WO2014041832A1

WO2014041832A1 - Seal ring

Info

Publication number: WO2014041832A1
Application number: PCT/JP2013/058307
Authority: WO
Inventors: 徳永渉
Original assignee: Nok株式会社
Priority date: 2012-09-13
Filing date: 2013-03-22
Publication date: 2014-03-20
Also published as: CN104620028B; JP2014055645A; CN104620028A; DE112013004454T5

Abstract

Provided is a seal ring which can reduce the amount of leakage of fluid to be sealed, the leakage flowing from a high-pressure region to a low-pressure region. A seal ring (100) is mounted in an annular groove (210) provided in the outer periphery of a shaft (200). The seal ring (100) seals the annular gap between the shaft (200) and a housing (300), the shaft (200) and the housing (300) rotating relative to each other, and separates a low-pressure region (L) and a high-pressure region (H) in which fluid to be sealed is present. When the shaft (200) and the housing (300) rotate relative to each other, a side surface of the seal ring (100), the side surface facing the low-pressure region, and a side surface of the annular groove slide on each other. The seal ring (100) is provided with a side surface groove (110) which is provided in a side surface of the seal ring (100), the side surface facing the low-pressure region (L), and which extends from the position at which the side surface groove (110) is exposed to the low-pressure region (L), toward the inner peripheral surface side of the seal ring (100) to a position not reaching the inner peripheral surface.

Description

Seal ring

The present invention relates to a seal ring that seals an annular gap between a relatively rotating shaft and a housing.

Conventionally, a seal ring that seals an annular gap between a relatively rotating shaft and a housing is known. A seal ring according to a conventional example will be described with reference to FIG. FIG. 25 is a schematic cross-sectional view showing a use state of a seal ring according to a conventional example.

The seal ring 500 is attached to an annular groove 210 provided on the outer periphery of the shaft 200, and seals an annular gap between the relatively rotating shaft 200 and the housing 300 to thereby provide a high pressure region (H) and a low pressure region ( L) Demonstrates the function of separating. Here, the seal ring 500 is brought into close contact with the side surface on the low pressure region (L) side of the annular groove 210 and the inner peripheral surface 310 of the shaft hole in the housing 300 by the fluid pressure of the fluid to be sealed in the high pressure region (H). By maintaining this state, sealing performance is exhibited.

Further, the seal ring 500 slides with respect to the side surface on the low pressure region (L) side of the annular groove 210 and the inner peripheral surface 310 of the shaft hole in the housing 300 when the shaft 200 and the housing 300 are relatively rotated. Whether or not a lubricating film (film made of a fluid to be sealed such as an oil film) is stably formed greatly affects durability. This is because not only the sliding resistance is increased when the lubricating film is not formed, but also the sliding wear is further promoted when the wear powder generated by the sliding wear or the foreign matter intervenes in the sliding portion. As a result, the service life is significantly reduced. In particular, when the shaft 200 is a soft material such as an aluminum alloy, the above-described problem becomes even more remarkable.

On the other hand, when the leakage amount of the fluid to be sealed to the low pressure region (L) is increased in order to improve the lubricity between the shaft 200 and the housing 300 and the seal ring 500, the pressure in the high pressure region (H) is set to a desired value. In order to maintain the pressure, it is necessary to increase the amount of fluid to be sealed supplied to the high pressure region (H). Moreover, there is a possibility that the responsiveness may be lowered when the pressure in the high pressure region (H) is increased.

JP 2006-9897 A Japanese Utility Model Publication No. 4-84864

An object of the present invention is to provide a seal ring capable of suppressing sliding wear while suppressing a leakage amount of a fluid to be sealed from a high pressure region to a low pressure region.

The seal ring according to the present invention is
A seal ring that is mounted in an annular groove provided on the outer periphery of the shaft and seals an annular gap between the relatively rotating shaft and the housing and separates the high-pressure region and the low-pressure region where the fluid to be sealed exists. Because
The position exposed to the low pressure region on the side surface on the low pressure region side for use in applications where the side surface on the low pressure region side and the side surface of the annular groove slide relative to each other when the shaft and the housing rotate relatively Side groove, which is a groove extending from the inner peripheral surface side to the position not reaching the inner peripheral surface,
Or
When the shaft and the housing are rotated relatively, the outer peripheral surface and the inner peripheral surface of the shaft hole in the housing are slid relative to each other. Any one of the outer peripheral surface grooves which are grooves extending to a position not reaching the side surface on the high pressure region side toward the side is provided.

In the present invention, the seal ring exhibits a sealing property by maintaining a state in close contact with the side surface on the low pressure region side of the annular groove provided in the shaft and the inner peripheral surface of the shaft hole in the housing. At this time, when the shaft and the housing rotate relatively, the side surface on the low pressure region side of the seal ring and the side surface of the annular groove (side surface on the low pressure region side) slide with each other, or the outer peripheral surface of the seal ring The inner peripheral surface of the shaft hole in the housing slides on each other.

When the side surface on the low pressure region side and the side surface of the annular groove (side surface on the low pressure region side) slide relative to each other when the shaft and the housing rotate relatively, on the side surface on the low pressure region side of the seal ring, A side surface groove is formed that extends from a position exposed in the low pressure region to a position not reaching the inner peripheral surface toward the inner peripheral surface. In this case, when the side surface of the annular groove slides with respect to the seal ring, the fluid to be sealed that has leaked into the low pressure region is taken into the side surface groove. The fluid to be sealed taken into the side groove enters the sliding portion between the side surface of the annular groove and the seal ring, and returns to the high pressure region through the sliding portion.

Further, when the outer peripheral surface and the inner peripheral surface of the shaft hole in the housing slide relative to each other when the shaft and the housing rotate relatively, the outer peripheral surface is directed from the side surface on the low pressure region side toward the high pressure region side. An outer peripheral surface groove that is a groove extending to a position not reaching the side surface on the high pressure region side is formed. In this case, when the inner peripheral surface of the shaft hole in the housing slides with respect to the seal ring, the fluid to be sealed leaked into the low pressure region is taken into the outer peripheral surface groove. Then, the fluid to be sealed taken into the outer peripheral surface groove enters the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing, and returns to the high pressure region through the sliding portion. Therefore, according to the present invention, the leakage amount of the fluid to be sealed from the high pressure region to the low pressure region can be suppressed.

Further, according to the present invention, the fluid to be sealed that has leaked into the low pressure region is also returned to the sliding portion between the side surface of the annular groove or the inner peripheral surface of the shaft hole in the housing and the seal ring. Therefore, it is possible to stably form a lubricating film of a fluid to be sealed having a sufficient thickness at the sliding portion. Therefore, sliding wear can also be suppressed.

When the seal ring according to the present invention includes the side groove, the wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring in the side groove is sealed from the outer peripheral surface side toward the inner peripheral surface side. You may incline in the sliding direction of the side surface of the annular groove with respect to a ring.

According to this, the fluid to be sealed taken into the side groove from the low pressure region enters the sliding portion between the side surface of the annular groove and the seal ring due to the wedge effect generated by the inclination of the wall surface of the side groove. It becomes easy. Therefore, the fluid to be sealed that has leaked into the low pressure region is easily returned by the high pressure region, and a lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the side surface of the annular groove and the seal ring.

Further, when the shaft and the housing rotate relatively not only in the normal direction but also in the reverse direction, a plurality of the side grooves may be provided on the side surface on the low pressure region side of the seal ring. Then, in some of the side grooves, the wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring at the time of forward rotation is positive from the outer peripheral surface side toward the inner peripheral surface side. The wall surface on the sliding direction side in the reverse rotation of the side surface of the annular groove with respect to the seal ring from the outer peripheral surface side to the inner peripheral surface side is inclined in the sliding direction during rotation. Alternatively, the side surface of the annular groove with respect to the seal ring may be inclined in the sliding direction during reverse rotation.

According to this, even when the shaft and the housing rotate relatively in either the forward direction or the reverse direction, it becomes possible to obtain a wedge effect that occurs due to the inclination of the wall surface of the side groove. . Therefore, the fluid to be sealed that has leaked into the low pressure region is easily returned by the high pressure region regardless of the rotation direction, and a lubricating film of the fluid to be sealed is further formed on the sliding portion between the side surface of the annular groove and the seal ring. It becomes easy.

Further, when the seal ring according to the present invention includes the side groove, and the side groove is the first side groove, the seal ring is arranged on the side surface on the low pressure region side from the inner peripheral surface to the outer peripheral surface side. A second side groove that extends to a position that does not reach the position exposed to the low pressure region toward the bottom may be further provided.

According to this, when the side surface of the annular groove (the side surface on the low pressure region side) slides with respect to the seal ring, the fluid to be sealed in the high pressure region is taken into the second side surface groove. Since the fluid to be sealed taken into the second side groove enters the sliding portion between the side surface of the annular groove and the seal ring, a lubricating film of the fluid to be sealed is more easily formed on the sliding portion.

Further, when the second side groove is provided in the seal ring, the fluid to be sealed in the high pressure region is easily sent to the low pressure region side, but the fluid to be sealed sent to the low pressure region side is taken into the first side groove. be able to. Therefore, even when the second side surface groove is provided, the leakage amount of the fluid to be sealed from the high pressure region to the low pressure region can be suppressed.

The wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring in the second side surface groove is inclined in the sliding direction of the side surface of the annular groove with respect to the seal ring from the inner peripheral surface side toward the outer peripheral surface side. It may be.

According to this, the fluid to be sealed taken into the second side groove from the high-pressure region causes the side surface of the annular groove and the seal ring due to the wedge effect generated when the wall surface of the second side groove is inclined. It becomes easy to enter the sliding part. Therefore, a lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the side surface of the annular groove on the low pressure region side and the seal ring.

In the seal ring according to the present invention, when the shaft and the housing relatively rotate not only in the forward direction but also in the reverse direction, a plurality of the second side grooves are provided on the side surface on the low pressure region side of the seal ring. It may be. Then, the wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring in the part of the second side surface groove at the time of positive rotation is from the inner peripheral surface side toward the outer peripheral surface side. The wall surface on the sliding direction side during reverse rotation of the side surface of the annular groove with respect to the seal ring is inclined in the sliding direction at the time of forward rotation of the side surface. You may incline in the sliding direction at the time of reverse rotation of the side surface of the annular groove with respect to a seal ring toward the outer peripheral surface side from the side.

According to this, even if the shaft and the housing rotate relatively in either the forward direction or the reverse direction, it is possible to obtain a wedge effect caused by the inclination of the wall surface of the second side surface groove. It becomes possible. Therefore, the fluid to be sealed taken into the second side groove from the high pressure region easily enters the sliding portion between the side surface of the annular groove and the seal ring regardless of the rotation direction.

Further, when the seal ring according to the present invention includes the outer peripheral surface groove, the wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the outer peripheral surface groove is high pressure from the low pressure region side. You may incline in the sliding direction of the internal peripheral surface of the axial hole in the housing with respect to a seal ring toward the area | region side.

According to this, the fluid to be sealed taken into the outer peripheral surface groove from the low-pressure region causes the inner peripheral surface of the shaft hole in the housing and the seal ring due to the wedge effect generated by the inclination of the wall surface of the outer peripheral surface groove. It becomes easy to enter the sliding part. Therefore, the fluid to be sealed leaked to the low pressure region is easily returned by the high pressure region, and a lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing. .

Further, when the shaft and the housing rotate relatively not only in the normal direction but also in the reverse direction, a plurality of the outer peripheral surface grooves may be provided on the outer peripheral surface of the seal ring. And the wall surface of the sliding direction side at the time of forward rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in a part of the outer peripheral surface groove is in the housing with respect to the seal ring from the low pressure region side to the high pressure region side. Sliding in the sliding direction at the time of forward rotation of the inner peripheral surface of the shaft hole, and the sliding direction side at the time of reverse rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in some other outer peripheral surface grooves The wall surface may be inclined in the sliding direction at the time of reverse rotation of the inner peripheral surface of the shaft hole in the housing relative to the seal ring from the low pressure region side toward the high pressure region side.

According to this, even when the shaft and the housing rotate relatively in either the forward direction or the reverse direction, it is possible to obtain a wedge effect caused by the inclination of the wall surface of the outer peripheral surface groove. Become. Therefore, the fluid to be sealed leaked to the low pressure region is easily returned by the high pressure region regardless of the rotation direction, and the lubricating film of the fluid to be sealed is formed on the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing. Is more easily formed.

Further, when the seal ring according to the present invention includes the outer peripheral surface groove and the outer peripheral surface groove is the first outer peripheral surface groove, the seal ring has a low pressure from the side surface on the high pressure region side on the outer peripheral surface. You may further provide the 2nd outer peripheral surface groove | channel extended to the position which does not reach the side surface of the low voltage | pressure area | region side toward the area | region side.

According to this, when the inner peripheral surface of the shaft hole in the housing slides with respect to the seal ring, the fluid to be sealed in the high pressure region is taken into the second outer peripheral surface groove. And since the fluid to be sealed taken into the second outer peripheral surface groove enters the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing, a lubricating film of the fluid to be sealed is further formed on the sliding portion. It becomes easy to be done.

Further, when the second outer peripheral surface groove is provided in the seal ring, the fluid to be sealed in the high pressure region is easily sent to the low pressure region side, but the fluid to be sealed sent to the low pressure region side is the first outer surface groove. Can be imported. Therefore, even when the second outer peripheral groove is provided, the leakage amount of the fluid to be sealed from the high pressure region to the low pressure region can be suppressed.

The inner peripheral surface of the shaft hole in the housing with respect to the seal ring has a wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the second outer peripheral surface groove from the high pressure region side to the low pressure region side. You may incline in the sliding direction of a surface.

According to this, the fluid to be sealed taken into the second outer peripheral surface groove from the high pressure region causes the inner wall of the shaft hole in the housing to have a wedge effect caused by the inclination of the wall surface of the second outer peripheral surface groove. It becomes easy to enter the sliding portion between the peripheral surface and the seal ring. Therefore, a lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing.

In the seal ring according to the present invention, when the shaft and the housing relatively rotate not only in the forward direction but also in the reverse direction, a plurality of the second outer peripheral surface grooves are provided on the outer peripheral surface of the seal ring. Also good. The wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in a part of the second outer peripheral surface groove is the seal ring from the high pressure region side toward the low pressure region side. The inner peripheral surface of the shaft hole in the housing is inclined in the sliding direction at the time of forward rotation of the inner peripheral surface of the shaft hole in the housing, and the reverse rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring The wall surface on the sliding direction side at this time may be inclined from the high pressure region side toward the low pressure region side in the sliding direction at the time of reverse rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring.

According to this, even if the shaft and the housing rotate relatively in either the forward direction or the reverse direction, the wedge effect that is generated by the inclination of the wall surface of the second outer peripheral groove is obtained. Is possible. Therefore, regardless of the rotation direction, the fluid to be sealed taken into the second outer peripheral surface groove from the high pressure region easily enters the sliding portion between the inner peripheral surface of the shaft hole and the seal ring in the housing.

According to the present invention, sliding wear can be suppressed while suppressing the leakage amount of the fluid to be sealed from the high pressure region to the low pressure region.

FIG. 1 is a side view of a seal ring according to the first embodiment. FIG. 2 is a view of the seal ring according to the first embodiment when viewed from the outer peripheral surface side. FIG. 3 is a side view of the seal ring according to the first embodiment. FIG. 4 is a schematic cross-sectional view of the seal ring according to the first embodiment. FIG. 5 is a partially broken perspective view showing a use state of the seal ring according to the first embodiment. FIG. 6 is a schematic cross-sectional view illustrating a usage state of the seal ring according to the first embodiment. FIG. 7 is a part of a side view of the seal ring according to the second embodiment. FIG. 8 is a partially broken perspective view showing a usage state of the seal ring according to the second embodiment. FIG. 9 is a part of a side view of the seal ring according to the third embodiment. FIG. 10 is a part of a side view of the seal ring according to the fourth embodiment. FIG. 11 is a part of a side view of the seal ring according to the fourth embodiment. FIG. 12 is a partial view of the seal ring according to the fifth embodiment as viewed from the outer peripheral surface side. FIG. 13 is a side view of the seal ring according to the sixth embodiment. FIG. 14 is a view of the seal ring according to the sixth embodiment as viewed from the outer peripheral surface side. FIG. 15 is a side view of the seal ring according to the sixth embodiment. FIG. 16 is a schematic cross-sectional view of a seal ring according to the sixth embodiment. FIG. 17 is a partially broken perspective view showing a use state of the seal ring according to the sixth embodiment. FIG. 18 is a schematic cross-sectional view illustrating a usage state of the seal ring according to the sixth embodiment. FIG. 19 is a partial view of the seal ring according to the seventh embodiment as viewed from the outer peripheral surface side. FIG. 20 is a partially broken perspective view showing a use state of the seal ring according to the seventh embodiment. FIG. 21 is a partial view of the seal ring according to the eighth embodiment when viewed from the outer peripheral surface side. FIG. 22 is a part of a view of the seal ring according to the ninth embodiment as viewed from the outer peripheral surface side. FIG. 23 is a partial view of the seal ring according to the ninth embodiment as viewed from the outer peripheral surface side. FIG. 24 is a part of a side view of the seal ring according to the tenth embodiment. FIG. 25 is a schematic cross-sectional view showing a use state of a seal ring according to a conventional example.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the present embodiment are not intended to limit the technical scope of the invention to those unless otherwise specified.

<Example 1>
A seal ring according to Embodiment 1 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is mounted in an annular groove provided on the outer periphery of the shaft, seals the annular gap between the shaft and the housing, and provides a high pressure region and a low pressure region where the fluid to be sealed exists. It is separated. In this embodiment, the shaft rotates relative to the housing. However, the seal ring according to the present invention can also be applied to a configuration in which the housing rotates with respect to the shaft and a configuration in which both the shaft and the housing rotate relatively.

[Configuration of seal ring]
1 to 4 are diagrams showing a configuration of a seal ring 100 according to the present embodiment. 1 and 3 are side views of the seal ring 100. FIG. FIG. 1 shows a side surface facing the low pressure region when the seal ring 100 is installed in the annular groove of the shaft, and FIG. 3 shows a high pressure region when the seal ring 100 is installed in the annular groove of the shaft. The side facing the side is shown. FIG. 2 shows the seal ring 100 as viewed from the outer peripheral surface side. 4 is a cross-sectional view taken along the line AA in FIG.

The seal ring 100 according to the present embodiment is a resin-made annular member such as PTFE, and a cut portion (joint) C is provided at one place in the circumferential direction. In the present embodiment, the case of the special step cut in which both the side surface side and the outer peripheral surface side are cut in a step shape is shown, but various known techniques can be adopted for the cut portion C.

Further, in the seal ring 100 according to the present embodiment, a plurality of grooves 110 are provided on a side surface (side surface on the low pressure region side) facing the low pressure region side when the seal ring 100 is attached to the annular groove of the shaft. These grooves 110 are configured to extend from the outer peripheral surface toward the inner peripheral surface to a position that does not reach the inner peripheral surface. Hereinafter, the groove provided on the side surface of the seal ring on the low pressure region side is referred to as a side surface groove.

[Operation of seal ring]
Next, the operation of the seal ring 100 according to the present embodiment will be described with reference to FIGS. 5 and 6 are partially broken perspective views showing the use state of the seal ring according to the present embodiment. FIG. 5 is a perspective view for easy understanding of the mechanism.

The seal ring 100 according to the present embodiment is mounted in an annular groove 210 provided on the outer periphery of the shaft 200, and seals the annular gap between the shaft 200 and the housing 300. As a result, the high pressure region (H) where the fluid to be sealed such as oil is present is separated from the low pressure region (L). Here, the seal ring 100 is fixed to the side surface on the low pressure region (L) side of the annular groove 210 and the inner peripheral surface 310 of the shaft hole in the housing 300 by the fluid pressure of the fluid to be sealed in the high pressure region (H). By maintaining a close state, it exhibits sealing properties. In the case of the present embodiment, when the shaft 200 rotates with respect to the housing 300, the side surface on the low pressure region (L) side of the annular groove 210 slides with respect to the seal ring 100.

The side groove 110 provided on the side surface on the low pressure region (L) side of the seal ring 100 extends from the outer peripheral surface of the seal ring 100 toward the inner peripheral surface to a position that does not reach the inner peripheral surface. That is, the side groove 110 is configured to extend from the position exposed to the low pressure region toward the inner peripheral surface on the side surface on the low pressure region (L) side of the seal ring 100 and not reach the high pressure region. .

In the seal ring 100 configured as described above, the shaft 200 rotates and the side surface (the side surface on the low pressure region (L) side) of the annular groove 210 slides relative to the seal ring 100, so that the high pressure region ( The fluid to be sealed that has leaked from H) to the low pressure region (L) is taken into the side groove 110 (note that in FIGS. 5 and 6, the white arrow indicates the rotation direction of the shaft 200).

The fluid to be sealed taken into the side groove 110 has an inner circumference along the side surface on the rotational direction side of the shaft 200 in the side groove 110 (that is, the side surface on the sliding direction side of the side surface of the annular groove 210 with respect to the seal ring 100). Move toward the surface. The fluid to be sealed enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100 due to the pressure generated as the fluid to be sealed moves in the side surface groove 110. The fluid to be sealed that has entered the sliding portion returns to the high pressure region (H) through the sliding portion (note that in FIG. 5, the arrow indicates the movement of the fluid to be sealed).

[Excellent points of the seal ring according to this embodiment]
As described above, according to the seal ring 100 according to the present embodiment, by providing the side groove 110, the fluid to be sealed leaked into the low pressure region (L) is taken into the side groove 110, and the side groove The fluid to be sealed taken in 110 is returned to the high pressure region (H). Therefore, the leakage amount of the fluid to be sealed from the high pressure region (H) to the low pressure region (L) can be suppressed.

Thereby, in order to maintain the pressure in the high pressure region (H) at a desired pressure, it is possible to suppress the amount of the fluid to be sealed supplied to the high pressure region (H), and in the high pressure region (H) Responsiveness when the pressure is increased can be improved.

Further, according to the seal ring 100 according to the present embodiment, the fluid to be sealed that has leaked into the low pressure region (L) is also returned to the sliding portion between the side surface of the annular groove 210 and the seal ring 100. It is possible to stably form a lubricating film of a fluid to be sealed having a sufficient thickness at the sliding portion.

This can suppress an increase in sliding resistance. In addition, an increase in sliding friction due to the presence of wear powder or foreign matter in the sliding portion can be suppressed. Therefore, sliding wear can also be suppressed.

[Others]
In the present embodiment, side grooves 110 may be provided on both side surfaces of the seal ring 100. According to this, since it is not necessary to consider directionality when the seal ring 100 is mounted on the shaft 200, the mounting operation is facilitated. Further, when used in an apparatus in which the high-pressure side and the low-pressure side are alternately switched, the side grooves 110 are provided on both side surfaces of the seal ring 100, so that the above-described even when the high-pressure side and the low-pressure side are switched. Such effects can be obtained.

Further, the side groove 110 provided on the side surface of the seal ring 100 does not necessarily extend from the outer peripheral surface, and may extend from the position exposed in the low pressure region toward the inner peripheral surface. As long as the side groove 110 is exposed in the low pressure region, the fluid to be sealed leaked into the low pressure region is taken into the side groove 110 when the side surface of the annular groove 210 slides with respect to the seal ring 100. Therefore, the fluid to be sealed that has leaked into the low pressure region can be returned to the high pressure region.

<Example 2>
A seal ring according to Embodiment 2 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is different from the seal ring according to the first embodiment in the configuration of the groove. Note that the description of the same configuration and operation as in the first embodiment will be omitted.

[Configuration of seal ring]
FIG. 7 is a part of a side view of the seal ring 100a according to the present embodiment. FIG. 7 shows a side surface of the seal ring 100a on the low pressure region (L) side.

A plurality of side grooves 110a are provided on the side surface of the seal ring 100a according to the present embodiment on the low pressure region (L) side. Similar to the first embodiment, these side surface grooves 110a are configured to extend from the outer peripheral surface toward the inner peripheral surface side to a position that does not reach the inner peripheral surface. However, in Example 1, the side surface groove 110 provided on the side surface of the seal ring 100 extends in the radial direction of the seal ring 100. However, in this example, the side surface groove 110a extends from the outer peripheral surface side to the inner peripheral surface. The shaft 200 is inclined in the direction of rotation of the shaft 200 toward the side (that is, the sliding direction of the side surface of the annular groove 210 with respect to the seal ring 100a). Indicates the direction of rotation).

[Operation of seal ring and superior points of seal ring according to this embodiment]
Next, the operation of the seal ring 100a according to the present embodiment will be described with reference to FIG. FIG. 8 is a partially broken perspective view showing a use state of the seal ring according to the present embodiment. FIG. 8 is a perspective view for easy understanding of the mechanism.

In the seal ring 100a according to the present embodiment, the side surface groove 110a is configured to incline in the rotational direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side. Thereby, the side surface of the side surface groove 110a on the rotational direction side of the shaft 200 is inclined in the rotational direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side.

Also in the seal ring 100a according to the present embodiment, similarly to the first embodiment, the side surface (the side surface on the low pressure region (L) side) of the annular groove 210 slides with respect to the seal ring 100a so that the seal ring 100a can move from the low pressure region (L). The fluid to be sealed taken into the side groove 110a moves toward the inner peripheral surface along the side surface of the side groove 110a on the rotational direction side of the shaft 200, and the side surface on the low pressure region (L) side of the annular groove 210. And the seal ring 100a (in FIG. 8, the arrows indicate the movement of the fluid to be sealed).

At this time, if the side surface of the side surface groove 110a on the rotational direction side of the shaft 200 is inclined as described above, the fluid to be sealed is fed into the side surface groove 110a toward a narrower portion in the wedge-shaped space. As a result, a wedge effect occurs. Therefore, the fluid to be sealed easily enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100a. Therefore, the fluid to be sealed that has leaked into the low pressure region (L) is easily returned by the high pressure region (H), and a lubricating film of the fluid to be sealed is more formed on the sliding portion between the side surface of the annular groove 210 and the seal ring 100a. It becomes easy to form.

<Example 3>
With reference to FIG. 9, the seal ring which concerns on Example 3 of this invention is demonstrated. The seal ring according to the present embodiment is different from the seal ring according to the first embodiment in the configuration of the groove. Note that the description of the same configuration and operation as in the first embodiment will be omitted.

[Configuration of seal ring]
FIG. 9 is a part of a side view of the seal ring 100b according to the present embodiment. FIG. 9 shows a side surface of the seal ring 100b on the low pressure region (L) side.

In this embodiment, the shaft 200 rotates with respect to the housing 300 not only in the forward direction but also in the reverse direction. A plurality of

side grooves

110a and 110b are provided on the side surface on the low pressure region (L) side of the seal ring 100b according to the present embodiment. As in the first embodiment, these

side surface grooves

110a and 110b are configured to extend from the outer peripheral surface toward the inner peripheral surface to a position that does not reach the inner peripheral surface.

The side groove 110a is configured to incline in the normal rotation direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side. On the other hand, the side surface groove 110b is configured to incline in the reverse rotation direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side (in FIG. 9, the solid white arrow indicates the normal direction of the shaft 200). The rotation direction is shown, and the broken white arrow indicates the reverse rotation direction of the shaft 200). The side grooves 110a and the side grooves 110b are provided alternately.

[Excellent points of the seal ring according to this embodiment]
According to the above configuration, when the shaft 200 rotates in the forward direction, the side surface of the side surface groove 110a on the side of the shaft 200 in the forward rotation direction (that is, the side surface of the annular groove 210 with respect to the seal ring 100b during the forward rotation). The wedge effect produced by the inclination of the side surface on the sliding direction side can be obtained. On the other hand, when the shaft 200 rotates in the reverse direction, the side surface of the side surface groove 110b on the reverse rotation direction side of the shaft 200 (that is, the side surface on the sliding direction side of the side surface of the annular groove 210 with respect to the seal ring 100b during reverse rotation). It is possible to obtain a wedge effect that occurs when the is inclined. Therefore, the fluid to be sealed easily enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100b regardless of the rotation direction of the shaft 200 (in FIG. 9, the solid line arrow indicates that the shaft 200 is in the positive direction. The movement of the fluid to be sealed when it is rotated is shown, and the broken arrow indicates the movement of the fluid to be sealed when the shaft 200 is rotated in the reverse direction). Therefore, the fluid to be sealed that has leaked into the low pressure region (L) is easily returned by the high pressure region (H), and a lubricating film of the fluid to be sealed is more formed on the sliding portion between the side surface of the annular groove 210 and the seal ring 100b. It becomes easy to form.

<Example 4>
A seal ring according to Embodiment 4 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is different from the seal ring according to the first embodiment in the configuration of the groove. Note that the description of the same configuration and operation as in the first embodiment will be omitted.

[Configuration of seal ring]
FIG. 10 is a part of a side view of the seal ring 100c according to the present embodiment. FIG. 10 shows a side surface of the seal ring 100c on the low pressure region (L) side.

A plurality of

side grooves

110a and 110c are provided on the side surface on the low pressure region (L) side of the seal ring 100c according to the present embodiment. As in the second embodiment, the side groove 110a extends from the outer peripheral surface toward the inner peripheral surface to a position not reaching the inner peripheral surface, and the rotational direction of the shaft 200 from the outer peripheral surface toward the inner peripheral surface. In other words, it is configured to incline in the direction of sliding of the side surface of the annular groove 210 with respect to the seal ring 100c (in FIG. 10, the solid white arrow indicates the rotation direction of the shaft 200).

On the other hand, the side groove 110c extends from the inner peripheral surface toward the outer peripheral surface side to a position that does not reach the position exposed to the low pressure region (L), and the shaft 200 of the shaft 200 extends from the inner peripheral surface side toward the outer peripheral surface side. It is comprised so that it may incline in a rotation direction. Thereby, the side surface of the side surface groove 110c on the rotation direction side of the shaft 200 is inclined in the rotation direction of the shaft 200 from the inner peripheral surface side toward the outer peripheral surface side.

[Excellent points of the seal ring according to this embodiment]
According to the above configuration, the shaft 200 rotates and the side surface (the side surface on the low pressure region (L) side) of the annular groove 210 slides relative to the seal ring 100c, thereby sealing the high pressure region (H). The target fluid is taken into the side groove 110c. Since the fluid to be sealed taken into the side groove 110c enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100c, a lubricating film of the fluid to be sealed is more easily formed on the sliding portion.

Further, if the side groove 110c extending from the inner peripheral surface toward the outer peripheral surface side is provided in the seal ring 100c, the fluid to be sealed in the high pressure region (H) is easily sent to the low pressure region (L) side. The fluid to be sealed sent to the (L) side can be taken into the side groove 110a extending from the outer peripheral surface toward the inner peripheral surface side. Therefore, even when the side groove 110c is provided, the leakage amount of the fluid to be sealed from the high pressure region (H) to the low pressure region (L) can be suppressed (in FIG. 10, the arrow indicates the sealing Shows the movement of the target fluid).

[Others]
In the seal ring 100c according to the present embodiment, the side groove 110a and the side groove 110c are not necessarily configured to be inclined. That is, the side groove 110a and the side groove 110c may be configured to extend in the radial direction of the seal ring 100c. However, when the side surface groove 110a and the side surface groove 110c are inclined in the rotation direction of the shaft 200, a wedge effect occurs as described above. Therefore, the fluid to be sealed taken into the side surface groove 110a or the side surface groove 110c easily enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100c.

Further, in the case where the shaft 200 according to the present embodiment rotates in the reverse direction as well as the forward direction with respect to the housing 300 as in the third embodiment, the seal ring 100c according to the present embodiment may also be used. As in Example 3, between the adjacent side grooves 110a, the outer peripheral surface extends toward the inner peripheral surface to a position that does not reach the inner peripheral surface, and is inclined in a direction opposite to the side groove 110a. A groove 110a1 may be provided. Further, between the adjacent side grooves 110c, it extends from the inner peripheral surface toward the outer peripheral surface to a position that does not reach the position exposed to the low pressure region (L), and in the opposite direction to the side groove 110c. An inclined groove 110c1 may be provided (see FIG. 11).

According to this, when the shaft 200 rotates in the opposite direction, a wedge effect can be obtained in the groove 110a1 inclined in the opposite direction to the side groove 110a and the groove 110c1 inclined in the opposite direction to the side groove 110c. Therefore, the fluid to be sealed in the high pressure region (H) easily enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100c regardless of the rotation direction of the shaft 200. Therefore, the lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the side surface of the annular groove 210 and the seal ring 100c.

<Example 5>
A seal ring according to Embodiment 5 of the present invention will be described with reference to FIG. The seal ring according to the present embodiment is different from the seal ring according to the first embodiment in the configuration of the groove. Note that the description of the same configuration and operation as in the first embodiment will be omitted.

[Configuration of seal ring]
FIG. 12 is a part of a view of the seal ring 100d according to the present embodiment as viewed from the outer peripheral surface side. In the seal ring 100d according to the present embodiment, both side surfaces of the side surface groove 110d provided on the side surface on the low pressure region (L) side expand in the direction from the high pressure region (H) side toward the low pressure region (L) side. It is comprised so that it may incline.

[Excellent points of the seal ring according to this embodiment]
Also in the seal ring 100d according to the present embodiment, the sealing target fluid taken into the side groove 110a from the low pressure region (L) by sliding the seal ring 100d with respect to the shaft 200 is the same as in the first embodiment. The side groove 110d moves toward the inner peripheral surface along the side surface on the rotational direction side of the shaft 200 (that is, the side surface on the sliding direction side of the side surface of the annular groove 210 with respect to the seal ring 100d). At this time, if the side surface of the side groove 110d is inclined as described above, the fluid to be sealed moves also in the direction toward the low pressure region (L) along the side surface. As a result, in the side surface groove 110d, as in the case where the groove is inclined in the rotational direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side, a narrower portion in the wedge-shaped space is formed. Since the fluid to be sealed is sent in the direction, a wedge effect is produced. Therefore, the fluid to be sealed easily enters the sliding portion between the side surface of the annular groove 210 and the seal ring 100d.

[Others]
The seal ring 100d according to the present embodiment does not necessarily have to be configured such that both side surfaces of the side groove 110d are inclined. That is, if the side surface of the side surface groove 110d on the rotational direction side of the shaft 200 is inclined in the rotational direction of the shaft 200 from the high pressure region (H) side toward the low pressure region (L) side, the wedge effect as described above. Can be obtained.

Further, in the seal ring 100d according to the present embodiment, as in the second embodiment, the side surface groove 110d may be configured to be inclined in the rotational direction of the shaft 200 from the outer peripheral surface side toward the inner peripheral surface side. Good. According to this, due to the wedge effect, the fluid to be sealed easily enters through the sliding portion between the side surface of the annular groove 210 and the seal ring 100d.

<Example 6>
A seal ring according to Embodiment 6 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is different from the seal ring according to the first embodiment in the configuration of the groove. Note that the description of the same configuration as that of the first embodiment is omitted.

[Configuration of seal ring]
13 to 16 are diagrams showing the configuration of the seal ring 100e according to the present embodiment. 13 and 15 are side views of the seal ring 100e. FIG. 13 shows a side surface facing the low pressure region when the seal ring 100e is installed in the annular groove of the shaft, and FIG. 15 shows a high pressure region when the seal ring 100 is installed in the annular groove of the shaft. The side facing the side is shown. FIG. 14 shows the seal ring 100e as viewed from the outer peripheral surface side. 16 is a cross-sectional view taken along AA in FIG.

In the seal ring 100e according to the present embodiment, a plurality of grooves 110e are provided on the outer peripheral surface instead of the side groove 110 of the seal ring 100 according to the first embodiment. These grooves 110e are configured to extend from the side surface on the low pressure region side toward the high pressure region side to a position that does not reach the side surface on the high pressure region side. Hereinafter, the groove provided on the outer peripheral surface of such a seal ring is referred to as an outer peripheral surface groove.

[Operation of seal ring]
Next, the operation of the seal ring 100e according to the present embodiment will be described with reference to FIGS. 17 and 18 are partially broken perspective views showing the use state of the seal ring according to the present embodiment. FIG. 17 is a perspective view for easy understanding of the mechanism.

Similar to the seal ring 100 according to the first embodiment, the seal ring 100e according to the present embodiment is attached to the annular groove 210 provided on the outer periphery of the shaft 200, and seals the annular gap between the shaft 200 and the housing 300. To do. As a result, the high pressure region (H) where the fluid to be sealed such as oil is present is separated from the low pressure region (L). Here, the seal ring 100 is fixed to the side surface on the low pressure region (L) side of the annular groove 210 and the inner peripheral surface 310 of the shaft hole in the housing 300 by the fluid pressure of the fluid to be sealed in the high pressure region (H). By maintaining a close state, it exhibits sealing properties. In the case of the present embodiment, unlike the first embodiment, when the shaft 200 rotates with respect to the housing 300, the seal ring 100e rotates together with the shaft 200, and with respect to the inner peripheral surface 310 of the shaft hole in the shaft 200. Slide.

The outer peripheral surface groove 110e provided on the outer peripheral surface of the seal ring 100e does not reach the side surface on the high pressure region (H) side from the side surface on the low pressure region (L) side of the seal ring 100e toward the high pressure region (H) side. Extends to position.

In the seal ring 100e configured as described above, when the shaft 200 rotates and the seal ring 100e rotates, the outer peripheral surface of the seal ring 100e slides relative to the housing 300. In other words, the inner peripheral surface 310 of the shaft hole in the housing 300 slides relative to the seal ring 100e. As a result, the fluid to be sealed that has leaked from the high pressure region (H) to the low pressure region (L) is taken into the outer circumferential groove 110e (in FIGS. 17 and 18, the white arrow indicates the rotational direction of the shaft 200, that is, the seal ring). 100e rotation direction).

The fluid to be sealed taken into the outer peripheral surface groove 110e is the side surface of the outer peripheral surface groove 110e opposite to the rotation direction of the shaft 200 (that is, the sliding of the inner peripheral surface 310 of the shaft hole in the housing 300 with respect to the seal ring 100e). It moves toward the high pressure region (H) along the direction side surface. The sealing target fluid enters the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100e in the housing 300 due to the pressure generated with the movement of the sealing target fluid in the outer peripheral surface groove 110e. The fluid to be sealed that has entered the sliding portion returns to the high-pressure region (H) through the sliding portion (in FIG. 17, the arrow indicates the movement of the fluid to be sealed).

[Excellent points of the seal ring according to this embodiment]
As described above, according to the seal ring 100e according to the present embodiment, by providing the outer peripheral surface groove 110e, the fluid to be sealed leaked into the low pressure region (L) is taken into the outer peripheral surface groove 110e, and the The fluid to be sealed taken into the outer circumferential groove 110e is returned to the high pressure region (H). Therefore, the leakage amount of the fluid to be sealed from the high pressure region (H) to the low pressure region (L) can be suppressed.

Moreover, according to the seal ring 100e according to the present embodiment, the fluid to be sealed that has leaked into the low pressure region (L) is also returned to the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100e in the housing 300. Therefore, it becomes possible to stably form the lubricating film of the fluid to be sealed having a sufficient thickness at the sliding portion.

[Others]
In this embodiment, on the outer peripheral surface of the seal ring 110, an outer peripheral surface groove extending from one side surface to the other side surface and reaching the other side surface, and from the other side surface to the one side surface side. Both outer peripheral surface grooves extending to a position that does not reach one side surface may be provided. According to this, since it is not necessary to consider directionality when the seal ring 100e is mounted on the shaft 200, the mounting operation is facilitated. Further, when used in an apparatus in which the high pressure side and the low pressure side are alternately switched, the above-described effect can be obtained even when the high pressure side and the low pressure side are switched.

<Example 7>
A seal ring according to Embodiment 7 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is different from the seal ring according to the sixth embodiment in the configuration of the grooves. Note that a description of the same configuration and operation as in the sixth embodiment will be omitted.

[Configuration of seal ring]
FIG. 19 is a part of a view of the seal ring 100f according to the present embodiment as viewed from the outer peripheral surface side.

A plurality of outer peripheral surface grooves 110f are provided on the outer peripheral surface of the seal ring 100f according to the present embodiment. As in the sixth embodiment, these outer peripheral surface grooves 110f are configured to extend from the side surface on the low pressure region (L) side toward the high pressure region (H) side to a position that does not reach the side surface on the high pressure region (H) side. Has been. However, in the sixth embodiment, the outer peripheral groove 110e provided on the side surface of the seal ring 100e extends in the central axis direction of the seal ring 100. However, in this embodiment, the outer peripheral groove 110e is formed in the low pressure region (L ) Side toward the high pressure region (H) side, and is inclined in the direction opposite to the rotation direction of the shaft 200 (that is, the sliding direction of the inner peripheral surface 310 of the shaft hole in the housing 300 with respect to the seal ring 100f). (In FIGS. 19 and 20, the white arrow indicates the rotation direction of the shaft 200).

[Operation of seal ring and superior points of seal ring according to this embodiment]
Next, the operation of the seal ring 100f according to the present embodiment will be described with reference to FIG. FIG. 20 is a partially broken perspective view showing a use state of the seal ring according to the present embodiment. FIG. 20 is a perspective view for easy understanding of the mechanism.

In the seal ring 100f according to the present embodiment, the outer peripheral surface groove 110f is configured to incline in a direction opposite to the rotation direction of the shaft 200 from the low pressure region (L) side toward the high pressure region (H) side. Yes. Thereby, the side surface opposite to the rotation direction of the shaft 200 in the outer peripheral surface groove 110f is inclined in the direction opposite to the rotation direction of the shaft 200 from the low pressure region (L) side toward the high pressure region (H) side. It has become.

Also in the seal ring 100f according to the present embodiment, as in the first embodiment, the inner peripheral surface 310 of the shaft hole in the housing 300 slides relative to the seal ring 100f so that the low pressure region (L) changes to the outer peripheral groove 110f. The taken fluid to be sealed moves toward the high pressure region (H) along the side surface of the outer peripheral surface groove 110f opposite to the rotation direction of the shaft 200, and the inner peripheral surface 310 of the shaft hole in the housing 300. And the seal ring 100f (see the arrow in FIG. 20 indicates the movement of the fluid to be sealed).

At this time, if the side surface of the outer peripheral surface groove 110f opposite to the rotation direction side of the shaft 200 is inclined as described above, the outer peripheral surface groove 110f faces the narrower portion of the wedge-shaped space. Since the fluid to be sealed is sent in, the wedge effect is produced. Therefore, the fluid to be sealed easily enters the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100f in the housing 300. Therefore, the fluid to be sealed leaked to the low pressure region (L) is easily returned by the high pressure region (H), and the fluid to be sealed is formed in the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100f in the housing 300. The lubricating film is more easily formed.

<Example 8>
A seal ring according to Embodiment 8 of the present invention will be described with reference to FIG. The seal ring according to the present embodiment is different from the seal ring according to the sixth embodiment in the configuration of the grooves. Note that a description of the same configuration and operation as in the sixth embodiment will be omitted.

[Configuration of seal ring]
FIG. 21 is a part of a view of the seal ring 100g according to the present embodiment as viewed from the outer peripheral surface side.

In this embodiment, the shaft 200 rotates with respect to the housing 300 not only in the forward direction but also in the reverse direction. A plurality of outer

peripheral surface grooves

110f and 110g are provided on the outer peripheral surface of the seal ring 100g according to the present embodiment. As in the sixth embodiment, these outer

peripheral surface grooves

110f and 110g extend from the side surface on the low pressure region (L) side toward the high pressure region (H) side to a position that does not reach the side surface on the high pressure region (H) side. It is configured.

The outer peripheral surface groove 110f is configured to incline in the opposite direction (reverse rotation direction) to the forward rotation direction of the shaft 200 from the side surface on the low pressure region (L) side toward the high pressure region (H) side. On the other hand, the outer peripheral surface groove 110g is configured to incline in the direction (forward rotation direction) opposite to the reverse rotation direction of the shaft 200 from the side surface on the low pressure region (L) side toward the high pressure region (H) side. (In FIG. 21, the solid white arrow indicates the forward rotation direction of the shaft 200, and the broken white arrow indicates the reverse rotation direction of the shaft 200). The outer peripheral surface grooves 110f and the outer peripheral surface grooves 110g are provided alternately.

[Excellent points of the seal ring according to this embodiment]
According to the above configuration, when the shaft 200 rotates in the forward direction, the side surface of the outer peripheral surface groove 110f opposite to the forward rotation direction of the shaft 200 (that is, the shaft hole of the housing 300 with respect to the seal ring 100g). The wedge effect produced by the inclination of the inner circumferential surface 310 on the side in the sliding direction during forward rotation) can be obtained. On the other hand, when the shaft 200 rotates in the reverse direction, the side surface of the outer peripheral surface groove 110g opposite to the reverse rotation direction of the shaft 200 (that is, reverse rotation of the inner peripheral surface 310 of the shaft hole in the housing 300 with respect to the seal ring 100g). It is possible to obtain a wedge effect that occurs when the side surface on the sliding direction side is inclined. Therefore, the fluid to be sealed easily enters the sliding portion between the inner peripheral surface 310 of the shaft hole in the housing 300 and the seal ring 100g regardless of the rotation direction of the shaft 200 (in FIG. 21, the solid line arrow indicates The movement of the fluid to be sealed when the shaft 200 rotates in the forward direction indicates the movement of the fluid to be sealed when the shaft 200 rotates in the reverse direction. Therefore, the fluid to be sealed that has leaked to the low pressure region (L) is easily returned by the high pressure region (H), and the fluid to be sealed is formed in the sliding portion between the inner peripheral surface 310 of the shaft hole in the housing 300 and the seal ring 100g. The lubricating film is more easily formed.

<Example 9>
A seal ring according to Embodiment 9 of the present invention will be described with reference to FIGS. The seal ring according to the present embodiment is different from the seal ring according to the sixth embodiment in the configuration of the grooves. Note that a description of the same configuration and operation as in the sixth embodiment will be omitted.

[Configuration of seal ring]
FIG. 22 is a part of a view of the seal ring 100h according to the present embodiment as viewed from the outer peripheral surface side.

A plurality of outer

peripheral grooves

110f and 110h are provided on the outer peripheral surface of the seal ring 100h according to the present embodiment. The outer peripheral surface groove 110f extends from the side surface on the low pressure region (L) side to the position not reaching the side surface on the high pressure region (H) side from the side surface on the low pressure region (L) side, as in the sixth embodiment. From the (L) side toward the high pressure region (H) side, the direction of rotation of the shaft 200 is inclined in the opposite direction (that is, the sliding direction of the inner peripheral surface 310 of the shaft hole in the housing 300 with respect to the seal ring 100h). (In FIG. 22, a solid white arrow indicates the rotation direction of the shaft 200).

On the other hand, the outer peripheral surface groove 110h extends from the side surface on the high pressure region (H) side toward the low pressure region (L) side to a position that does not reach the side surface on the low pressure region (L) side, and on the high pressure region (H) side. To the low pressure region (L) side so as to incline in a direction opposite to the rotation direction of the shaft 200. Thereby, the side surface opposite to the rotation direction side of the shaft 200 in the outer circumferential surface groove 110h is opposite to the rotation direction of the shaft 200 from the side surface on the high pressure region (H) side toward the low pressure region (L) side. It has an inclined configuration.

[Excellent points of the seal ring according to this embodiment]
According to the above configuration, the shaft 200 rotates, and the inner peripheral surface 310 of the shaft hole in the housing 300 slides with respect to the seal ring 100h, so that the fluid to be sealed in the high pressure region (H) is the outer peripheral surface. It is taken into the groove 110h. Then, since the fluid to be sealed taken into the outer peripheral surface groove 110h enters the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100h in the housing 300, a lubricating film of the fluid to be sealed is further added to the sliding portion. It becomes easy to form.

When the outer peripheral surface groove 110h extending from the side surface on the high pressure region (H) side to the low pressure region (L) side is provided in the seal ring 100h, the fluid to be sealed in the high pressure region (H) is on the low pressure region (L) side. However, the fluid to be sealed sent to the low pressure region (L) side can be taken into the outer peripheral surface groove 110f extending from the side surface on the low pressure region (L) side toward the high pressure region (H) side. Therefore, even if the outer peripheral surface groove 110h is provided, the leakage amount of the fluid to be sealed from the high pressure region (H) to the low pressure region (L) can be suppressed (in FIG. 22, the arrow indicates It shows the movement of the fluid to be sealed).

[Others]
In the seal ring 100h according to the present embodiment, the outer peripheral surface groove 110f and the outer peripheral surface groove 110h are not necessarily configured to be inclined. That is, the outer peripheral surface groove 110f and the outer peripheral surface groove 110h may be configured to extend in the central axis direction of the seal ring 100h. However, when the outer peripheral surface groove 110f and the outer peripheral surface groove 110h are inclined in the direction opposite to the rotation direction of the shaft 200, the wedge effect is generated as described above. Therefore, the fluid to be sealed taken into the outer peripheral surface groove 110f and the outer peripheral surface groove 110h can easily enter the sliding portion between the side surface of the annular groove 210 and the seal ring 100c.

Further, in the case where the shaft 200 according to the present embodiment rotates not only in the forward direction but also in the reverse direction with respect to the housing 300 as in the eighth embodiment, the seal ring 100h according to the present embodiment may also be used. As in Example 8, between the adjacent outer peripheral surface grooves 110f, from the side surface on the low pressure region (L) side to the position that does not reach the side surface on the low pressure region (L) side toward the high pressure region (H) side. A groove 110f1 that extends and is inclined in a direction opposite to the outer circumferential surface groove 110f may be provided. Further, between the adjacent outer peripheral surface grooves 110h, it extends from the side surface on the high pressure region (H) side toward the low pressure region (L) side to a position not reaching the side surface on the low pressure region (L) side, and A groove 110h1 inclined in a direction opposite to the outer circumferential groove 110h may be provided (see FIG. 23).

According to this, when the shaft 200 rotates in the opposite direction, a wedge effect can be obtained in the groove 110f1 inclined in the opposite direction to the outer peripheral face groove 110f and the groove 110h1 inclined in the opposite direction to the outer peripheral face groove 110h. it can. Therefore, the fluid to be sealed in the high pressure region (H) easily enters the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100 h in the housing 300 regardless of the rotation direction of the shaft 200. Therefore, the lubricating film of the fluid to be sealed is more easily formed on the sliding portion between the inner peripheral surface 310 of the shaft hole in the housing 300 and the seal ring 100h.

<Example 10>
A seal ring according to Embodiment 10 of the present invention will be described with reference to FIG. The seal ring according to the present embodiment is different from the seal ring according to the sixth embodiment in the configuration of the grooves. Note that a description of the same configuration and operation as in the sixth embodiment will be omitted.

[Configuration of seal ring]
FIG. 24 is a part of a side view of the seal ring 100i according to the present embodiment. FIG. 24 shows a side surface facing the low pressure region side when the seal ring 100i is mounted in the annular groove of the shaft. In the seal ring 100i according to the present embodiment, both side surfaces of the outer peripheral surface groove 110i provided on the outer peripheral surface are inclined so as to expand from the inner peripheral surface side toward the outer peripheral surface side.

[Excellent points of the seal ring according to this embodiment]
Also in the seal ring 100i according to the present embodiment, the sealing target fluid taken into the outer peripheral groove 110i from the low pressure region (L) by sliding the seal ring 100i with respect to the housing 300 is the same as in the sixth embodiment. A high pressure region (H) along a side surface of the outer peripheral surface groove 110i opposite to the rotation direction of the shaft 200 (that is, a side surface on the sliding direction side of the inner peripheral surface 310 of the shaft hole in the housing 300 with respect to the seal ring 100i). Move towards the side. At this time, when the side surface of the outer peripheral surface groove 110i is inclined as described above, the fluid to be sealed moves also in the direction toward the outer peripheral surface side along the side surface. Thereby, in the outer peripheral surface groove | channel 110i, it is the same as the case where it is comprised so that a groove | channel may incline in the direction opposite to the rotation direction of the axis | shaft 200 toward the high voltage | pressure area | region (H) side from the low voltage | pressure area | region (L) side. Since the fluid to be sealed is fed toward a narrower portion in the wedge-shaped space, a wedge effect is generated. Therefore, the fluid to be sealed easily enters the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100 i in the housing 300.

[Others]
Note that the seal ring 100i according to the present embodiment does not necessarily have to be configured such that both side surfaces of the outer peripheral surface groove 110i are inclined. That is, if the side surface of the outer peripheral surface groove 110i opposite to the rotation direction of the shaft 200 is inclined in the direction opposite to the rotation direction of the shaft 200 from the inner peripheral surface side to the outer peripheral surface side, as described above. A wedge effect can be obtained.

Further, also in the seal ring 100i according to the present embodiment, as in the sixth embodiment, the outer circumferential groove 110i is in a direction opposite to the rotation direction of the shaft 200 from the low pressure region (L) side to the high pressure region (H) side. It may be configured to incline. According to this, due to the wedge effect, the fluid to be sealed can easily enter through the sliding portion between the inner peripheral surface 310 of the shaft hole and the seal ring 100 i in the housing 300.

100, 100a, 100b, 100c, 100d, 100e, 110f, 110g, 110h,

110i Seal ring

110, 110a, 110b, 110c,

110d Side groove

110e, 110f, 110g, 110h, 110i Outer surface groove 200 Axis 210 Annular groove 300 Housing 310 Inner peripheral surface C Cut part

Claims

A seal ring that is mounted in an annular groove provided on the outer periphery of the shaft and seals an annular gap between the relatively rotating shaft and the housing and separates the high-pressure region and the low-pressure region where the fluid to be sealed exists. Because
The position exposed to the low pressure region on the side surface on the low pressure region side for use in applications where the side surface on the low pressure region side and the side surface of the annular groove slide relative to each other when the shaft and the housing rotate relatively Side groove, which is a groove extending from the inner peripheral surface side to the position not reaching the inner peripheral surface,
Or
When the shaft and the housing are rotated relatively, the outer peripheral surface and the inner peripheral surface of the shaft hole in the housing are slid relative to each other. A seal ring provided with any one of outer peripheral surface grooves which are grooves extending to a position that does not reach the side surface on the high-pressure region side toward the side.
Comprising the side groove,
The wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring in the side surface groove is inclined in the sliding direction of the side surface of the annular groove with respect to the seal ring from the outer peripheral surface side toward the inner peripheral surface side. The seal ring according to claim 1.
The shaft and the housing rotate relatively not only in the forward direction but also in the reverse direction,
A plurality of the side grooves are provided on the side surface on the low pressure region side,
In some of the side grooves, the wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring at the time of forward rotation is directed from the outer peripheral surface side to the inner peripheral surface side. Inclined in the sliding direction during rotation,
The wall surface on the sliding direction side when the side surface of the annular groove is reversely rotated with respect to the seal ring in the other part of the side surface groove is the side surface of the annular groove with respect to the seal ring from the outer peripheral surface side toward the inner peripheral surface side. The seal ring according to claim 2, wherein the seal ring is inclined in a sliding direction during reverse rotation.
Comprising the side groove,
The side groove is a first side groove,
The side surface of the said low voltage | pressure area | region side is further equipped with the 2nd side surface groove | channel extended to the position which does not reach the position exposed to a low voltage | pressure area | region from an inner peripheral surface toward an outer peripheral surface side. The seal ring described.
The wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring in the second side surface groove is in the sliding direction of the side surface of the annular groove with respect to the seal ring from the inner peripheral surface side toward the outer peripheral surface side. The seal ring according to claim 4 which is inclined.
The shaft and the housing rotate relatively not only in the forward direction but also in the reverse direction,
A plurality of the second side grooves are provided on the side surface on the low pressure region side,
The wall surface on the sliding direction side of the side surface of the annular groove with respect to the seal ring at the time of forward rotation in a part of the second side surface groove extends from the inner peripheral surface side toward the outer peripheral surface side. Inclined in the sliding direction during normal rotation of the side,
In the other part of the second side surface groove, the wall surface on the sliding direction side when the side surface of the annular groove with respect to the seal ring is rotated in the reverse direction, from the inner peripheral surface side toward the outer peripheral surface side, the annular surface with respect to the seal ring The seal ring according to claim 5, wherein the seal ring is inclined in a sliding direction during reverse rotation of the side surface of the groove.
Comprising the outer peripheral groove,
The inner peripheral surface of the shaft hole in the housing with respect to the seal ring is a wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the outer peripheral surface groove from the low pressure region side to the high pressure region side. The seal ring according to claim 1, wherein the seal ring is inclined in the sliding direction.
The shaft and the housing rotate relatively not only in the forward direction but also in the reverse direction,
A plurality of the outer peripheral surface grooves are provided on the outer peripheral surface,
The wall surface on the sliding direction side during the forward rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in a part of the outer peripheral surface groove in the housing with respect to the seal ring from the low pressure region side toward the high pressure region side. Inclined in the sliding direction during forward rotation of the inner peripheral surface of the shaft hole,
The wall surface on the sliding direction side at the time of reverse rotation of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the other part of the outer peripheral surface groove is from the low pressure region side toward the high pressure region side. The seal ring according to claim 7, wherein the seal ring is inclined in a sliding direction during reverse rotation of the inner peripheral surface of the shaft hole in the housing.
Comprising the outer peripheral groove,
The outer circumferential groove is a first outer circumferential groove,
The said outer peripheral surface is further equipped with the 2nd outer peripheral surface groove | channel further extended to the position which does not reach the side surface of the low voltage | pressure area | region side from the side surface of the high voltage | pressure area | region side toward the low voltage | pressure area | region side. The seal ring according to item.
The wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the second outer peripheral surface groove extends from the high pressure region side toward the low pressure region side. The seal ring according to claim 9, wherein the seal ring is inclined in the sliding direction of the inner peripheral surface.
The shaft and the housing rotate relatively not only in the forward direction but also in the reverse direction,
A plurality of the second outer peripheral surface grooves are provided on the outer peripheral surface,
The wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in a part of the second outer peripheral surface groove is a shaft in the housing with respect to the seal ring from the high pressure region side toward the low pressure region side. Inclined in the sliding direction during positive rotation of the inner peripheral surface of the hole,
The wall surface on the sliding direction side of the inner peripheral surface of the shaft hole in the housing with respect to the seal ring in the other part of the second outer peripheral surface groove, the housing with respect to the seal ring from the high pressure region side toward the low pressure region side. The seal ring according to claim 10, wherein the seal ring is inclined in a sliding direction during reverse rotation of the inner peripheral surface of the shaft hole.