JP2009085415A - Seal ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal ring improved in installability and restricted to be broken in installation without requiring a tendency-imparting process. <P>SOLUTION: This seal ring 1 is structured of a seal ring main body 2 cut in one part in the circumferential direction and a connecting member 3 provided in the cut part so as to be connected to both ends of the seal ring main body 2. A connection part between the seal ring main body 2 and the connecting member 3 is formed with a first sliding seal surface 7 vertical to a shaft and slidable in the circumferential direction and a second sliding seal surface 8 concentric with the shaft and slidable in the circumferential direction, and fitted by concave-protrusion engagement forming a gap, which can absorb a change of the circumferential length of the seal ring main body 2 or the connecting member 3, between opposite surfaces of both the ends of the seal ring main body 2 and the connecting member 3 in the circumferential direction. The seal ring main body 2 and the connecting member 3 are formed with a first seal surface 11 for abutting on the other member and a second seal surface 12 for abutting on a side surface of an annular groove on a non-sealed fluid side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seal ring for sealing an annular gap between two members provided to be rotatable relative to each other.

  Conventionally, this type of seal ring is used in, for example, a hydraulic apparatus such as an automatic transmission of an automobile.

  Hereinafter, a seal ring according to the related art will be described with reference to FIGS. FIG. 10 is a schematic front view of a seal ring according to the prior art. FIG. 11 is a schematic cross-sectional view showing a state in which a seal ring according to the prior art is mounted. FIG. 12 is a schematic partially enlarged perspective view showing a state before the cut portion of the seal ring according to the related art is fitted. FIG. 13 is a schematic partially enlarged perspective view showing a state in which a cut portion of a seal ring according to the prior art is fitted. FIG. 14 is a schematic front view of the seal ring according to the prior art before brazing. FIG. 15 is a schematic front view after brazing of a seal ring according to the prior art. FIG. 16 is a schematic front view showing a state in which the cut portion of the seal ring according to the related art is caught. FIG. 17 is a schematic partially enlarged cross-sectional view showing a case where the seal ring according to the related art is mounted in a state where the cut portion is hooked. FIG. 18 is a schematic plan view showing a damaged state of the seal ring according to the prior art.

  The illustrated seal ring 100 is for sealing an annular gap between a housing 200 provided with a shaft hole and a shaft 300 inserted into the shaft hole. An annular groove 301 provided in the shaft 300 is illustrated. It is used by being attached to.

  The seal ring 100 is formed of a resin material, and includes a first seal surface 101 for sealing a side wall surface of the annular groove 301 provided in the shaft 300 and an inner peripheral surface of the shaft hole provided in the housing 200. And a second sealing surface 102 for sealing.

  Then, when pressure is applied in the direction of arrow P in FIG. 11 from the sealed fluid side O toward the non-sealed fluid side A, the seal ring 100 is pressed against the non-sealed fluid side A, so the first seal surface 101 is annular. The side wall surface of the groove 301 is pressed, and the second seal surface 102 presses the inner peripheral surface of the shaft hole provided in the housing 200 facing the annular groove 301 and seals it at each position. In this way, leakage of the sealed fluid to the non-sealed fluid side A is prevented.

  Further, the ring body of the seal ring 100 is provided with a cut portion S at one place in the circumferential direction for the purpose of improving assemblability. The seal ring 100 is attached to the annular groove 301 of the shaft 300 by expanding the cut portion S.

  Various types of cut parts are known, but as shown in FIG. 12, a special step cut that is cut in two steps as it can be suitably handled by changes in ambient temperature. It has been known.

  According to this special step cut, the surfaces perpendicular to the circumferential direction have a gap 109 with respect to the circumferential direction, and the sealed fluid side and the non-sealed fluid side are blocked. Even if it expands due to the above, the amount of change in dimension can be absorbed by the gap 109 while maintaining the sealed state, so that the sealing performance can be maintained against changes in ambient temperature.

  However, in the case of the prior art as described above, the following problems may occur.

  Since the seal ring 100 described above is manufactured by injection molding including the cut portion S, the seal ring 100 is molded with an inner diameter D2 larger than the inner diameter D1 at the time of mounting. Therefore, it is necessary to braze the molded seal ring 100 so that the inner diameter thereof becomes the inner diameter D1 at the time of mounting.

  Further, since the cut portion S is not formed by cutting an annular seal ring and then cutting or the like, the cut portion S is caught when the seal ring 100 is mounted depending on the finish. This may result in poor mounting (FIG. 16). Then, if the cut portion S is inserted into the housing 200 in a hooked state, as shown in FIG. 17, the seal ring 100 and the housing 200 interfere with each other (B in FIG. 17), and in the worst case, there is a possibility that it cannot be assembled. There is.

  Further, when the seal ring 100 is attached, the cut portion S is attached to the annular groove 301 in an expanded state, so that a force due to deformation is likely to be applied to a portion farthest from the cut portion S. Therefore, if this force is applied too much, the seal ring 100 may be damaged (C in FIG. 18).

  The present invention has been made to solve the above-described problems of the prior art, and the purpose of the present invention is to provide a seal ring that is improved in mounting properties, is prevented from being damaged during mounting, and does not require a brazing process. There is to do.

  In order to achieve the above object, a seal ring according to the present invention is mounted in an annular groove provided in one member of a housing having a shaft hole and a shaft inserted into the shaft hole. In the seal ring that seals the annular gap, the seal ring is constituted by a seal ring main body cut at one place in the circumferential direction and a connecting member provided at the cut portion and connected to both ends of the seal ring main body. The connecting portion between the seal ring body and the connecting member has a first sliding seal surface perpendicular to the shaft and slidable in the circumferential direction, and a second sliding seal surface concentric with the shaft and slidable in the circumferential direction. Concavities and convexities that form a gap that can absorb changes in the circumferential length of the seal ring body or the connection member between the opposite ends of the seal ring body and the connection member in the circumferential direction while forming a sliding seal surface For mating The seal ring main body and the connecting member form a first seal surface that contacts the other member and a second seal surface that contacts the side surface of the annular groove on the non-sealing fluid side. It is characterized by doing.

  As described above, since the cutting portion of the seal ring body has a certain distance in advance to connect the connecting member, the connecting member is provided in such an amount that the gap between the ends of the seal ring body is widened when mounting. It can be reduced by a certain amount. Therefore, since the deformation amount of the seal ring body at the time of mounting can be reduced, the force applied to the seal ring body at the time of mounting can be reduced. Moreover, since it is not necessary to fit the edge parts of a seal ring main body, the conventional brazing process becomes unnecessary. Here, the cutting portion is not only formed by cutting the seal ring body that is originally connected in an annular shape at one place in the circumferential direction, but also a seal ring body having a shape lacking a part of the circumference from the beginning. What is formed by manufacturing is also included.

An edge on the other member side of the first sliding seal surface is in contact with the other member, and an edge on the non-sealing fluid side of the second sliding seal surface is an unsealed portion of the annular groove. The first sealing surface is in contact with the fluid side surface, and the peripheral surface on the other member side of the seal ring body and the peripheral surface on the other member side of the connecting member are the first sliding seal. The second seal surface includes a side surface on the non-sealing fluid side of the seal ring body and a side surface on the non-sealing fluid side of the connection member. It is also preferable that the second sliding seal surface is formed by being continuously connected through an edge.

  As described above, the seal ring according to the present invention reduces the amount of expansion between the end portions at the time of mounting, thereby improving the mounting performance and reducing the amount of deformation at the time of mounting. be able to. Moreover, since a brazing process is not required, manufacturing efficiency is improved. Furthermore, since there is no brazing step, the seal ring can be manufactured with a stable curvature. Therefore, stabilization of the sealing performance can be achieved.

  The best mode for carrying out the present invention will be exemplarily described in detail below 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. Absent.

(Embodiment 1)
With reference to FIGS. 1-6, the seal ring which concerns on 1st Embodiment is demonstrated.

  FIG. 1 is a schematic front view of a seal ring according to a first embodiment of the present invention. FIG. 2 is a schematic partially enlarged cross-sectional view showing a state in which the seal ring according to the first embodiment of the present invention is mounted. FIG. 3 is a schematic partially enlarged perspective view showing a state before the connection member is connected to the seal ring body in the seal ring according to the first embodiment of the present invention. FIG. 4 is a schematic partially enlarged perspective view showing a state in which the seal ring body and the connecting member are connected in the seal ring according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view of the seal ring according to the first embodiment of the present invention taken along the line AA in FIG. FIG. 6 is a schematic partially enlarged plan view and a schematic partially enlarged front view of the seal ring according to the first embodiment of the present invention.

  The seal ring 1 according to the present embodiment has an annular shape made of a resin material (for example, PEEK (polyether ether ketone), PPS (polyphenylene sulfide), etc.), and is cut at one place in the circumferential direction. The seal ring body 2 and the connection members 3 connected to both ends of the seal ring body 2 are configured.

  The seal ring 1 is mounted in, for example, an annular groove 5 provided in the shaft 4, and an annular gap is formed between the inner peripheral surface of the shaft hole of the housing 6 and the outer peripheral surface of the shaft 4 inserted into the shaft hole. Seal.

  The seal ring 1 includes a first seal surface 11 for sealing an inner peripheral surface of a shaft hole provided in the housing 6 and a second seal surface for sealing a side wall surface of the annular groove 5 provided in the shaft 4. 12.

  When pressure is applied in the direction of arrow P in FIG. 2 from the sealing fluid side O toward the non-sealing fluid side A, the seal ring 1 is pressed against the non-sealing fluid side A, so that the first sealing surface 11 has an annular groove 5. The inner peripheral surface of the shaft hole provided in the housing 6 facing the upper surface is pressed, and the second seal surface 12 presses the side wall surface of the annular groove 5 and seals it at each position. In this way, leakage of the sealed fluid to the non-sealed fluid side A is prevented.

The seal ring main body 2 has a shape cut at one place in the circumferential direction, and the annular seal ring 1 is formed by connecting the connecting member 3 between both ends thereof. The seal ring main body 2 and the connecting member 3 are connected by fitting of uneven portions provided at the respective end portions.

  A protruding portion 30 protruding in the circumferential direction is provided at the end of the connecting member 3. One convex portion 30 is provided at each of the sealing fluid side and the non-sealing fluid side at both ends of the connecting member 3 at a total of four locations.

  The end portion of the seal ring body 2 is provided with a concave portion 20 into which the convex portion 30 of the connecting member 3 is fitted. The recesses 20 are also provided in a total of four locations corresponding to the protrusions 30 on the sealed fluid side and the non-sealed fluid side of both ends of the seal ring body 2.

  The convex portion 30 has a first sliding contact surface 31 perpendicular to the shaft 4 and a second sliding contact surface 32 extending concentrically with the shaft 4. The recess 20 has a first sliding contact surface 21 perpendicular to the shaft 4 and a second sliding contact surface 22 extending concentrically with the shaft 4.

  The first slidable contact surface 21 and the first slidable contact surface 31 are slidably contacted with each other in the circumferential direction to form the first slidable seal surface 7. The edge of the first sliding seal surface 7 is in contact with the inner peripheral surface of the shaft hole of the housing 6.

  The second slidable contact surface 22 and the second slidable contact surface 32 are slidably contacted with each other in the circumferential direction to form the second slidable seal surface 8. The edge of the second sliding seal surface 8 is in contact with the non-sealed fluid side wall surface of the annular groove 5.

  The concave portion 20 and the convex portion 30 each have an end surface 23a and an end surface 33a perpendicular to the circumferential direction. The end surface 23 a and the end surface 33 a are surfaces facing each other at a predetermined interval in the circumferential direction, and form a gap 91.

  Each end portion of the seal ring body 2 has an end surface 23b perpendicular to the circumferential direction between the recessed portion 20 on the sealed fluid side and the recessed portion 20 on the non-sealed fluid side. Has an end face 33b perpendicular to the circumferential direction between the convex part 30 on the sealed fluid side and the convex part 30 on the non-sealed fluid side. The end surface 23b and the end surface 33b are surfaces facing each other at a predetermined interval in the circumferential direction, and form a gap 92.

  The outer peripheral surface 24 of the seal ring body 2 and the outer peripheral surface 34 of the connecting member 3 are continuously coupled via the edge of the first sliding seal surface 7 and abut against the inner peripheral surface of the shaft hole of the housing 6. A first seal surface 11 is formed.

  The side surface 25 on the non-sealing fluid side of the seal ring body 2 and the side surface 35 on the non-sealing fluid side of the connecting member 3 are continuously coupled via the edge of the second sliding seal surface 8, and the annular groove 5 A second seal surface 12 is formed in contact with the non-sealed fluid side wall.

  The first sealing surface 11 and the second sealing surface 12 prevent leakage of the sealing fluid to the non-sealing fluid side.

As shown in FIGS. 4 and 5, the gap 91 on the non-sealing fluid side includes the end surface 23 a of the concave portion on the non-sealing fluid side of the seal ring body 2 and the end surface 33 a of the convex portion 30 on the non-sealing fluid side of the connecting member 3. A space formed by the first sliding contact surface 21 and the second sliding contact surface 22, the non-sealed fluid side wall of the annular groove 5 of the shaft 4, and the inner peripheral surface of the shaft hole of the housing 6, The sealed fluid side region is sealed by the first seal surface 11, the second seal surface 12, the first sliding seal surface 7, and the second sliding seal surface 8. Accordingly, leakage of the sealing fluid that has entered the gap 91 and the gap 92 on the sealing fluid side to the non-sealing fluid side is prevented.

  When the circumferential length of the seal ring main body 2 or the connecting member 3 changes due to a temperature change, the first sliding contact surface 21 and the first sliding contact surface 31, and the second sliding contact surface 22 and the second sliding contact surface 32 are respectively in the circumferential direction. Although the distances in the circumferential direction of the gap 91 and the gap 92 change with each other, the first sliding contact surface 21 and the first sliding contact surface 31, the second sliding contact surface 22 and the second sliding contact surface 32 are respectively It remains in contact. That is, the circumferential length change is absorbed by the gaps 91 and 92, and the first sliding seal surface 7 and the second sliding seal surface 8 are always maintained.

  Then, the outer peripheral surface 24 of the seal ring main body 2 and the outer peripheral surface 34 of the connecting member 3 are separated from the side surface 25 on the non-sealing fluid side of the seal ring main body 2 and the non-connection of the connecting member 3 by the edge of the first sliding seal surface 7. The side surfaces 35 on the sealing fluid side are always connected by the edge of the second sliding seal surface 8 respectively.

  That is, even if the circumference of the seal ring body 2 or the connecting member 3 changes, the first seal surface 11 and the second seal surface 12 are always maintained, and stable sealing performance can be realized.

  The seal ring 1 according to the present embodiment includes a seal ring main body 2 cut at one place in the circumferential direction and a connecting member 3 that supplements the cut portion. The cutting part of the seal ring body 2 has a certain distance in advance in order to connect the connecting member 3. If it does so, when mounting the seal ring main body 2 in the annular groove 5 by the space | interval, the quantity which expands between the edge parts of the seal ring main body 2 can be reduced. In this way, the amount of expansion between the ends of the seal ring at the time of mounting can be reduced, so that mounting becomes easy. Therefore, the wearability is improved.

  In addition, the reduction in the amount of expansion between the end portions of the seal ring also reduces the amount of deformation of the seal ring during mounting. And the force concerning a seal ring main body at the time of mounting | wearing also reduces. Then, damage to the seal ring due to deformation can be suppressed.

  Furthermore, since the seal ring according to the present embodiment connects the both ends with a connecting member to form a ring shape, it is not necessary to fit the ends of the seal ring together. Therefore, unlike the conventional case, a brazing process for fitting the ends of the seal ring is not necessary, and the production efficiency can be improved.

  Further, since the seal ring according to the present embodiment is not deformed by brazing, the seal ring can be manufactured with a stable curvature. Accordingly, the sealing performance of the seal ring can be stabilized.

(Embodiment 2)
FIG. 7 is a schematic partial enlarged front view and a schematic partial enlarged plan view of a seal ring according to a second embodiment of the present invention.

  In the above embodiment, the case where two protrusions 30 provided on the connection member 3 are provided on both sides has been described, but one may be provided on both sides as shown in FIG. In this case, the recess 20 of the seal ring body 2 may have a shape that sandwiches the recess 30.

  Since other configurations and operations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

(Embodiment 3)
FIG. 8 is a schematic partially enlarged perspective view of a seal ring according to a third embodiment of the present invention.

  In the present embodiment, as shown in FIG. 8, both the seal ring body 2 and the connecting member 3 are provided with a convex portion protruding in the circumferential direction and a concave portion corresponding thereto. The convex portion of the seal ring body 2 is provided on the non-sealing fluid side, and the convex portion of the connecting member 3 is provided on the sealing fluid side, and protrudes alternately. And each surface perpendicular | vertical to an axis | shaft mutually slidably contacts and forms the 1st sliding seal surface 7. FIG.

  Since other configurations and operations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

(Embodiment 4)
FIG. 9 is a schematic partially enlarged perspective view of a seal ring according to a fourth embodiment of the present invention.

  In the present embodiment, as shown in FIG. 9, one convex portion of the seal ring body 2 is provided on the non-sealing fluid side, and the other convex portion is provided on the sealing fluid side. The convex portion is provided on the sealed fluid side, and the other convex portion is provided on the non-sealed fluid side.

  Since other configurations and operations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

FIG. 1 is a schematic front view of a seal ring according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the seal ring according to the first embodiment of the present invention. FIG. 3 is a schematic perspective view of the seal ring according to the first embodiment of the present invention. FIG. 4 is a schematic perspective view of the seal ring according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the seal ring according to the first embodiment of the present invention. FIG. 6 is a schematic view of the seal ring according to the first embodiment of the present invention. FIG. 7 is a schematic view of a seal ring according to the second embodiment of the present invention. FIG. 8 is a schematic perspective view of a seal ring according to a third embodiment of the present invention. FIG. 9 is a schematic perspective view of a seal ring according to a fourth embodiment of the present invention. FIG. 10 is a schematic front view of a seal ring according to the prior art. FIG. 11 is a schematic cross-sectional view of a seal ring according to the prior art. FIG. 12 is a schematic perspective view of a seal ring according to the prior art. FIG. 13 is a schematic perspective view of a seal ring according to the prior art. FIG. 14 is a schematic front view of a seal ring according to the prior art. FIG. 15 is a schematic front view of a seal ring according to the prior art. FIG. 16 is a schematic front view of a seal ring according to the prior art. FIG. 17 is a schematic cross-sectional view of a seal ring according to the prior art. FIG. 18 is a schematic plan view of a seal ring according to the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal ring 11 1st seal surface 12 2nd seal surface 2 Seal ring main body 20 Concave part 3 Connecting member 30 Convex part 4 Shaft 5 Annular groove 6 Housing 7 First sliding seal surface 8 Second sliding seal surface 91, 92 Crevice

Claims (2)

In a seal ring that is attached to an annular groove provided in one member of a housing having a shaft hole and a shaft inserted into the shaft hole, and seals an annular gap between these two members,
A seal ring is constituted by a seal ring body cut at one place in the circumferential direction, and a connecting member provided at the cut portion and connected to both ends of the seal ring body,
A connecting portion between the seal ring body and the connecting member includes a first sliding seal surface that is perpendicular to the shaft and slidable in the circumferential direction, and a second slide that is concentric with the shaft and slidable in the circumferential direction. An uneven fitting that forms a gap that can absorb a change in the circumferential length of the seal ring body or the connection member between the opposite surfaces of the connection member and the opposite ends of the seal ring body while forming a dynamic seal surface Fitted together,
The seal ring main body and the connection member form a first seal surface that abuts against the other member and a second seal surface that abuts against a side surface of the annular groove on the non-sealing fluid side. ring. An edge on the other member side of the first sliding seal surface is in contact with the other member,
An end edge of the second sliding seal surface on the non-sealing fluid side is in contact with a side surface of the annular groove on the non-sealing fluid side,
The first seal surface includes a peripheral surface on the other member side of the seal ring main body and a peripheral surface on the other member side of the connection member continuously via an edge of the first sliding seal surface. Formed by being bonded to
In the second seal surface, the side surface on the non-sealing fluid side of the seal ring body and the side surface on the non-sealing fluid side of the connection member are continuously coupled via an edge of the second sliding seal surface. The seal ring according to claim 1, wherein the seal ring is formed.

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