JPH10325467A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of rotation by improving the caulking strength of two metallic rings being securely caulked. SOLUTION: In a sealing device, a folding part 11f arranged at the cylinder part 11b of a reinforcing ring 11a (a first metallic ring) is folded in a manner to make contact with the end part of a cylinder part 13a of an inner annular member 12 (a second metal ring) and assembled by caulking and fixing. A recess 13c in which the folding part 11f is cut through by caulking fixing is formed in the end part of the cylinder part 13a of the inner annular member 12 with which the folding part makes contact.

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 for a shaft sealing portion of various devices, and more particularly to a technique for preventing rotation of two metal rings fixed by caulking.

[0002]

FIG. 4 shows a rubber lip 10 according to the prior art.
FIG. 2 is a diagram illustrating a cross-sectional configuration of a sealing device 101 including a resin lip 103 and a resin lip 103.

[0003] The schematic configuration of the sealing device 101 will be described. A rubber lip 102, a resin lip 103, and a dust lip 104 are fitted into an annular member 110 having a groove 111 for holding an O-ring 112 on the outer peripheral surface. It is fixed in a laminated manner by a radial portion 113 formed by the groove 111 and a caulking portion 114 at the end of the annular member 110.

[0004] Rubber lip 102 and dust lip 104
Is integrated with metal reinforcing rings 102a and 104a by vulcanization molding or the like prior to assembly of the sealing device 101. The resin lip 103 has a flat washer shape made of PTFE, and has a cylindrical jig having an outer diameter substantially the same as that of a shaft to be inserted after assembling. It is bent toward.

[0005] Reference numeral 201 denotes a housing member for fixing the sealing device 101, and 202 denotes a shaft inserted into the housing member 201, which is drawn by imaginary lines in this figure.

The sealing device 101 is provided with a rubber lip 102 on the sealing side M and a resin lip 103 on the atmosphere side O connected to the rubber lip 102 in order to prevent leakage of the sealing fluid on the sealing side M which is particularly high in pressure. It has a configuration.

[0007] The rubber lip 102 exerts sealing properties due to the force of the lip tip 102b against the sliding surface 203 (the outer peripheral surface of the shaft 202).

In addition, when the rubber lip 102 is deformed by the pressure on the sealing side M, the resin lip 103 comes into contact with the lip upper surface 103a against the lower surface of the rubber lip 102 and functions as a support portion for suppressing excessive deformation of the rubber lip 102. The sealing properties are exhibited by the sliding contact of the lip contact portion 103b with the sliding surface 203.

FIG. 5 is an explanatory view of a cross-sectional configuration of the sealing device 130 which can reduce the cost by changing the configuration while maintaining the function of the sealing device 101 of FIG. That is, the sealing device 101 of FIG.
10, an O-ring 112, a rubber lip 102, a resin lip 103, and a dust lip 104.
It is composed of three parts, a resin lip 132 and an inner annular member 133, and has a simple configuration with a reduced number of parts.

The outer annular member 131 has a metallic reinforcing ring 131a having an L-shaped cross section, and a rubber fitting part 131c and a radial part 13b are provided on the outer periphery of an axial part 131b of the reinforcing ring 131a.
1d is integrally formed with a rubber lip 131e.

The resin lip 132 has a flat washer shape made of PTFE like the resin lip 103, and has a cylindrical jig having an outer diameter substantially the same as that of a shaft to be inserted after assembly. To expand the inner diameter and bend toward the sealing side M.

The inner annular member 133 has an axial portion 133a fitted inside the axial portion 131b of the reinforcing ring 131a.
And an L-shaped metallic annular member having a radial portion 133b facing inward from the end on the sealing side M of the axial portion 133a.

The sealing device 130 is assembled by inserting the resin lip 132 and the inner annular member 133 inside the outer annular member 131 so that the axial portion 13 of the reinforcing ring 131a is inserted.
This is performed by bending the end 131f of the atmosphere side O of 1b inward and fixing it by caulking.

In the sealing device 130, the lip contact portion 132a of the resin lip 132 is
As shown in FIG. 5, the lack of flexibility compared to the lip tip of "e" causes "smearing" (slight leakage) of the sealed fluid in the area of contact with the sliding surface 203, as shown in FIG. Lip contact portion 132 of resin lip 132
A thread groove 132b is formed in the groove a to prevent leakage of the sealing fluid by operating a fluid pump function of moving the fluid existing at the boundary surface between the contact portion 132a and the sliding surface 203 by the rotation of the shaft 202. .

[0015]

By the way, with respect to the sealing devices 101 and 130 shown in FIGS.
As an example, the inner annular member 133 is fixed by being sandwiched between the resin lip 132 and the end 131f bent inward.

When the caulking is fixed by the end 131f,
Resin lip 132 and radial portion 131 of reinforcing ring 131a
A compressive stress is applied to the rubber portion 131g formed on the atmosphere side O of d, and the rubber portion 131g is pinched in a slightly thinner state than in a no-load state. Creep and a decrease in the repulsive force of the rubber portion 131g cause loosening of the caulking fixation, and the shaft 20
The resin lip 132 and the inner annular member 1
In some cases, a problem that the 33 rotates.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to improve the swaging strength of two metal rings fixed by swaging to prevent rotation. is there.

[0018]

According to the present invention, there is provided a first metal ring having a cylindrical portion and a flange portion bent radially from one end of the cylindrical portion. A second metal ring having a cylindrical portion fitted into the cylindrical portion of the first metal ring, and a flange portion bent radially from one end of the cylindrical portion; and the first and second metal rings. An annular lip member sandwiched between flange portions of the metal ring of
Assembling by bending a bent portion provided at the other end of the cylindrical portion of the first metal ring so as to be in contact with one end of the cylindrical portion of the second metal ring, and fixing by crimping. In the sealing device, the end of the cylindrical portion of the second metal ring with which the bent portion comes into contact is provided with a recess into which a portion of the bent portion is cut by caulking.

According to this structure, the second metal ring is prevented from rotating with respect to the first metal ring.

Further, the first metal ring has a rubber lip made of a rubber-like elastic material formed integrally with the first metal ring, and the annular lip member is made of a resin material. It is characterized by having a clamped portion clamped between the flange portions of the first and second metal rings, and a lip bent from the clamped portion in the axial direction.

Further, it is preferable that the flange portion of the second metal ring is provided with an engagement projection for preventing relative rotation between the second metal ring and the annular lip member. Rotation with respect to one metal ring is prevented.

[0022]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

FIGS. 1 and 2 show a sealing device according to a first embodiment of the present invention. FIG. 1 is a partial cross-sectional view showing a schematic configuration of the sealing device, and FIG. 2 is a schematic configuration cross-sectional view showing a use state in which the sealing device is assembled to a housing 80 and a shaft 70 is inserted.

As shown in FIG. 1A, the sealing device 1
An annular gap between the shaft 70 and the housing 80 having a cylindrical opening is sealed to prevent fluid such as oil on the sealed fluid side M from leaking to the atmosphere side O.

The schematic structure of the sealing device 1 is as follows.
It is composed of three parts: 1, a resin lip 12, and an inner annular member 13.

The outer annular member 11 has a reinforcing ring 11a having an L-shaped cross section as a first metal ring, a rubber fitting portion 11c on the outer periphery of a cylindrical portion 11b of the reinforcing ring 11a, and an inward flange portion 11d. Is integrally formed with a rubber lip 11e.

The resin lip 12 has a flat washer shape made of, for example, PTFE as a resin material. The resin lip 12 is formed by inserting a cylindrical jig having substantially the same outer diameter as the shaft 70 to be inserted after assembly. The inner diameter portion is expanded and bent toward the sealing side M.

Inner annular member 13 as second metal ring
Is an L-shaped metal ring having a cylindrical portion 13a fitted inside the cylindrical portion 11b of the reinforcing ring 11a and a flange portion 13b facing inward from an end of the cylindrical portion 13a on the sealing side M. is there.

Then, assembling of the sealing device 1 is performed by mounting the resin lip 12 and the inner annular member 13 inside the outer annular member 11.
And the end of the cylindrical portion 11b of the reinforcing ring 11a on the atmospheric side O is formed as a bent portion 11f, which is bent inward and fixed by caulking.

The lip contact portion 12a of the resin lip 12
As compared with the lip tip portion 11g of the rubber lip 11e, since the flexibility is poor, "smearing" (slight leakage) of the sealed fluid occurs in the contact area with the sliding surface 70a of the shaft 70. As shown, a screw groove 12b is formed in the lip contact portion 12a of the resin lip 12,
The fluid present at the boundary surface between the contact portion 12a and the sliding surface 70a is moved to the sealing side M by the rotation of the shaft 70 by operating the fluid pump to prevent leakage of the sealing fluid.

The lip tip 1 of the rubber lip 11e
A pump screw 11h is provided on a sliding surface of the 1 g of the shaft 70. The pump screw 11h has, for example, a C-shape to exhibit a pumping effect such that the fluid flows to the sealed fluid side M even when the shaft 70 rotates in any direction with respect to the sealing device 1. It has a structure.

Reference numeral 14 denotes a spring ring for applying a tension to the lip tip 11g.

FIG. 1B is an enlarged view of a portion D1 in FIG. 1A. As shown in this figure, the inner annular member 1
At the end of the cylindrical portion 13a, the bent portion 11f of the cylindrical portion 11b of the outer annular member 11 on the atmosphere side O is bent and fixed, and the bent portion 11f is inserted into the end of the cylindrical portion 13a. A recess 13c is provided.

A plurality of recesses 13c are provided in the cylindrical portion 13a, and in this embodiment, they are arc-shaped recesses. Then, the bent portion 11f is deformed and bitten into both ends of the recess 13c by the pressing force due to the caulking fixation (point K1).

Therefore, the relative rotation between the end face of the cylindrical portion 13a and the contact portion between the bent portion 11f and the rotation thereof is conventionally prevented, but the rotation is prevented by the mechanical fitting force. Even if compression creep occurs in the resin lip 12 due to aging or loosening occurs in crimping due to a decrease in the repulsive force of the rubber portion (reduction in frictional force), the inner annular member 13 is co-rotated with the rotation of the shaft 70. There is no turning around.

The flange 13 of the inner annular member 13
b, a spike-shaped engagement projection 13d for preventing relative rotation between the inner annular member 13 and the resin lip 12 is provided,
At the time of assembling the sealing device 1, the engagement protrusion 13 d is engaged so as to pierce the resin lip 12, thereby preventing the rotation of the resin lip 12.

FIG. 3 is a diagram showing a variation of the shape of the recess 13c. FIG. 3 (a) shows an arc-shaped recess 13c.
FIG. 3B shows a triangular recess 13e, and FIG. 3C shows a rectangular recess 13f. In addition, as long as a part of the bent portion 11f enters the recess, there is no problem with other shapes.

[0038]

According to the present invention, the first metal ring and the second metal ring can be firmly fixed by caulking, and even if caulking can be loosened due to aging of a member to be clamped. In addition, the second metal ring does not rotate with respect to the first metal ring.

When the engagement projection is provided on the flange portion of the second metal ring, rotation of the annular lip member can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sealing device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a state where the sealing device according to the embodiment of the present invention is assembled.

FIG. 3 is a diagram illustrating a variation of a recess according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional sealing device.

FIG. 5 is a cross-sectional view of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 11 Outer annular member 11a Reinforcing ring (1st metal ring) 11b Cylindrical part 11c Rubber fitting part 11d Flange part 11e Rubber lip 11f Bending part part 11g Lip tip part 11h Pump screw 12 Resin lip 12a Contact part 12b Screw Groove 13 Inner annular member (second metal ring) 13a Cylindrical portion 13b Flange portion 13c Depression 13d Projection 70 Shaft 70a Sliding surface 80 Housing M Sealed fluid side O Atmospheric side

Claims (3)

[Claims] A first metal ring having a cylindrical portion and a flange bent radially from one end of the cylindrical portion; and a cylindrical portion fitted to the cylindrical portion of the first metal ring. A second metal ring having a flange portion bent radially from one end of the cylindrical portion; and an annular lip member sandwiched between the flange portions of the first and second metal rings. Assembling by bending a bent portion provided at the other end of the cylindrical portion of the first metal ring so as to be in contact with one end of the cylindrical portion of the second metal ring, and fixing by crimping. The sealing device according to claim 1, wherein the end of the cylindrical portion of the second metal ring with which the bent portion comes into contact is provided with a recess into which a portion of the bent portion is cut by caulking. 2. The first metal ring includes a rubber lip made of a rubber-like elastic material formed integrally with the first metal ring, wherein the annular lip member is made of a resin material,
2. The sealing device according to claim 1, further comprising a clamped portion clamped between the flange portions of the first and second metal rings, and a lip bent from the clamped portion in an axial direction. 3. 3. A second metal ring is provided with a second flange.
The sealing device according to claim 1, further comprising an engagement protrusion for preventing relative rotation between the metal ring and the annular lip member.