Sealing device, sealing structure, and assembly method of sealing structure

Abstract

To reduce a radial component of a reaction force transmitted from a second seal part to a first seal part during assembly.SOLUTION: A sealing device 640 is assembled between a cylindrical housing 20 and a rotor 30 which is arranged coaxially at the inner side of the housing and rotates around an axis. The sealing device includes: a first seal part 650 having a main part along an outer diameter part 32a of the rotor, the first seal part further having a port part penetrating through the main part in a radial direction, and a groove part 654 which is formed on an outer peripheral surface of the main part so as to enclose the port part when viewed from the outer peripheral surface side in a radial direction and has a pair of inclined surfaces 654b being open to the housing side; and a second seal part 660 which seals a space between the housing and the first seal part 650, the second seal part contacting with the pair of inclined surfaces.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present disclosure relates to a sealing device, a sealing structure, and a method for assembling a sealing structure. [Background technology]

[0002] A rotary valve device is known as a device for switching the flow state of a fluid flowing through multiple flow paths in a single mechanical system. For example, the thermal management system TM for an electric vehicle shown in Figure 1 has four circulation paths CF1, CF2, CF3, and CF4 through which a coolant flows, and a multi-port valve V10 as an example of a rotary valve device. The circulation flow path CF1 is provided around the battery unit BT. The circulation flow path CF2 is provided around the heat exchanger R1 and has a pump P1. The circulation flow path CF3 is provided around the heat exchanger R2 and the capacitor C2 and has a tank RT. The circulation flow path CF4 is provided around the electronic component ED and the axle AX and has a pump P2.

[0003] The multiport valve V10 is provided so that the circulation channels CF1 to CF4 can merge with one another. The multiport valve V10 has a housing V2, a rotor V3, and a sealing device V4. The housing V2 has a plurality of ports V2a connected to the circulation channels CF1 to CF4. The rotor V3 is rotatably disposed inside the housing V2 around the central axis OV. The rotor V3 has a plurality of ports V3a connectable to the ports V2a, and a plurality of flow paths V3b connecting two of the ports V3a. The sealing device V4 seals the gap between the housing V2 and the rotor V3 while allowing the coolant to flow between the port V2a and the port V3a. By rotating the rotor V3, the multiport valve V10 switches the connection state of the circulation channels CF1 to CF4 and the flow state of the coolant flowing through the circulation channels CF1 to CF4. Another circulation channel having an evaporator ER, an accumulator AR, a compressor CP, and a condenser C1 is provided around the heat exchanger R2 and the condenser C2.

[0004] A known structure of a rotary type valve device is that described in JP 2018-96543 A (hereinafter referred to as Patent Document 1), which has a valve body (i.e., a housing) having a valve chamber, a valve element (i.e., a rotor) disposed within the valve chamber and rotating via a valve shaft, and a sealing member disposed between the valve element and the valve body, the sealing member having a cylindrical body (i.e., a first sealing portion) and an outer rib (i.e., a second sealing portion). Summary of the Invention [Problem to be solved by the invention]

[0005] The seal member described in Patent Document 1 has a cylindrical body and an outer rib integrally molded from an elastic material such as synthetic rubber. The outer rib, made of an elastic material, has a solid cross section. When assembled into a valve device, the outer rib generates a reaction force corresponding to the mating force applied from the valve body toward the central axis of the cylindrical body and transmits the reaction force to the cylindrical body. The reaction force generated by the outer rib is an elastic force resulting from the elastic material. The reaction force from the outer rib acts on the cylindrical body in the same direction as the mating force, increasing the axial force from the inner periphery of the cylindrical body. Because the inner periphery of the cylindrical body is in contact with the valve body, an increase in the force from the cylindrical body may deteriorate the sliding properties of the seal member relative to the valve body. Furthermore, an increase in the force from the cylindrical body may deteriorate the assembly of the seal member in the valve device.

[0006] An object of the present disclosure is to reduce the radial component of the reaction force transmitted from the second seal portion to the first seal portion during assembly. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a sealing device that is assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion that is attached to the groove portion so as to contact the groove bottom and seals between the housing and the first seal portion, the second seal portion having a bending portion that can be bent during assembly; and It has. A second aspect of the present disclosure is a sealing device that is assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion that is attached to the groove portion so as to contact the groove bottom and seals between the housing and the first seal portion, the second seal portion having a bending portion that can be bent in a direction intersecting the radial direction during assembly; and It has.

[0008] A third aspect of the present disclosure is a sealing device that is assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion that is attached to the groove portion so as to contact the groove bottom and seals between the housing and the first seal portion, the second seal portion being bendable during assembly; It has. A fourth aspect of the present disclosure is a sealing device that is assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. The sealing device comprises: a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion that is attached to the groove portion so as to contact the groove bottom and seals between the housing and the first seal portion, the second seal portion being bendable in a direction intersecting the radial direction during assembly; It has.

[0009] A fifth aspect of the present disclosure is a sealing structure. The sealing structure comprises: A cylindrical housing; a rotor disposed coaxially inside the housing and rotating about its axis; a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion attached to the groove portion so as to contact the groove bottom and sealing between the housing and the first seal portion in a bent state; It has. A sixth aspect of the present disclosure is a sealing structure. The sealing structure comprises: A cylindrical housing; a rotor disposed coaxially inside the housing and rotating about its axis; a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on an outer peripheral surface of the main body portion, the groove having a groove bottom parallel to the outer peripheral surface and formed to surround the port portion when viewed from the outer peripheral surface side in the radial direction; a first seal portion having a second seal portion that is attached to the groove portion so as to contact the groove bottom and that seals between the housing and the first seal portion while being bent in a direction intersecting the radial direction; It has.

[0010] A seventh aspect of the present disclosure is a sealing device assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. The sealing device comprises: a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed on the outer peripheral surface of the main body so as to surround the port portion when viewed from the outer peripheral surface side in the radial direction, the groove having a pair of inclined surfaces that open toward the housing; a first seal portion having a second seal portion that is attached to the groove portion and seals between the housing and the first seal portion, the second seal portion contacting the pair of inclined surfaces; It has. An eighth aspect of the present disclosure is a sealing device assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis. The sealing device comprises: a first seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove portion formed on the outer peripheral surface of the main body portion so as to surround the port portion when viewed from the outer peripheral surface side in the radial direction, the groove portion having a pair of inclined surfaces that are linearly inclined in a direction intersecting the radial direction in a cross-sectional view, and a groove depth; a first seal portion having a second seal portion that is attached to the groove portion and seals between the housing and the first seal portion, the second seal portion contacting the pair of inclined surfaces; and a first gap is formed between the innermost groove and the second seal portion; The second seal portion is deformable toward the first gap during assembly.

[0011] Another aspect of the present disclosure is that in a sealing device according to any one of the first to fourth, seventh and eighth aspects, the second seal portion may have a hollow circular cross section.

[0012] Another aspect of the present disclosure is that in the sealing device according to any one of the first to fourth, seventh and eighth aspects, the second seal portion may have a C-shaped cross section.

[0013] Another aspect of the present disclosure is that, in a sealing device according to any one of the first to fourth, seventh and eighth aspects, the second seal portion may have a substantially solid circular cross section and an opening formed in the shape of a slit extending from the outer periphery of the cross section of the second seal portion toward the center of the cross section.

[0014] Another aspect of the present disclosure is a sealing device according to any one of the first to fourth, seventh and eighth aspects, wherein the second seal portion includes an outer end portion that contacts the housing, and the housing may contact the outer end portion during assembly by moving relative to the first seal portion from a first axial direction to a second direction opposite to the first direction. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to reduce the radial component of the reaction force transmitted from the second seal portion to the first seal portion during assembly. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of an electric vehicle cooling system with a rotary type valve device. [Figure 2] FIG. 2 is an exploded perspective view of the sealing structure of the first embodiment. [Figure 3] 1 is a longitudinal sectional view of a sealing structure according to a first embodiment. [Figure 4] FIG. 1 is a perspective view of a sealing device according to a first embodiment. [Figure 5] FIG. 2 is an enlarged cross-sectional view of the sealing device of the first embodiment. [Figure 6] 1A is an enlarged cross-sectional view of the second seal portion of the first embodiment, showing only one open end thereof in contact with the edge of the housing; FIG. 1B is an enlarged cross-sectional view of the second seal portion of the first embodiment, showing the other open end thereof in contact with the edge of the housing; and FIG. 1C is an enlarged cross-sectional view of the sealing structure of the first embodiment, showing the completed assembly. [Figure 7] 10A is an enlarged cross-sectional view of the comparative example when the second seal portion is not in contact with the housing, and FIG. 10B is an enlarged cross-sectional view of the comparative example when assembly of the sealing structure is complete. [Figure 8] 4 is a graph showing the relationship between the amount of deformation of the seal portion and the reaction force when the sealing structure of the first embodiment is assembled. [Figure 9]FIG. 6 is an enlarged cross-sectional view of a sealing device according to a second embodiment. [Figure 10] 1A is an enlarged cross-sectional view of the sealing structure of the second embodiment when the housing inserted relatively to the sealing structure begins to contact the folded end of the second seal portion during assembly, FIG. 1B is an enlarged cross-sectional view of the housing inserted relatively further than in FIG. 1A, and FIG. 1C is an enlarged cross-sectional view of the sealing structure of the second embodiment when assembly is completed. [Figure 11] FIG. 10 is an enlarged cross-sectional view of a sealing device according to a third embodiment. [Figure 12] FIG. 10 is an enlarged cross-sectional view of a sealing device according to a fourth embodiment. [Figure 13] FIG. 10 is an enlarged cross-sectional view of a sealing device according to a fifth embodiment. [Figure 14] FIG. 10 is an enlarged cross-sectional view of a sealing device according to a sixth embodiment. [Figure 15] FIG. 11 is an enlarged cross-sectional view of a sealing device according to a seventh embodiment. [Figure 16] FIG. 10 is an enlarged cross-sectional view of a modified example of the sealing device according to the present disclosure. [Figure 17] 10A is an enlarged cross-sectional view of another comparative embodiment in which the second seal portion is not in contact with the housing, and FIG. 10B is an enlarged cross-sectional view of another comparative embodiment in which the assembly of the sealing structure is completed. [Figure 18] FIG. 10 is an enlarged cross-sectional view of a modified example of the sealing device according to the present disclosure. [Figure 19] 1A is an enlarged cross-sectional view of a modified sealing device according to the present disclosure when a second seal portion is not in contact with a housing, and FIG. 1B is an enlarged cross-sectional view of a modified sealing device according to the present disclosure when assembly is complete. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The sealing structure 10 according to the present disclosure is a rotary valve device that switches the flow state of fluids flowing through a plurality of flow paths provided in one mechanical system (not shown).

[0018] (1) First embodiment As shown in FIGS. 2 and 3, the sealing structure 10 of the first embodiment includes a housing 20, a rotor 30, and a sealing device 40.

[0019] The housing 20 has a hollow cylindrical shape extending along a central axis CA. The housing 20 has a plurality of portholes 20p (four in this embodiment) on its cylindrical surface. The plurality of portholes 20p are formed in a row along the circumferential direction. Each porthole 20p penetrates the cylindrical surface in the radial direction. The housing 20 has an inner circumferential surface 20b. The housing 20 has a locking means (not shown). The housing 20 is engageable with a first engagement portion (not shown) provided around the sealing structure 10 in a mechanical system (not shown). By engaging the locking means with the first engagement portion, the housing 20 is fixed relative to the mechanical system.

[0020] The rotor 30 has a generally cylindrical shape and is coaxially disposed inside the housing 20. The rotor 30 is rotatable about a central axis CA. The rotor 30 has a main body portion 32, a protrusion portion 33, and a flow path portion .

[0021] The main body 32 has a cylindrical shape extending along a central axis CA. The main body 32 has an outer diameter portion 32a and a plurality of portholes 30p (two in this embodiment). The portholes 30p are aligned in the circumferential direction on the outer diameter portion 32a. The protruding portion 33 has a cylindrical shape extending along the central axis CA. The protruding portion 33 protrudes from an end surface 32e of the main body portion 32. An opening 36a is formed in the end surface of the protruding portion 33. The flow path section 34 is formed inside the rotor 30. The flow path section 34 has a first flow path 36, a plurality of second flow paths 38, and a junction section 34a. The first flow passage 36 extends axially from the opening 36a of the protrusion 33 into the interior of the main body portion 32. The second flow passages 38 extend radially from each of the portholes 30p in the main body portion 32 into the interior of the main body portion 32. The multiple second flow passages 38 correspond to the multiple portholes 30p. The first flow passage 36 and the multiple second flow passages 38 join at the joining portion 34a. The rotor 30 does not necessarily have to have the first flow passage 36 and the opening 36a. The rotor 30 may be configured such that the plurality of second flow passages 38 are connected to each other.

[0022] When the rotatable rotor 30 is in a predetermined phase, each of the portholes 30p of the rotor 30 faces one of the portholes 20p of the housing 20. At this time, the fluid flowing through the second flow path 38 passes through a port portion 51p of the sealing device 40 (described later) and flows to the porthole 20p of the housing 20 that faces the porthole 30p. The combination of the porthole 30p of the rotor 30 and the porthole 20p of the housing 20 that faces the porthole 30p changes depending on the phase of the rotor 30. That is, by changing the phase of the rotor 30 as the rotor 30 rotates, the combination of the porthole 30p and the porthole 20p changes, thereby switching the flow state of the fluid flowing through the mechanical system.

[0023] The fluid flowing through the sealing structure 10 is a liquid such as oil or long-life coolant (LLC).

[0024] <Sealing device 40> 3, the sealing device 40 is assembled between the housing 20 and the rotor 30. The sealing device 40 has a first seal portion 50 and a second seal portion 60.

[0025] <First seal portion 50> The first seal portion 50 has a substantially cylindrical shape. As shown in Fig. 3, the first seal portion 50 is disposed along the outer diameter portion 32a of the rotor 30 during assembly. The first seal portion 50 has a main body portion 51, a plurality of (four in this embodiment) port portions 51p, and a groove portion 54.

[0026] 4, the main body 51 has a hollow cylindrical shape extending along a central axis CA. The main body 51 has an inner circumferential surface 51a and an outer circumferential surface 51b. The inner circumferential surface 51a of the main body 51 faces the outer diameter portion 32a of the rotor 30 when assembled.

[0027] The main body 51 is formed from a resin material. The main body 51 is preferably formed from a thermoplastic resin material. The main body 51 is more preferably formed from a fluororesin such as polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), or polychlorotrifluoroethylene (PCTFE). The main body 51 may be formed from an elastomer such as synthetic rubber. Note that the material forming the main body 51 is preferably more rigid than the material forming the second seal portion 60, which will be described later. Furthermore, the surface of the main body 51 preferably has a lower coefficient of friction than the surface of the second seal portion 60.

[0028] The main body 51 has a plurality of locking portions 52 and a plurality of locking portions 53. The locking portions 52 protrude in the first axial direction from a part of the edge of the main body 51 in the first axial direction along the central axis CA. The locking portions 53 protrude in the second axial direction from a part of the edge of the main body 51 in the second axial direction on the opposite side of the first axial direction. The multiple locking portions 52, 53 are arranged along the circumferential direction of the main body 51. Each of the locking portions 52, 53 is engageable with a second engaging portion (not shown) provided around the sealing structure 10 in a mechanical system (not shown). The main body 51 is fixed relative to the mechanical system by engaging the locking portions 52, 53 with the second engaging portions.

[0029] Each port portion 51p radially penetrates the main body portion 51. The multiple port portions 51p correspond to the portholes 20p of the housing 20.

[0030] The groove portion 54 is formed concavely with respect to the outer peripheral surface 51b of the main body portion 51. The groove portion 54 has an annular groove 55 and side grooves 56. As shown in FIG. 4, the annular groove 55 and the side grooves 56 are formed to surround each of the multiple port portions 51p when viewed from the outer peripheral surface 51b side in the radial direction. The annular groove 55 goes around the outer peripheral surface 51b in the circumferential direction. A pair of annular grooves 55 sandwiches the multiple port portions 51p in the axial direction of the main body portion 51. The side groove 56 is bridged between the pair of annular grooves 55. The multiple side grooves 56 sandwich each of the multiple port portions 51p in the circumferential direction of the main body portion 51.

[0031] The groove bottoms of the annular groove 55 and the side grooves 56 are along a cylindrical surface parallel to the outer peripheral surface 51b. That is, as shown in Fig. 5, the groove portion 54 has a groove bottom 54a parallel to the outer peripheral surface 51b. The groove portion 54 also has a groove wall 54b extending from the groove bottom 54a to the outer peripheral surface 51b.

[0032] The first seal portion 50 has a function of sealing between the inner circumferential surface 51a of the first seal portion 50 and the outer diameter portion 32a of the rotor 30. Note that the sealing function of the first seal portion 50 preferably acts to prevent foreign matter from entering the area where the inner circumferential surface 51a of the first seal portion 50 and the outer diameter portion 32a of the rotor 30 face each other from outside the area. The sealing function of the first seal portion 50 does not have to act to seal the fluid flowing through the sealed structure 10.

[0033] <Second seal portion 60> As shown in FIG. 4 , the second seal portion 60 is disposed along the groove portion 54 of the first seal portion 50. The second seal portion 60 is a separate body from the first seal portion 50. The second seal portion 60 has an annular portion 67 and a bridging portion 68. The annular portion 67 corresponds to the pair of annular grooves 55 of the groove portion 54. The bridging portion 68 corresponds to the side grooves 56 of the groove portion 54. The bridging portion 68 bridges between the pair of annular portions 67. The second seal portion 60 functions to seal between the first seal portion 50 and the housing 20.

[0034] The second seal portion 60 is made of an elastomer such as synthetic rubber. When the fluid flowing through the sealing structure 10 is LLC, the second seal portion 60 is preferably made of ethylene propylene diene rubber (EDPM).

[0035] The second seal member 60 is made of an elastomer base material having a predetermined cross-sectional shape. Specifically, the second seal member 60 has a shape in which the base material is continuously extended in a direction intersecting the cross section of the base material. That is, each annular portion 67 has a shape in which the cross section of the base material is continuously extended in an annular shape. Furthermore, each bridging portion 68 has a shape in which the cross section of the base material is continuously extended along the central axis CA of the first seal member 50, with the direction intersecting the cross section of the base material aligned with the central axis CA.

[0036] As shown in FIG. 5 , the second seal portion 60 has a V-shaped cross section. The V-shaped cross section of the second seal portion 60 has a thickness. In cross-sectional view, the second seal portion 60 opens toward the housing 20. That is, the second seal portion 60 has an opening 60a. The opening 60a opens toward the housing 20. In cross-sectional view, the second seal portion 60 has two open ends 64 and a folded end 66. The second seal portion 60 also has a bent portion 62.

[0037] The opening 60a extends continuously along the direction in which the cross section of the second seal portion 60 extends. In other words, the opening 60a is aligned with the direction in which the second seal portion 60 extends. The opening 60a is formed in a concave shape with respect to the outer periphery of the second seal portion 60 in cross-sectional view.

[0038] 5, the open end 64 is the end of the opening 60a in a cross-sectional view. The two open ends 64 of the annular portion 67 are aligned with each other along the axial direction of the first seal portion 50. The two open ends 64 of the bridging portion 68 are aligned with each other along the circumferential direction of the first seal portion 50.

[0039] The folded end 66 is the end portion that is folded back in a V shape in cross section. The second seal portion 60 is attached to the first seal portion 50 so that the folded end 66 contacts the groove bottom 54a. At this time, a gap S1 is formed between the second seal portion 60 and the groove wall 54b. In other words, a gap S1 is formed between the bent portion 62 of the second seal portion 60 and the groove portion 54. When the second seal portion 60 is attached to the groove portion 54, the inner circumferential surface 51a of the first seal portion 50 applies a force to the first seal portion 50 in the axial direction against the rotor 30.

[0040] The second seal portion 60 attached to the groove portion 54 has an open end 64 that protrudes radially from the outer peripheral surface 51b of the first seal portion 50. When assembled, the second seal portion 60 attached to the groove portion 54 comes into contact with the housing 20 so that the open end 64 can fit into the inner peripheral surface 20b of the housing 20. The open end 64 is an example of an outer end portion. At this time, the second seal portion 60 is pressed against the groove bottom 54a by the housing 20, thereby sealing between the first seal portion 50 and the housing 20. At this time, when viewed radially, the second seal portion 60 surrounds the port portion 51p of the first seal portion 50 with the annular portion 67 and the bridging portion 68. At this time, the annular portion 67 suppresses axial leakage of the fluid flowing between the port portion 51p of the first seal portion 50 and the porthole 20p of the housing 20. At this time, the bridging portion 68 suppresses leakage of the fluid between adjacent port portions 51p or portholes 20p. At this time, the axial force applied from the first seal portion 50 to the rotor 30 increases as the housing 20 presses the second seal portion 60 against the groove bottom 54a.

[0041] The bent portion 62 is a portion of the second sealed portion 60 that extends from the two open ends 64 toward the folded end 66. In other words, the bent portion 62 is configured to include the open ends 64. The bending portion 62 bends in a direction intersecting the radial direction of the first seal portion 50 when assembled to the housing 20. That is, the bending portion 62 can bend in a direction intersecting the radial direction of the first seal portion 50 when assembled. In other words, the second seal portion 60 can bend in a direction intersecting the radial direction of the first seal portion 50 when assembled. The second seal portion 60 has a space 60b sandwiched between two open ends 64. The space 60b is adjacent to the bent portion 62 in a cross-sectional view. The space 60b is located closer to the center of the cross section than the bent portion 62 in a cross-sectional view. The bending of the bending portion 62 is preferably accompanied by elastic deformation in the axial direction. The bending of the bending portion 62 may also be accompanied by volumetric compression of the elastomer. The configuration of the second seal portion 60 that allows it to bend when assembled to the housing 20 will be described in detail in the assembly method of the sealing structure 10 described later.

[0042] <Assembly method of the sealing structure 10> Next, an example of a method for assembling the sealing structure 10 will be described. First, the first seal portion 50 is assembled to the rotor 30. Then, the second seal portion 60 is fitted into the groove portion 54 of the first seal portion 50 assembled to the rotor 30. In this way, the sealing device 40 is assembled to the rotor 30.

[0043] Thereafter, the housing 20 is assembled to the sealing device 40 by moving the housing 20 from the outside toward the sealing device 40 in the axial direction (see FIG. 6). That is, the sealing device 40 is assembled by moving relatively from the outside toward the inside of the housing 20 in the axial direction.

[0044] As shown in FIG. 6( a), the first opening end 64, which is closer to the housing 20, first comes into contact with the edge of the housing 20. At this time, a moment is applied to the bent portion 62 including the first opening end 64 in the direction of movement of the housing 20 in a cross-sectional view. At this time, a fitting force is applied to the second seal member 60 attached to the groove 54, pressing it from the housing 20 toward the groove bottom 54a. At this time, the bent portion 62 including the first opening end 64 is bent in a direction intersecting the radial direction of the first seal member 50. At this time, the bent portion 62 including the first opening end 64 is bent so as to close the opening 60a.

[0045] 6(b) and 6(c), further relative movement of the housing 20 with respect to the sealing device 40 brings the second opening end 64 into contact with the housing 20. At this time, a further fitting force is applied from the housing 20 toward the groove bottom 54a to the second seal portion 60 attached to the groove portion 54. At this time, the bent portion 62 including the second opening end 64 is bent in a direction intersecting the radial direction of the first seal portion 50.

[0046] Next, the operation and effect of the sealing device 40, the sealing structure 10, and the assembling method of the sealing structure 10 will be described. In this description, a sealing structure 10H as a comparative embodiment to the first embodiment will be described with reference to Fig. 7. In the description of the sealing structure 10H, when parts and the like similar to those in the sealing structure 10 of the first embodiment are used, the reference numerals and names of those parts and the like will be used as they are.

[0047] As shown in FIG. 7, the sealing structure 10H of the comparative embodiment has a sealing device 40H instead of the sealing device 40 of the first embodiment. As shown in FIG. 7, the sealing device 40H has a second seal portion 60H instead of the second seal portion 60. As shown in FIG. 7(a), the second seal portion 60H has a solid circular cross section. That is, the second seal portion 60H of the comparative embodiment does not have an opening 60a, a bending portion 62, or an open end 64. Furthermore, the second seal portion 60H of the comparative embodiment does not have a configuration that allows it to be bent during assembly. The radial protrusion length of the second seal portion 60H attached to the first seal portion 50 from the outer peripheral surface 51b is the same as the protrusion length of the second seal portion 60 of the first embodiment. Otherwise, the sealing structure 10H of the comparative embodiment has the same configuration as the sealing structure 10.

[0048] During assembly, the second seal portion 60H of the comparative example attached to the groove 54 elastically deforms and compresses due to the mating force from the housing 20 toward the groove bottom 54a. At this time, the second seal portion 60H attached to the first seal portion 50 generates a reaction force corresponding to the mating force. The reaction force generated in the second seal portion 60H is an elastic force due to the elastomer. The reaction force (elastic force) of the second seal portion 60H is transmitted to the first seal portion 50 in the radial direction toward the central axis CA, the same as the mating force. When the radial reaction force (elastic force) toward the central axis CA is transmitted to the first seal portion 50, the axial force applied from the first seal portion 50 to the rotor 30 increases. When the force applied from the first seal portion 50 to the rotor 30 increases, the frictional force between the first seal portion 50 and the rotor 30 increases. In this case, the sliding ability of the first seal portion 50 relative to the rotor 30 deteriorates. In this case, the assembly of the sealing structure 10H is also impaired. Furthermore, if the reaction force generated in the second seal portion 60H in response to the fitting force from the housing 20 is large, the frictional force between the second seal portion 60H and the housing 20 increases, which deteriorates the assembly ability of the sealing structure 10H.

[0049] On the other hand, the sealing device 40 has a bending portion 62 that can be bent in a direction intersecting the radial direction of the first seal portion 50 during assembly. That is, the sealing device 40 has a second seal portion 60 that can be bent in a direction intersecting the radial direction of the first seal portion 50 during assembly. In the second seal portion 60 attached to the first seal portion 50, part of the fitting force applied from the housing 20 during assembly is used to bend the bending portion 62. Therefore, the reaction force (elastic force) generated in the second seal portion 60H in response to the fitting force from the housing 20 during assembly of the sealing structure 10 is smaller than that of the sealing structure 10H of the comparative embodiment (see FIG. 8). Therefore, by including the second seal portion 60, the sealing device 40 can reduce the radial component of the reaction force (elastic force) transmitted from the second seal portion 60 to the first seal portion 50 during assembly.

[0050] In the sealing structure 10 having the sealing device 40, the radial component of the reaction force (elastic force) transmitted from the second seal portion 60 to the first seal portion 50 is smaller, so the frictional force between the first seal portion 50 and the rotor 30 is smaller than in the sealing structure 10H. Therefore, the sealing structure 10 can improve the assembly of the sealing structure 10. Furthermore, the sealing structure 10 can improve the slidability of the rotor 30 by reducing the frictional force between the first seal portion 50 and the rotor 30. In other words, when the sealing structure 10 is assembled by assembling the sealing device 40 to the rotor 30 and then assembling the housing 20, deterioration of the slidability of the rotor 30 due to assembly can be suppressed. Furthermore, in the sealing structure 10 having the sealing device 40, the reaction force (elastic force) generated in the second seal portion 60H in response to the fitting force from the housing 20 is smaller, so the frictional force between the second seal portion 60H and the housing 20 is smaller than in the sealing structure 10H. Therefore, the sealing structure 10 can further improve the ease of assembly of the sealing structure 10. That is, in the case where the sealing structure 10 is assembled by assembling the housing 20 after assembling the sealing device 40 to the rotor 30, the ease of assembly of the housing 20 can be improved.

[0051] The bending portion 62 includes an open end 64 that comes into contact with the housing 20 during assembly. Therefore, the bending portion 62 can be bent by a moment that is applied in association with relative movement from the outside to the inside of the housing 20 in the axial direction during assembly. Therefore, when the sealing device 40 is further applied with a fitting force from the housing 20 during assembly, the second seal portion 60 can be bent more easily.

[0052] The second seal portion 60 of the sealing device 40 has an opening 60a. In this case, the section modulus of the second seal portion 60 is small, so the second seal portion 60 is easily bent. Therefore, the second seal portion 60 of the sealing device 40 is easily bent when assembled.

[0053] The bending portion 62 of the sealing device 40 can be bent to close the opening 60a during assembly. Consider the sealing device A40 shown in FIG. 17 as a comparative example of the bending portion 62 that bends to close the opening 60a during assembly. As shown in FIG. 17(a), the sealing device A40 has a second seal portion A60 instead of the second seal portion 60 of the sealing device 40. The second seal portion A60 has a V-shaped cross section that opens toward the axial direction of the first seal portion 50. The second seal portion A60 has an opening A60a and an opening end A64. When the housing 20 is moved and assembled with respect to the second seal portion A60 from the opening A60a side during assembly of the sealing device A40, the opening end A64 on the housing 20 side comes into contact with the housing 20. At this time, the opening end A64 on the housing 20 side deforms along the movement direction of the housing 20, as shown in FIG. 17(b). At this time, the second seal portion A60 deforms to widen the opening A60a. If the second seal portion A60 deforms to widen the opening A60a when assembling the housing 20, there is a risk that the second seal portion A60 will turn inside out toward the opening A60a. If the second seal portion A60 turns inside out toward the opening A60a, there is a risk that the sealing properties of the second seal portion A60 will be impaired. 6, the second seal portion 60 is less likely to turn inside out toward the opening 60a because the bent portion 62 bends to close the opening 60a during assembly. Therefore, the sealing device 40 can prevent the second seal portion 60 from turning inside out during assembly.

[0054] The second seal portion 60 of the sealing device 40 has a V-shaped cross section. In this case, the second seal portion 60 is likely to bend at a portion extending from the opening end 64 to the folded end 66. Therefore, it is easy to identify the portion of the sealing device 40 that will bend during assembly.

[0055] The opening 60a of the second seal portion 60 opens toward the housing 20. That is, two opening ends 64 of the second seal portion 60 come into contact with the housing 20. If the opening of the second seal portion having a V-shaped cross section were to open toward the rotor 30, the second seal portion would come into contact with the housing 20 at one folded end. The sealing performance between the second seal portion and the housing 20 improves as the number of contact points between the second seal portion and the housing 20 increases. Therefore, the sealing device 40 can improve the sealing performance between the second seal portion 60 and the housing 20 compared to when the opening opens toward the rotor 30.

[0056] The second seal portion 60 of the sealing device 40 has open ends 64 that are aligned with each other along the axial direction. If the two open ends are misaligned in the radial direction, the frictional force between one open end and the housing 20 becomes greater than the frictional force between the other open end and the housing 20 depending on the magnitude of the misalignment, resulting in poor assembly of the sealing device. On the other hand, if the two open ends 64 are aligned along the axial direction, the misalignment between the two open ends in the radial direction is small. Therefore, the difference in frictional force between each open end 64 and the housing 20 that occurs during assembly of the sealing device 40 is small. Therefore, the assembly of the sealing device 40 can be improved compared to when the two open ends 64 are misaligned in the radial direction.

[0057] A gap S1 is formed between the groove portion 54 and the bent portion 62 of the sealing device 40. Therefore, when the bent portion 62 is bent in a cross-sectional view, it can bend toward the gap S1. Therefore, the sealing device 40 can bend the second seal portion 60 toward the gap S1 during assembly.

[0058] The second seal portion 60 is adjacent to the bent portion 62 in a cross-sectional view, and has a space 60b provided closer to the center of the cross section than the bent portion 62. Therefore, when the bent portion 62 is bent in a cross-sectional view, it can bend toward the space 60b. Therefore, when the sealing device 40 is assembled, the second seal portion 60 can be bent toward the space 60b.

[0059] The sealing structure 10 may be assembled by assembling the sealing device 40 to the housing 20 and then assembling the rotor 30 to the inner circumferential surface 51 a of the sealing device 40. In this case, the radial component of the reaction force (elastic force) transmitted from the second seal portion 60 to the first seal portion 50 is small, so the increase in axial force by the first seal portion 50 accompanying the assembling of the housing 20 is smaller than in the sealing structure 10H of the comparative embodiment. That is, in this case, the frictional force between the first seal portion 50 and the rotor 30 generated during the assembling of the rotor 30 is smaller than in the sealing structure 10H of the comparative embodiment. Therefore, when the sealing structure 10 is assembled by assembling the sealing device 40 to the housing 20 and then assembling the rotor 30 to the inner circumferential surface 51 a of the sealing device 40, the assembling of the rotor 30 can be improved.

[0060] (2) Second embodiment Next, a sealing structure 210 according to a second embodiment will be described with reference to the drawings. In this description, when parts similar to those used in the above-described embodiment are used, the reference numerals and names of those parts will be used as they are. In the following description, duplicated descriptions of the same configuration as in the above-described embodiment will be omitted.

[0061] As shown in FIG. 9, the sealing structure 210 has a sealing device 240 instead of the sealing device 40 in the first embodiment. The sealing device 240 has a second seal portion 260 instead of the second seal portion 60 in the first embodiment.

[0062] <Second seal portion 260> As shown in FIG. 9 , the second seal portion 260 has a V-shaped cross section. The V-shaped cross section of the second seal portion 260 has a certain thickness. The cross section of the second seal portion 260 opens toward the rotor 30. That is, the second seal portion 260 has an opening 260a. The opening 260a opens toward the rotor 30. In a cross-sectional view, the second seal portion 260 has two open ends 264 and a folded end 266. The second seal portion 260 also has a bent portion 262.

[0063] The second seal portion 260 is attached to the first seal portion 50 so that the two open ends 264 contact the groove bottom 54a of the groove portion 54. At this time, a gap S2 is formed between the second seal portion 260 and the groove wall 54b. In other words, a gap S2 is formed between the bent portion 262 and the groove portion 54.

[0064] The second seal portion 260, which is attached to the groove portion 54, has a folded end 266 that contacts the housing 20. The folded end 266 is an example of an outer end portion. The bent portion 262 is configured to include the folded end 266. The second seal portion 260 has a space 260b sandwiched between two open ends 264. The space 260b is adjacent to the bent portion 262 in a cross-sectional view. The space 260b is located closer to the center of the cross section than the bent portion 262 in a cross-sectional view.

[0065] <Method of assembling the sealing structure 210> Next, an example of a method for assembling the sealing structure 210 will be described.

[0066] First, the first seal portion 50 is assembled to the rotor 30. Thereafter, the second seal portion 260 is fitted into the groove portion 54 of the first seal portion 50 assembled to the rotor 30. In other words, the sealing device 240 is assembled to the rotor 30. Thereafter, the housing 20 is assembled to the sealing device 240 by moving the housing 20 relatively from the outside in the axial direction toward the sealing device 240 (see FIG. 10).

[0067] 10(a), first, the folded end 266 comes into contact with the edge of the housing 20. At this time, a moment is applied to the bent portion 262 including the folded end 266 in the direction of movement of the housing 20 in a cross-sectional view. At this time, a fitting force is applied to the second seal portion 260 attached to the groove portion 54 from the housing 20 toward the groove bottom 54a. At this time, the first bent portion 262, which is on the housing 20 side of the second seal portion 260 in the axial direction, is bent.

[0068] 10(b) and 10(c), further relative movement of the housing 20 with respect to the sealing device 240 further increases the mating force applied to the second seal portion 260. At this time, the bent portion 262 on the opposite side of the opening 260a from the first bent portion 262 is bent. Other than the above, the sealing structure 210 has the same configuration as the sealing structure 10.

[0069] Next, the operation and effects of the second embodiment will be described. The opening 260a of the second seal portion 260 opens toward the rotor 30. That is, in the second seal portion 260, one folded end 266 comes into contact with the housing 20. Therefore, the frictional force generated between the second seal portion 260 and the housing 20 during assembly is smaller than when the opening opens toward the housing 20. Therefore, the sealing device 240 can be assembled more easily than when the opening opens toward the housing 20.

[0070] (3) Third embodiment Next, a sealing structure 310 according to a third embodiment will be described with reference to the drawings. In this description, when parts similar to those used in the above-described embodiment are used, the reference numerals and names of those parts will be used as they are. In the following description, duplicated descriptions of the same configuration as in the above-described embodiment will be omitted.

[0071] As shown in FIG. 11, the sealing structure 310 has a sealing device 340 instead of the sealing device 40 in the first embodiment. The sealing device 340 has a second seal portion 360 instead of the second seal portion 60 in the first embodiment.

[0072] <Second seal portion 360> As shown in FIG. 11 , the second seal portion 360 has a hollow annular cross section. The annular cross section of the second seal portion 360 has a thickness. The second seal portion 360 has an outer edge. The second seal portion 360 also has a bent portion 362. Note that the second seal portion 360 does not have an opening in cross section. The second seal portion 360 has a space 360b inside the annular cross section. The space 360b is adjacent to the bent portion 362 in cross section. The space 360b is located closer to the center of the cross section than the bent portion 362 in cross section. Other than the above, the sealing structure 310 has the same configuration as the sealing structure 10.

[0073] The sealing structure 310 and the sealing device 340 have the same effects as the sealing structure 10 and the sealing device 40, except for the effects resulting from the openings.

[0074] (4) Fourth embodiment Next, a sealing structure 410 according to a fourth embodiment will be described with reference to the drawings. In this description, when parts similar to those used in the above-described embodiment are used, the reference numerals and names of those parts will be used as they are. In the following description, duplicated descriptions of the same configurations as those in the above-described embodiment will be omitted.

[0075] As shown in FIG. 12, the sealing structure 410 has a sealing device 440 instead of the sealing device 40 in the first embodiment. The sealing device 440 has a second seal portion 460 instead of the second seal portion 60 in the first embodiment.

[0076] <Second seal portion 460> As shown in FIG. 12 , the second seal portion 460 has a C-shaped cross section. The C-shaped cross section of the second seal portion 460 has a thickness. The second seal portion 460 has an opening 460a. The opening 460a opens toward the groove wall 54b in a cross-sectional view. The second seal portion 460 has two open ends 464 in a cross-sectional view. The second seal portion 460 also has a bent portion 462. The second seal portion 460 has an outer edge. The second seal portion 460 has a space 460b inside the C-shaped cross section. The space 460b is adjacent to the bent portion 462 in a cross-sectional view. The space 460b is located closer to the center of the cross section than the bent portion 462 in a cross-sectional view. Other than the above, the sealing structure 410 has the same configuration as the sealing structure 10.

[0077] The sealing structure 410 and the sealing device 440 have the same effects as the sealing structure 210 and the sealing device 240 .

[0078] (5) Fifth embodiment Next, a sealing structure 510 according to a fifth embodiment will be described with reference to the drawings. In this description, when parts similar to those used in the above-described embodiments are used, the reference numerals and names of those parts will be used as they are. In the following description, duplicated descriptions of the same configurations as those in the above-described embodiments will be omitted.

[0079] As shown in FIG. 13, the sealing structure 510 has a sealing device 540 instead of the sealing device 40 in the first embodiment. The sealing device 540 has a second seal portion 560 instead of the second seal portion 60 in the first embodiment.

[0080] <Second seal portion 560> As shown in FIG. 13 , the second seal portion 560 has a substantially solid circular cross section. The second seal portion 560 has an opening 560a formed in a concave shape relative to the outer periphery of the second seal portion 560 in a cross-sectional view. The opening 560a is formed in a slit shape extending from the outer periphery of the cross section of the second seal portion 560 toward the center of the cross section. The opening 560a opens toward the groove wall 54b in a cross-sectional view. The second seal portion 560 has two opening ends 564 in a cross-sectional view. The second seal portion 560 also has a bent portion 562. The bent portion 562 includes a point where the distance between the innermost portion of the opening 560a and the outer periphery of the second seal portion 560 is shortest in a cross-sectional view. The second seal portion 560 has an outer edge. Other than the above, the sealing structure 510 has the same configuration as the sealing structure 10.

[0081] The sealing structure 510 and the sealing device 540 have the same effects as the sealing structure 210 and the sealing device 240 .

[0082] (6) Sixth embodiment Next, a sealing structure 610 according to a sixth embodiment of the present disclosure will be described with reference to the drawings. In this description, when components similar to those used in the above-described embodiments are used, the reference numerals and names of those components will be used as they are. In the following description, duplicated descriptions of the same configurations as those in the above-described embodiments will be omitted.

[0083] As shown in FIG. 14, the sealing structure 610 has a sealing device 640 instead of the sealing device 40 in the first embodiment. The sealing device 640 includes a first seal portion 650 and a second seal portion 660 .

[0084] <First seal portion 650> The first seal portion 650 has a groove 654 instead of the groove 54 in the first embodiment. As shown in FIG. 14 , the groove 654 is formed in a V-shape in cross section. The groove 654 has a rear end 654a and a pair of inclined surfaces 654b. The rear end 654a is the end on the side that is bent into a V-shape in cross section. The pair of inclined surfaces 654b open toward the housing 20. Each inclined surface 654b is linearly inclined in a direction intersecting the radial direction in cross section. The pair of inclined surfaces 654b are symmetrical in the radial direction of the first seal portion 650.

[0085] <Second seal portion 660> As shown in Fig. 14, the second seal portion 660 has a substantially solid circular cross section. That is, the second seal portion 660 does not have an opening, a bent portion, or an open end. Furthermore, the second seal portion 660 does not have a configuration that allows it to be bent during assembly. The second seal portion 660 is attached to the first seal portion 650 while contacting the pair of inclined surfaces 654b of the groove portion 654. When the second seal portion 660 is attached to the first seal portion 650 and is not assembled to the housing 20, a gap S6 is formed between the second seal portion 660 and the inner end portion 654a. Other than the above, the sealing structure 610 has the same configuration as the sealing structure 10.

[0086] The second seal portion 660 attached to the first seal portion 650 generates a reaction force (elastic force) corresponding to the mating force applied from the housing 20 during assembly. At this time, the second seal portion 660 contacts the pair of inclined surfaces 654b. Therefore, the reaction force (elastic force) generated in the second seal portion 660 acts on the first seal portion 650 via the groove portion 654 in a direction opposite to the normal direction of each of the pair of inclined surfaces 654b. As a result, the radial component of the reaction force (elastic force) transmitted from the second seal portion 660 to the first seal portion 650 during assembly of the sealing structure 610 is smaller than that of the sealing structure 10H of the comparative embodiment. Therefore, by including the groove portion 654, the sealing device 640 can reduce the radial component of the reaction force (elastic force) transmitted from the second seal portion 660 to the first seal portion 650 during assembly.

[0087] Furthermore, the sealing structure 610 including the sealing device 640 can achieve the same effects as the sealing structure 10.

[0088] When not assembled, a gap S6 is formed between the inner end portion 654a and the second seal portion 660. At this time, when the second seal portion 660 is pressed by the housing 20 during assembly, the second seal portion 660 deforms toward the gap S6 while exhibiting behavior typical of elastomers so as to reduce the area of ​​the gap S6 compared to when the second seal portion 660 is not pressed by the housing 20. That is, the second seal portion 660 is deformable toward the gap S6 during assembly. In this manner, in the second seal portion 60 attached to the first seal portion 650, part of the fitting force applied by the housing 20 during assembly is used to deform the second seal portion 60 toward the gap S6. Therefore, by providing the gap S6, the sealing device 640 can reduce the reaction force (elastic force) generated in the second seal portion 60 when pressed by the housing 20 during assembly.

[0089] The pair of inclined surfaces 654b are symmetrical in the radial direction of the first seal portion 650. In this case, forces generated between the pair of inclined surfaces 654b and the second seal portion 660 during assembly cancel each other out in the axial direction. Therefore, the second seal portion 660 is less likely to shift axially from the groove portion 654 during assembly. Therefore, the sealing device 640 can be easily assembled.

[0090] (6) Seventh embodiment Next, a sealing structure 710 according to a seventh embodiment of the present disclosure will be described with reference to the drawings. In this description, when parts similar to those used in the above-described embodiments are used, the reference numerals and names of those parts will be used as they are. In the following description, duplicated descriptions of the same configurations as those in the above-described embodiments will be omitted.

[0091] As shown in FIG. 15, the sealing structure 710 has a sealing device 740 instead of the sealing device 40 in the first embodiment. The sealing device 740 has a first seal portion 750 instead of the first seal portion 50 in the first embodiment. The sealing device 740 also has the second seal portion 60 in the first embodiment. That is, the second seal portion 60 of the sealing device 740 has a bending portion 62 that can be bent during assembly. The second seal portion 60 of the sealing device 740 also has a folded end 66. The sealing device 740 may have any of the second seal portions 260 , 360 , 460 , and 560 instead of the second seal portion 60 .

[0092] <First seal portion 750> The first seal portion 750 has a groove portion 754 instead of the groove portion 54 in the first embodiment. The groove portion 754 is similar to the groove portion 654 in the sixth embodiment. That is, as shown in FIG. 15 , the groove portion 754 is formed in a V-shape in cross section. The groove portion 754 has a deep end portion 754a and a pair of inclined surfaces 754b. The pair of inclined surfaces 754b are open toward the housing 20. Each inclined surface 754b is linearly inclined in a direction intersecting the radial direction in cross section. The pair of inclined surfaces 754b are symmetrical in the radial direction of the first seal portion 750. The second seal portion 60 is attached to the first seal portion 750 while contacting the pair of inclined surfaces 754 b of the groove portion 754 .

[0093] The second seal portion 60 is attached to the first seal portion 750 so that the folded end 66 contacts the pair of inclined surfaces 754b. At this time, a gap S7 is formed between the bent portion 62 and the pair of inclined surfaces 754b.

[0094] When the second seal portion 60 is attached to the first seal portion 750 and is not assembled to the housing 20, a gap S7a is formed between the innermost end portion 754a and the second seal portion 760. In other words, when not assembled, a gap S7a is formed between the innermost end portion 754a and the second seal portion 760. Other than the above, the sealing structure 610 has the same configuration as the sealing structure 10.

[0095] The second seal portion 60 of the sealing device 740 has a bending portion 62 that can be bent during assembly, so that the sealing device 740 can reduce the amount of deformation of the first seal portion 750 during assembly.

[0096] A gap S7 is formed between the groove portion 754 and the bent portion 62 of the sealing device 740. Therefore, the bent portion 62 can bend toward the gap S7. Therefore, in the sealing device 740, when the second seal portion 60 is attached to the groove portion 754 having the pair of inclined surfaces 754b, the second seal portion 60 can be bent toward the gap S7 during assembly.

[0097] As described above, the embodiments of the present disclosure have been described, but the present disclosure is not limited to the above embodiments, and various modifications, changes, and improvements are possible within the scope of the technical idea of ​​the present disclosure.

[0098] For example, the opening of the second seal portion is configured to open in a direction along the radial or axial direction of the first seal portion, as shown in Figures 5, 6, 9, 10, 12, 13, and 15. However, the opening of the second seal portion according to the present disclosure may be configured to open in a direction inclined relative to the radial and / or axial direction of the first seal portion.

[0099] The grooves 654, 754 in the sixth and seventh embodiments are V-shaped in cross section. However, the grooves having a pair of inclined surfaces according to the present disclosure may further have a groove bottom sandwiched between the pair of inclined surfaces and parallel to the outer peripheral surface of the first seal portion.

[0100] The first seal portion 50 of the first embodiment extends from the cylindrical outer peripheral surface 51b to the groove wall 54b. However, the first seal portion 50 may have a protrusion 57 around the groove portion 54, as shown in Fig. 16. The protrusion 57 is formed in a rib shape that follows the groove portion 54. In other words, the first seal portion according to the present disclosure may have a rib-shaped protrusion around the groove portion.

[0101] The second seal portion 60 in the first embodiment is bent to close the opening 60a. However, the second seal portion of the sealing device according to the present disclosure may be bent to open the opening. Specifically, the sealing device according to the present disclosure may be, for example, the sealing device A40 described above (see FIG. 17). The second seal portion according to the present disclosure may be a second seal portion 860 having a spiral cross-sectional shape, as shown in Fig. 18. The second seal portion 860 has a buckling portion 862, a space 860a, and an opening 860b. The second seal portion 60 of the first embodiment may be configured so that the opening edge 64 is bent toward the space 60b, as shown in FIG. 19(b). Specifically, the second seal portion 60 may have a notch 69 in a portion of the space 60b side extending from the folded end 66 to the opening edge 64 in a cross-sectional view, as shown in FIG. 19(a). The second seal portion 60 may have a fold line instead of the notch 69. The notch 69 or fold line preferably extends along the extension direction of the cross section of the second seal portion 60. The notch 69 or fold line may also extend linearly so as to intersect with the extension direction of the cross section of the second seal portion 60. [Explanation of symbols]

[0102] CA: Central axis 10: Sealed structure 20: Housing 20b: Inner peripheral surface 30: Rotor 40: Sealing device 50: First seal part 51: Main body 51p: Port section 51b: Outer surface 51a: Inner surface 54: Groove 54a: Groove bottom 60: Second seal part 60a: Opening 62: Bend 64: Open end S1: Gap 210: Sealed structure 240: Sealing device 260: Second seal part 260a: opening 262: Bend 264: Open end S2: Gap 310: Sealed structure 340: Sealing device 360: Second seal 362: Bend 410: Sealed structure 440: Sealing device 460: Second seal part 460a: opening 462: Bend 464: Open end 510: Sealed structure 540: Sealing device 560: Second seal part 560a: opening 562: Bend 564: Open end 610: Sealed structure 640: Sealing device 650: First seal part 654: Groove 654a: Mizooku 654b: Inclined surface 660: Second seal part S6: Gap 710: Sealed structure 740: Sealing device 760: Second seal part 760a: opening 762: Bend 764: Open end S7: Gap S7a: Gap

Claims

1. A sealing device assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis, a second seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove formed in the outer peripheral surface of the main body so as to surround the port portion when viewed from the outer peripheral surface side in the radial direction, the groove having a pair of inclined surfaces that open toward the housing; a second seal portion having a second seal portion that is attached to the groove portion and seals between the housing and the second seal portion, the second seal portion contacting the pair of inclined surfaces; A sealing device having:

2. The groove portion has a groove depth, a first gap is formed between the innermost portion of the groove and the second seal portion; The sealing device according to claim 1 , wherein the second seal portion is deformable toward the first gap during assembly.

3. The sealing device of claim 2 , wherein the second seal portion is formed from an elastomer.

4. The sealing device according to claim 1 or 2, wherein the pair of inclined surfaces are symmetrical in a radial direction of the second seal portion.

5. The sealing device according to any one of claims 1 to 3, wherein the second seal portion has a buckling portion that can buckle during assembly.

6. The sealing device according to claim 5 , wherein a second gap is formed between the pair of inclined surfaces and the buckling portion.

7. A sealing device assembled between a cylindrical housing and a rotor that is coaxially arranged inside the housing and rotates around an axis, a second seal portion having a main body portion along an outer diameter portion of the rotor, a port portion that radially penetrates the main body portion; a groove portion formed on the outer peripheral surface of the main body portion so as to surround the port portion when viewed from the outer peripheral surface side in the radial direction, the groove portion having a pair of inclined surfaces that are linearly inclined in a direction intersecting the radial direction in a cross-sectional view, and a groove depth; a second seal portion having a second seal portion attached to the groove portion and sealing between the housing and the first seal portion, the second seal portion contacting the pair of inclined surfaces; and a first gap is formed between the innermost groove and the second seal portion; the second seal portion is deformable toward the first gap during assembly; Sealing device.

8. A cylindrical housing; a rotor disposed coaxially inside the housing and rotating about its axis; The sealing device according to any one of claims 1 to 7, A sealed structure having

9. The sealing device according to any one of claims 1 to 7 is assembled into a cylindrical housing, a rotor is attached to an inner circumferential surface of the sealing device attached to the housing, the inner circumferential surface being opposite to the outer circumferential surface of the sealing device; How to assemble the sealed structure.

10. The sealing device according to any one of claims 1 to 7 is assembled to a rotor, a cylindrical housing is assembled to the sealing device assembled to the rotor; How to assemble the sealed structure.

Images