bonded and fixed to the annular step portion 224 of the metal ring 22.
An annular base 231 that is adhesively fixed to an annular step 224 of 0.
And a lip portion 233 extending from the outer diameter end of the base portion 231 so as to gradually incline radially outward toward the axial sealed fluid side, and the lip portion 233 is an inner hole of the housing 210. 210a slidably sealingly contacts.

A corner portion with the large-diameter cylindrical portion 223 located at the outer diameter end of the annular step portion 224 is a rounded rounded portion 225, and the base portion 231 of the rubber-like elastic body 230 is bonded to the rounded portion 225. Has been done. A chamfer may be used instead of the rounded portion 225. In addition, the rubber-like elastic body 23
The inner diameter end side of the base portion 231 of 0 is adhered and fixed to the outer peripheral surface of the small diameter cylindrical portion 222.

Also in this embodiment, the resin material 240 is interposed between the annular step portion 224 of the metal ring 220 and the base portion 231 of the rubber-like elastic body 230, and the metal ring 2 is attached to the resin material 240.
A protrusion 241 that engages with a locking hole 221 provided in the annular step portion 224 of the 20 is provided, the resin material 240 is fixed to the metal ring 220 via the protrusion 241, and the base portion of the rubber-like elastic body 230 is further provided. 231 is adhesively fixed to the surface of the resin material 240.

The resin material 240 has a flat washer shape and is in close contact with the end face of the annular step 224 of the metal ring 220 on the sealed fluid side. A plurality of locking holes 241 are circumferentially provided on the contact surface of the metal ring 220 with the resin material 240, and a plurality of protrusions 241 are formed corresponding to the locking holes 221 that also penetrate the resin material 240. It is provided. Particularly, in this embodiment, the outer diameter end 243 of the resin material 240 is bent into an arc shape corresponding to the rounded portion 225 of the metal ring.

Further, the rubber-like elastic body 230 and the resin material 240
The surface is adhered and fixed by an adhesive, and the unevenness 242 is formed on the surface of the resin material 240 to which the rubber-like elastic body 230 is adhered.
Is provided to increase the adhesive area and to bite the adhesive surface of the rubber-like elastic body 230 to enhance the adhesive strength.

Also in this embodiment, due to the fluid pressure acting on the rubber-like elastic body 230, a shearing force acts between the metal ring 220 and the rubber-like elastic body 230. Particularly, due to the fluid pressure acting on the outer diameter side lip portion 233, the shearing force in the direction of being pulled toward the outer diameter side mainly acts on the base portion 231 of the rubber-like elastic body 230.
It is pressed by the protrusion 241 between the resin material 240 and the metal ring 220, and the base portion of the lip portion 233 of the rubber-like elastic body 230 is also prevented from protruding and being damaged.

On the other hand, the rubber-like elastic body 230 is made of a resin material 240.
Since it is adhesively fixed to the resin material 240, the adhesive strength to the resin material 240 is high and peeling between the resin material 240 and the rubber-like elastic body 230 does not occur. Further, since the resin material 240 is softer than the metal ring 220, it is elastically deformed by the shearing force acting on the adhesion portion between the rubber-like elastic body 230 and the shearing force acting on the adhesion portion between the rubber-like elastic body 230 and the resin material 240. Is buffered,
It also has the effect of preventing peeling.

Further, since the unevenness 242 is provided on the surface of the resin material 240, the rubber-like elastic body 230 and the resin material 240 are provided.
The adhesive strength between them can be further increased.

[0040]

As described above, according to the present invention,
The resin material is interposed between the metal ring and the rubber-like elastic body, and the resin material is provided with a protrusion that engages with the locking hole provided in the metal ring, and the resin material is fixed to the metal ring through this protrusion. On the other hand, since the rubber-like elastic body is adhered and fixed to the surface of the resin material, the shearing force acting between the metal ring and the rubber-like elastic body is suppressed by the protrusion between the resin material and the metal ring, and Since the elastic body is adhered and fixed to the resin material, the adhesive strength is higher than that of the conventional adhesion with a metal, and peeling of the rubbery elastic body can be effectively prevented.

If the surface of the resin material is provided with irregularities, the adhesive strength between the rubber-like elastic body and the resin material can be further increased.

Furthermore, if the rubber-like elastic body is provided with an adhesive surface that is directly adhered and fixed to the metal ring, in addition to the adhesive surface that is adhered and fixed to the surface of the resin material, the adhesive strength of the rubber-like elastic body. Can be further increased.

[Brief description of drawings]

FIG. 1 (a) is a longitudinal sectional view of a main part of a sealing device according to a first embodiment of the present invention, FIG. 1 (b) is a sectional view of the same usage state, and FIG. 1 (c) is a resin material. It is a principal part sectional drawing of the sealing device with which width differs.

FIG. 2 is a longitudinal sectional view of a main part of a sealing device according to another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 2 Metal ring 21 Locking hole 3 Rubber-like elastic body 31 Base part 32 Inner diameter side lip part 33 Outer diameter side lip part 4 Resin material 41 Protrusion 42 Unevenness 10 Housing 10a Shaft hole 11 Shaft 12 Mounting groove 13 Guide member 220 Metal Ring 221 Locking hole 222, 223 Small diameter, large diameter cylindrical portion 224 Annular step portion 225 Rounded portion 230 Rubber-like elastic body 231 Base portion 233 Lip portion 240 Resin material 241 Projection 242 Concavo-convex 243 Outer diameter end portion 210 Housing 210a Inner hole

Claims (3)

[Claims] 1. A sealing device comprising a metal ring and a rubber-like elastic body for sealing fixed to the metal ring, wherein a resin material is interposed between the metal ring and the rubber-like elastic body,
A protrusion that engages with a locking hole provided in the metal ring is provided on the resin material, and the resin material is fixed to the metal ring via the protrusion, while the rubber elastic body is bonded to the surface of the resin material. Sealing device characterized by being fixed. 2. The sealing device according to claim 1, wherein irregularities are provided on the surface of the resin material. 3. The rubber-like elastic body is provided with an adhesive surface which is directly adhered and fixed to a metal ring in addition to the adhesive surface when adhered and fixed to the surface of the resin material. The sealing device according to.