JP2017057945A - Seal member, rotary actuator and bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member which can sufficiently suppress the leakage of a medium in a rotary actuator, and can obtain a large oscillation angle, the rotary actuator and a bearing device.SOLUTION: In a rotary actuator 80, a first connecting part of an outer ring groove part 34 and a contact part 32A are arranged so as to extend along a peripheral direction, and a second connecting part of the outer ring groove part and the contact part are arranged so as to extend along an axial direction. The seal member comprises an axial seal member 35 which can cover the first connecting part, and peripheral seal members 36, 37 which can cover the second connecting part. The peripheral seal members have external peripheral faces on which recesses are formed. When the peripheral seal members are arranged so as to cover the second connecting part in a state that the recesses are oriented to the inside of the outer ring groove part 34, at least one side of the external peripheral faces of the peripheral seal members is arranged so as to progress along a portion which is exposed at the inside of the outer ring groove part at the axial seal member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seal member for preventing medium leakage of a rotary actuator, a rotary actuator including the seal member, and a bearing device including the rotary actuator.

  2. Description of the Related Art Conventionally, a rotary actuator is known in which an output shaft swings in the rotation direction by the action of a pressure fluid as a pressure medium and outputs a drive torque.

  Japanese Unexamined Patent Application Publication No. 2004-162585 (Patent Document 1) discloses a rotary actuator provided with a plate for closing the axial clearance between the vane rotor and the case necessary for holding the vane rotor in a swingable manner in the case. Has been. Such a rotary actuator prevents leakage of the working fluid from the working fluid chamber in the axial direction by the axial clearance.

  Japanese Patent Laying-Open No. 2013-113347 (Patent Document 2) discloses a rotary actuator in which a gap between an output shaft and a case is sealed by a seal member formed in a ring shape.

JP 2004-162585 A JP 2013-113347 A

  However, when the pressure of the working fluid (medium) supplied to the working fluid chamber increases in order to swing the control shaft, it is difficult for the rotary actuator to sufficiently suppress the leakage of the medium. Further, the rotary actuator described in Patent Document 2 has a problem that the swing angle is small.

  The present invention has been made to solve the above-described problems. A main object of the present invention is to provide a seal member that can sufficiently suppress medium leakage in a rotary actuator and that can realize a large swing angle.

  Another object of the present invention is to provide a rotary actuator that includes the seal member, can sufficiently suppress leakage of a medium, and has a large swing angle.

  Still another object of the present invention is to provide a bearing device including the rotary actuator.

  The seal member of the present invention includes an oscillating body extending in the axial direction and a support body that supports the oscillating body so as to be able to oscillate in the circumferential direction, and either the oscillating body or the support body is provided along the circumferential direction. An extending groove is formed, and the groove is connected to a contact portion between the rocking body and the support. The seal is used for a rotary actuator that performs rocking motion in the circumferential direction by receiving the pressure of the medium supplied to the groove. It is a member. The first connection part between the groove part and the contact part is arranged so as to extend along the circumferential direction, and an axial seal member capable of covering the first connection part, and a second connection between the groove part and the contact part. The part is disposed so as to extend along the axial direction, and includes a circumferential seal member capable of covering the second connection part. The circumferential seal member has an outer peripheral surface in which a recess is formed. When the circumferential seal member is disposed so as to cover the second connecting portion with the concave portion facing the inside of the groove portion, at least one side of the outer circumferential surface of the circumferential seal member is located inside the groove portion in the axial seal member. It is provided along the exposed part.

  The rotary actuator of this invention is equipped with the said sealing member. The said circumferential direction sealing member is arrange | positioned so that a 2nd connection part may be covered in the state in which the recessed part faced the inner side of the groove part. At least one side of the outer peripheral surface of the circumferential seal member is in line contact or surface contact with a portion of the axial seal member that is exposed inside the groove.

  A bearing device of the present invention includes the bearing including the rotary actuator, an inner ring, and an outer ring formed so as to surround the outer periphery of the inner ring. The rotary actuator and the bearing are arranged so that the circumferential direction and the circumferential direction of the inner ring and the outer ring overlap. A part of the inner ring or the outer ring in the circumferential direction is a load region that receives a radial load when the bearing is stationary. The rotary actuator is provided so that the load area can be moved in the inner ring or the outer ring by swinging the swing body in the circumferential direction with respect to the support body.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing member which can fully suppress the leak of a medium in a rotary actuator and can implement | achieve a big rocking | fluctuation angle can be provided. In addition, according to the present invention, it is possible to provide a rotary actuator that can sufficiently suppress the leakage of the medium and has a large swing angle, and a bearing device including the rotary actuator.

FIG. 3 is a cross-sectional view for explaining the bearing device according to the first embodiment. It is sectional drawing seen from the arrow II-II in FIG. It is the elements on larger scale of the area | region III in FIG. It is sectional drawing which shows the axial direction seal | sticker part shown in FIG. It is the side view seen from the arrow V in FIG. It is a side view which shows the circumferential direction seal part shown in FIG. It is sectional drawing seen from the arrow VII-VII in FIG. It is sectional drawing seen from the arrow VIII-VIII in FIG. FIG. 6 is a diagram for explaining a planetary gear mechanism of a bearing device according to a second embodiment. FIG. 5 is a cross-sectional view for explaining a bearing device according to a second embodiment. It is the elements on larger scale of the area | region containing the contact part of the fixed axis | shaft and spacer in FIG. It is a fragmentary sectional view of the area | region which differs in the area | region shown in FIG. It is sectional drawing in line segment XIII-XIII in FIG. It is sectional drawing of the axial direction sealing member shown in FIG. FIG. 14 is a side view of the circumferential seal member shown in FIG. 13. It is sectional drawing seen from the arrow XVI-XVI in FIG. It is sectional drawing seen from the arrow XVII-XVII in FIG. It is sectional drawing which shows the modification of the axial direction sealing member shown in FIG. It is sectional drawing which shows the other modification of the axial direction sealing member shown in FIG. FIG. 12 is a cross-sectional view showing still another modification of the axial seal member shown in FIG. 11. It is a side view which shows the modification of the circumferential direction sealing member shown in FIG. It is sectional drawing seen from the arrow XXII-XXII in FIG. It is sectional drawing seen from the arrow XXIII-XXIII in FIG. It is a side view which shows the other modification of the circumferential direction sealing member shown in FIG. It is sectional drawing seen from the arrow XXV-XXV in FIG. It is sectional drawing seen from the arrow XXVI-XXVI in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
With reference to FIGS. 1 to 5, the seal members 35, 36 and 37, the rotary actuator 80, and the bearing device 1 according to the first embodiment will be described. The bearing device 1 according to the first embodiment includes a rotating shaft 10, a housing 20, a rolling bearing 30, and a rotary actuator 80. The rotary actuator 80 according to the first embodiment is provided in the bearing device 1 so that the load area of the outer ring 32 that receives a radial load can be moved when the rolling bearing 30 is stationary. The rotary actuator 80 includes an outer ring 32 of the rolling bearing 30 as an oscillating body, a housing 20 as a support, and a moving unit 40 that supplies a first medium to a first space 34A formed between the outer ring 32 and the housing 20. The seal member 35, 36, 37 for closing the first space 34A is mainly provided. The seal members 35, 36, and 37 according to the first embodiment include an axial seal member 35 and circumferential seal members 36 and 37.

  The rotating shaft 10 is a shaft that is rotatably provided in the bearing device 1. The housing 20 is a member provided in the bearing device 1 so as not to rotate.

  Although the rolling bearing 30 should just be provided with arbitrary structures, it is a self-aligning roller bearing, for example. Rolling bearing 30 includes an inner ring 31, an outer ring 32, and a plurality of rolling elements 33 (for example, spherical rollers). The inner ring 31 has a rolling surface in contact with the plurality of rolling elements 33 on its outer peripheral surface, and the outer ring 32 has a rolling surface in contact with the plurality of rolling elements 33 on its inner peripheral surface. ing.

  The inner ring 31 is fitted to the rotating shaft 10 on the inner side of the rolling surface, and the outer ring 32 is fitted to the housing 20 on the outer side of the rolling surface. The inner ring 31 and the rotating shaft 10 are provided so as to be integrally rotatable. The outer ring 32 and the housing 20 are arranged such that their relative positions do not change when the rolling bearing 30 is in operation, but are relatively movable in the circumferential direction during maintenance as described later. That is, the rolling bearing 30 is a so-called outer ring static load rolling bearing.

  In the outer ring 32, an outer ring groove 34 extending in the circumferential direction is formed in a contact portion 32 </ b> A with the housing 20. A contact portion 32 </ b> A between the outer ring 32 and the housing 20 is connected to the outer ring groove portion 34. A connection portion (a first connection portion and a second connection portion described later) between the contact portion 32 </ b> A and the outer ring groove portion 34 is provided so as to surround the entire circumference of the outer ring groove portion 34. The first connecting portion that connects the contact portion 32A and the outer ring groove portion 34 in the axial direction is formed to extend in the circumferential direction. The second connecting portion that connects the contact portion 32A and the outer ring groove portion 34 in the circumferential direction is formed to extend in the axial direction.

  An axial seal member 35 and circumferential seal members 36 and 37 are provided inside the outer ring groove portion 34. The axial seal member 35 is provided so as to be able to cover the first connection portion between the outer ring groove portion 34 and the contact portion 32A. The circumferential seal members 36 and 37 are provided so as to cover the second connection portion between the outer ring groove portion 34 and the contact portion 32A.

  As shown in FIG. 1, the axial seal member 35 has both end portions in the axial direction connected to both end portions in the axial direction of the outer ring groove portion 34. As shown in FIGS. 2 and 3, the axial seal member 35 has both ends in the circumferential direction connected to both ends in the circumferential direction of the outer ring groove 34. As shown in FIGS. 2 and 3, the circumferential seal member 36 is connected to a protruding member 22 described later, and constitutes one end in the circumferential direction of the first space 34 </ b> A. As shown in FIGS. 2 and 3, the circumferential seal member 37 is connected to one end portion in the circumferential direction of the outer ring groove portion 34 and constitutes one end in the circumferential direction of the first space 34 </ b> A. The details of the axial seal member 35 and the circumferential seal members 36 and 37 will be described later.

  Although the cross-sectional shape orthogonal to the circumferential direction of the outer ring groove part 34 should just be arbitrary shapes, it is a rectangle, for example. The cross-sectional shape orthogonal to the axial direction of the outer ring groove portion 34 is, for example, an arc shape. As long as the outer ring groove portion 34 extends in the circumferential direction and has an end portion in the circumferential direction (not connected to the entire circumference), the outer ring groove portion 34 is formed in any region in the circumferential direction over an arbitrary length. It only has to be. Preferably, the outer ring groove 34 is formed over most of the contact portion 32A between the outer ring 32 and the housing 20. More preferably, a plurality of outer ring groove portions 34 are formed in the circumferential direction, and the plurality of outer ring groove portions 34 are arranged so as to face each other with the rotation shaft 10 interposed therebetween. At least one outer ring groove 34 may be formed in the axial direction of one rolling bearing 30 (hereinafter simply referred to as the axial direction), and a plurality of outer ring grooves 34 may be formed. The outer ring groove portion 34 may be formed at an arbitrary position on the contact portion 32A of the outer ring groove portion 34 with the housing 20 in the axial direction, but is formed at the center in the axial direction, for example.

  The inside of the outer ring groove 34 is divided into a first space 34A and a second space 34B that are arranged in the circumferential direction independently of each other by the protruding member 22 and the circumferential seal member 36 that protrude from the housing 20. The first space 34A and the second space 34B are formed so as to extend in the circumferential direction.

  The angle formed between both end portions in the circumferential direction of the first space 34 </ b> A when the first space 34 </ b> A is most expanded and the axis of the bearing 30 corresponds to an angle at which the moving unit 40 can move the outer ring 32 with respect to the housing 20. For example, it can be set to about 160 degrees.

  The protruding member 22 protrudes toward the rotating shaft 10 from the contact portion 32 </ b> A between the outer ring 32 and the housing 20. Although the protrusion member 22 should just be provided with arbitrary structures, it is provided so that the outer ring groove part 34 can be fitted in the circumferential direction of the rolling bearing 30, for example. A region in which the protruding member 22 and the outer ring groove 34 can be fitted is formed wide in the circumferential direction. In other words, the cross-sectional shape perpendicular to the circumferential direction of the outer ring groove portion 34 is provided, for example, equally in the circumferential direction, and the cross-sectional shape perpendicular to the circumferential direction of the outer ring groove portion 34 and the cross-sectional shape perpendicular to the circumferential direction of the protruding member 22. Are equally provided. The cross-sectional shape perpendicular to the circumferential direction of the outer ring groove 34 and the cross-sectional shape perpendicular to the circumferential direction of the protruding member 22 may be different from each other. The axial seal member 35 may not be in contact with the protruding member 22.

  The protruding member 22 has a first through hole 23 for connecting the first space 34A and the outside, and a second through hole 24 for connecting the second space 34B and the outside. That is, the opening end of the first through hole 23 inside the outer ring groove portion 34 and the opening end of the second through hole 24 inside the outer ring groove portion 34 are formed in opposite directions in the circumferential direction. The first through hole 23 and the second through hole 24 are independent of each other.

  The moving part 40 is connected to the first space 34 </ b> A via the first through hole 23 in the protruding member 22. The second space 34 </ b> B is connected to the outside of the housing 20 through the second through hole 24. The moving unit 40 is provided so that the first medium can be supplied to the first space 34A via the protruding member 22 so as to expand the first space 34A. The first medium can be arbitrarily selected from gas and liquid, and is, for example, high-pressure oil. That is, the rotary actuator 80 is, for example, a hydraulic actuator. The rotary actuator 80 receives the hydraulic pressure (the pressure of the first medium) supplied to the outer ring groove portion 34 (the first space 34A formed inside the outer ring groove portion 34) extending in the circumferential direction, and the housing 20 as a support body The outer ring 32 as a rocking body is rocked in the circumferential direction.

  Next, the axial seal member 35 and the circumferential seal members 36 and 37 according to the first embodiment will be specifically described with reference to FIGS.

  The axial seal member 35 is a connection portion (first connection portion) between at least a contact surface between the housing 20 and the outer ring 32 and an inner peripheral surface extending in a direction (for example, radial direction) intersecting the axial direction in the outer ring groove portion 34. It is provided so as to cover. The axial seal member 35 includes, for example, seal portions 351 and 352 and a connection portion 353 that connects between the seal portions 351 and 352. The material constituting the axial seal member 35 may be any material having elasticity and resistance to the first medium. For example, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, silicone rubber, fluorine Rubber such as rubber, ethylene propylene rubber, styrene butadiene rubber, natural rubber, fluorine resin, polyimide resin, polyamide imide resin, polyether ether ketone resin, polyphenylene sulfide resin, polyamide resin, polyethylene resin, polyacetal resin, polyethylene terephthalate resin, polyurethane Examples thereof include resins such as resins, epoxy resins, unsaturated polyester resins, phenol resins, and ABS resins, materials obtained by reinforcing the above materials with fibers, and materials laminated with different materials.

  The seal portions 351 and 352 are provided such that the outer peripheral end and the inner peripheral end in the radial direction of the axial seal member 35 can be configured. The seal portions 351 and 352 include an outer peripheral end E1 that is in surface contact or line contact with the housing 20 in the radial direction, and an outer ring 32 (at least part of an inner peripheral surface that extends along the axial direction and the circumferential direction of the outer ring groove portion 34). It has an inner peripheral end E2 in surface contact or line contact, and a side end E3 in surface contact or line contact with the inner peripheral surface of the outer ring groove 34. The seal portions 351 and 352 are opposed to each other across the first space 34A and the second space 34B in the axial direction. In other words, the side end located on the opposite side of the side end E3 in the seal portions 351 and 352 faces the first space 34A and the second space 34B.

  The connecting portion 353 is provided so as to connect, for example, the inner peripheral ends E2 of the seal portions 351 and 352, and has an inner peripheral end continuous with the inner peripheral end E2 of the seal portions 351 and 352. The outer peripheral surface located on the opposite side of the inner peripheral end E2 in the connection portion 353 faces the first space 34A and the second space 34B. The inner peripheral end E2 of the axial seal member 35 may be provided so as to be in surface contact with the entire inner peripheral surface extending along the axial direction in the outer ring groove portion 34.

  A portion of the axial seal member 35 exposed to the inside of the outer ring groove portion 34 (a side end located on the opposite side of the side end E3 in the seal portions 351 and 352 and a side opposite to the inner peripheral end E2 in the connection portion 353) The outer peripheral edge) is in line contact or surface contact with the protruding member 22 and the circumferential seal members 36 and 37, and is provided so as to be slidable at least with the protruding member 22 and the circumferential seal member 36. The axial seal member 35 may be provided so as to be slidable with the circumferential seal member 37. Further, the axial seal member 35 may not be in contact with the protruding member 22.

  One end and the other end of the axial seal member 35 in the circumferential direction are respectively connected to one end and the other end of the outer ring groove portion 34 in the circumferential direction. One end of the axial seal member 35 on the side where the first space 34A is formed in the circumferential direction is also connected to a circumferential seal member 37 described later. The axial seal member 35 is preferably slidably connected to the circumferential seal member 36.

  When a plurality of outer ring groove portions 34 are formed in the bearing device 1, the axial seal member 35 is preferably provided in each outer ring groove portion 34 as described above. The two axial seal members 35 shown in FIGS. 1 to 5 are arranged so as to cover the first connection portion in the two outer ring groove portions 34, respectively, and the first space 34A in the outer ring groove portion 34 is pivoted. Sealing in direction.

  The circumferential seal member 36 and the circumferential seal member 37 are provided so as to sandwich the first space 34A in the circumferential direction. The circumferential seal member 36 covers at least the connection portion (second connection portion) between the contact surface of the housing 20 and the protruding member 22 that divides the first space 34A, the first space 34A, and the second space 34B. Is provided. The circumferential seal member 36 has one end E4 in the circumferential direction facing the first space 34A and the other end E5 in the circumferential direction connected to the protruding member 22. As described above, the circumferential seal member 36 is slidably connected to the axial seal member 35.

  The circumferential seal member 37 is provided so as to cover at least a connection portion (second connection portion) between a contact surface between the housing 20 and the outer ring 32 and an inner circumferential surface extending along the radial direction in the outer ring groove portion 34. One end E4 in the circumferential direction of the circumferential seal member 37 faces the first space 34A, and faces the one end E4 of the circumferential seal member 36 with the first space 34A interposed therebetween. The other end E5 in the circumferential direction of the circumferential seal member 37 is connected to an end in the circumferential direction of the outer ring groove 34, and is fixed to the end, for example. The circumferential seal member 37 may be fixed to the axial seal member 35.

  For example, one end E4 of the circumferential seal members 36 and 37 is provided wider than the other end E5. The one end E4 is formed with a recess 38 that is recessed toward the other end E5. As described above, the circumferential seal members 36 and 37 are arranged so that one end E4 thereof faces the first space 34A. At this time, the portion located on the outer peripheral side in the radial direction at the one end E4 of the circumferential seal members 36 and 37 is in line contact or surface contact with the housing 20, and the portion located on the inner peripheral side is the axial seal member 35. Line contact or surface contact with Further, portions of the circumferential seal members 36 and 37 located on one and the other sides in the axial direction at the one end E4 are in line contact or surface contact with the axial seal member 35.

  The concave portions 38 of the circumferential seal members 36 and 37 constitute a part of the first space 34 </ b> A, and the first medium is also supplied into the concave portions 38. Thus, the circumferential seal members 36 and 37 are pressed against the housing 20 or the axial seal member 35 by the first medium supplied into the recess 38.

  The material constituting the axial seal member 35 and the circumferential seal members 36 and 37 may be any material having elasticity and resistance to the first medium, for example, nitrile rubber, hydrogenated nitrile, and the like. Rubber, acrylic rubber, silicone rubber, fluoro rubber, ethylene propylene rubber, styrene butadiene rubber, natural rubber, etc., fluoro resin, polyimide resin, polyamide imide resin, polyether ether ketone resin, polyphenylene sulfide resin, polyamide resin, polyethylene resin Examples thereof include a resin such as polyacetal resin, polyethylene terephthalate resin, polyurethane resin, epoxy resin, unsaturated polyester resin, phenol resin, and ABS resin, a material obtained by fiber-reinforced the above material, and a material laminated with different materials.

  1 to 3 show an example in which the axial seal member 35 and the circumferential seal members 36 and 37 are applied to the bearing device 1 including the rolling bearing 30, but the axial seal member 35 and the circumferential direction described above are used. The seal members 36 and 37 can be similarly applied to the bearing device 1 including a slide bearing.

  Next, functions and effects of the seal members 35, 36, and 37, the rotary actuator 80, and the bearing device 1 according to the first embodiment will be described.

  Seal members 35, 36, and 37 according to the first embodiment are seal members that are used in the rotary actuator 80. In the rotary actuator 80, the first connection portion between the outer ring groove portion 34 and the contact portion 32A is arranged so as to extend along the circumferential direction, and the second connection portion between the outer ring groove portion 34 and the contact portion 32A is It arrange | positions so that it may extend along an axial direction. The seal members 35, 36, and 37 include an axial seal member 35 that can cover the first connection portion, and a circumferential seal member 36 and 37 that can cover the second connection portion. The circumferential seal members 36 and 37 have an outer peripheral surface in which a recess 38 is formed. When the circumferential seal members 36 and 37 are arranged so as to cover the second connection portion with the recess 38 facing the inner side of the outer ring groove portion 34, at least one side of the outer circumferential surface of the circumferential seal members 36 and 37 Is provided along the portion of the axial seal member 35 that is exposed inside the outer ring groove 34.

  In this way, the seal members 35, 36, and 37 can cover the first connection portion and the second connection portion in the rotary actuator 80. Further, since the recess 38 is formed at one end E4 of the circumferential seal members 36 and 37, the circumferential seal members 36 and 37 are pressed from the inside of the recess 38 by the first medium supplied to the first space 34A. Will be. Therefore, the portion in contact with the housing 20 and the axial seal member 35 at one end E4 of the circumferential seal members 36 and 37 is stronger than the case where the recess 38 is not formed. 35 can be contacted. Therefore, the seal members 35, 36, and 37 can suppress the leakage of the first medium supplied to the outer ring groove portion 34 in the rotary actuator 80 from the first connection portion and the second connection portion to the outside. The rocking efficiency by 80 can be improved.

  The seal members 35, 36, and 37 are arranged on the inner side of the outer ring groove portion 34 when the circumferential seal members 36 and 37 are arranged so as to cover the second connection portion with the concave portion 38 facing the inner side of the outer ring groove portion 34. A concave portion 38 is formed at the center of the outer peripheral surface portion (one end E4) facing the surface.

  In this way, the portion provided to surround the entire circumference of the recess 38 at one end E4 of the circumferential seal members 36, 37, that is, the housing 20 and the axial seal at one end E4 of the circumferential seal members 36, 37. The entire portion in contact with the member 35 is pressed from the inside of the recess 38 by the first medium supplied to the first space 34A. Therefore, the entire portion can be in strong contact with the housing 20 and the axial seal member 35. As a result, the seal members 35, 36, and 37 more effectively suppress the leakage of the first medium supplied to the outer ring groove portion 34 in the rotary actuator 80 from the first connection portion and the second connection portion. Thus, the swinging efficiency of the rotary actuator 80 can be increased.

  The axial seal member 35 has a U-shaped cross section orthogonal to the circumferential direction, and the inner circumferential surface of the axial seal member 35 and the outer circumferential surfaces of the circumferential seal members 36 and 37 are in line contact or surface contact. It is made possible.

  Even in this case, the seal members 35, 36, and 37 can cover the first connection portion and the second connection portion in the rotary actuator 80. In this case, the first space 34 </ b> A is formed inside the axial seal member 35 disposed in the outer ring groove 34. Therefore, the axial seal member 35 and the circumferential seal member 36 are formed such that the inner circumferential surface of the axial seal member 35 and the outer circumferential surface of the circumferential seal members 36 and 37 are formed so as to be in line contact or surface contact. Can suppress the leakage of the first medium from the first space 34A to the second space 34B.

  The material constituting the sealing members 35, 36, and 37 preferably has elasticity. In this way, when the circumferential seal members 36, 37 are pressed from the inside of the recess 38 by the first medium supplied to the first space 34A, the recess 38 at one end E4 of the circumferential seal members 36, 37. The portion provided so as to surround can be elastically deformed. As a result, the portions of the circumferential seal members 36 and 37 make stronger contact with the housing 20 and the axial seal member 35 than when the material constituting the circumferential seal members 36 and 37 does not have elasticity. be able to. In addition, along with the elastic deformation of the circumferential seal members 36, 37, the portion of the axial seal member 35 that is in contact with the circumferential seal members 36, 37 can also be elastically deformed. Therefore, the portion of the axial seal member 35 can come into stronger contact with the inner peripheral surfaces of the housing 20 and the outer ring groove portion 34 than when the material constituting the axial seal member 35 does not have elasticity. it can.

  The rotary actuator 80 according to Embodiment 1 includes the sealing member. The circumferential seal members 36 and 37 are arranged so as to cover the second connecting portion in a state where the concave portion 38 faces the inner side of the outer ring groove portion 34. At least one side of the outer peripheral surfaces of the circumferential seal members 36 and 37 is in line contact or surface contact with a portion of the axial seal member 35 exposed inside the outer ring groove portion 34.

  In this way, the rotary actuator 80 can move the other end of the first space 34 </ b> A with a smaller amount of the first medium than in the case where the seal members 35, 36, and 37 are not provided. That is, the rotary actuator 80 including the seal members 35, 36, and 37 can move in the load region more efficiently than a rotary actuator that does not include the seal members 35, 36, and 37.

  The bearing device 1 according to the first embodiment includes the bearing 30 including the rotary actuator 80, the inner ring 31, and the outer ring 32 formed so as to surround the outer periphery of the inner ring 31. The rotary actuator 80 and the bearing 30 are arranged so that the circumferential direction overlaps the circumferential direction of the inner ring 31 and the outer ring 32. A part of the inner ring 31 or the outer ring 32 in the circumferential direction is a load region that receives a radial load when the bearing 30 is stationary. In the bearing device 1, the rotary actuator 80 is provided such that the outer ring 32 as a swinging body is swung in the circumferential direction with respect to the housing 20 as a support so that the inner ring 31 or the outer ring 32 can move the load region. ing.

  In this way, the bearing device 1 including the rotary actuator 80 including the seal members 35, 36, and 37 has a higher load range than the bearing device including the rotary actuator not including the seal members 35, 36, and 37. Can be moved more efficiently and a long bearing life can be realized.

(Embodiment 2)
Next, the seal member, the rotary actuator, and the bearing device according to the second embodiment will be described with reference to FIGS.

  The bearing device 201 according to the second embodiment includes a planetary shaft (fixed shaft) 221, a planetary bearing 230, a spacer 234, and a rotary actuator 80. The rotary actuator 80 according to the second embodiment is provided in the bearing device 201 so that the load area of the inner ring 231 that receives a radial load can be moved when the planetary bearing 230 is stationary. The rotary actuator 80 has a first medium in a first space 235A formed between the inner ring 231 and the spacer 234 of the planetary bearing 230 as a rocking body, the planetary shaft 221 as a support, and the planetary shaft 221 and the spacer 234. And a seal member 91, 92, 93, 94 for closing the first space 235A. The seal members 91, 92, 93, 94 according to the second embodiment include axial seal members 91, 92 and circumferential seal members 93, 94.

  As shown in FIG. 9, the bearing device 201 includes a planetary gear mechanism 200. The planetary gear mechanism 200 includes a sun gear 210, a planetary gear 220, a planetary bearing 230, and an internal gear 240. In the planetary bearing 230, the sun gear 210 is joined to the output shaft 211.

  The planetary gear 220 is connected to the planetary shaft 221 via the planetary bearing 230. The planetary shaft 221 is supported by the carrier 222. The carrier 222 is rotatably provided in the bearing device 201. That is, the planetary gear 220 is supported by the carrier 222 so as to be able to revolve.

  The planetary bearing 230 is, for example, a rolling bearing. The planetary bearing 230 may have an arbitrary structure, but is a self-aligning roller bearing, for example. Planetary bearing 230 includes an inner ring 231, an outer ring 232, and a plurality of rolling elements 33 (for example, spherical rollers). The inner ring 231 has a rolling surface in contact with the plurality of rolling elements 33 on its outer peripheral surface, and the outer ring 232 has a rolling surface in contact with the plurality of rolling elements 33 on its inner peripheral surface. ing.

  The inner ring 231 is fitted to the planetary shaft 221 on the inner side in the radial direction from the rolling surface, and the outer ring 232 is fitted to the planetary gear 220 on the outer side in the radial direction from the rolling surface. The inner ring 231 and the planetary shaft 221 are relatively movable in the circumferential direction R, and are provided so as to be revolved by the carrier 222. The outer ring 232 and the planetary gear 220 are fixed to each other and rotatably provided as a unit. Or outer ring | wheel 232 itself may be comprised as the planetary gear 220, and may be provided rotatably. That is, the rolling bearing 230 is a so-called inner ring static load rolling bearing. When the bearing device 201 is operated, the outer ring 232 rotates in the circumferential direction R, while the inner ring 231 does not rotate in the circumferential direction R.

  In the bearing device 201, any number of rolling bearings 230 may be attached to one planetary shaft 221. For example, two rolling bearings 230 are attached to one planetary shaft 221. The two rolling bearings 230 are arranged in parallel with the spacer 234 in the axial direction, for example, and are relatively positioned by the spacer 234.

  Referring to FIGS. 10 and 13, the spacer 234 is provided in an annular shape like the inner ring 231, and is fitted to the planetary shaft 221 inside thereof. The spacer 234 and the inner ring 231 are fixed to each other so as to be integrally movable at least in the circumferential direction R and the radial direction of the rolling bearing 230 (hereinafter simply referred to as the radial direction). The inner ring 231 and the spacer 234 are provided, for example, so as to be fitted in the axial direction. For example, the inner ring 231 is provided with a recess recessed in the axial direction from the surface connected to the spacer 234 in the axial direction, and the spacer 234 is axially extended from the surface connected to the inner ring 231 in the axial direction. A projecting convex portion is provided, and the inner ring 231 and the spacer 234 may be fixed to each other and movably provided by fitting the convex portion of the spacer 234 into the concave portion of the inner ring 231. . Further, the inner ring 231 and the spacer 234 may be fixed to each other and movably provided as one unit by fitting a convex portion provided on the inner ring 231 and a concave portion provided on the spacer 234. A spacer groove 235 extending in the circumferential direction R is formed on the contact surface of the spacer 234 with the planetary shaft 221.

  A contact portion 234 </ b> A between the spacer 234 and the planetary shaft 221 is connected to the spacer groove 235. A connecting portion (a first connecting portion and a second connecting portion described later) between the contact portion 234A and the spacer groove portion 235 is provided so as to surround the entire circumference of the spacer groove portion 235. The first connection portion that connects the contact portion 234A and the spacer groove portion 235 in the axial direction is formed to extend in the circumferential direction. The second connecting portion that connects the contact portion 234A and the spacer groove portion 235 in the circumferential direction is formed to extend in the axial direction.

  Inside the spacer groove portion 235, axial seal members 91 and 92 and circumferential seal members 93 and 94 are provided. The axial seal members 91 and 92 are provided so as to cover the first connecting portion between the spacer groove portion 235 and the contact portion 234A. The circumferential seal members 93 and 94 are provided so as to be able to cover the second connection portion between the spacer groove portion 235 and the contact portion 234A. The axial seal members 91 and 92 and the circumferential seal members 93 and 94 will be described in detail later.

  As long as the spacer groove portion 235 extends in the circumferential direction R and has an end in the circumferential direction R (not connected to the entire circumference), the spacer groove portion 235 has an arbitrary length in an arbitrary region in the circumferential direction R. It is only necessary to be formed over. From a different point of view, a contact portion 236 that slides with the outer peripheral surface 221A of the planetary shaft 221 is formed in part in the circumferential direction R on the inner peripheral surface 234A of the spacer 234. Preferably, the spacer groove 235 is formed over most of the contact surface between the inner ring 231 and the planetary shaft 221. More preferably, a plurality of spacer grooves 235 are formed in the circumferential direction R, and the plurality of spacer grooves 235 are arranged to face each other with the planetary shaft 221 interposed therebetween.

  At least one spacer groove portion 235 may be formed in the axial direction of one rolling bearing 230 (hereinafter simply referred to as the axial direction), and a plurality of spacer grooves 235 may be formed. The plurality of spacer grooves 235 may have the same configuration or may be different from each other.

  The spacer groove portion 235 may be formed at an arbitrary position on the contact surface of the spacer groove portion 235 with the planetary shaft 221 in the axial direction. For example, the spacer groove portion 235 is formed at the center in the axial direction.

  The interior of the spacer groove 235 includes a first space 235A and a second space 235B that are arranged in the circumferential direction R independently of each other by a projecting member 227 projecting from the planetary shaft 221 and a circumferential seal member 93 connected to the projecting member 227. It is divided into. The first space 235 </ b> A is formed to extend in the circumferential direction R, and one end in the circumferential direction R is one end E <b> 6 of the circumferential seal member 93 and the other end is the circumferential seal member 94. One end E6. The second space 235B is formed to extend in the circumferential direction R, and one end in the circumferential direction R is a connection end surface between the protruding member 227 and the second space 235B, and the other end is It is the other end portion in the circumferential direction R of the spacer groove portion 235.

  Here, since the spacer 234 is provided so as to be movable in the circumferential direction R integrally with the inner ring 231 as described above, the spacer 234 and the inner ring 231 are movable relative to the planetary shaft 221. is there. Therefore, the spacer groove portion 235 provided in the spacer 234 and the protruding member 227 positioned with respect to the planetary shaft 221 are provided so that the relative positional relationship can be changed. When the relative positional relationship between the spacer groove portion 235 and the protruding member 227 is changed, the shape of the spacer groove portion 235 and the protruding member 227 is constant, so that one of the first space 235A and the second space 235B is respectively As it spreads, it changes so that the other narrows.

  The angle formed between both ends in the circumferential direction R of the first space 235 </ b> A when the first space 235 </ b> A is most expanded and the shaft center of the bearing 230 is moved by the moving unit (not shown) moving the inner ring 231 with respect to the planetary shaft 221. It corresponds to a possible angle and can be, for example, about 150 degrees.

  The projecting member 227 projects from the first hole 228 </ b> A toward the outer ring 232 side from the contact surface between the inner ring 231 and the planetary shaft 221 in the inner ring 231. The projecting member 227 is fitted with the spacer groove portion 235 in the axial direction, for example, with one end portion in the radial direction being supported by the support member 229 inside the first hole 228A. Yes.

  The first hole 228A can accommodate the protruding member 227 on the planetary shaft 221 and is provided so that the protruding member 227 can be positioned in the circumferential direction R and the axial direction. The first hole 228A is provided, for example, so as to extend in the radial direction through the axis of the inner ring 231. In this case, the first hole 228A can accommodate the two protruding members 227, and the two protruding members 227 protrude from the first hole 228A toward the outer ring 232 side.

  The support member 229 is connected to the projecting member 227 inside the first hole 228A, and is provided so as to support the projecting member 227 in the radial direction. The connection surface between the protruding member 227 and the support member 229 is inclined with respect to the axial direction and the radial direction. As a result, the support member 229 is inserted into the second hole 28B opened in the end surface in the axial direction A of the planetary shaft 221 and pushed into the first hole 228A, thereby being accommodated in the first hole 228A. The protruding member 227 that has been moved can be moved in the radial direction until it is fitted to the spacer groove 235. That is, the protruding member 227 protrudes from the surface of the planetary shaft 221 depending on whether the supporting member 229 is connected (whether the supporting member 229 is inserted into the first hole 228A) and from the surface. It is provided so that it can be changed to a state where it does not protrude.

  In the spacer 234, a region in which the protruding member 227 and the spacer groove 235 can be fitted is formed wide in the circumferential direction R. In other words, the cross-sectional shape perpendicular to the circumferential direction R of the spacer groove 235 is equally provided over the circumferential direction R. The cross-sectional shape perpendicular to the circumferential direction R of the spacer groove 235 is provided, for example, approximately equal to the cross-sectional shape perpendicular to the circumferential direction R of the protruding member 227.

  Referring to FIG. 13, the planetary shaft 221 has a first flow hole 223 for connecting the first space 235A and the outside, and a second flow hole 224 for connecting the second space 235B and the outside. Is formed. That is, the first flow hole 223 and the second flow hole 224 are arranged so as to sandwich the protruding member 227 and the first hole 228A in the circumferential direction R. The first flow hole 223 and the second flow hole 224 provided across the protruding member 227 are provided to be connectable to the same spacer groove portion 235. When a plurality of spacer grooves 235 are formed in the circumferential direction R, the first circulation holes 223, the second circulation holes 224, the protruding members 227, and the spacer grooves 235 are provided rotationally symmetrically in the circumferential direction R. It is preferable.

  The moving part (not shown) is provided so as to be connectable to the first space 235 </ b> A via the first flow hole 223 in the planetary shaft 221. In the bearing device 201, for example, a hose introduction port 51 for connecting a hose capable of flowing the first medium to the first flow hole 223, which is connected to the moving unit, is formed. For example, the hose may be introduced from the hose introduction port 51 and connected to the first flow hole 223. That is, the moving unit may not be connected to the first flow hole 223 when the bearing device 201 is operated. Note that the second space 235 </ b> B is connected to the outside of the bearing device 201 via the second flow hole 224.

  The moving unit (not shown) is provided so as to supply the first medium to the first space 235A via the planetary shaft 221 so as to expand the first space 235A. The first medium can be arbitrarily selected from gas and liquid, and is, for example, high-pressure oil. That is, the rotary actuator 80 is, for example, a hydraulic actuator. The rotary actuator 80 receives the hydraulic pressure (pressure of the first medium) supplied to the spacer groove portion 235 (the first space 235A formed inside thereof) extending along the circumferential direction, and the planetary shaft 221 as a support body. On the other hand, the inner ring 231 as the swinging body is swung in the circumferential direction.

  Next, the axial seal members 91 and 92 and the circumferential seal members 93 and 94 according to the second embodiment will be specifically described with reference to FIGS. The circumferential seal members 93 and 94 basically have the same configuration as the circumferential seal members 36 and 37 according to the first embodiment.

  As shown in FIG. 11, the axial seal members 91 and 92 are at least a contact surface between the spacer 234 and the planetary shaft 221 and a direction (for example, radial) that intersects the axial direction at the spacer groove portion 235 (see FIG. 13). It is provided so as to cover the connecting portion with the inner peripheral surface extending along the direction. Further, the axial seal members 91 and 92 serve as a connection portion between the connecting surface (the outer peripheral surface of the protruding member 227 and the inner peripheral surface of the first hole 228A) between the protruding member 227 and the planetary shaft 221 and the first space 235A. It is provided to cover. One axial seal member 91, 92 is provided at a position facing each other across the first space 235A in the axial direction. The axial seal members 91 and 92 are respectively provided along the circumferential direction R (see FIG. 13). For example, one end (contact portion 236) and the other end (contact portion 236) of the spacer groove portion 235 in the circumferential direction. Are provided in a semicircular arc shape.

  As shown in FIG. 11, the axial seal member 91 faces the first space 235 </ b> A, and the circumferential seal members 93 and 94 and the projecting member 227 (particularly from the first hole 228 </ b> A of the planetary shaft 221). The protrusion 227E) protruding in the radial direction is in surface contact or line contact. The axial seal member 91 is slidably provided with the circumferential seal member 93 and the protruding member 227. The axial seal member 91 may be fixed to the circumferential seal member 94.

  As shown in FIG. 11, the axial seal member 91 is in surface contact with the axial seal member 92. The axial seal member 91 preferably has a surface extending along the axial direction and a surface extending along the radial direction, and the two surfaces are preferably in surface contact with the axial seal member 92, respectively.

  The axial direction seal member 91 has, for example, an outer peripheral end in the radial direction in surface contact or line contact with the spacer 234, and an inner peripheral end in surface contact with the planetary shaft 221.

  As shown in FIG. 11, the axial seal member 92 is disposed between the axial seal member 91 and the spacer 234 in the axial direction. The axial seal member 92 is disposed behind the axial seal member 91 as viewed from the first space 235A. The axial direction sealing member 92 has an outer circumferential end in the radial direction that is in surface contact or line contact with the spacer 234, and an inner circumferential end that is in surface contact or line contact with the axial direction sealing member 91. One end in the axial direction of the axial seal member 92 is in surface contact or line contact with the axial seal member 91, and the other end is in surface contact or line contact with the spacer 234. The axial seal member 92 is restricted by the spacer 234 from moving in the axial direction in the spacer groove 235. The axial seal member 92 is restricted by the spacer 234 from moving radially outward in the spacer groove 235.

  In the case where a plurality of spacer groove portions 235 are formed in the bearing device 201, the axial seal members 91 and 92 are preferably provided in each spacer groove portion 235 as described above. When two spacer groove portions 235 are formed, it is preferable that two axial seal members 91 and 92 are disposed in each spacer groove portion 235, respectively.

  Referring to FIGS. 11 and 14, the axial seal members 91 and 92 have, for example, an L-shaped cross section perpendicular to the circumferential direction R (see FIG. 3). FIG. 14 is an enlarged cross-sectional view of the axial seal members 91 and 92 shown in FIG. The axial seal members 91 and 92 are, for example, in the cross section, a first portion 911 and 921 formed so as to extend along the radial direction, and a second portion formed so as to extend along the axial direction ( And portions 912 and 922 protruding in the axial direction with respect to the portions 911 and 921.

  As shown in FIGS. 11 and 14, the first portion 911 formed to extend along the radial direction of the axial seal member 91 is the second portion formed to extend along the axial direction. The side surface on which 912 is located is in surface contact with the axial seal member 92. The first portion 911 of the axial seal member 91 faces the first space 235A on the side surface opposite to the side surface in surface contact with the axial seal member 92, and the circumferential seal member 93, 94 and the projecting member 227 (projection 227E thereof) are in surface contact or line contact. In addition, the outer peripheral end and the inner peripheral end of the first portion 911 of the axial seal member 91 are in surface contact or line contact with the spacer 234 and the planetary shaft 221, respectively. The second portion 912 of the axial seal member 91 has an outer peripheral surface and an inner peripheral surface in the radial direction that are in surface contact or line contact with the axial seal member 92 and the planetary shaft 221, respectively. The second portion 912 of the axial seal member 91 is preferably provided so as to be spaced from the spacer 234 in the axial direction. The second portion 912 may be provided so as to contact the spacer 234 in the axial direction.

  As shown in FIGS. 11 and 14, the first portion 921 formed so as to extend along the radial direction of the axial seal member 92 is sandwiched by spacers 234 in the axial direction. Specifically, the spacer groove 235 has two inner peripheral surfaces that extend along the radial direction and face each other. The first portion 921 of the axial seal member 92 is in surface contact with the two inner peripheral surfaces of the spacer groove 235. The first portion 921 of the axial seal member 92 and the second portion 922 formed so as to extend along the axial direction of the axial seal member 92 have an outer circumferential surface and an inner circumferential surface in the radial direction, respectively. 234 and the axial seal member 91 are in surface contact or line contact.

  As shown in FIG. 13, the circumferential seal member 93 and the circumferential seal member 94 are provided so as to sandwich the first space 235A in the circumferential direction. The circumferential seal member 93 includes at least a contact surface between the protruding member 227 and the spacer 234 and a connection surface between the protruding member 227 and the planetary shaft 221 (an outer peripheral surface of the protruding member 227 and an inner peripheral surface of the first hole 228A). The spacer groove portion 235 (the first space 235A) is provided so as to cover the connection portion (second connection portion) with the spacer groove portion 235 (first space 235A). The circumferential seal member 93 has one end E6 in the circumferential direction facing the first space 235A. The one end E6 is located closer to the first flow hole 223 in the circumferential direction than the connection surface between the protruding member 227 and the planetary shaft 221. The other end E7 in the circumferential direction of the circumferential seal member 93 is connected to the protruding member 227, and is fixed to the protruding member 227, for example.

  As shown in FIG. 13, the circumferential seal member 94 covers at least a connection portion between the contact surface between the spacer 234 and the planetary shaft 221 and the inner circumferential surface extending in the radial direction in the spacer groove portion 235. Is provided. One end E6 in the circumferential direction of the circumferential seal member 94 faces the first space 235A and faces the one end E6 of the circumferential seal member 93 with the first space 235A interposed therebetween. The other end E7 in the circumferential direction of the circumferential seal member 94 is connected to an end portion (contact portion 236) in the circumferential direction of the spacer groove portion 235, and is fixed to the end portion, for example.

  At this time, at the one end E6 of the circumferential seal members 93 and 94, the portion located on the outer peripheral side in the radial direction is in line contact or surface contact with the spacer 234, and the portion located on the inner peripheral side is the planetary shaft 221. Line contact or surface contact with Further, portions of the circumferential seal members 93 and 94 located on one and the other side in the axial direction at the one end E6 are in line contact or surface contact with the axial seal member 91.

  The circumferential seal member 93 is slidably connected to the axial seal member 91 as described above. The circumferential seal member 94 may be fixed to the axial seal member 91.

  The material constituting the axial seal members 91 and 92 and the circumferential seal members 93 and 94 may be any material having elasticity and resistance to the first medium, for example, nitrile rubber, hydrogenation, etc. Nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, ethylene propylene rubber, styrene butadiene rubber, natural rubber and other rubber, fluoro resin, polyimide resin, polyamide imide resin, polyether ether ketone resin, polyphenylene sulfide resin, polyamide resin, polyethylene Examples thereof include a resin, a polyacetal resin, a polyethylene terephthalate resin, a polyurethane resin, an epoxy resin, an unsaturated polyester resin, a phenol resin, an ABS resin, or the like, or a material in which the above materials are fiber reinforced, or a material laminated with different materials.

  Referring to FIGS. 15 to 17, for example, one end E6 of the circumferential seal members 93 and 94 is provided wider than the other end E7. The one end E6 is formed with a recess 95 that is recessed toward the other end E7. As described above, the circumferential seal members 93 and 94 are arranged so that the respective ends E6 thereof face the first space 235A. As shown in FIG. 17, the circumferential seal members 93 and 94 have a Y-shaped cross section perpendicular to the circumferential direction. Therefore, the recess 95 of the circumferential seal members 93 and 94 constitutes a part of the first space 235 </ b> A, and the first medium is also supplied into the recess 95. Accordingly, the circumferential seal members 93 and 94 are pressed against the spacer 234, the planetary shaft 221, or the axial seal member 91 by the first medium supplied into the recess 95.

  Next, functions and effects of the seal members 91, 92, 93, 94, the rotary actuator 80, and the bearing device 201 according to the second embodiment will be described.

  Seal members 91, 92, 93 and 94 according to the second embodiment are seal members used for the rotary actuator 80. In the rotary actuator 80, the first connection portion between the spacer groove portion 235 and the contact portion 234A is arranged to extend along the circumferential direction, and the second connection portion between the spacer groove portion 235 and the contact portion 234A. Are arranged so as to extend along the axial direction. The seal members 91, 92, 93, 94 include axial seal members 91, 92 that can cover the first connection portion, and circumferential seal members 93, 94 that can cover the second connection portion. Is provided. The circumferential seal members 93 and 94 have an outer peripheral surface in which a recess 95 is formed. When the circumferential seal members 93 and 94 are arranged so as to cover the second connection portion with the concave portion 95 facing the inside of the spacer groove portion 235, at least one of the outer circumferential surfaces of the circumferential seal members 93 and 94 The sides are provided along the portions of the axial seal members 91 and 92 that are exposed inside the spacer groove 235.

  In this way, the seal members 91, 92, 93, 94 according to the second embodiment can achieve the same effects as the seal members 35, 36, 37 according to the first embodiment.

  When the seal members 91, 92, 93, 94 are arranged so that the circumferential seal members 93, 94 cover the second connection part with the recess 95 facing the inside of the spacer groove part 235, A concave portion 95 is formed in the central portion of the outer peripheral surface portion (one end E6) facing the inside of the groove portion 235.

  The axial seal members 91 and 92 include a first axial seal member 91 and a second axial seal member 92. The first axial seal member 91 is connected to the first portion 911 formed to extend along the depth direction and the circumferential direction of the spacer groove portion 235, and to the first portion 911. And a second portion 912 provided so as to be able to contact at least one of the inner ring 231 as the swinging body or the planetary shaft 221 as the support body. The second axial seal member 92 is provided so as to be in contact with the first portion 911 and the second portion 912 of the first axial seal member 91 and is along the depth direction of the spacer groove portion 235. It is provided so that it can contact the inner peripheral surface extended.

  In this way, the axial seal member 91 is pressed toward the axial seal member 92 in the axial direction by the first medium supplied to the first space 235A. The axial seal member 92 is pressed toward the spacer 234 by the axial seal member 91. At this time, the axial seal member 92 is positioned in the axial direction by a spacer 234 fixed to the planetary shaft 221. Therefore, the axial seal member 92 is elastically deformed so as to protrude in the radial direction when pressed in the axial direction. Therefore, the surface contact or line contact portion between the planetary shaft 221 and the axial seal member 91, between the axial seal member 91 and the axial seal member 92, and between the axial seal member 92 and the spacer 234 is As the axial seal member 92 is elastically deformed, it is pressed in a direction orthogonal to the extending direction of the contact portion. As a result, the axial seal members 91 and 92 can cover the first connection portion between the spacer groove portion 235 and the contact portion 234A. Further, circumferential seal members 93 and 94 are provided so as to cover the second connection portion between the spacer groove portion 235 and the contact portion 234A, respectively. Therefore, the seal members 91, 92, 93, 94 can suppress the leakage of the first medium supplied to the spacer groove 235 in the rotary actuator 80 from the first connection portion and the second connection portion. The swinging efficiency by the rotary actuator 80 can be increased.

  Further, since the concave portion 95 is formed at one end E6 of the circumferential seal members 93 and 94, the circumferential seal members 93 and 94 are pressed from within the concave portion 95 by the first medium supplied to the first space 235A. Will be. Therefore, the above-mentioned portion that is in contact with the spacer 234 and the planetary shaft 221 at one end E6 of the circumferential seal members 93 and 94 is more strongly connected to the spacer 234 and the planetary shaft 221 than in the case where the recess 95 is not formed. Can touch.

<Modification>
The axial seal members 91 and 92 are not limited to the configuration shown in FIGS. 11 and 14. 18-20 is a figure which shows the modification of the axial direction sealing members 91 and 92. As shown in FIG. 18 to 20, only the configuration of the axial seal member and the spacer 234 is shown, and the others are not shown. The spacer 234 and the first space 235A shown in FIGS. 18 to 20 have basically the same configuration as the spacer 234 and the first space 235A shown in FIGS. 11 and 13.

  Referring to FIG. 18, the axial seal member 91 may be configured by two axial seal members 91 </ b> A and 91 </ b> B formed so as to sandwich the axial seal member 92 in the radial direction. Each of the axial seal members 91A and 91B has a portion formed so as to extend along the radial direction and a portion formed so as to extend along the axial direction. The portions formed so as to extend along the radial direction of the axial seal members 91A and 91B are respectively connected to the axial seal member 92 on the side surface on which the portions formed so as to extend along the axial direction are located. It is in surface contact and faces the first space 235A on the side surface opposite to the side surface. The portion formed so as to extend along the radial direction of the axial seal member 91A and the portion formed so as to extend along the radial direction of the axial seal member 91B are provided so as to be continuous in the radial direction. ing. An inner peripheral end of a portion formed so as to extend along the radial direction of the axial seal member 91A and an outer peripheral end of a portion formed so as to extend along the radial direction of the axial seal member 91B are: It arrange | positions so that it may mutually oppose in the position which overlaps with the axial direction sealing member 92 and an axial direction. As for the part formed so that it may extend along the axial direction of the axial direction seal member 91B, an outer peripheral surface is in surface contact with the spacer 234, and an inner peripheral surface is in surface contact with the axial direction seal member 92. In addition, the inner peripheral end of the axial seal member 91A and the outer peripheral end of the axial seal member 91B may be in contact with each other or may be provided so as to be in contact with each other.

  Even in this case, the axial seal members 91A and 91B are pressed toward the axial seal member 92 in the axial direction by the first medium supplied to the first space 235A. As a result, the axial seal member 92 is elastically deformed as described above, and therefore, between the planetary shaft 221 (see FIG. 11) and the axial seal member 91A, and between the axial seal member 91A and the axial seal member 92. The surface contact or line contact portion between the axial seal member 92 and the axial seal member 91B, between the axial seal member 91B and the spacer 234, and between the axial seal member 92 and the spacer 234 is As the axial seal member 92 is elastically deformed, it is pressed in a direction orthogonal to the extending direction of the contact portion. Therefore, each contact part can exhibit high sealing performance.

  Referring to FIG. 19, the axial seal member 91 may be formed as a sharp tip having a sharp outer peripheral end that is formed so as to extend along the radial direction. The portion of the axial seal member 91 formed so as to extend along the radial direction has a side surface facing the first space 235 </ b> A as one plane, and is located on the opposite side to the side surface. The side surface is constituted by two planes extending in a direction intersecting each other. The two planes are a plane provided to form an acute angle with respect to the side surface facing the first space 235A, and a plane provided substantially parallel to the side surface facing the first space 235A. It is. At this time, it is preferable that the axial seal member 92 is provided so as to be in surface contact with the two planes of the axial seal member 91.

  Even in this case, the axial seal member 91 is pressed toward the axial seal member 92 in the axial direction by the first medium supplied to the first space 235A, thereby causing the axial seal member 92 to move in the radial direction. It can be elastically deformed so as to protrude. Accordingly, between the planetary shaft 221 (see FIG. 11) and the axial seal member 91, between the axial seal member 91 and the axial seal member 92, and between the axial seal member 92 and the spacer 234. The surface contact or line contact portion is pressed in a direction orthogonal to the extending direction of the contact portion as the axial seal member 92 is elastically deformed. Therefore, each contact part can exhibit high sealing performance.

  The axial seal members 91 and 92 shown in FIGS. 11, 18, and 19 are provided so as to face each other in the axial direction with the first space 235 </ b> A interposed in the spacer groove 234, but are not limited thereto. It is not a thing. Referring to FIG. 20, the axial seal member 96 may be provided so as to surround the first space 235A together with, for example, the planetary shaft 221 (see FIG. 11). At this time, the axial seal member 96 is preferably formed along the inner peripheral surface of the spacer groove 235 of the spacer 234. In other words, the axial seal member 96 has an inner peripheral surface 97 located on the inner side in the radial direction and the axial direction facing the first space 235A, and an outer peripheral surface 98 positioned on the opposite side of the inner peripheral surface 97. It is preferably in surface contact with the inner peripheral surface of the seat groove 235. The axial direction sealing member 96 has an inner peripheral end in the radial direction in surface contact or line contact with the planetary shaft 221 (see FIG. 11).

  The axial seal member 96 is U-shaped when the cross-sectional shape perpendicular to the circumferential direction of the spacer groove 235 is square, and C-shaped when the semi-circular shape. In this case, the portion located on the outer peripheral side in the radial direction at the one end E6 (see FIG. 13) of the circumferential seal members 93 and 94 (see FIG. 13) is in line contact or surface contact with the axial seal member 96. .

  Even in this case, the axial seal member 96 extends along the contact surface between the spacer 234 and the planetary shaft 221 and the direction (for example, radial direction) intersecting the axial direction at the spacer groove portion 235 (see FIG. 13). If provided so as to cover the connection portion with the inner peripheral surface, the axial seal member 96 prevents the first medium supplied to the first space 235 </ b> A from leaking out from the connection portion. it can. Therefore, the moving part (not shown) can move the other end of the first space 235 </ b> A with a smaller amount of the first medium as compared with the case where the bearing device does not include the axial seal member. As a result, the bearing device 201 including the axial seal member 96 can achieve a longer bearing life more efficiently than a bearing device not including the axial seal member 96.

  The circumferential seal members 36 and 37 and the circumferential seal members 93 and 94 are not limited to the configurations shown in FIGS. 6 to 8 and FIGS. 15 to 17. FIGS. 21 to 26 are views showing modifications of the circumferential seal members 36, 37, 93 and 94. With reference to FIGS. 21 to 23, the circumferential seal members 36, 37, 93, 94 may have a V-shaped cross section perpendicular to the circumferential direction. At this time, the width (thickness) of the portion constituting one end E6 of the circumferential seal members 36, 37, 93, 94 may be approximately the same as the thickness of the portion constituting the other end E7. 24 to 26, the circumferential seal members 36, 37, 93, and 94 are narrower in the width (thickness) of the portion constituting the one end E6 than the thickness of the portion constituting the other end E7. (Thin) may be provided.

  One end E6 and the other end E7 of the circumferential seal members 93 and 94 shown in FIGS. 21 to 26 are connected to one end E6 and the other end E7 of the circumferential seal members 93 and 94 shown in FIGS. Similarly, the circumferential seal members 93 and 94 shown in FIGS. 21 to 26 have the same effects as the circumferential seal members 93 and 94 shown in FIGS. 15 to 17 by being arranged in the bearing device. Can do.

  Further, as described above, the circumferential seal members 93 and 94 shown in FIGS. 24 to 26 face the recess 95, and the thickness of the portion constituting the one end E6 is the thickness of the portion constituting the other end E7. Compared to the case where the thicknesses of both portions are equal, the portions can be easily deformed when pressed from within the recess 95 by the first medium. Therefore, for example, even if the material constituting the circumferential seal members 93 and 94 is a material having a relatively low elastic modulus, one end E6 of the circumferential seal members 93 and 94 is connected to the spacer 234, the planetary shaft 221 and the shaft. It is possible to make strong contact with the direction seal member 91.

  1 to 3 show an example in which the axial seal member 35 and the circumferential seal members 36 and 37 are applied to the bearing device 1 including the rolling bearing 30, but the axial seal member 35 and the circumferential seal described above. The members 36 and 37 can be similarly applied to the bearing device 1 including a sliding bearing. FIG. 10 shows an example in which the axial seal members 91 and 92 and the circumferential seal members 93 and 94 are applied to the bearing device 201 including the rolling bearing 230. The axial seal members 91 and 92 described above and The circumferential seal members 93 and 94 can be similarly applied to the bearing device 201 including a slide bearing.

  Although the embodiment of the present invention has been described as above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is particularly advantageously applied to a bearing device, a mechanical device, and a bearing including a bearing that is difficult to exchange.

  DESCRIPTION OF SYMBOLS 1 Bearing apparatus, 10 Rotating shaft, 20 Housing, 22 Protruding member, 23 1st through-hole, 24 2nd through-hole, 25 Housing groove part, 30, 230 Bearing, 31,231 Inner ring, 32,232 Outer ring, 33 Rolling body, 34 outer ring groove portion, 34A, 235A first space, 34B, 235B second space, 35, 91, 91A, 91B, 92, 96 axial seal member, 36, 37, 93, 94 circumferential seal member, 40 moving portion, 50 frictional force reduction unit, 80 rotary actuator, 100 mechanical device, 200 planetary gear mechanism, 210 sun gear, 211 output shaft, 220 planetary gear, 221 planetary shaft, 222 carrier, 234 spacer, 235 spacer groove.

Claims (7)

An oscillating body that extends in the axial direction and a support that supports the oscillating body so as to be able to oscillate in the circumferential direction. The groove portion is connected to a contact portion between the rocking body and the support body, and is used for a rotary actuator that swings in the circumferential direction in response to the pressure of the medium supplied to the groove portion. A sealing member,
A first connecting portion between the groove and the contact portion is disposed so as to extend along the circumferential direction, and an axial seal member capable of covering the first connecting portion;
A second connecting portion between the groove and the contact portion is disposed so as to extend along the axial direction, and includes a circumferential seal member capable of covering the second connecting portion;
The circumferential seal member has an outer peripheral surface in which a recess is formed,
When the circumferential seal member is disposed so as to cover the second connecting portion with the concave portion facing the inside of the groove portion, at least one side of the outer circumferential surface of the circumferential seal member is the axial direction. A seal member provided along a portion of the seal member that is exposed inside the groove.   When the circumferential seal member is disposed so as to cover the second connecting portion in a state in which the concave portion is directed to the inside of the groove portion, the concave portion is provided at a central portion of the outer peripheral surface portion that is directed to the inner side of the groove portion. The sealing member according to claim 1, wherein the sealing member is formed. The axial seal member includes a first axial seal member and a second axial seal member;
The first axial seal member includes a first portion formed to extend along the depth direction of the groove and the circumferential direction, and is connected to the first portion, and the axial direction. And a second portion formed so as to extend along the circumferential direction, and provided so as to be able to contact at least one of the rocking body or the support body,
The second axial seal member is provided so as to be in contact with the first portion and the second portion of the first axial seal member, and extends along the depth direction of the groove portion. The seal member according to claim 1, wherein the seal member is provided so as to be in contact with the inner peripheral surface. The axial seal member has a U-shaped cross-section perpendicular to the circumferential direction,
The seal member according to claim 1 or 2, wherein the inner circumferential surface of the axial seal member and the outer circumferential surface of the circumferential seal member are formed so as to be in line contact or surface contact.   The seal member according to any one of claims 1 to 4, wherein a material constituting the seal member has elasticity. A seal member according to any one of claims 1 to 5, comprising:
The circumferential seal member is disposed so as to cover the second connecting portion in a state in which the concave portion faces the inside of the groove portion, and at least one side of the outer circumferential surface of the circumferential seal member is formed on the shaft. A rotary actuator that is in line contact or surface contact with a portion of the direction seal member that is exposed inside the groove. A rotary actuator according to claim 6;
Inner ring,
A bearing including an outer ring formed so as to surround the outer periphery of the inner ring,
The rotary actuator and the bearing are arranged so that the circumferential direction overlaps with the circumferential direction of the inner ring and the outer ring,
A portion of the inner ring or the outer ring in the circumferential direction is a load region that receives a radial load when the bearing is stationary,
The rotary actuator is a bearing device that is provided so as to be able to move the load region in the inner ring or the outer ring when the swinging body swings in the circumferential direction with respect to the support.

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