JP2015034592A - Seal ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal ring capable of stabilizing a leakage amount of a sealed fluid.SOLUTION: A resin-made seal ring 100 mounted in an annular groove 210 formed on an outer periphery of a shaft 200, seals an annular clearance between the shaft 200 and a housing 300 which are relatively moved. The resin-made seal ring 100 is closely contacted to: a side wall surface on the low pressure side (L) of the annular groove 210; and an inner peripheral surface of a shaft hole through which the shaft 200 is inserted, of the housing 300. In the resin-made seal ring 100, a through hole 120 is formed in a state of penetrating from the inner peripheral surface of the shaft hole up to a position exposed to the annular clearance between the shaft 200 and the housing 300, in the side wall surface on the low pressure-side (L). The through hole 120 allows sealed fluid to leak to a region on the low pressure side (L).

Description

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

  Generally, a seal ring is used to prevent leakage of a fluid to be sealed such as oil by sealing an annular gap between a shaft and a housing. However, for the purpose of improving the lubricity of the sliding portion, a structure in which the fluid to be sealed leaks to some extent may be employed (see Patent Documents 1 and 2). Such a conventional seal ring will be described with reference to FIGS.

  FIG. 15 is a side view of a seal ring according to a conventional example. FIG. 16 is a schematic cross-sectional view showing a use state of a seal ring according to a conventional example. Note that the seal ring in FIG. 16 is an AA cross-sectional view of the seal ring shown in FIG. As shown in FIG. 16, 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 shaft 200 and the housing 300 that move relatively. When the shaft 200 and the housing 300 are configured to rotate relatively, the shaft 200 and the housing 300 may be configured to relatively rotate and reciprocate when configured to relatively reciprocate. .

  The seal ring 500 is against the inner peripheral surface of the shaft hole in the housing 300 and the side wall surface of the annular groove 210 on the side opposite to the sealing region side (high pressure side (H)) (low pressure side (L)). Each is configured to be in close contact. In general, the peripheral length of the outer peripheral surface of the seal ring 500 is configured to be shorter than the peripheral length of the inner peripheral surface of the shaft hole of the housing 300. Thus, the seal ring 500 is configured so as not to have a tightening margin with respect to the inner peripheral surface of the shaft hole. When the pressure on the high pressure side (H) increases, the seal ring 500 expands in diameter and comes into close contact with the inner peripheral surface of the shaft hole and the side wall surface of the annular groove 210. Thereby, the annular clearance between the shaft 200 and the housing 300 is sealed. In addition, the seal ring 500 according to this conventional example is provided with an abutment portion 510 at one place in the circumferential direction so as to improve the wearability and facilitate the diameter expansion.

  In addition, when the shaft 200 and the housing 300 are relatively moved, when the seal ring 500 is designed to slide only with respect to the side wall surface of the annular groove 210, the seal ring 500 has a shaft hole. When the seal ring 500 is designed to slide only with respect to the inner peripheral surface, the seal ring 500 may be designed to slide with respect to both the side wall surface of the annular groove 210 and the inner peripheral surface of the shaft hole. . In the illustrated conventional example, the shaft 200 and the housing 300 are configured to rotate relatively, and the seal ring 500 is designed to slide only on the side wall surface of the annular groove 210. .

  In this conventional example, in order to improve the lubricity of various members provided on the sliding portion between the seal ring 500 and the side wall surface of the annular groove 210 and the low pressure side (L), FIG. As shown in FIG. 16, a groove 520 extending from the inner peripheral surface to the outer peripheral surface is provided on the side wall surface of the seal ring 500. By providing such a groove 520, leakage of the fluid to be sealed from the high pressure side (H) to the low pressure side (L) is allowed. In this way, by allowing leakage of the fluid to be sealed, it is possible to improve the lubricity of the sliding part and various members.

  Here, the amount of leakage of the fluid to be sealed is desirably controlled to be a constant amount in order to achieve both sealing performance and lubricity. However, in the case of the seal ring 500 according to the conventional example, it is difficult to stably control the leakage amount. The reason will be described below.

  The amount of leakage varies depending on the radial width (hereinafter referred to as the seal width) in the contact region between the seal ring 500 and the side wall surface of the annular groove 210. For example, if the side wall surface of the annular groove 210 is formed perpendicular to the groove bottom surface, S1 in FIG. 16 is the seal width. However, when the side wall surface of the annular groove 210 is inclined (see 210X in FIG. 16), S2 is the seal width. And the amount of leakage increases as the seal width becomes narrower. Accordingly, the seal width changes and the amount of leakage changes depending on the processing accuracy of the annular groove 210.

  Further, the sliding portion of the seal ring 500 wears with time due to sliding with the side wall surface of the annular groove 210. FIG. 17 shows a state in which wear of the seal ring 500 has progressed. As can be seen from FIG. 17, the depth of the groove 520 decreases with time, and the cross-sectional area of the leakage passage T decreases with time. Accordingly, the leakage amount decreases with time.

  FIG. 18 is a graph showing the relationship between the durability test time and the leakage amount in the seal ring according to the conventional example. The durability test is as follows. That is, using a PTFE seal ring with an outer diameter of 30 mm, the amount of leakage with respect to elapsed time was measured under the conditions of a rotational speed of 7000 rpm and a hydraulic pressure of 2 MPa in an environment of 120 ° C. In the drawing, L1 indicates a case where the seal width is 2 mm, L2 indicates a case where the seal width is 0.5 mm, and L3 indicates a case where the seal width is 0.2 mm. From this graph, it can be seen that the narrower the seal width, the greater the amount of leakage and the smaller the amount of leakage over time.

  As described above, in the case of the seal ring 500 according to the conventional example, it is difficult to stably control the leakage amount.

  A configuration in which a groove extending in the axial direction is provided on the outer peripheral surface side of the seal ring may be employed. Also in this case, the amount of leakage decreases with time due to sliding wear, as in the case of the seal ring 500. Further, when a groove is provided on the outer peripheral surface side, the fluid to be sealed escapes from the high pressure side (H) to the low pressure side (L) without the outer peripheral surface of the seal ring being in contact with the inner peripheral surface of the shaft hole. There is another problem that the phenomenon is likely to occur.

Japanese Patent No. 4686809 Japanese Patent No. 4560893 Utility Model Registration No. 2526744

  An object of the present invention is to provide a seal ring that stabilizes the leakage amount of a fluid to be sealed.

  The present invention employs the following means in order to solve the above problems.

That is, the seal ring of 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 shaft and the housing that moves relatively,
In the resin seal ring that is in close contact with the side wall surface opposite to the sealing region side in the annular groove and the inner peripheral surface of the shaft hole through which the shaft in the housing is inserted,
Penetrating from the inner peripheral surface to the position exposed to the annular gap between the shaft and the housing on the side wall surface opposite to the sealed region side, and leaking the fluid to be sealed to the region opposite to the sealed region side A hole is provided.

  According to the present invention, the fluid to be sealed can be leaked to the region opposite to the sealed region side by the through hole. And the through-hole is comprised so that it may penetrate to the position exposed to the annular clearance between an axis | shaft and a housing among the side wall surfaces on the opposite side to the sealing area | region side from an internal peripheral surface. Therefore, even if the seal ring is worn by sliding, the cross-sectional area of the through hole (corresponding to the cross-sectional area of the passage through which the fluid to be sealed leaks) does not change. Moreover, even if the contact area between the seal ring and the side wall surface changes due to the inclination of the side wall surface of the annular groove due to the processing accuracy of the annular groove, the through hole is not affected. From the above, the leakage amount of the fluid to be sealed can be stabilized.

  As described above, according to the present invention, it is possible to stabilize the leakage amount of the fluid to be sealed.

1 is a side view of a seal ring according to Embodiment 1 of the present invention. FIG. 2 is a view as seen from the outer peripheral surface side of the seal ring according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the seal ring according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing a usage state of the seal ring according to the first embodiment of the present invention. FIG. 5 is a side view of a seal ring according to Embodiment 2 of the present invention. FIG. 6 is a schematic cross-sectional view of a seal ring according to Embodiment 2 of the present invention. FIG. 7 is a side view of a seal ring according to Embodiment 3 of the present invention. FIG. 8 is a schematic cross-sectional view of a seal ring according to Embodiment 3 of the present invention. FIG. 9 is a side view of a seal ring according to Embodiment 4 of the present invention. FIG. 10 is a schematic cross-sectional view of a seal ring according to Embodiment 4 of the present invention. FIG. 11 is a side view of a seal ring according to Embodiment 5 of the present invention. FIG. 12 is a schematic cross-sectional view of a seal ring according to Embodiment 5 of the present invention. FIG. 13 is a side view of a seal ring according to Embodiment 6 of the present invention. FIG. 14 is a schematic cross-sectional view of a seal ring according to Embodiment 6 of the present invention. FIG. 15 is a side view of a seal ring according to a conventional example. FIG. 16 is a schematic cross-sectional view showing a use state of a seal ring according to a conventional example. FIG. 17 is a schematic cross-sectional view showing a state in which wear of the seal ring according to the conventional example has advanced. FIG. 18 is a graph showing the relationship between the durability test time and the leakage amount in the seal ring according to the conventional example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. . The seal ring according to the present embodiment described below is suitably used for hydraulic equipment provided in various devices in addition to hydraulic equipment provided in the automobile.

Example 1
With reference to FIGS. 1-4, the seal ring which concerns on Example 1 of this invention is demonstrated. The seal ring 100 according to the present embodiment is attached to an annular groove 210 provided on the outer periphery of the shaft 200 and seals an annular gap between the relatively moving shaft 200 and the housing 300. When the shaft 200 and the housing 300 are configured to rotate relatively, the shaft 200 and the housing 300 may be configured to relatively rotate and reciprocate when configured to relatively reciprocate. . The seal ring 100 according to the present embodiment is applicable to any of these cases.

<Seal ring>
In particular, the configuration of the seal ring 100 according to the present embodiment will be described with reference to FIGS. 1 is a side view of a seal ring 100 according to Embodiment 1 of the present invention, FIG. 2 is a view as seen from the outer peripheral surface side of the seal ring 100 according to Embodiment 1 of the present invention, and FIG. It is typical sectional drawing of the seal ring 100 which concerns on Example 1 of this. 3 is a cross-sectional view taken along the line AA in FIG.

  The seal ring 100 according to the present embodiment is made of a resin material. Preferable examples of the material of the seal ring 100 include polyether ether ketone (PEEK), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE). Further, the circumferential length of the outer circumferential surface of the seal ring 100 is configured to be shorter than the circumferential length of the inner circumferential surface of the shaft hole of the housing 300. That is, the seal ring 100 is configured not to have a tightening margin with respect to the inner peripheral surface of the shaft hole. Accordingly, the outer peripheral surface of the seal ring 100 does not contact the inner peripheral surface of the shaft hole of the housing 300 when no external force is applied.

  The seal ring 100 is provided with an abutment portion 110 at one place in the circumferential direction. Further, the seal ring 100 is provided with a through hole 120 that penetrates from the inner peripheral surface to a position near the outer peripheral surface of one side wall surface. The seal ring 100 according to the present embodiment has a configuration in which the above-described joint portion 110 and the through hole 120 are formed on an annular member having a rectangular cross section. However, this is merely a description of the shape, and does not necessarily mean that a circular member having a rectangular cross section is used as a material, and a process for forming the joint portion 110 and the through hole 120 is performed on them. Of course, after the annular member having a rectangular cross section is formed, the joint portion 110 and the through hole 120 can be obtained by cutting. However, for example, the through hole 120 may be obtained by cutting after molding a material having the joint portion 110 in advance. Thus, a manufacturing method is not specifically limited.

  The joint portion 110 employs a so-called special step cut that is cut in a step shape when viewed from either the outer peripheral surface side or both side wall surfaces. Thereby, in the seal ring 100, the first fitting convex portion 111a and the first fitting concave portion 111b are provided on the outer peripheral side on one side via the cutting portion, and the first outer peripheral side on the other side is provided with the first. A second fitting concave portion 112b into which the fitting convex portion 111a is fitted and a second fitting convex portion 112a to be fitted into the first fitting concave portion 111b are provided. The special step cut has a characteristic of maintaining stable sealing performance even if the circumference of the seal ring 100 changes due to thermal expansion and contraction. Since the special step cut is a known technique, detailed description thereof is omitted.

  Here, the case of the special step cut was shown as an example of the joint part 110. However, the abutment portion 110 is not limited to this, and straight cut, bias cut, step cut, and the like may be employed. The step cut is a structure that is cut in a step shape when viewed from either the outer peripheral surface side or the inner peripheral surface side. Further, when a low elastic material (PTFE or the like) is adopted as the material of the seal ring 100, the end portion may be provided without providing the joint portion 110.

<Mechanism when using seal ring>
In particular, with reference to FIG. 4, the mechanism at the time of use of the seal ring 100 which concerns on a present Example is demonstrated. In FIG. 4, the left side is the high pressure side (H) on the sealed region side where the fluid to be sealed such as oil is sealed, and the right side is the low pressure side (L) opposite to the sealed region side.

  As described above, the seal ring 100 is mounted in the annular groove 210 provided in the shaft 200. In addition, as described above, the outer peripheral surface of the seal ring 100 does not contact the inner peripheral surface of the shaft hole of the housing 300 when no external force is applied. When the pressure of the fluid to be sealed is received from the high pressure side (H), the seal ring 100 is pushed by the low pressure side (L) and receives a force from the inner peripheral surface side to expand the diameter. As a result, the seal ring 100 is in close contact with the low pressure side (L) side wall surface of the annular groove 210 and the inner peripheral surface of the shaft hole through which the shaft 200 of the housing 300 is inserted.

  In addition, when the shaft 200 and the housing 300 are relatively moved, when the seal ring is designed to slide only on the side wall surface of the annular groove 210, the seal ring has an inner periphery of the shaft hole. When the seal ring is designed to slide only with respect to the surface, the seal ring may be designed to slide with respect to both the side wall surface of the annular groove 210 and the inner peripheral surface of the shaft hole. The seal ring 100 according to the present embodiment is applicable to any case.

  The seal ring 100 according to the present embodiment is attached to the annular groove 210 so that the side wall surface on the side where the opening of the through hole 120 is provided faces the low pressure side (L). The Accordingly, the through hole 120 is configured to penetrate from the inner peripheral surface of the seal ring 100 to a position exposed to the annular gap between the shaft 200 and the housing 300 on the low-pressure side (L) side wall surface. Therefore, the through hole 120 exerts a function of leaking the fluid to be sealed from the high pressure side (H) region to the low pressure side (L) region (see arrows in FIG. 4).

<Excellent points of seal ring according to this embodiment>
According to the seal ring 100 according to the present embodiment, the fluid to be sealed can be leaked from the region on the high pressure side (H) to the region on the low pressure side (L) through the through hole 120. The through hole 120 is configured to penetrate from the inner peripheral surface of the seal ring 100 to a position exposed to the annular gap between the shaft 200 and the housing 300 on the low-pressure side (L) side wall surface. Therefore, even if the seal ring 100 is worn by sliding, the cross-sectional area of the through hole 120 (corresponding to the cross-sectional area of the passage through which the fluid to be sealed leaks) does not change. Further, even if the contact area between the seal ring 100 and the side wall surface varies due to the inclination of the side wall surface of the annular groove 210 depending on the processing accuracy of the annular groove 210, the through hole 120 is not affected. From the above, the leakage amount of the fluid to be sealed can be stabilized. In processing the through hole 120, the larger the hole diameter, the easier it is to process, but the larger the hole diameter, the greater the amount of leakage. However, since the through hole 120 extends obliquely from the inner peripheral surface of the seal ring 100 toward the side wall surface on the low pressure side (L), the distance can be made relatively long. Thereby, pipe resistance can be enlarged and the amount of leaks can be controlled.

  Further, in the seal ring 100 according to the present embodiment, as in the case where a groove is provided on the outer peripheral surface side, the outer peripheral surface of the seal ring does not contact the inner peripheral surface of the shaft hole, and the fluid to be sealed is on the high pressure side ( There is no possibility that the phenomenon of falling from the H) to the low pressure side (L) is likely to occur.

Further, when a groove is provided on the side wall surface or outer peripheral surface of the seal ring, the lubrication state of the sliding portion is different from that of the seal ring not provided with the groove. Also, the lubrication state of the sliding portion varies depending on the size of the groove. Therefore, an endurance evaluation test is required every time the design is changed. On the other hand, in the case of the seal ring 100 according to the present embodiment, there is an advantage that even if the design of the size of the through hole 120 is changed, it is not necessary to perform the durability evaluation test again. Moreover, it is a case where it is used for the structure where the sealing region is switched (that is, the high pressure side (H) and the low pressure side (L) are switched in FIG. 4), and it is necessary to leak the fluid to be sealed in a stable amount only in one direction. When there is, the seal ring 100 according to the present embodiment can be suitably used. That is, in the seal ring 100 according to the present embodiment, as shown in FIG. 4, when the left side is the high pressure side (H) and the right side is the low pressure side (L), the fluid to be sealed is supplied in a stable amount. Can be leaked. On the other hand, when the right side becomes the high pressure side (H) and the left side becomes the low pressure side (L), the fluid to be sealed hardly leaks to the left side. In addition, when a groove | channel is provided in the outer peripheral surface side, since the sealing object fluid leaks with respect to both directions, it cannot use in the above uses. Further, as described in the conventional example, if a groove is provided on the side surface, there is a problem that the amount of leakage becomes unstable due to wear.

(Example 2)
5 and 6 show a second embodiment of the present invention. In the said Example 1, the structure in case the through-hole penetrated from the inner peripheral surface of a seal ring to the position of the outer peripheral surface among one side wall surface was shown. In contrast, the present embodiment shows a configuration in which a through-hole penetrating from the inner peripheral surface of the seal ring to the position near the outer peripheral surface of the other side wall surface is further provided. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a side view of the seal ring 100 according to the second embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view of the seal ring 100 according to the second embodiment of the present invention. 6 is a cross-sectional view taken along AA in FIG.

  Also in the seal ring 100 according to the present embodiment, as in the case of the first embodiment, the abutment portion 110 and the through hole 120a penetrating from the inner peripheral surface to the position near the outer peripheral surface of the one side wall surface are provided. Yes. And in the seal ring 100 which concerns on a present Example, the through-hole 120b penetrated from the inner peripheral surface to the position of the outer peripheral surface vicinity among the other side wall surfaces is further provided. The configuration other than the point where the through hole 120b is provided is the same as the configuration of the seal ring 100 according to the first embodiment.

  In the case of the seal ring 100 according to the first embodiment, the seal ring 100 is arranged so that the side wall surface on the side where the opening of the through hole 120 is provided faces the low pressure side (L). It is necessary to attach to the annular groove 210. On the other hand, the seal ring 100 according to the present embodiment includes a through hole 120a in which an opening is provided on one side wall surface, and a through hole 120b in which an opening is provided on the other side wall surface. ing. Therefore, when the seal ring 100 is attached to the annular groove 210, the seal ring 100 may face either direction. That is, no matter which direction the seal ring 100 is attached to the annular groove 210, either the through hole 120 a or the through hole 120 b is on the low pressure side (L) side from the inner peripheral surface of the seal ring 100. It becomes a through-hole comprised so that it may penetrate to the position exposed to the annular clearance between the axis | shaft 200 and the housing 300 among wall surfaces. Therefore, the function of leaking the fluid to be sealed from the high-pressure side (H) region to the low-pressure side (L) region is exhibited by any one of the through holes.

  Further, in the case of the seal ring 100 according to the present embodiment, it can also be suitably used in a structure in which the sealing region is switched (that is, the high pressure side (H) and the low pressure side (L) are switched in FIG. 4). . That is, in FIG. 4, the fluid to be sealed can be leaked with a stable leakage amount in both cases where the left side is the high pressure side (H) and the right side is the high pressure side (H).

  As described above, also in the seal ring 100 according to the present embodiment, the same effect as that of the first embodiment can be obtained. Further, according to the seal ring 100 according to the present embodiment, the mounting workability in the annular groove 210 is superior to that in the first embodiment. Furthermore, the seal ring 100 according to the present embodiment can be suitably used in a structure in which the sealing region is switched.

Example 3
7 and 8 show a third embodiment of the present invention. In the said Example 1 and Example 2, the structure in case a through-hole extended straightly with respect to the radial direction of a seal ring was shown. On the other hand, in the present embodiment, in the seal ring according to the second embodiment, a configuration in which the through hole extends obliquely with respect to the radial direction of the seal ring is shown. Since other configurations and operations are the same as those in the first and second embodiments, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 7 is a side view of the seal ring 100 according to the third embodiment of the present invention, and FIG. 8 is a schematic cross-sectional view of the seal ring 100 according to the third embodiment of the present invention. 8 is a cross-sectional view taken along AA in FIG.

  Also in the seal ring 100 according to the present embodiment, as in the case of the second embodiment, the joint portion 110, the through hole 120c penetrating from the inner peripheral surface to the position near the outer peripheral surface of one side wall surface, and the inner peripheral surface A through-hole 120d that penetrates from the surface to the position near the outer peripheral surface of the other side wall surface is provided. In the second embodiment, the through holes 120a and 120b are both configured to extend straight in the radial direction of the seal ring 100, whereas in the case of the seal ring 100 according to the present embodiment, The through holes 120c and 120d are configured to extend obliquely with respect to the radial direction of the seal ring 100. Other configurations are the same as the configuration of the seal ring 100 according to the second embodiment.

  As described above, also in the seal ring 100 according to the present embodiment, the same effect as in the second embodiment can be obtained. In the present embodiment, the lengths of the through holes 120a and 120b can be made longer than those in the first and second embodiments. Thereby, pipe resistance can be made larger. Therefore, even if the diameter of the hole is increased in order to facilitate processing, it is easier to adjust the leakage amount to an appropriate amount by increasing the length of the hole.

Example 4
9 and 10 show Embodiment 4 of the present invention. In the present embodiment, a configuration in which chamfering is provided between the outer peripheral surface and both side wall surfaces in the seal ring according to the third embodiment will be described. Since other configurations and operations are the same as those of the first to third embodiments, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  9 is a side view of the seal ring 100 according to the fourth embodiment of the present invention, and FIG. 10 is a schematic cross-sectional view of the seal ring 100 according to the fourth embodiment of the present invention. 10 is a cross-sectional view taken along AA in FIG.

  Also in the seal ring 100 according to the present embodiment, as in the case of the third embodiment, the joint portion 110, the through hole 120c penetrating from the inner peripheral surface to the position near the outer peripheral surface of one side wall surface, and the inner peripheral surface A through-hole 120d that penetrates from the surface to the position near the outer peripheral surface of the other side wall surface is provided. These configurations are the same as the configuration of the seal ring 100 according to the third embodiment.

  And in the seal ring 100 which concerns on a present Example, the chamfer 130 is provided between the outer peripheral surface and both wall surfaces.

As described above, also in the seal ring 100 according to the present embodiment, the same effect as that of the third embodiment can be obtained. Further, according to the seal ring 100 according to the present embodiment, since the chamfer 130 is provided, even if sliding wear occurs in the seal ring 100, the through hole 120 is provided.
The influence of the opening on the side wall surface side in c and 120d can be suppressed. Thereby, the leakage amount of the fluid to be sealed can be further stabilized.

(Example 5)
11 and 12 show a fifth embodiment of the present invention. In the present embodiment, the seal ring according to the third embodiment shows a configuration in which a counterbore is provided in the vicinity of the opening on the side wall surface side in the through hole. Since other configurations and operations are the same as those of the first to third embodiments, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 11 is a side view of a seal ring 100 according to Embodiment 5 of the present invention, and FIG. 12 is a schematic cross-sectional view of the seal ring 100 according to Embodiment 5 of the present invention. 12 is a cross-sectional view taken along AA in FIG.

  Also in the seal ring 100 according to the present embodiment, as in the case of the third embodiment, the joint portion 110, the through hole 120c penetrating from the inner peripheral surface to the position near the outer peripheral surface of one side wall surface, and the inner peripheral surface A through-hole 120d that penetrates from the surface to the position near the outer peripheral surface of the other side wall surface is provided. These configurations are the same as the configuration of the seal ring 100 according to the third embodiment.

  In the seal ring 100 according to the present embodiment, counterbore 140 is provided in the vicinity of the opening on the side wall surface side of the through holes 120c and 120d.

  As described above, also in the seal ring 100 according to the present embodiment, the same effect as in the case of the third embodiment can be obtained. Further, according to the seal ring 100 according to the present embodiment, the counterbore 140 is provided. Therefore, even if sliding wear occurs in the seal ring 100, the influence of the opening on the side wall surface side in the through holes 120c and 120d. Can be suppressed. Thereby, the leakage amount of the fluid to be sealed can be further stabilized.

(Example 6)
13 and 14 show a sixth embodiment of the present invention. In this embodiment, in the seal ring according to the second embodiment, a configuration in which the hole diameter of the through hole gradually increases from the inner peripheral surface side toward the side wall surface side is shown. Since other configurations and operations are the same as those in the first and second embodiments, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 13 is a side view of a seal ring 100 according to Embodiment 6 of the present invention, and FIG. 14 is a schematic cross-sectional view of the seal ring 100 according to Embodiment 6 of the present invention. 14 is a cross-sectional view taken along AA in FIG.

  Also in the seal ring 100 according to the present embodiment, as in the case of the second embodiment, the joint portion 110, the through-hole 120e penetrating from the inner peripheral surface to the position near the outer peripheral surface of the one side wall surface, and the inner peripheral A through-hole 120f that penetrates from the surface to the position near the outer peripheral surface of the other side wall surface is provided.

  In the seal ring 100 according to the second embodiment, the through holes 120a and 120b have the same diameter from the inner peripheral surface side toward the side wall surface side, whereas the seal according to the present embodiment. In the ring 100, the diameters of the through holes 120e and 120f are configured to gradually increase from the inner peripheral surface side toward the side wall surface side. Other configurations are the same as the configuration of the seal ring 100 according to the second embodiment.

As described above, also in the seal ring 100 according to the present embodiment, the same effect as in the second embodiment can be obtained. In the case of the seal ring 100 according to the present embodiment, the leakage amount of the fluid to be sealed can be controlled by the hole diameter of the opening on the inner peripheral surface side in the through holes 120e and 120f. Therefore, even if sliding wear occurs in the seal ring 100 and the hole diameter of the opening on the side wall surface side of the through holes 120e and 120f changes, the leakage amount of the fluid to be sealed can be stabilized.

DESCRIPTION OF SYMBOLS 100 Seal ring 110 Joint part 111a 1st fitting convex part 111b 1st fitting recessed part 112a 2nd fitting convex part 112b 2nd fitting recessed part 120,120a, 120b, 120c, 120d, 120e, 120f Through-hole 130 Chamfering 140 Counterbore 200 shaft 210 annular groove 300 housing

Claims (1)

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 shaft and the housing that moves relatively,
In the resin seal ring that is in close contact with the side wall surface opposite to the sealing region side in the annular groove and the inner peripheral surface of the shaft hole through which the shaft in the housing is inserted,
Penetrating from the inner peripheral surface to the position exposed to the annular gap between the shaft and the housing on the side wall surface opposite to the sealed region side, and leaking the fluid to be sealed to the region opposite to the sealed region side A seal ring having holes.

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