JPH08210513A - Sealing device - Google Patents

Abstract

PURPOSE: To provide a sealing device which can maintain mounting stability while saving a space. CONSTITUTION: A sealing device is provided with a lip part 1 slidably touching a shaft 10 and a metallic ring 3, which supports the lip part 1, is mounted in a housing 11 which is relatively movable with the shaft 10, and serves as a circular member, and in the metallic ring 3, a mounting part with the housing 11 is formed thinly in the axial direction and plural projections 7 are arranged on the outer circumference side in the radius direction, while in the housing 11, a rotational groove 9, in which the projections 7 are rotated around the shaft and can be engaged, is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device such as an oil seal.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, one shown in FIG. 6 is known.

In FIG. 6, a sealing device A'is a lip portion 101 made of a rubber-like elastic body that slidably contacts a shaft 110 and seals a fluid to be sealed, and the lip portion 101 is integrally molded and fitted into a housing 111 or the like. A fitting part 102 to be fitted,
Further, a dust seal lip 105, which is formed integrally with the lip portion 101 and the fitting portion 102, is provided on the side opposite to the fluid to be sealed in the axial direction to prevent dust and the like from mixing, and supports these rubber-like elastic members. And a shaft 11 provided on the outer peripheral side of the lip portion 101.
And a spring 104 for adjusting the pressing force between the spring 104 and the spring.

The housing 111 to which the sealing device A'is mounted and the shaft 110 can move relative to each other. For example, even if the two members relatively rotate and reciprocate, the fluid to be sealed leaks. It was sealed without any.

In addition, in the sealing device A ', when the housing 111 and the shaft 110 are mounted, the axial length L of the fitting portion 102 is determined in consideration of stability and safety of the mounting position. The length is required depending on the radial length of the sealing device A ′, the size of the lip portion 101, and the like.

[0006]

However, in the above-described conventional sealing device A ', the axial length L of the fitting portion 102, when mounted in the housing, secures the volume of the fluid to be sealed, and the other members. It is preferably as short as possible in order to prevent interference.

Particularly in recent years, when downsizing and weight reduction are required, the downsizing of the housing 111 is also progressing,
Similarly, the sealing device A ′ to be mounted needs to be downsized and save space.

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 provide a sealing device capable of maintaining mounting stability and saving space.

[0009]

In order to achieve the above object, according to the present invention, a lip portion slidably contacting a shaft and an annular member mounted on a housing supporting the lip portion and movable relative to the shaft. In the sealing device having, the annular member has a portion to be attached to the housing formed thin in the axial direction, and a plurality of protrusions are provided on an outer peripheral side in the radial direction, and the housing is rotated around the protrusion as an axial center. It is characterized in that a rotation groove that can be locked is provided.

The width of the rotating groove may be gradually narrowed as the rotation angle increases.

[0011]

According to the sealing device constructed as described above, since the annular member has the axially thin mounting portion with the housing, there is no portion to be fitted to the inner circumference of the housing, and the outer circumference in the radial direction is eliminated. Since the plurality of protrusions are provided on the side and the housing is provided with the rotation groove capable of rotating and locking the protrusions about the axis, the annular member is bayonet-coupled to the housing.

The width of the rotary groove is gradually narrowed as the rotation angle increases, so that the fitting force of the protrusion increases as the rotation angle increases.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

(First Embodiment) FIG. 1 is a schematic view of a sealing device according to the present invention.

In FIG. 1, a sealing device A includes a lip portion 1 made of a rubber-like elastic body that slidably contacts a shaft 10 and seals a fluid to be sealed, and the lip portion 1 is integrally molded to seal the fluid to be sealed and the shaft. The dust seal lip 5 which is provided on the opposite side of the direction and prevents dust and the like from entering, and the lip portion 1 and the dust seal lip 5 are integrally molded, and the housing 11
A second lip portion 6 for sealing the fluid to be sealed between
A plate-shaped metal ring 3 as an annular member that supports these rubber-like elastic members, and a spring 4 that is provided on the outer peripheral side of the lip portion 1 and that adjusts the pressing force between the shaft 10 are provided. are doing.

The lip portion 1 extends from the end portion on the inner diameter side of the metal ring 3 toward the fluid to be sealed in the direction in which the diameter gradually decreases.
It abuts on the outer periphery of the shaft 10 to reliably seal the fluid to be sealed.

Further, the pressing force with the shaft 10 can be adjusted by the spring 4 provided on the outer peripheral side of the lip portion 1.

Like the lip portion 1, the dust seal lip 5 extends from the inner diameter side end portion of the metal ring 3 toward the side opposite to the fluid to be sealed in a direction in which the diameter is gradually reduced, and contacts the outer circumference of the shaft 10. It prevents foreign matter such as dust from entering. If necessary, a plurality of dust seal lips 5 can be provided,
It may be omitted if not particularly required.

Further, the second lip portion 6 extends from the metal ring 3 to the inner peripheral side of the housing 11 and extends toward the fluid to be sealed in the axial direction, and the tip of the second lip portion is inclined in a direction in which the diameter slightly expands. By being molded, the pressing force with the housing 11 is improved, and the fluid to be sealed is reliably sealed. The second lip portion 6 may be configured to be fitted on the inner peripheral side of the housing 11.

FIG. 2 is a plan view of the metal ring 3.

In FIG. 2, the metal ring 3 is provided with a plurality of protrusions 7 (four places in this embodiment) on the outer peripheral side. Of course, it is not necessary to have four places, this sealing device A
Can be held.

Further, the metal ring 3 has a plate shape and can be formed by cutting the metal plate without bending, which leads to cost reduction.

In this embodiment, the metal ring 3 made of metal is used as the annular member, but the present invention is not limited to this, and a resin may be used.

A method of mounting the sealing device A on the housing 11 and the shaft 10 will be described below.

FIG. 3 is a schematic view showing a state in which the sealing device A is mounted on the housing 11, and FIG.
5 is a schematic view showing an end portion of FIG. 5, and FIG. 5 is a perspective view of a main part showing a mounting portion of the sealing device A in the housing 11.

3 to 5, the protrusion 7 is pushed in a direction toward the fluid to be sealed from an insertion groove 8 provided at an end of the housing 11, which is a mounting portion of the sealing device A, and in this embodiment, By being rotated in the direction shown by the arrow in FIG. 4 (clockwise), it is fitted into the rotation groove 9 provided in the direction of the arrow of the insertion groove 8.

The rotation groove 9 is constructed such that the groove width gradually becomes smaller in the direction indicated by the arrow (see FIG. 5), and the projection 7 is fitted therein, and the rotation groove 9 is in the fitted state. When the sealing device A is in use, the sealing device A does not come off.

Further, this rotation direction takes into consideration the usage method of the sealing device A in a state where it is mounted on the housing 11 and the shaft 10. For example, in this embodiment, the shaft 10 is relatively arranged with respect to the housing 11. Since it is used by being rotated in the direction indicated by the arrow (clockwise direction), even if sliding friction occurs, this is the direction in which the fitting of the protrusion 7 becomes strong, and it will never come off. Of course, even if the shaft 10 is used by rotating it in the counterclockwise direction which is the opposite direction to the housing 11, it does not come off, but in this case, the rotation groove 9 of FIG. It can also be provided in the direction opposite to the arrow.

In particular, when the fitting is required to be strong, for example, as shown in FIG. 4, a hole 9a penetrating the rotation groove 9 is formed.
Alternatively, a pin or the like may be driven into the protrusion 7 fitted through the hole 9a to add a structure such as a stopper. Of course, a plurality of the holes 9a can be provided, and the holes 9a and the stoppers are not limited as long as they can be firmly fitted.

In this embodiment, an insertion groove 8 is provided, and the insertion groove 8 can prevent the shaft eccentricity of the sealing device A and facilitate the mounting. Even if the insertion groove 8 is not provided, the metal ring 3 of the sealing device A is abutted against the mounting position, which is the end surface of the housing 11, and the rotary groove 9 is provided as an engaging portion that engages with the protrusion 7 of the metal ring 3. For example, it can be mounted by rotating it around the shaft 10.

Further, after the sealing device A'is mounted as in the conventional case, the mounting position is moved in the axial direction and, for example, falls off,
There is a possibility that it may interfere with other members, but if it is a bayonet connection that locks by such rotation, the sealing device A does not move in the axial direction, and is mounted with a bolt or the like. Compared with the method, the mounting man-hour can be significantly reduced.

On the other hand, the insertion groove 8 is provided so as to correspond to the protrusion 7. In this embodiment, there are four positions on the circumference at equal intervals (90 degree intervals), and the structure can be mounted even if they are displaced by 90 degrees. However, when it is necessary to mount them in a predetermined direction, By changing the width, length, etc. of the protrusion 7 and the insertion groove 8 corresponding thereto, it is possible to mount the protrusion 7 only in a predetermined direction. Further, the same effect can be obtained by shifting the intervals between the plurality of protrusions 7 and the intervals between the plurality of insertion grooves 8 corresponding to the protrusions 7 from each other instead of making them equal.

[0033]

The present invention has the above-described structure and operation. Since the annular member is formed so that the mounting portion with the housing is thin in the axial direction, there is no portion to be fitted on the inner circumference of the housing, which saves the work. Space can be achieved, the volume of the fluid to be sealed can be secured, and the weight can be reduced. Further, the bayonet connection facilitates mounting, reduces man-hours, and reduces cost.

By forming the width of the rotary groove gradually narrow as the rotation angle increases, the fitting force of the protrusion increases as the rotation angle increases, and the protrusion can be securely fixed without providing a stopper or the like.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a metal ring applied to a sealing device according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a state in which the sealing device according to the embodiment of the present invention is mounted on the housing.

FIG. 4 is a schematic view of a main part showing a sealing device mounting portion of a housing applied to the present invention.

FIG. 5 is a perspective view of an essential part showing a sealing device mounting portion of a housing applied to the present invention.

FIG. 6 is a schematic cross-sectional view showing a conventional sealing device.

[Explanation of symbols]

 A, A'Sealing device 1,101 Lip part 3,103 Metal ring (annular member) 4,104 Spring 5,105 Dust seal lip 6 Second lip part 7 Protrusion 8 Insertion groove 9 Rotation groove 9a Hole 10,110 Shaft 11, 111 Housing 102 Fitting part

Claims (2)

[Claims] 1. A sealing device comprising: a lip portion that is in sliding contact with a shaft; and an annular member that is mounted on a housing that supports the lip portion and that can move relative to the shaft. Is thin in the axial direction, a plurality of protrusions are provided on the outer peripheral side in the radial direction, and the housing is provided with a rotation groove capable of rotating and locking the protrusions about an axis. 2. The sealing device according to claim 1, wherein the rotation groove is formed so that the width of the rotation groove is gradually narrowed as the rotation angle increases.