JP2015203489A - seal ring and sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal ring which is excellent in attachment workability, and improved in sealing performance, and a sealing device.SOLUTION: In a seal ring 100 which is attached to an annular groove formed at one member out of two members, and seals an annular clearance between the two members, the annular seal ring 100 is constituted by the connection of both end parts of the plurality of members in a circumferential direction, a half of the plurality of members is a resin-made first member 110, the remaining half is an elastic body made second member 120, and the first member 110 and the second member 120 are alternately arranged in the circumferential direction, and connected to each other.

Description

  The present invention relates to a seal ring and a sealing device for sealing an annular gap between two members.

  Conventionally, a seal ring is known that is mounted in an annular groove formed in one of two members and seals an annular gap between the two members. In such a seal ring, a resin seal ring is widely used to reduce sliding torque.

  For example, in Automatic Transmission (AT) and Continuously Variable Transmission (CVT) for automobiles, in order to maintain the hydraulic pressure, a resin-made seal is used to seal the annular gap between the relatively rotating shaft and the housing. A seal ring is used. In recent years, low fuel consumption has been promoted as a countermeasure for environmental problems, and in the above-described seal ring, there is an increasing demand not only for reducing rotational torque but also for further reducing oil leakage.

  However, a resin seal ring is generally provided with an abutment portion cut at one place in the circumferential direction from the viewpoint of mounting workability. Thus, in the case of a seal ring having a joint part, there is a limit in suppressing oil leakage from the joint part.

  There is also an endless resin seal ring that does not include a joint portion. However, in the case of such a seal ring, there is a problem that mounting workability to an annular groove formed in the shaft or the housing is poor. Further, in such a seal ring, when used in an annular groove formed in the shaft and slid on the inner peripheral surface of the shaft hole provided in the housing, due to the creep phenomenon over time, There is also a problem that oil leakage increases at low temperatures. In other words, in a high temperature environment, the seal ring that is about to expand its diameter due to thermal expansion is constrained by the inner peripheral surface of the shaft hole, and the seal ring undergoes creep in the circumferential direction and permanent distortion occurs in the compression direction. End up. Thereby, when temperature falls, oil leakage will increase.

Japanese Patent No. 4788634

  An object of the present invention is to provide a seal ring and a sealing device that are excellent in mounting workability and have improved sealing performance.

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

That is, the seal ring of the present invention is
In a seal ring that is mounted in an annular groove formed in one of the two members and seals the annular gap between the two members,
An annular seal ring is configured by connecting both ends in the circumferential direction of the plurality of members,
Half of the plurality of members are resin first members, the other half are elastic second members, and the first members and the second members are alternately arranged in the circumferential direction, and Each is connected.

  According to the present invention, since half of the plurality of members is the second member made of an elastic body, the annular seal ring can be elastically expanded and contracted in the radial direction. Therefore, it is possible to improve the mounting workability when mounting the seal ring in the annular groove. Moreover, according to this invention, the cyclic | annular seal ring is comprised by connecting the both ends of the circumferential direction of a some member, respectively. For this reason, it is possible to reduce the leakage amount of the fluid to be sealed as compared with a seal ring in which a joint portion is provided at one place in the circumferential direction. Furthermore, according to the present invention, even if the first resin member expands and contracts due to a change in environmental temperature, the elastic second member expands and contracts in the circumferential direction. The load of is reduced. Thereby, it can control that permanent distortion by creep arises in the 1st member, and it can control that the amount of leakage of the sealing object fluid increases at low temperature.

  It is preferable that the first member and the second member are connected to each other by adhering the entire surfaces of both end surfaces in the circumferential direction of the first member and both end surfaces in the circumferential direction of the second member.

  Thereby, even when the seal ring expands and contracts due to thermal expansion and contraction during use of the seal ring, it is possible to suppress the formation of a gap between the first member and the second member.

  Further, both ends of the first member in the circumferential direction and both ends of the second member in the circumferential direction can be fitted by fitting the first member and the second member in a direction parallel to the central axis of the seal ring. A structure is also suitable.

  In addition, after employ | adopting a fitting structure, the binding force of a 1st member and a 2nd member is made to adhere | attach the both ends surface of the circumferential direction of a 1st member, and the both ends surface of the circumferential direction of a 2nd member, respectively. Can be increased.

  Moreover, the 1st member and the 2nd member can also be made to be connected by shape | molding a 2nd member by insert-molding a 1st member as insert parts.

  And it is good for the connection part of the 1st member and 2nd member after insert molding to have a part hooked with respect to the direction which separates the 1st member and the 2nd member in the peripheral direction.

  Thereby, the coupling | bonding force of a 1st member and a 2nd member can be raised.

Moreover, the sealing device of the present invention comprises:
Two seal rings as described above
It is preferable that these one seal ring and the other seal ring are overlapped in the central axis direction so that the second member in one seal ring and the second member in the other seal ring do not overlap.

  Thereby, it can suppress that fluid pressure is directly applied with respect to the seal ring arrange | positioned on the opposite side to the sealing object fluid side. Therefore, it can suppress that a big pressure is applied to the 2nd member in the said seal ring.

  The one seal ring is provided with a fitting convex portion, the other seal ring is provided with a fitting concave portion to be fitted to the fitting convex portion, and the fitting convex portion is formed in the fitting concave portion. In the fitted state, the one seal ring and the other seal ring are preferably overlapped in the central axis direction.

  Thereby, it can suppress that the position of one seal ring and the other seal ring shifts in the circumferential direction, and suppresses the second member in one seal ring and the second member in the other seal ring from overlapping. it can. Therefore, it can suppress more reliably that a big pressure will be applied to the 2nd member in the seal ring arrange | positioned on the opposite side to the sealing object fluid side.

  In addition, said each structure can be employ | adopted combining as much as possible.

  As described above, according to the present invention, the mounting workability can be improved and the sealing performance can be improved.

FIG. 1 is a plan view of a seal ring according to an embodiment of the present invention. FIG. 2 is a plan view of the first member according to the embodiment of the present invention. FIG. 3 is a plan view of the second member according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing a usage state of the seal ring according to the embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a usage state of the seal ring according to the embodiment of the present invention. FIG. 6 is an explanatory view illustrating how to assemble the sealing device according to the first embodiment of the present invention. FIG. 7 is a plan view of the sealing device according to Embodiment 1 of the present invention. FIG. 8 is a schematic cross-sectional view showing a usage state of the sealing device according to Embodiment 1 of the present invention. FIG. 9 is an explanatory view illustrating how to assemble the sealing device according to the second embodiment of the present invention. FIG. 10 is a plan view of a sealing device according to Embodiment 2 of the present invention. FIG. 11 is a part of a view from the outer peripheral surface side of the sealing device according to the second embodiment of the present invention.

  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. .

(Example of seal ring)
With reference to FIGS. 1-5, the seal ring which concerns on the Example of this invention is demonstrated. In the following description, “the direction of the central axis” means the direction of the central axis in the annular seal ring.

<Configuration of seal ring>
In particular, the configuration of the seal ring according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a seal ring according to an embodiment of the present invention. FIG. 2 is a plan view of the first member according to the embodiment of the present invention. FIG. 3 is a plan view of the second member according to the embodiment of the present invention.

The planar shape of the seal ring 100 according to the embodiment of the present invention is an annular shape. And about this seal ring 100, the external shape of the cut surface containing the center axis line is a rectangular shape with the same vertical and horizontal dimensions regardless of the cutting position. In this embodiment, the annular seal ring 100 is configured by connecting the circumferential ends of the plurality of members. More specifically, half of the plurality of members are the first members 110 made of resin, and the other half are the second members 120 made of an elastic body. Examples of materials used for the first member 110 include PTFE (polytetrafluoroethylene) and PEEK (polyetheretherketone). An example of a material used for the second member 120 is rubber.

  The first member 110 and the second member 120 are alternately arranged in the circumferential direction and connected to each other. In the present embodiment, four first members 110 and four second members 120 are provided. However, in the present invention, the number of first members and second members is not limited.

  The first member 110 includes a first member body 111 having a circular arc shape in plan view. And the recessed part 112 is formed in the both ends of this 1st member main-body part 111, respectively. The concave portion 112 includes a linear portion 112a extending linearly and an arc-shaped portion 112b provided at the tip of the linear portion 112a. The second member 120 includes a second member main body 121 having a circular arc shape in plan view. And the convex part 122 is formed in the both ends of this 2nd member main-body part 121, respectively. The convex part 122 is comprised from the linear part 122a extended linearly, and the circular arc-shaped part 122b provided in the front-end | tip of the linear part 122a.

  The shape and size of the side wall surface of the linear portion 112a in the concave portion 112 and the shape and size of the side wall surface of the linear portion 122a in the convex portion 122 are configured to be the same. Further, the shape and size of the side wall surface of the arc-shaped portion 112b in the concave portion 112 and the shape and size of the side wall surface of the arc-shaped portion 122b in the convex portion 122 are configured to be the same. Further, the outer shape of the cut surface perpendicular to the central axis of the seal ring 100 in the first member 110 is configured to have the same shape and size regardless of the cutting position. Similarly for the second member 120, the outer shape of the cut surface perpendicular to the central axis of the seal ring 100 in the second member 120 is configured to have the same shape and size regardless of the cutting position. .

  With the configuration as described above, in a state where the first member 110 and the second member 120 are connected, there is a gap between the side wall surface of the concave portion 112 in the first member 110 and the side wall surface of the convex portion 122 in the second member 120. There is no gap. Therefore, the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120 are in close contact with each other, and no gap is formed between them. Therefore, the outer shape of the cut surface including the central axis of the seal ring 100 is a rectangular shape having the same vertical and horizontal dimensions regardless of the cutting position.

<Connection method (connection structure)>
The connection method (connection structure) of the 1st member 110 and the 2nd member 120 is demonstrated. Various known techniques can be adopted as a connection method (connection structure) between the circumferential end of the first member 110 and the circumferential end of the second member 120. However, when the seal ring 100 is used, it is desirable that no gap is formed between the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120. Hereinafter, when the seal ring 100 is used, a circumferential end portion of the first member 110 is formed so that a gap is not formed between the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120. A specific example of a method (structure) capable of connecting the end of the second member 120 in the circumferential direction will be described.

<< Connection method (connection structure) 1 >>
First, the first member 110 shown in FIG. 2 and the second member 120 shown in FIG. 3 are respectively molded by molding. Since the molding method using a mold is known, the description thereof is omitted. Then, an adhesive is applied to the entire surface of the first member 110 in the circumferential direction (including the side wall surface of the recess 112). In addition, you may apply | coat an adhesive agent to the whole surface of the circumferential surface of the 2nd member 120 (a side wall surface of the convex part 122 is included). Thereafter, the concave portion 112 of the first member 110 and the convex portion 122 of the second member 120 are fitted. Thereby, the end surface of the circumferential direction of the 1st member 110 and the end surface of the circumferential direction of the 2nd member 120 are adhere | attached with an adhesive agent, and the 1st member 110 and the 2nd member 120 are connected. With such a connection direction (connection structure), even when the seal ring 100 is used, no gap is formed between the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120. The concave portion 112 in the first member 110 and the convex portion 122 in the second member 120 can be fitted by fitting the first member 110 and the second member 120 in a direction parallel to the central axis of the seal ring 100. is there.

<< Connection method (connection structure) 2 >>
First, the first member 110 shown in FIG. 2 is formed by molding. Then, the second member 120 is formed by insert molding using the first member 110 as an insert part. Since the molding method (insert molding method) using a mold is known, the description thereof is omitted. In the case of the seal ring 100 shown in FIG. 1, the four second members 120 are formed by insert molding using the four first members 110 as insert parts. As a result, the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120 are bonded together by vulcanization molding, and the first member 110 and the second member 120 are connected. With such a connection direction (connection structure), even when the seal ring 100 is used, no gap is formed between the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120. Furthermore, in this embodiment, the arc-shaped portion 122b of the convex portion 122 enters the arc-shaped portion 112b having a diameter larger than the width of the linear portion 112a of the concave portion 112. Thereby, the connection part of the 1st member 110 and the 2nd member 120 after insert molding has a part hooked with respect to the direction which separates the 1st member 110 and the 2nd member 120 in the peripheral direction.

<Usage example>
In particular, a usage example of the seal ring 100 according to the present embodiment will be described with reference to FIGS. 4 and 5. 4 and 5 are schematic cross-sectional views showing a use state of the seal ring 100 according to the embodiment of the present invention. The seal ring 100 in FIGS. 4 and 5 is an XX cross-sectional view in FIG. The seal ring 100 according to the present embodiment is mounted in an annular groove formed in one of the two members, and exhibits a function of sealing an annular gap between the two members. Even when the two members move relatively, the seal ring 100 according to the present embodiment can be suitably used. Here, as an example of the case where the two members move relatively, a case where the two members rotate relatively, a case where the two members relatively move back and forth, and a case where these operations are performed in combination are given. be able to.

<< Use Example 1 >>
FIG. 4 shows a usage example 1 of the seal ring according to the present embodiment. In this use example, the seal ring 100 is mounted in an annular groove 510 provided on the outer periphery of the shaft 500. The seal ring 100 receives the fluid pressure of the fluid to be sealed, such as oil, from the high pressure side (H), whereby the side wall surface on the low pressure side (L) of the annular groove 510 and the shaft hole provided in the housing 600. It will be in the state closely_contact | adhered to the inner peripheral surface. Thereby, the annular gap between the shaft 500 and the housing 600 (the shaft hole thereof) is sealed by the seal ring 100. FIG. 4 shows the case where the right side is the high pressure side (H) and the left side is the low pressure side (L). However, depending on the use conditions, the high pressure side (H) and the low pressure side (L) may be alternately switched. is there. The seal ring 100 according to the present embodiment can be used under such usage conditions.

  Here, when the shaft 500 and the housing 600 rotate relatively, the shaft provided between the seal ring 100 and the side wall surface of the annular groove 510 on the low pressure side (L), and the shaft provided on the seal ring 100 and the housing 600. At least one of the inner peripheral surfaces of the holes slides. Further, when the shaft 500 and the housing 600 reciprocate relatively, the seal ring 100 and the inner peripheral surface of the shaft hole provided in the housing 600 slide.

<< Usage example 2 >>
FIG. 5 shows a usage example 2 of the seal ring according to the present embodiment. In this usage example, the seal ring 100 is mounted in an annular groove 610 provided on the inner periphery of the shaft hole of the housing 600. The seal ring 100 is in close contact with the side wall surface on the low pressure side (L) of the annular groove 610 and the outer peripheral surface of the shaft 500 by receiving the fluid pressure of the fluid to be sealed such as oil from the high pressure side (H). It becomes. Thereby, the annular gap between the shaft 500 and the housing 600 (the shaft hole thereof) is sealed by the seal ring 100. FIG. 5 shows the case where the right side is the high pressure side (H) and the left side is the low pressure side (L). However, depending on the use conditions, the high pressure side (H) and the low pressure side (L) may be alternately switched. is there. The seal ring 100 according to the present embodiment can be used under such usage conditions.

  Here, when the shaft 500 and the housing 600 rotate relatively, between the seal ring 100 and the low-pressure side (L) side wall surface of the annular groove 610, and between the seal ring 100 and the outer peripheral surface of the shaft 500. At least one of them slides. Further, when the shaft 500 and the housing 600 relatively reciprocate, the seal ring 100 and the outer peripheral surface of the shaft 500 slide.

<Excellent points of seal ring according to this embodiment>
In the seal ring 100 according to the present embodiment, the annular seal ring 100 is configured by connecting both ends in the circumferential direction of a plurality of members. Further, half of the plurality of members is the first member 110 made of resin, and the other half is the second member 120 made of an elastic body. The seal ring 100 according to the present embodiment is configured such that the first members 110 and the second members 120 are alternately arranged in the circumferential direction and are connected to each other. Thus, according to the seal ring 100 according to the present embodiment, since half of the plurality of members constituting the seal ring 100 is the second member 120 made of an elastic body, the annular seal ring 100 is arranged in the radial direction. It is possible to stretch and contract elastically. Therefore, it is possible to improve the mounting workability when the seal ring 100 is mounted in the annular groove (the annular groove 510 provided in the shaft 500 or the annular groove 610 provided in the housing 600).

  Further, according to the seal ring 100 according to the present embodiment, the annular seal ring 100 is configured by connecting both ends in the circumferential direction of a plurality of members. For this reason, it is possible to reduce the leakage amount of the fluid to be sealed as compared with a seal ring in which a joint portion is provided at one place in the circumferential direction.

Furthermore, according to the seal ring 100 according to the present embodiment, even if the first resin member 110 is thermally expanded and contracted as the environmental temperature changes, the elastic second member 120 expands and contracts in the circumferential direction. Therefore, the stress load on the first member 110 is reduced. Thereby, it can suppress that the permanent distortion by creep arises in the 1st member 110, and it can suppress that the leakage amount of the sealing object fluid increases at low temperature. In general, when an endless seal ring is used in the first usage example, a margin for tightening the inner peripheral surface of the shaft hole of the housing is set in the seal ring. This tightening allowance decreases with time due to a creep phenomenon that occurs with thermal expansion at a high temperature. As a result, when the temperature is low, there is no tightening allowance, or a gap is formed between the seal ring and the shaft hole, and leakage occurs. In contrast, in the seal ring 100 according to the present embodiment, as described above, the stress load on the first member 100 is reduced by the expansion and contraction of the second member 120 in the circumferential direction, and the occurrence of creep is suppressed. be able to. Therefore, it is possible to suppress a decrease in tightening allowance over time and to suppress leakage at a low temperature. Moreover, generally, when a seal ring is used in the above-mentioned usage example 2, a tightening margin is set for the outer peripheral surface of the shaft. Here, it is desirable to set the tightening margin as large as possible in order to prevent the seal ring from separating from the outer peripheral surface of the shaft even if the circumferential length of the seal ring extends due to thermal expansion. However, it is unavoidable to reduce the tightening allowance over time due to the occurrence of the creep phenomenon. On the other hand, in the seal ring 100 according to the present embodiment, since the second member 120 made of an elastic body can be contracted in the circumferential direction, the tightening allowance is larger than that in the case of a resin endless seal ring. Can be set larger. Accordingly, as described above, it is possible to suppress a decrease in the sealing performance of the seal ring 100 due to the creep phenomenon in combination with the reduction of the stress load on the first member 110.

  In the seal ring 100 according to the present embodiment, the first member 110 and the second member are bonded to each other by bonding the entire circumferential surfaces of the first member 110 and the circumferential surfaces of the second member 120 together. A configuration in which 120 is connected can be adopted. Thereby, when the seal ring 100 is used, even if the seal ring 100 expands and contracts due to thermal expansion and contraction or the like, the formation of a gap between the first member 110 and the second member 120 is suppressed. it can.

  Further, in the seal ring 100 according to the present embodiment, when the first member 110 and the second member 120 are respectively formed, both ends in the circumferential direction of the first member 110 and both ends in the circumferential direction of the second member 120 are The first member 110 and the second member 120 are fitted together by fitting them in a direction parallel to the central axis of the seal ring 100. That is, the concave portion 112 in the first member 110 and the convex portion 122 in the second member 120 are configured to be fitted together by fitting in the above direction. And in the seal ring 100 which concerns on a present Example, after employ | adopting such a fitting structure, the both end surfaces of the circumferential direction of the 1st member 110 and the both end surfaces of the circumferential direction of the 2nd member 120 are each adhere | attached. I am doing so. As a result, the coupling force between the first member 110 and the second member 120 can be increased.

  In the seal ring 100 according to the present embodiment, the first member 110 and the second member 120 are connected by forming the second member 120 by insert molding using the first member 110 as an insert part. Can also be adopted. As a result, the circumferential end surface of the first member 110 and the circumferential end surface of the second member 120 are bonded together by vulcanization molding, and the first member 110 and the second member 120 are connected. Therefore, when the seal ring 100 is used, even if the seal ring 100 expands and contracts due to thermal expansion and contraction or the like, the formation of a gap between the first member 110 and the second member 120 can be suppressed. .

  Further, when the second member 120 is formed by insert molding, in the case of the seal ring 100 according to the present embodiment, the first member 110 and the second member 120 after the insert molding have a first portion at the connection portion. It has a part which hooks with respect to the direction which separates the member 110 and the 2nd member 120 in the circumferential direction. As a result, the coupling force between the first member 110 and the second member 120 can be increased.

(Other)
The seal ring 100 according to the present embodiment employs a configuration in which the concave portions 112 are provided at both ends of the first member 110 and the convex portions 122 are provided at both ends of the second member 120, respectively. However, a configuration in which the concave portion 112 and the convex portion 122 are not provided, that is, a configuration in which both ends in the circumferential direction of the first member main body 111 are respectively flat and both ends in the circumferential direction of the second member main body 121 are respectively flat is employed. You can also However, when such a configuration is adopted, in both cases of bonding with an adhesive and insert molding,
The coupling force between the first member 110 and the second member 120 will be low. Therefore, in order to increase the coupling force, it is desirable to provide the concave portion 112 and the convex portion 122 like the seal ring 100 according to the present embodiment.

  However, in the present embodiment, the case where the concave portion 112 is provided in the first member 110 and the convex portion 122 is provided in the second member is shown, but the convex portion is provided in the first member 110 and the concave portion is provided in the second member 120. The structure which provides can also be employ | adopted.

  In the present embodiment, the concave portion 112 is composed of a linear portion 112a and an arc-shaped portion 112b, and the convex portion 122 is composed of a linear portion 122a and an arc-shaped portion 122b. However, as long as the first member 110 and the second member 120 are connected, the shapes of the concave portion and the convex portion are not limited to the configurations shown in the above embodiments. However, it is desirable that the shape of the concave portion and the convex portion is such that the first member 110 and the second member 120 are caught in the circumferential direction. By doing so, the coupling force between the first member 110 and the second member 120 can be increased.

(Application examples of seal rings)
When the seal ring 100 described above is used alone when used under high pressure conditions, the elastic second member 120 may be damaged by directly receiving a large fluid pressure. That is, the second member 120 made of an elastic body can be deformed so as to protrude toward the low pressure side when receiving a large fluid pressure. As a result, a part of the second member 120 may protrude from the annular groove 510 provided on the outer periphery of the shaft 500 or the annular groove 610 provided on the inner periphery of the shaft hole of the housing 600. That is, a part of the deformation may protrude into a minute gap (portion indicated by an arrow S in FIGS. 4 and 5) between the outer peripheral surface of the shaft 500 and the inner peripheral surface of the shaft hole of the housing 600. Thereby, there exists a possibility that the part which protruded into the minute clearance S may be damaged. Therefore, an application example for solving such a problem while using the seal ring 100 will be described.

(Example 1 of sealing device)
6 to 8 show a first embodiment of the sealing device of the present invention. The sealing device according to the present embodiment is an application example using the seal ring 100 described above, and the configuration of the seal ring 100 itself is the same as the configuration of the seal ring 100 according to the above embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is an explanatory view illustrating how to assemble the sealing device according to the first embodiment of the present invention. FIG. 7 is a plan view of the sealing device according to Embodiment 1 of the present invention. FIG. 8 is a schematic cross-sectional view showing a usage state of the sealing device according to Embodiment 1 of the present invention. In addition, the sealing device in FIG. 8 is a YY sectional view in FIG.

  The sealing device 200 according to this embodiment includes two seal rings 100. Hereinafter, for convenience of explanation, these two seal rings are referred to as “one seal ring 100A” and “the other seal ring 100B”, respectively. The sealing device 200 according to the present embodiment is configured so that the second member 120 in one seal ring 100A and the second member 120 in the other seal ring 100B do not overlap with each other. It is configured by overlapping 100B in the central axis direction. More specifically, the other seal ring 100B is overlapped with the one seal ring 100A in the central axis direction so that the first member 110 and the second member 120 are shifted from each other by 45 ° (see FIG. 6). Accordingly, the one seal ring 100A and the other seal ring 100B are overlapped in the direction of the central axis so that the second member 120 in one seal ring 100A and the second member 120 in the other seal ring 100B do not overlap.

  FIG. 8 shows a case where the sealing device 200 according to the present embodiment is mounted in an annular groove 510 provided on the outer periphery of the shaft 500. The sealing device 200 receives the fluid pressure of the fluid to be sealed such as oil from the high pressure side (H), and thereby the side wall surface on the low pressure side (L) in the annular groove 510 and the shaft hole provided in the housing 600. It will be in the state closely_contact | adhered to the inner peripheral surface. As a result, the annular gap between the shaft 500 and the housing 600 (the shaft hole) is sealed by the sealing device 200. FIG. 8 shows the case where the right side is the high pressure side (H) and the left side is the low pressure side (L). However, depending on the use conditions, the high pressure side (H) and the low pressure side (L) may be alternately switched. is there. The sealing device 200 according to the present embodiment can be used under such usage conditions.

  The sealing device 200 according to the present embodiment can also be used so as to be mounted in an annular groove provided on the inner periphery of the shaft hole of the housing 600, as shown in the usage example 2 of the seal ring 100. . In this case, the sealing device 200 receives the fluid pressure of the fluid to be sealed, such as oil, from the high pressure side (H), thereby closely contacting the low pressure side (L) side wall surface of the annular groove and the outer peripheral surface of the shaft 500. It will be in the state.

  According to the sealing device 200 configured as described above, a seal ring (here, one seal ring) disposed on the side (low pressure side (L)) opposite to the fluid to be sealed (high pressure side (H)). 100A), it is possible to prevent the fluid pressure from being applied directly. Thereby, it can suppress that a big pressure is applied to the 2nd member 120 in this one seal ring 100A. Therefore, it can suppress that the 2nd member 120 in this one seal ring 100A deform | transforms so that it may protrude toward the low voltage | pressure side (L), and can suppress that the 2nd member 120 will be damaged.

(Example 2 of sealing device)
9 to 11 show a second embodiment of the sealing device of the present invention. The sealing device according to the present embodiment is an application example using the seal ring 100 described above, and the basic configuration of the seal ring 100 itself is the same as the configuration of the seal ring 100 according to the above embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 9 is an explanatory view illustrating how to assemble the sealing device according to the second embodiment of the present invention. FIG. 10 is a plan view of a sealing device according to Embodiment 2 of the present invention. FIG. 11 is a part of a view from the outer peripheral surface side of the sealing device according to the second embodiment of the present invention. In addition, FIG. 11 is the figure seen in the P direction in FIG.

  The sealing device 300 according to this embodiment includes two seal rings 100. Hereinafter, for convenience of explanation, these two seal rings are referred to as “one seal ring 100C” and “the other seal ring 100D”, respectively. The sealing device 300 according to the present embodiment is configured so that the second member 120 in one seal ring 100C and the second member 120 in the other seal ring 100D do not overlap with each other. It is configured by overlapping 100D in the central axis direction. More specifically, the other seal ring 100D is overlapped with the one seal ring 100C in the central axis direction so that the first member 110 and the second member 120 are shifted from each other by 45 ° (see FIG. 9). Accordingly, the one seal ring 100C and the other seal ring 100D are overlapped in the central axis direction so that the second member 120 in the one seal ring 100C and the second member 120 in the other seal ring 100D do not overlap.

Here, in the case of the sealing device 300 according to the present embodiment, the fitting convex portion 115 is provided on one seal ring 100C, and the fitting convex portion 115 is fitted on the other seal ring 100D. A concavity 116 is provided. More specifically, the fitting convex portion 115 is provided in one first member 110a in one seal ring 100C, and the fitting concave portion 116 is provided in one first member 110b in the other seal ring 100D. . Then, in a state where the fitting convex portion 115 is fitted into the fitting concave portion 116, one seal ring 100C and the other seal ring 100D are overlapped in the central axis direction. In the present embodiment, the fitting convex portion 115 is constituted by a convex portion extending from the inner peripheral surface to the outer peripheral surface in one seal ring 100C. Moreover, the fitting recessed part 116 is comprised by the recessed part (groove part) from the inner peripheral surface in the other seal ring 100D to an outer peripheral surface. However, in the present invention, the shape of the fitting convex portion and the fitting concave portion is not limited as long as both are configured to be fitted. Moreover, although the case where the fitting convex part 115 and the fitting recessed part 116 were provided one each was shown in a present Example, in this invention, the number of these fitting convex parts and a fitting recessed part is not limited.

  As described above, the fitting convex portion 115 is provided in one seal ring 100C, and the fitting concave portion 116 to be fitted to the fitting convex portion 115 is provided in the other seal ring 100D. This is different from the sealing device 200 according to the first embodiment. Other configurations are the same as those of the sealing device 200 according to the first embodiment.

  Also in the sealing device 300 configured as described above, the same effect as that of the sealing device 200 according to the first embodiment can be obtained. In the case of the sealing device 300 according to the present embodiment, the fitting convex portion 115 is provided on one seal ring 100C, and the fitting convex portion 115 is fitted on the other seal ring 100D. A recess 116 is provided. Therefore, it can suppress that the position of one seal ring 100C and the other seal ring 100D shifts in the circumferential direction. Thereby, it can suppress that the 2nd member 120 in one seal ring 100C and the 2nd member 120 in the other seal ring 100D overlap. Therefore, it can suppress more reliably that the big pressure will be applied to the 2nd member 120 in the seal ring arrange | positioned on the opposite side to the sealing object fluid side.

100, 100A, 100B, 100C, 100D Seal ring 110, 110a, 110b 1st member 111 1st member main-body part 112 Recessed part 112a Linear part 112b Arc-shaped part 115 Fitting convex part 116 Fitting recessed part 120 2nd member 121 1st 2 member main body part 122 convex part 122a linear part 122b arcuate part 200,300 sealing device 500 shaft 510 annular groove 600 housing 610 annular groove

Claims (7)

In a seal ring that is mounted in an annular groove formed in one of the two members and seals the annular gap between the two members,
An annular seal ring is constructed by connecting both ends in the circumferential direction of the plurality of members,
Half of the plurality of members are resin first members, the other half are elastic second members, and the first members and the second members are alternately arranged in the circumferential direction, and A seal ring characterized by being connected to each other.   The first member and the second member are connected to each other by adhering the entire surfaces of both end surfaces in the circumferential direction of the first member and both end surfaces in the circumferential direction of the second member, respectively. The seal ring described.   A fitting structure in which both ends in the circumferential direction of the first member and both ends in the circumferential direction of the second member can be fitted by fitting the first member and the second member in a direction parallel to the central axis of the seal ring. The seal ring according to claim 1, wherein the seal ring is formed.   The seal ring according to claim 1, wherein the first member and the second member are connected by forming the second member by insert molding using the first member as an insert part.   5. The connecting portion between the first member and the second member after the insert molding has a portion that is hooked with respect to a direction in which the first member and the second member are separated in the circumferential direction. The seal ring as described in. Two seal rings according to any one of claims 1 to 5 are provided,
The one seal ring and the other seal ring are overlapped in the central axis direction so that the second member in one seal ring and the second member in the other seal ring do not overlap. Sealing device.   The one seal ring is provided with a fitting convex portion, the other seal ring is provided with a fitting concave portion to be fitted to the fitting convex portion, and the fitting convex portion is formed in the fitting concave portion. The sealing device according to claim 6, wherein the one seal ring and the other seal ring are overlapped in a central axis direction in a fitted state.

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