JP2018119672A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which is suppressed in co-rotation.SOLUTION: This sealing device 1 attached to an attachment groove 52 which is formed at an internal peripheral face of a housing 51 or an external peripheral face of a shaft 50 in order to seal an annular clearance between the relatively-rotating shaft 50 and the housing 51 comprises: a resin ring 2 contacting with an opposite peripheral face of the attachment groove 52 so as to be slidable and sealable; and a rubber ring 3 arranged at a back face side of the resin ring 2 of the attachment groove 52. A plurality of grooves 4 are formed at one of one side face, the other side face or both the side faces of the rubber ring 3, and the sealing device is partitioned to a plurality of polygonal blocks by the plurality of the grooves 4 at one of one side face 32, the other side face 33 or both the side faces 32, 33 of the rubber ring 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device, and more particularly, to a sealing device in which the circulation is suppressed.

  For example, a rotary seal is used as a sealing device in a machine tool rotary joint or rotary joint of a general industrial machine, or a center swivel (center joint) portion of a construction machine such as a power shovel or a crane.

  Patent Document 1 discloses a sealing device that includes a resin ring that slidably comes into contact with a rotating shaft as a seal for rotation, and a rubber ring that is provided on the back surface of the resin ring.

JP 2002-295589 A

  However, the conventional sealing device has found room for further improvement from the viewpoint of suppressing the rotation of the sealing device that rotates with the rotation of the rotary shaft. Suppressing the circulation also extends the life of the sealing device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sealing device that suppresses the operation.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

1.
In order to seal an annular gap formed between a relatively rotating shaft and a housing, the sealing device is mounted on an inner peripheral surface of the housing or an attachment groove formed on an outer peripheral surface of the shaft,
A resin ring that slidably seals against the opposing circumferential surface of the mounting groove;
A rubber ring provided on the back side of the resin ring of the mounting groove,
A plurality of grooves are provided on one of the side surface, the other side surface, or both side surfaces of the rubber ring, and the plurality of grooves provide either one side surface, the other side surface or both side surfaces of the rubber ring. The sealing device is divided into a plurality of polygonal blocks.
2.
2. The sealing device according to claim 1, wherein a part of the plurality of grooves penetrates to a back surface of the rubber ring.
3.
The sealing device according to claim 1 or 2, wherein the plurality of grooves include a plurality of radial grooves along a radial direction of the rubber ring and a plurality of circumferential grooves along a circumferential direction of the rubber ring. .
4).
4. The sealing device according to 1, 2, or 3, wherein the polygonal block is a quadrangular block.
5.
A plurality of axial grooves along the axial direction are provided on the back surface of the rubber ring so as not to cross from the one side surface to the other side surface of the rubber ring. The sealing apparatus in any one of -4.
6).
6. The sealing device according to 5 above, wherein the axial groove is connected to the plurality of grooves provided on one side surface, the other side surface, or both side surfaces of the rubber ring.
7).
The plurality of grooves are provided on both side surfaces of the rubber ring,
The back surface of the rubber ring is connected to the plurality of grooves provided on the other side of the rubber ring and the axial groove connected to the plurality of grooves provided on one side of the rubber ring. The sealing device according to claim 6, wherein the formed axial grooves are provided so that the formation positions of the rubber ring in the circumferential direction are shifted from each other.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing device with which rotation is suppressed can be provided.

The top view of the sealing device concerning a 1st embodiment (A) is a side view of the sealing device shown in FIG. 1, and (b) is a cross-sectional view taken along the line bb of the sealing device shown in FIG. Sectional drawing explaining the mounting state (sealing structure) of the sealing device which concerns on 1st Embodiment The top view of the sealing device concerning a 2nd embodiment Sectional drawing explaining the mounting state (sealing structure) of the sealing device which concerns on 2nd Embodiment. The top view of the sealing device concerning a 3rd embodiment (A) is a side view of the sealing device shown in FIG. 6, and (b) is a cross-sectional view taken along the line bb of the sealing device shown in FIG. Cutaway perspective view of the sealing device shown in FIG. Sectional drawing explaining the mounting state (sealing structure) of the sealing device which concerns on 3rd Embodiment. Sectional drawing explaining the other example of the sealing device which concerns on 3rd Embodiment. The figure which illustrates the aspect of a plurality of grooves notionally

  The sealing device of the present invention is used for sealing (sealing) an annular gap formed between a relatively rotating shaft and a housing. The sealing device according to the first embodiment described below is mounted in a mounting groove formed on the inner peripheral surface of the housing, and the inner peripheral surface of the sealing device is slidably contacted with the outer peripheral surface of the shaft. Let it seal. The sealing device according to the second embodiment is mounted in a mounting groove formed on the outer peripheral surface of the shaft, and seals the outer peripheral surface of the sealing device by slidably sealingly contacting the inner peripheral surface of the housing.

  First, the sealing device according to the first embodiment will be described with reference to FIGS. 1 to 3, and then the sealing device according to the second embodiment will be described with reference to FIGS. 4 and 5.

[First Embodiment]
FIG. 1 is a plan view of the sealing device according to the first embodiment. 2A is a side view of the sealing device shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line bb of the sealing device shown in FIG. FIG. 3 is a cross-sectional view illustrating a sealing structure using a sealing device.

  As shown in FIGS. 1 to 3, the sealing device 1 is provided on a resin ring 2 having a sliding surface 21 for slidably sealingly contacting the outer peripheral surface of a shaft 50, and on the back side of the resin ring 2. And a rubber ring 3 to be formed. In the first embodiment, the back surface side of the resin ring 2 is the opposite side of the sliding surface 21 in the sealing device 1, and is the groove bottom 53 side of the mounting groove 52 provided in the housing 51.

  The resin ring 2 is a ring having a square cross section, and a resin material having low sliding resistance and excellent wear resistance is selected. As the resin material, for example, a thermoplastic resin such as polytetrafluoroethylene (abbreviation PTFE) or nylon material can be used.

  On the other hand, the rubber ring 3 is a ring having the same width as the resin ring 2 and a square cross section. For the rubber ring 3, for example, a rubber-like elastic material such as NBR (nitrile rubber), HNBR (hydrogenated nitrile rubber) or urethane rubber can be used.

  The rubber ring 3 is joined to the back side of the resin ring 2. For joining, various methods such as baking can be used.

  Due to the elasticity of the rubber ring 3, a force for pressing the resin ring 2 from the back side toward the sliding surface 21 side is generated. Thereby, the surface pressure of the sliding surface 21 which contacts the outer peripheral surface of the shaft 50 is improved, and good sealing performance is exhibited.

  Such an increase in the surface pressure contributes to the achievement of good sealing properties, and at the same time may contribute to the operation in the prior art. On the other hand, according to the present invention, since the plurality of grooves 4 are formed in the rubber ring 3, the circulation can be suppressed while exhibiting good sealing performance. This will be described in detail below.

  In the present invention, a plurality of grooves 4 are provided on each of the one side surface 32 and the other side surface 33 of the rubber ring 3. Hereinafter, although one side surface 32 of the rubber ring 3 will be mainly described, this description can also be applied to the other side surface 33 of the rubber ring 3.

  The plurality of grooves 4 are configured by connecting a plurality of grooves 41 and 42 having different formation directions on one side surface 32 of the rubber ring 3. The connection between the grooves can be made by crossing. By the plurality of grooves 4, one side surface 32 of the rubber ring 3 is partitioned into a plurality of polygonal blocks.

  In the present embodiment, the plurality of grooves 4 are formed by connecting a plurality of radial grooves 41 and a circumferential groove 42 to each other.

  Each of the plurality of radial grooves 41 is provided along the radial direction of the rubber ring 3. The plurality of radial grooves 41 are provided at predetermined intervals in the circumferential direction of the rubber ring 3.

  The plurality of circumferential grooves 42 are each provided along the circumferential direction of the rubber ring 3. Here, two concentric circumferential grooves 42 are provided on one side surface 32 of the rubber ring 3. A circumferential groove 42 provided on the outer circumferential side intersects with a plurality of radial grooves 41.

  In the present embodiment, the circumferential groove 42 provided on the outer peripheral side and the plurality of radial grooves 41 are crossed so that the groove extends in four directions from the intersection. On the other hand, the circumferential groove 42 provided on the inner circumferential side also intersects with the plurality of radial grooves 41. Moreover, the circumferential groove | channel 42 provided in the inner peripheral side and the some radial groove | channel 41 are made to cross | intersect so that a groove | channel may extend in 3 directions from an intersection.

  The plurality of grooves 4 divide one side surface 32 of the rubber ring 3 into a plurality of rectangular blocks by the radial grooves 41 and the circumferential grooves 42 described above.

  The plurality of grooves 4 are formed so as to cut out a part of the back surface 31 of the rubber ring 3. Here, since the outer peripheral end of the radial groove 41 is formed to the outer peripheral end of the rubber ring 3, a part of the back surface 31 of the rubber ring 3 is cut away. That is, some of the plurality of grooves 4 (here, the radial grooves 41) are penetrated to the outer peripheral surface which is the back surface 31 of the rubber ring 3.

  In one side surface 32 of the rubber ring 3, the plurality of grooves 4 are formed over a width less than the entire radial width of the rubber ring 3, and a region where the plurality of grooves 4 are not formed on the resin ring 2 side. Is present. This region can be brought into contact with one side wall 54 of the mounting groove 52 to exhibit a sealing function.

  As shown in FIG. 3, the sealing device 1 described above seals an annular gap between the outer peripheral surface of the rotating shaft 50 and the inner peripheral surface of the housing 51 that concentrically surrounds the shaft 50. Therefore, it is mounted in an annular mounting groove 52 formed on the inner peripheral surface of the housing 51 to form a sealing structure.

  The thickness in the radial direction of the sealing device 1 when not attached is designed to be larger than the width from the groove bottom 53 of the mounting groove 52 to the outer peripheral surface of the shaft 50, that is, has a crushing allowance. Therefore, in the sealing device 1 at the time of mounting, the sliding surface 21 of the resin ring 2 abuts on the outer peripheral surface of the shaft 50 so as to be slidable. Further, the back surface 31 of the rubber ring 3 contacts the groove bottom 53 of the mounting groove 52. The sealing device 1 can seal the annular gap by the sliding surface 21 and the back surface 31 functioning as a sealing surface.

  In the present embodiment, the sealing device 1 is configured to seal oil as a fluid to be sealed on both sides of the sealing device 1, and hydraulic pressures P and P ′ shown as two arrows in FIG. 3 are alternately loaded. Can be done. Here, FIG. 3 shows a state when the hydraulic pressure P is applied from the lower annular gap.

  When the hydraulic pressure P is applied, the sealing device 1 is pressed upward in the mounting groove 52, and one side 32 side of the rubber ring 3 is pressed against one side wall 54 of the mounting groove 52.

  By forming the plurality of grooves 4 on the one side surface 32 of the rubber ring 3, an effect of suppressing the rotation of the sealing device 1 following the shaft 50 can be obtained. Thereby, deterioration due to wear or the like of the sealing device 1 is suppressed, and an effect of extending the life of the sealing device 1 can be obtained.

  That is, due to the presence of the plurality of grooves 4, the contact area where one side surface 32 contacts one side wall 54 of the mounting groove 52 is reduced, and the contact surface pressure is improved. Due to the improvement of the surface pressure, the circulation is suppressed. In particular, a high contact surface pressure is generated at a portion corresponding to four sides of each rectangular block defined by the plurality of grooves 4, and a higher contact surface pressure is generated at a portion corresponding to the four apexes. By forming a large number of such square blocks at multiple locations, a high contact surface pressure is distributed over a wide area, and the effect of suppressing the rotation is satisfactorily exhibited.

  Even if the sliding surface 21 of the resin ring 2 is pressed against the shaft 50 with a high surface pressure by the rubber ring 3 in order to exhibit good sealing performance, the plurality of blocks defined by the plurality of grooves 4 are attached to the mounting grooves 52. Due to the high surface pressure that presses one of the side walls 54, a braking action that suppresses the rotation is strong. Thereby, the rotation can be suppressed while exhibiting good sealing performance.

  In particular, since the plurality of grooves 4 are penetrated through the back surface 31 of the rubber ring 3, the plurality of grooves 4 preferably function as an oil passage for removing the broken oil film on the back surface 31 side, thereby suppressing the circulation. The effect is exhibited even better. The radial grooves 41 constituting the plurality of grooves 4 exhibit such an oil removing function satisfactorily.

  In a conventional sealing device composed of a resin ring and a rubber ring, the sliding surface can be changed to the back side (groove of the mounting groove between the rubber ring and the sealing device) by applying PTFE or the like having a small friction coefficient to the sliding surface of the resin ring. Lower friction than contact with the bottom). It was thought that this could suppress the circulation to some extent, but it was found that the suppression of the circulation was not sufficient particularly in the following cases (1) and (2).

  (1) Lubricating oil is not always supplied to the sliding surface of the sealing device (that is, the oil to be sealed is not always pressurized), and it is difficult to obtain lubrication of the sliding surface. When the oil film in between is squeezed out and the friction coefficient of the sliding surface increases.

  (2) When oil intervenes on the back side of the sealing device and the friction coefficient on the back side decreases.

  On the other hand, since the present invention utilizes the improvement in the surface pressure and the friction coefficient between the sealing device and the side wall of the mounting groove, the effect of suppressing the circulation even in the cases (1) and (2) above. Is exhibited well, and there is a remarkable effect in comparison with the prior art.

  In the present embodiment, a plurality of grooves 4 are also provided on the other side surface 33 of the rubber ring 3. For this reason, even when the hydraulic pressure P ′ becomes a high pressure instead of the hydraulic pressure P, the effect of suppressing the rotation is satisfactorily exhibited. In this case, the other side surface 33 provided with the plurality of grooves 4 acts on the other side wall 55 of the mounting groove 52, and the above effect is exhibited.

  In the present embodiment, the resin ring 2 may be formed with an annular groove 20 dug in a ring shape on the sliding surface 21. Thereby, in the sliding surface 21 of the resin ring 2, the contact area which contacts the outer peripheral surface of the axis | shaft 50 reduces, and a contact surface pressure improves. Further, the oil flowing from the side surface adjacent region of the sealing device 1 can be held in the annular groove 20 of the sliding surface 21 to reduce the sliding resistance. In the present embodiment, the shape, size, and number of the annular groove 20 can be set as appropriate and are not particularly limited.

  In this embodiment, the taper part 22 may be provided in the one end part and other end part of the sliding surface 21 of the resin ring 2, respectively. Thereby, the sliding resistance of the sliding surface 21 can be reduced. In the present embodiment, the shape and size of the tapered portion 22 can be set as appropriate and are not particularly limited.

  In the present embodiment, the rubber ring 3 may be formed with an annular groove 30 dug in a ring shape on the back surface 31. Thereby, in the back surface 31 of the rubber ring 3, the contact area which contacts the groove bottom 53 of the attachment groove 52 decreases, and a contact surface pressure improves. In the present embodiment, the shape, size, and number of the annular groove 30 can be appropriately set and are not particularly limited.

[Second Embodiment]
Next, with reference to FIG.4 and FIG.5, the sealing device which concerns on 2nd Embodiment is demonstrated. FIG. 4 is a plan view of the sealing device according to the second embodiment. FIG. 5 is a cross-sectional view illustrating a sealing structure using a sealing device.

  The sealing device 1 according to the second embodiment is mounted in an annular mounting groove 52 formed on the outer peripheral surface of the shaft 50 so that the outer peripheral surface of the sealing device 1 can slide with respect to the inner peripheral surface of the housing 51. Seal in sealing contact.

  As shown in FIGS. 4 and 5, the sealing device 1 includes a resin ring 2 that is slidably in contact with the inner peripheral surface of the housing 51, and a rubber ring provided on the back side (inner peripheral side) of the resin ring 2. 3. In the second embodiment, the back surface side of the resin ring 2 is the side opposite to the sliding surface 21 in the sealing device 1, and is the groove bottom 53 side of the mounting groove 52 provided on the shaft 50.

  Similar to the first embodiment described above, a plurality of grooves 4 are formed on one side surface 32 and the other side surface 33 of the rubber ring 3.

  Therefore, in the second embodiment, the plurality of grooves 4 are formed so as to cut out a part of the back surface 301 of the rubber ring 3. Here, since the outer peripheral end of the radial groove 41 is formed to the outer peripheral end of the rubber ring 3, a part of the back surface 301 of the rubber ring 3 is cut away. That is, the plurality of grooves 4 (radial grooves 41) are penetrated to the outer peripheral surface which is the back surface 301 of the rubber ring 3.

  Thereby, also in 2nd Embodiment, the effect by which a circulation is suppressed is acquired. In particular, in the second embodiment, an effect is obtained in which the turning of the sealing device 1 together with the inner peripheral surface of the housing 51 that rotates relative to the shaft 50 is suppressed.

  About each structure of the sealing device 1 which concerns on 2nd Embodiment, the description about the sealing device 1 which concerns on 1st Embodiment mentioned above is used suitably.

[Third Embodiment]
Next, the sealing device according to the third embodiment will be described with reference to FIGS. FIG. 6 is a plan view of the sealing device according to the third embodiment. 7A is a side view of the sealing device shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line bb of the sealing device shown in FIG. 8 is a cutaway perspective view of the sealing device shown in FIG. FIG. 9 is a cross-sectional view illustrating a sealing structure using a sealing device.

  In the present embodiment, an axial groove 43 along the longitudinal direction of the shaft 50 is provided on the back surface 31 of the rubber ring 3.

  By providing the axial groove 43 on the back surface 31 of the rubber ring 3, an effect of further suppressing the rotation can be obtained. That is, when the sealing structure is formed, the surface pressure on the groove bottom 53 of the mounting groove 52 locally increases at the corner portion of the back surface 31 cut out by the axial groove 43. This surface pressure breaks the oil film between the back surface 31 and the groove bottom 53, increases the coefficient of friction (μ) between the back surface 31 and the groove bottom 53, increases the resistance, and the back surface 31 slips against the groove bottom 53. Is prevented. Thereby, the circulation is further suppressed.

  In this embodiment, the rubber ring 3 is provided with radial grooves 41 as a plurality of grooves 4 on both the one side surface 32 and the other side surface 33, and the plurality of axial grooves 43 are in the radial direction of the surfaces 32, 33. It is arranged on one side 32 side and the other side 33 side so as to be connected to the groove 41. Here, one end of the radial groove 41 and one end of the axial groove 43 are connected. As described above, the axial groove 43 is connected to the plurality of grooves 4 on the one side surface 32 or the other side surface 33, whereby a flow path for receiving the broken oil film is secured, and the circulation is further suppressed. The

  The axial groove 43 on the one side surface 32 side extends from the radial groove 41 on the one side surface 32 toward the other side surface 33. On the other hand, the axial groove 43 on the other side 33 is extended from the radial groove 41 on the other side 33 toward the one side 32. However, any axial groove 43 is provided so as not to cross between the side surfaces 32 and 33 (not connected). Thereby, it is possible to prevent blow-through leakage between the one side surface 32 side and the other side surface 33 side.

  In the first embodiment and the second embodiment described above, the case where the plurality of grooves 4 are provided so as to be plane-symmetric with respect to the one side surface 32 and the other side surface 33 of the rubber ring 3 has been described. In the embodiment, the formation positions of the plurality of grooves 4 are shifted in the circumferential direction by a predetermined pitch (here, a half pitch) between the one side surface 32 and the other side surface 33 of the rubber ring 3. Therefore, the axial groove 43 on the one side surface 32 side and the axial groove 43 on the other side surface 33 side are arranged so as to be shifted by a half pitch in the circumferential direction. As described above, the formation position in the circumferential direction of the axial groove 43 on the one side surface 32 side and the axial groove 43 on the other side surface 33 side is shifted from each other, so that the above-described blowout leakage can be more reliably performed. Can be prevented. That is, since there is a region where the axial groove 43 of the other side surface 33 is not formed at the tip of the axial groove 43 extending from the one side surface 32 side, this region functions as a sealing surface to prevent blowout leakage. To do.

  Also in the third embodiment, the annular groove 30 can be provided on the back surface 31 of the rubber ring 3 as in the first embodiment and the second embodiment. In this case, as shown in FIG. 10, the axial groove 43 is preferably provided so as not to be connected to the annular groove 30. Thereby, a blow-through leak can be prevented.

  The third embodiment has been described based on the example of the first embodiment. However, the third embodiment can also be applied to the second embodiment.

  Although the case where the axial grooves 43 are provided on both the one side surface 32 side and the other side surface 33 side has been described here, either one may be omitted.

  Further, in the third embodiment, the configuration in which the formation positions of the plurality of grooves 4 are shifted by a predetermined pitch in the circumferential direction on one side surface 32 and the other side surface 33 of the rubber ring 3 is shown. The present invention may be applied to the first embodiment and the second embodiment.

[Aspects of multiple grooves]
Next, with reference to FIG. 11, the aspect of a some groove | channel is demonstrated. In the present invention, FIG. 11 is a conceptual diagram and shows a state in which the rubber ring 3 is stretched linearly for convenience of explanation. In FIG. 11, the vertical direction is the radial direction, and the horizontal direction is the circumferential direction.

  In the first embodiment and the second embodiment described above, as shown in FIG. 11A, one side surface 32 of the rubber ring 3 is formed by a plurality of grooves 4 including a radial groove 41 and a circumferential groove 42. The case of dividing into rectangular blocks was shown.

  On the other hand, in the example of FIG. 11B, on one side surface 32 of the rubber ring 3, a plurality of inclined grooves 44 that are inclined with respect to both the radial direction and the circumferential direction and a circumferential groove 42 are provided. The side surface 32 is partitioned into rectangular blocks by the groove 4. The quadrangular block partitioned in this way has sides inclined with respect to the radial direction. Like the radial groove 41, the inclined groove 44 preferably functions as an oil passage for removing the broken oil film on the back surface 31 side.

  Further, the block defined by the plurality of grooves 4 is not limited to a quadrangle, and may be a triangle or a polygon that is a pentagon or more. In the example of FIG. 11C, one side surface 32 is partitioned into a plurality of triangular blocks by intersecting two types of inclined grooves 44 having different inclination angles with the circumferential groove 42. Here, an intersection in which the groove extends in six directions from the intersection and an intersection in which the groove extends in four directions from the intersection are included.

  In the example of FIG. 11D, one side surface 32 is partitioned into a plurality of hexagonal blocks by intersecting two types of inclined grooves 44 having different inclination angles with the radial groove 41. . Here, the grooves are crossed so that the grooves extend in three directions from the intersection.

  A high contact surface pressure is generated at a portion corresponding to each side of the polygonal block, and a higher contact surface pressure is generated at a portion corresponding to each vertex. A large number of such polygonal blocks are formed at many locations on the one side surface 32, so that a high contact surface pressure is distributed over a wide area, and the effect of suppressing the rotation is satisfactorily exhibited.

  The dimensions (groove width, groove depth, etc.), the number, the arrangement interval, the number of blocks formed by the plurality of grooves 4 and the like of the plurality of grooves 4 are appropriately set according to the dimensions and applications of the sealing device 1. be able to.

  In the above description, the case where the plurality of grooves 4 are provided on both surfaces of the rubber ring 3 has been described, but the present invention is not limited to this. For example, when there are hydraulic pressures P and P ′ introduced alternately on both sides of the sealing device 1, it is preferable to provide a plurality of grooves 4 on both side surfaces 32 and 33 of the rubber ring 3. In the case where the hydraulic pressure exists only on one side, a plurality of grooves 4 may be provided on one of the side surface 32 and the other side surface 33 of the rubber ring 3.

  In the above description, the case where the shaft 50 of the shaft 50 and the housing 51 rotates is mainly described, but the present invention is not limited to this. It is sufficient that at least one of the shaft 50 and the housing 51 is rotatable, that is, the shaft 50 and the housing 51 may be relatively rotatable.

  The application of the sealing device described above is not particularly limited, for example, for rotation in a machine tool rotary joint or rotary joint of a general industrial machine, or a center swivel (center joint) part of a construction machine such as a power shovel or a crane. It can be used in various fields as a seal or the like.

1: Sealing device 2: Resin ring 20: Annular groove 21: Sliding surface 22: Tapered part 3: Rubber ring 30: Annular groove 31, 301: Back surface 32: One side surface 33: The other side surface 4: Multiple grooves 41 : Radial groove 42: circumferential groove 43: axial groove 44: oblique groove 50: shaft 51: housing 52: mounting groove 53: groove bottom 54: one side wall 55: other side wall

Claims (7)

In order to seal an annular gap formed between a relatively rotating shaft and a housing, the sealing device is mounted on an inner peripheral surface of the housing or an attachment groove formed on an outer peripheral surface of the shaft,
A resin ring that slidably seals against the opposing circumferential surface of the mounting groove;
A rubber ring provided on the back side of the resin ring of the mounting groove,
A plurality of grooves are provided on any one of the side surface, the other side surface, or both side surfaces of the rubber ring, and the plurality of grooves provide either one side surface, the other side surface, or both side surfaces of the rubber ring. The sealing device is divided into a plurality of polygonal blocks.   The sealing device according to claim 1, wherein a part of the plurality of grooves penetrates to a back surface of the rubber ring.   3. The sealing according to claim 1, wherein the plurality of grooves include a plurality of radial grooves along a radial direction of the rubber ring and a plurality of circumferential grooves along a circumferential direction of the rubber ring. apparatus.   The sealing device according to claim 1, wherein the polygonal block is a rectangular block.   The back surface of the rubber ring is provided with a plurality of axial grooves along the axial direction so as not to cross from the one side surface of the rubber ring to the other side surface. The sealing apparatus in any one of 1-4.   The sealing device according to claim 5, wherein the axial groove is connected to the plurality of grooves provided on one side surface, the other side surface, or both side surfaces of the rubber ring. The plurality of grooves are provided on both side surfaces of the rubber ring,
The back surface of the rubber ring is connected to the plurality of grooves provided on the other side of the rubber ring and the axial groove connected to the plurality of grooves provided on one side of the rubber ring. The sealing device according to claim 6, wherein the formed axial grooves are provided so that the formation positions in the circumferential direction of the rubber ring are shifted from each other.

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