JP2001336641A - Sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure designed for enhanced abrasion resistance. SOLUTION: The sealing structure is composed of a shaft 10, a housing 20 furnished with a shaft hole to admit insertion of the shaft 10, and a seal ring 30 for sealing a ring-shaped gap formed between them, wherein a communication groove 12 for generating communication of the sealing fluid side O with the non-fluid side A is provided at the side wall surface 11a of a ring-shaped groove 11 provided in the shaft 10, i.e., that surface of the seal ring 30 which is sealed by the first seal face 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for sealing an annular gap between two members provided rotatably relative to each other with a seal ring.

[0002]

2. Description of the Related Art Conventionally, this kind of sealing structure is, for example,
It is used for hydraulic devices such as automatic transmissions of automobiles.

[0003] A conventional sealing structure will be described below with reference to FIG. Here, FIG. 8 is a schematic sectional view of a sealing structure according to the related art.

As shown in the drawing, this type of sealing structure generally includes a shaft 100, a housing 200 provided with a shaft hole into which the shaft 100 is inserted, and a seal for sealing an annular gap therebetween. And a ring 300.

The shaft 100 and the housing 200 are provided so as to be relatively rotatable relative to each other. The shaft 100 has an annular groove 101 formed therein, and a seal ring 300 is mounted in the annular groove 101. You.

The seal ring 300 is formed of a resin material, and has a first seal surface 301 for sealing the side wall surface 101a of the annular groove 101 provided on the shaft 100;
A second sealing surface 302 for sealing the inner peripheral surface 201 of the shaft hole provided in the housing 200.

Then, from the sealed fluid side O to the non-sealed fluid side A
When pressure is applied in the direction of arrow P in the drawing, the seal ring 300 is pressed against the non-sealed fluid side A, so that the first seal surface 301 presses the side wall surface 101a of the annular groove 101, and The two sealing surfaces 302 press the inner peripheral surface 201 of a shaft hole provided in the housing 200 facing the annular groove 101, and seal at each position.

In this manner, leakage of the sealed fluid to the non-sealed fluid side A has been prevented.

Here, the sealed fluid is, for example, a lubricating oil, and particularly refers to an ATF when used for a transmission of an automobile.

[0010]

However, in the case of the above-described prior art, the following problems have occurred.

In the above-described conventional sealing structure, it is difficult to form a lubricating film between the first sealing surface 301 of the seal ring 300 and the side wall surface 101a of the annular groove 101. Due to the relative rotation, wear occurs on the first seal surface 301 and the side wall surface 101a.

Further, when foreign matter present in the lubricating oil is caught between them or when abrasion dust accumulates, the wear is further promoted.

In particular, when the shaft 100 is made of a soft material such as an aluminum alloy, the wear becomes severe, and abnormal wear may occur.

SUMMARY OF THE INVENTION 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 structure having improved wear resistance.

[0015]

In order to achieve the above object, according to the present invention, a seal ring is mounted in an annular groove provided in one of two members provided rotatably relative to each other. The seal ring seals the annular gap between the two members by sealing the side wall surface of the annular groove and the surface of the other member, respectively, in the sealing structure. A communication groove is provided on the side wall surface of the groove to communicate the sealed fluid side and the non-sealed fluid side.

Accordingly, since the sealing fluid leaks due to the communication groove provided on the side wall surface of the annular groove, a film of the sealing fluid is formed between the seal ring and the side wall surface of the annular groove. Even if foreign matter enters between the seal ring and the side wall surface of the annular groove, the foreign matter is discharged by the communication groove.

[0017]

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 materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

A sealing structure according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic perspective view of a shaft according to an embodiment of the present invention, and shows a perspective view of a part of a broken part passing through the shaft center. FIG. 2 is a schematic plan view in a state where the shaft and the seal ring according to the embodiment of the present invention are mounted, and a part of the plan view is schematically illustrated. FIG. 3 is a schematic cross-sectional view of the sealing structure according to the embodiment of the present invention.

As shown in FIG. 3, the sealing structure according to the present embodiment generally includes a shaft 10, a housing 20 having a shaft hole into which the shaft 10 is inserted, and an annular gap therebetween. And a seal ring 30 for sealing.

The shaft 10 as one of the two members and the housing 20 as the other member are provided so as to be rotatable relative to each other, and the shaft 10 has an annular groove 11 formed therein. The seal ring 30 is mounted in the annular groove 11.

The seal ring 30 seals the first seal surface 31 for sealing the side wall surface 11 a of the annular groove 11 provided on the shaft 10 and the inner peripheral surface 21 of the shaft hole provided on the housing 20. And a second sealing surface 32.

Then, from the sealed fluid side O to the non-sealed fluid side A
When pressure is applied in the direction of arrow P in FIG. 3, the seal ring 30 is pressed against the non-sealed fluid side A, so that the first seal surface 31 presses the side wall surface 11a of the annular groove 11, and The second sealing surface 32 presses a portion facing the annular groove 11 on the inner peripheral surface 21 of the shaft hole provided in the housing 20 to seal at each position.

As described above, the non-sealed fluid side A of the sealed fluid
To prevent leakage to

As a material for forming the seal ring 30, a resin composition comprising a heat-resistant resin and a filler can be used.

Examples of the heat-resistant resin include aromatic polyether ketone resins such as polycyano aryl ether resin (PEN) and polyether ether ketone (PEEK) resin, aromatic thermoplastic polyimide resin, polyamide 4 Examples of such resins include -6 type resins, polyphenylene sulfide type resins, and polytetrafluoroethylene type resins, which are excellent in heat resistance, flame resistance and chemical resistance and have excellent mechanical properties.

The filler is incorporated for the purpose of improving the mechanical strength of the material, improving the abrasion resistance, imparting low friction characteristics, and the like, and is not particularly limited.

Further, the sealed fluid in the present embodiment is:
This means a fluid having lubricity, and in the following description, lubricating oil will be described as an example.

In the sealing structure according to the present embodiment, the sealing fluid side O is provided on the side wall surface 11a of the annular groove 11 of the shaft 10, that is, the surface sealed by the first sealing surface 31 of the seal ring 30. A communication groove 12 for communicating with the non-sealed fluid side A is provided.

By providing the communication groove 12 in this manner, since the lubricating oil leaks as shown by the arrow Q in FIGS. 2 and 3, the first seal surface 31 and the side wall surface 11a of the annular groove 11 of the shaft 10 Between them, an oil film is formed, the lubrication state is improved, and the abrasion resistance is improved.

Further, when foreign matter or abrasion powder (contamination) is mixed in the lubricating oil, the foreign matter or the like enters between the first seal surface 31 and the side wall surface 11a of the annular groove 11 of the shaft 10. Even in such a case, these foreign substances and the like are easily discharged to the non-sealed fluid side A by the communication groove 12, so that it is possible to reduce the promotion of abrasion caused by the foreign substances and the like as in the related art, and to reduce the wear resistance. improves.

The shape and dimensions of the communication groove 12 are not particularly limited. However, in order to maintain the sealing performance, the leakage amount (leakage amount) of the lubricating oil from the communication groove 12 is reduced to some extent. Needless to say, it must be suppressed.

Therefore, in consideration of both the sealing performance and the abrasion resistance, the width and depth of the groove are adjusted so that the oil film is sufficiently formed while suppressing the leak amount, and according to the allowable leak amount of the equipment. It is desired to set For example, the groove width of the communication groove 12 is 0.05 to 0.35 mm, preferably 0.1 to 0.1 mm.
2 mm is suitable, and the groove depth is 0.05 to 0.35 m
m, preferably 0.1 to 0.2 mm, and the number thereof is not particularly limited, but is preferably 1 to 4.

Here, other examples of the configuration of the communication groove will be described with reference to FIGS.

In the illustrated examples shown in FIGS. 1 to 3, the case where the communication groove 12 is formed so as to extend perpendicularly to the axis is shown. However, like the communication groove 13 shown in FIG. You may make it incline with respect to a heart.

Further, in the illustrated examples shown in FIGS. 1 to 3, the case where the communication groove 12 is formed to have a constant depth is shown. However, as shown in FIG. Alternatively, the depth of the annular groove 11 may be changed between the groove bottom and the surface side.

Further, like the communication groove 15 shown in FIG.
If the boundary between the side surface of the communication groove 15 and the side wall surface 11a of the annular groove 11 is edge-shaped, the sealing ring may bite, which may promote wear. Therefore, it is better to perform C or R chamfering.

Also, the cross-sectional shape of the communication groove is not limited to a rectangle as shown in FIGS. 1 to 3 described above, but may be a trapezoid shown in FIG. 7A, a hexagon shown in FIG. A triangular shape shown in c) or a semicircle shown in FIG.

[0039]

As described above, according to the present invention, the communication groove is provided on the side wall surface of the annular groove sealed by the seal ring, so that a film is formed between the seal ring and the side wall surface of the annular groove. In addition, since foreign matter that has entered between the seal ring and the side wall surface of the annular groove can be discharged, wear resistance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a shaft according to an embodiment of the present invention.

FIG. 2 is a schematic plan view in a state where a shaft and a seal ring according to the embodiment of the present invention are mounted.

FIG. 3 is a schematic sectional view of a sealing structure according to the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration modification of a communication groove.

FIG. 5 is a schematic diagram illustrating a configuration modification of a communication groove.

FIG. 6 is a schematic diagram illustrating a configuration modification of a communication groove.

FIG. 7 is a schematic sectional view showing an example of a sectional shape of a communication groove.

FIG. 8 is a schematic sectional view of a sealing structure according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shaft 11 Annular groove 11a Side wall surface 12 Communication groove 20 Housing 21 Inner peripheral surface 30 Seal ring 31 First seal surface 32 Second seal surface

Claims (1)

[Claims] 1. A seal ring is mounted on an annular groove provided on one of two members provided rotatably relative to each other, and the side wall surface of the annular groove and the other member are provided by the seal ring. In the sealing structure for sealing the annular gap between the two members by respectively sealing the surfaces of the annular member, the sealed fluid side and the non-sealed fluid side communicate with the side wall surface of the annular groove sealed by the seal ring. A sealing structure characterized by providing a communication groove.