JP2019219500A - Rotation device - Google Patents

Abstract

To provide a technique capable of sufficiently fixing a rotary unit which is mounted in a hub of a motor.SOLUTION: In a rotation device 1, a hub 40 comprises a disc part 42 extending radially outside of a shaft 30 (at an outer peripheral side (in an arrow (d) direction). The disc part 42 includes a peripheral groove (an outer peripheral side peripheral groove 45) which is opened at one side (at an upper side (in an arrow (a) direction). An exterior inner wall surface 45x of the outer peripheral side peripheral groove 45 extends while being inclined radially outsides (at the outer peripheral side (in the arrow (d) direction) from one side (the upper side (in the arrow (a) direction) to the other side (in an arrow (b) direction). A flange part 14 of a cylindrical part 13 included in a rotary unit 10 is accommodated within the outer peripheral side peripheral groove 45. Inside of the outer peripheral side peripheral groove 45, the flange part 14 is covered by a cured adhesive AD.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotation device, and more particularly, to a rotation device including a rotation unit (for example, an optical unit) rotated by a motor.

  Conventionally, a scanner device for position recognition has been used in virtual reality (VR). Such a scanner device has, for example, a rotating device that rotates an optical unit mounted on a hub of a motor. In this type of conventional rotation device, the lower surface of the optical unit is fixed to the upper surface of the hub using an adhesive (for example, see Patent Document 1).

JP 2017-198965 A

  In such a conventional rotating device, since high dimensional accuracy and strength are required for the frame of the optical unit, a high-performance resin (for example, engineering plastic (engineering plastic) or special engineering plastic (super engineering plastic)) is used as a material for the frame. )) Is used. However, many high-performance resins such as engineering plastics and super engineering plastics have poor adhesion to an adhesive, and the frame of the optical unit may not be sufficiently fixed to the motor hub. In addition, since the optical unit is equipped with a delicate and heat-sensitive optical component, an adhesive that is hardened by heat cannot be used, and the adhesive that fixes the optical unit frame to the motor hub is significantly limited. .

  An object of the present invention is to provide a technique capable of sufficiently fixing a rotating unit mounted on a hub of a motor.

  A rotation device according to one aspect of the present invention includes a motor, and a rotation unit rotated by the motor, wherein the motor is fixed to a rotatably supported shaft and one end of the shaft. The rotary unit has a cylindrical portion coupled to the hub, wherein the cylindrical portion extends radially outward from an outer peripheral surface of the cylindrical portion, or an outer periphery of the cylindrical portion. A groove recessed radially inward from a surface, the hub having a disk portion extending radially outward of the shaft, the disk portion having a circumferential groove opening on one side; The outer inner wall surface of the groove extends obliquely outward in the radial direction as going from one side to the other side, and the flange portion or the groove portion of the cylindrical portion is housed in the circumferential groove, and in the circumferential groove, The furan by the cured adhesive Characterized in that part or the groove is covered.

  ADVANTAGE OF THE INVENTION According to the rotating device concerning this invention, the rotating unit mounted in the hub of a motor can be fixed sufficiently.

It is a sectional view showing roughly composition of a rotation device concerning an embodiment of the invention. FIG. 2 is a partially enlarged cross-sectional view schematically showing a configuration of a flange portion and an outer circumferential groove in the rotating device shown in FIG. 1. FIG. 6 is a partially enlarged cross-sectional view schematically illustrating a configuration of a modification of the rotating device illustrated in FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view schematically showing a configuration of a rotating device 1 according to an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view schematically showing the configuration of the flange portion 14 and the outer circumferential groove 45 in the rotating device 1 shown in FIG. Hereinafter, for convenience of explanation, one of the directions (the direction of the arrow a) in the direction of the axis Y1 of the rotating device 1 in FIG. 1 (hereinafter also referred to as the axial direction) is defined as the upper side, and the other (the direction of the arrow b) is defined as the lower side. In addition, one of the radial directions extending in a direction perpendicular to the axis Y1 of the rotating device 1 in FIG. In the following description, when the positional relationship and direction of each member are described using up and down, the positional relationship and direction in the drawings are shown, but not the positional relationship and direction when incorporated in an actual device. .

  The rotating device 1 according to the embodiment of the present invention includes a motor 20 and a rotating unit 10 rotated by the motor 20. The motor 20 includes a shaft 30 rotatably supported, and a hub 40 fixed to an end (upper end 30u) of one side (upper direction (arrow a direction)) of the shaft 30. The rotation unit 10 has a cylindrical portion 13 connected to the hub 40. The cylindrical portion 13 has a flange portion 14 extending radially outward (outer peripheral side (arrow d direction)) from the outer peripheral surface 13x of the cylindrical portion 13.

  The hub 40 has a disk part 42 extending radially outward (outer peripheral side (direction of arrow d)) of the shaft 30. The disk portion 42 has a circumferential groove (outer circumferential groove 45) that opens on one side (upward (in the direction of arrow a)). The outer inner wall surface 45x of the outer circumferential groove 45 is inclined in a radially outward direction (outer circumferential direction (arrow d direction)) from one side (upper direction (arrow a direction)) toward the other side (arrow b direction). are doing. The flange portion 14 of the cylindrical portion 13 in the frame 11 of the rotating unit 10 is accommodated in an outer circumferential groove 45. In the outer circumferential groove 45, the flange portion 14 is covered with the cured adhesive AD. Hereinafter, the configuration of the rotating device 1 will be specifically described.

  In the rotating device 1, the motor 20 includes a base 21 which also serves as a part of the housing of the rotating device 1, as shown in FIG. A boss 22 protruding upward (in the direction of arrow a) is formed at the bottom of the base 21. A stator 23 formed by winding a coil 25 around a stator core 24 is fixed to an outer peripheral portion of the boss portion 22.

  A fluid dynamic bearing device 50 is fitted to the inner peripheral surface of the boss portion 22, and the rotor 26 is supported by the fluid dynamic bearing device 50 so as to be rotatable relative to the stator 23. . The rotor 26 is fitted on the cylindrical inner peripheral surface of the hub 40 via the yoke 27 and the hub 40 fitted on the upper end 30u which is the upper end (the direction of arrow a) of the shaft 30. And a rotor magnet 28 that generates a rotating magnetic field in cooperation with the stator 23.

  When the fluid dynamic bearing device 50 is fitted to the inner peripheral surface of the boss portion 22, it is desirable to use a thermosetting or anaerobic adhesive to prevent a gap from being generated. Further, the motor 20 is configured as an outer rotor type motor, but is not limited to this, and may be configured as an inner rotor type motor.

  A flexible wiring board 29 is fixed to the lower surface, which is the lower surface (the direction of the arrow b), of the base 21. When a control current is supplied from the output end of the flexible wiring board 29 to the stator 23, the rotor assembly including the hub 40, the rotor magnet 28, the shaft 30, and the like rotates with respect to the stator 23.

  The fluid dynamic bearing device 50 rotatably supports the shaft 30 on which the thrust plate 51 is fitted downward (in the direction of arrow b). The fluid dynamic bearing device 50 includes a cylindrical case 52 having a cylindrical inner peripheral surface 52i, and a disk-shaped member that closes a lower end that is a lower end (in the direction of the arrow b) of the case 52. An end plate 53, a cylindrical bearing member 54 fitted into the case 52, and the shaft 30 with the thrust plate 51 are provided. In the shaft 30 with the thrust plate 51, the thrust plate 51 is sandwiched between a lower surface 54 b that is a lower surface (in the direction of arrow b) of the bearing member 54 and an upper surface 53 u that is an upper surface (in the direction of arrow a) of the end plate 53. Thus, it is inserted into the bearing member 54. Note that the case 52 and the bearing member 54 are not limited to being separate bodies, and may be integrated.

  On the inner peripheral surface 54i of the bearing member 54, there are formed dynamic pressure bearing surfaces 54ia and 54ib for generating a dynamic pressure receiving a radial load between the inner peripheral surface 54i and the outer peripheral surface 30x of the shaft 30 with the thrust plate 51. ing. Also, on the lower surface 54b of the bearing member 54, a dynamic pressure is generated to receive a load in the axial direction (arrow ab direction) between the upper surface 51u which is the upper surface (arrow a direction) of the opposed thrust plate 51. The dynamic pressure bearing surface 54ba is formed. The present invention is not limited to this, and the dynamic pressure bearing surface may be formed on the upper surface 51u of the thrust plate 51.

  Further, a dynamic pressure is generated on the upper surface 53u of the end plate 53 between the thrust plate 51 and the lower surface 51b which is the lower surface (the direction of the arrow b) of the thrust plate 51 in the axial direction (the direction of the arrow ab). Pressure bearing surface 53ua is formed. The present invention is not limited to this, and the dynamic bearing surface may be formed on the lower surface 51b of the thrust plate.

 In these dynamic pressure bearing surfaces 54ia, 54ib, 54ba and 53ua, a dynamic pressure groove is formed in a herringbone shape, but is not necessarily limited to this shape, and a dynamic pressure groove is formed in a spiral shape, an arc shape, a linear shape, or the like. May be done. In addition, a lubricating oil is filled in minute gaps between the opposing surfaces of the dynamic pressure bearing surfaces 54ia, 54ib, 54ba, and 53ua.

  In the motor 20, the hub 40 is a cup-shaped (bottomed cylindrical) member as shown in FIG. 1, and can accommodate the stator 23 from the lower side (arrow b direction) to the upper side (arrow a direction). An accommodating concave portion 41 which is a concave portion having a predetermined depth is formed. The hub 40 has a cylindrical portion 43 which is a cylindrical portion extending in the axial direction (arrow ab direction), and extends inward from the upper end (arrow a direction) of the cylindrical portion 43 (arrow c direction). And a disk portion 42 which is a disk-shaped portion present.

  The disk part 42 and the cylindrical part 43 are disposed coaxially, and have the axis Y1 as the center axis. The disk part 42 and the cylindrical part 43 are formed integrally. The disk part 42 and the cylindrical part 43 are formed of, for example, an aluminum alloy or the like. In addition, the disk part 42 and the cylindrical part 43 may be separate bodies, and may be formed of another material.

  At the center of the disk portion 42, the disk portion 42 is placed between the lower surface (the lower surface (inner bottom surface) 42b) and the upper surface (the direction of the arrow a) (upper surface 42u). A penetrating through-hole 42c is formed. The shaft 30 is fitted into the through hole 42c. The disk portion 42 and the shaft 30 are coaxially arranged, and have the axis Y1 as a central axis. The outer peripheral surface 30x of the shaft 30 is fixed to the through hole 42c.

  The disk portion 42 has an inner circumferential groove 44 and an outer circumferential groove 45 that open upward (in the direction of arrow a). That is, the inner circumferential groove 44 and the outer circumferential groove 45 are recessed downward (in the direction of arrow b) on the upper surface 42u of the disk portion 42. The inner circumferential groove 44 and the outer circumferential groove 45 extend annularly around the axis Y1. The inner circumferential groove 44 is formed outside the through hole 42c (in the direction of arrow d), and is formed more inward than the outer circumferential groove 45 (in the direction of arrow c). The inner circumferential groove 44 is an annular surface extending along the radial direction (arrow cd direction) around the axis Y1 at a position at a predetermined depth below (up to arrow b) from the upper surface 42u of the disk portion 42. It has a certain bottom surface 44t. The bottom surface 44t defines a lower boundary (in the direction of arrow b) of the inner circumferential groove 44.

  As shown in FIG. 2, the outer circumferential groove 45 is formed on the outer circumferential side (in the direction of arrow d) with respect to the inner circumferential groove 44. The outer circumferential groove 45 is an annular surface extending along the radial direction (arrow cd direction) around the axis Y1 at a predetermined depth below (up to arrow b) from the upper surface 42u of the disk portion 42. It has a bottom surface 45t. The bottom surface 45t defines a lower boundary (in the direction of arrow b) of the outer circumferential groove 45. The bottom surface 45t is formed at the same position as the bottom surface 44t of the inner circumferential groove 44 in the axial direction (the direction of the arrow ab). The bottom surface 45t may be formed at a position different from the bottom surface 44t in the axial direction (the direction of the arrow ab).

  On the upper surface 42u of the disk portion 42, on the outer circumferential side of the outer circumferential groove 45 (in the direction of arrow d), below the upper surface 42u of disk portion 42 (in the direction of arrow b), radially around the axis Y1 (in the direction of arrow cd). ), An outer peripheral side step surface 45xs, which is an annular surface extending along).

  An outer inner wall surface 45x of the outer peripheral groove 45 is formed between the outer peripheral step surface 45xs and the bottom surface 45t of the outer peripheral groove 45. The outer inner wall surface 45x of the outer circumferential groove 45 is a wall surface that defines a boundary of the outer circumferential groove 45 on the outer circumferential side (the direction of the arrow d). The outer inner wall surface 45x of the outer circumferential groove 45 is centered on the axis Y1 whose diameter decreases inward (in the direction of arrow c) from the outer edge (in the direction of arrow d) of the bottom surface 45t toward the upper side (in the direction of arrow a). Is a conical cylindrical tapered surface. That is, the outer inner wall surface 45x of the outer circumferential groove 45 is inclined outward (arrow d direction) from the inner circumferential side (arrow c direction) edge of the outer circumferential step surface 45xs toward the lower side (arrow d direction). Extending.

  An inner inner wall surface 45i is formed between the upper surface 42u and the bottom surface 45t of the disk portion 42. The inner inner wall surface 45i of the outer circumferential groove 45 is a wall surface that defines a boundary of the outer circumferential groove 45 on the inner circumferential side (in the direction of arrow c). The inner inner wall surface 45i of the outer circumferential groove 45 is centered on an axis Y1 that extends upward (direction of arrow a) along the axial direction (direction of arrow ab) from the inner circumferential side (direction of arrow c) of the bottom surface 45t. It is a cylindrical surface.

  In the rotation device 1, the rotation unit 10 is an optical unit on which optical components such as a plurality of lenses and mirrors are mounted. As shown in FIG. 1, the rotating unit 10 has a frame 11 which is a housing on which optical components (not shown) such as a plurality of lenses and mirrors are mounted. The frame 11 of the rotating unit 10 is formed of a high-performance resin (for example, engineering plastic (engineering plastic) or special engineering plastic (super engineering plastic)).

  The frame 11 of the rotating unit 10 has a disk portion 12 that extends in a disk shape around the axis Y1 and a lower surface 12b that is a lower surface of the disk portion 12 (in the direction of arrow b). And a cylindrical portion 13 that is a cylindrical portion centered on the axis Y1 and erected toward the direction of the arrow b. The cylindrical portion 13 is formed on the outer edge of the lower surface 12b of the disk portion 12. Note that the cylindrical portion 13 may be formed on the frame 11 of the rotating unit 10 on the inner peripheral side (in the direction of arrow c) from the outer edge of the disk portion 12.

  A lower end 13bu, which is a lower end (in the direction of arrow b) of the cylindrical portion 13, extends outward (in the direction of arrow d) from an outer peripheral surface 13x, which is a surface on the outer peripheral side (in the direction of arrow d) of the cylindrical portion 13. A flange portion 14 is provided, which is an annular portion centered on the axis Y1 that projects toward the center. The disk portion 12, the cylindrical portion 13, and the flange portion 14 are formed integrally. In addition, each of the disk part 12, the cylindrical part 13, and the flange part 14 or each may be a separate body, and each or any one may be formed with a different material.

  As shown in FIG. 1, in a state where the frame 11 of the rotary unit 10 is assembled to the hub 40 of the motor 20 (a state in which the cylindrical portion 13 of the frame 11 of the rotary unit 10 is coupled to the hub 40 of the motor 20), The portion 14 is accommodated in the outer circumferential groove 45, and the flange portion 14 is covered with the cured adhesive AD in the outer circumferential groove 45. Specifically, the length in the radial direction (arrow cd direction) from the axis Y1 of the frame 11 of the rotating unit 10 to the inner circumferential surface 13i on the inner circumferential side (arrow c direction) of the cylindrical portion 13 and the disk of the hub 40 The length in the radial direction (the direction of the arrow cd) from the axis Y1 on the upper surface 42u of the portion 42 to the inner inner wall surface 45i of the outer circumferential groove 45 is the same length.

  Further, the inner inner wall surface 45i of the outer circumferential groove 45 of the disk portion 42 of the hub 40 is in contact with the inner circumferential surface 13i of the cylindrical portion 13 of the frame 11 of the rotating unit 10. The width of the outer circumferential groove 45 in the radial direction (the direction of the arrow cd) is larger than the width of the flange portion 14 of the frame 11 of the rotating unit 10 in the radial direction (the direction of the arrow cd). For this reason, the cylindrical portion 13 of the frame 11 of the rotating unit 10 can be assembled to the outer circumferential groove 45 of the disk portion 42 of the hub 40.

  As shown in FIG. 2, in a state where the frame 11 is assembled to the hub 40, the upper surface 14 u that is the upper surface (the direction of the arrow a) of the flange portion 14 is lower than the outer peripheral step surface 45 xs of the outer peripheral groove 45. (Direction of arrow b). The adhesive AD is located above the upper surface 14u of the flange portion 14 (in the direction of the arrow a) from the bottom surface 45t of the outer peripheral groove 45 in the outer peripheral groove 45 and the outer peripheral step surface of the outer peripheral groove 45. It is filled up to below 45xs (in the direction of arrow b). For the adhesive AD, a resin agent other than heat curing which is cured by light or at room temperature is used. For example, an acrylic anaerobic adhesive, an epoxy adhesive, an ultraviolet curable acrylic anaerobic adhesive, or the like is used. Have been.

  The length of the inner peripheral surface 13i of the cylindrical portion 13 of the frame 11 of the rotating unit 10 in the axial direction (the direction of the arrow ab) is the same as the axial direction of the inner inner wall surface 45i of the outer peripheral groove 45 of the hub 40 (the direction of the arrow ab). ) Is shorter than the length. In other words, an annular shape is formed between the lower surface 14 b (the lower surface of the cylindrical portion 13), which is the lower surface (the direction of the arrow b), of the flange portion 14 of the frame 11 of the rotating unit 10 and the bottom surface 45 t of the outer circumferential groove 45 of the hub 40. Gap. For this reason, the adhesive AD is also filled between the lower surface 14 b of the flange portion 14 of the frame 11 of the rotating unit 10 and the bottom surface 45 t of the outer circumferential groove 45 of the hub 40.

  The outer peripheral step surface 45xs is formed below the upper surface 42u of the disk portion 42 (in the direction of the arrow b). Therefore, even when the outer inner wall surface 45x of the outer peripheral side groove 45 is a tapered surface, the opening of the outer peripheral side peripheral groove 45 is widened. It is easy to be accommodated in the circumferential groove 45.

  In the rotating device 1 according to the embodiment of the present invention, the outer inner wall surface 45x of the outer circumferential groove 45 is inclined outward (in the direction of arrow d) from the upper surface 42u of the hub 40 downward (in the direction of arrow b). Extending. When the frame 11 of the rotary unit 10 is assembled to the hub 40, the flange portion 14 is housed in the outer circumferential groove 45. 14 are covered.

  As described above, the flange portion 14 of the cylindrical portion 13 of the frame 11 of the rotating unit 10 protrudes outward from the cylindrical portion 13 (in the direction of arrow d), and the outer inner wall surface 45x of the outer circumferential groove 45 is a tapered surface. The hardened adhesive AD is filled in the outer circumferential groove 45 of the hub 40. For this reason, it is possible to prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from coming off from the outer peripheral side peripheral groove 45 of the disk portion 42 of the hub 40 (prevent from coming off).

  Specifically, the shape of the cured adhesive AD in the outer circumferential groove 45 is larger than the upper side (arrow a direction) of the outer circumferential groove 45 (arrow b direction). It is larger than the opening of the side circumferential groove 45. For this reason, it is possible to prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from falling out of the outer circumferential groove 45 of the disk portion 42 of the hub 40. That is, the outer inner wall surface 45x of the outer circumferential groove 45 inclined with respect to the direction in which the cured adhesive AD covering the cylindrical portion 13 (flange portion 14) of the rotating unit 10 is removed (upward (direction of arrow a)). Serves as a stopper, and can prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from coming off from the outer circumferential groove 45 of the disk portion 42 of the hub 40.

  Further, even if the material of the frame 11 is an engineering plastic or a super engineering plastic having poor adhesiveness, the frame 11 of the rotating unit 10 and the disk portion 42 of the hub 40 can be firmly fastened. That is, regardless of the material of the frame 11, the frame 11 of the rotary unit 10 can be sufficiently fixed to the hub 40 of the motor 20.

  In the rotating device 1 according to the embodiment of the present invention, the inner inner wall surface 45i of the outer circumferential groove 45 in the disk portion 42 of the hub 40 is in contact with the inner circumferential surface 13i of the cylindrical portion 13 in the frame 11 of the rotating unit 10. Abut. Further, in the rotating device 1 according to the embodiment of the present invention, the adhesive AD fills the space between the lower surface 14 b of the flange portion 14 of the frame 11 of the rotating unit 10 and the bottom surface 45 t of the outer circumferential groove 45 of the hub 40. Have been. For this reason, the adhesiveness between the cylindrical portion 13 of the frame 11 of the rotating unit 10 and the outer circumferential groove 45 of the disk portion 42 of the hub 40 can be further improved, and the hub 40 of the motor 20 The frame 11 can be sufficiently fixed.

  As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and includes all aspects included in the concept of the present invention and the claims. In addition, the components may be appropriately selectively combined so as to achieve at least a part of the above-described problems and effects. For example, the shape, material, arrangement, size, and the like of each component in the above-described embodiment can be appropriately changed depending on the specific usage of the present invention.

  For example, in the rotating device 1 according to the embodiment of the present invention, the embodiment of the present invention has been described with an example in which the flange portion 14 is provided on the lower end portion 13bu of the cylindrical portion 13. However, the present invention is not limited to this. For example, as shown in FIG. 3, the groove 15 may be formed in the lower end portion 13bu of the cylindrical portion 13.

  FIG. 3 is a partially enlarged cross-sectional view schematically showing a configuration of a modification of the rotating device 1 shown in FIG. The groove portion 15 is an annular peripheral groove that is recessed from the outer peripheral surface 13x of the cylindrical portion 13 toward the inner peripheral side (the direction of arrow c) at the lower end portion 13bu of the cylindrical portion 13. The groove portion 15 is a cylindrical surface extending along the axial direction (arrow ab direction) around the axis Y1 at a position at a predetermined depth from the outer peripheral surface 13x of the cylindrical portion 13 on the inner circumferential side (arrow c direction). It has a bottom surface 15t. The bottom surface 15t defines a boundary on the inner peripheral side (in the direction of the arrow c) of the groove 15.

  An upper surface 15u is formed above the bottom surface 15t (direction of arrow a), and a lower surface 15b is formed below the bottom surface 15t (direction of arrow b). The upper surface 15u of the groove 15 is a surface that defines an upper boundary (in the direction of arrow a) of the bottom surface 15t, and the lower surface 15b of the groove 15 is a surface that defines a lower boundary (in the direction of arrow b) of the bottom surface 15t. It is. The upper surface 15u of the groove 15 is an annular surface centered on an axis Y1 extending along the radial direction (arrow cd direction) from the upper edge (arrow a direction) of the bottom surface 15t to the outer peripheral side (arrow d direction). The lower surface 15b of the groove 15 has an annular surface centered on an axis Y1 extending from the lower edge (arrow b direction) of the bottom surface 15t to the outer peripheral side (arrow d direction) in the radial direction (arrow cd direction). It is.

  When the frame 11 of the rotary unit 10 is assembled to the hub 40 of the motor 20, the groove 15 is housed in the outer circumferential groove 45, and the groove 15 is formed by the hardened adhesive AD in the outer circumferential groove 45. Is covered. The upper surface 15u of the groove 15 is located below the outer peripheral step surface 45xs of the outer peripheral groove 45 (in the direction of the arrow b). The adhesive AD is located above the upper surface 15u of the groove portion 15 (in the direction of arrow a) from the bottom surface 45t of the outer peripheral side groove 45 in the outer peripheral side groove 45 and the outer peripheral side step surface 45xs of the outer peripheral side groove 45. The space is filled below (in the direction of arrow b). That is, the adhesive AD is also filled in the groove 15.

  In the rotating device 1 according to the modification of the embodiment of the present invention, as the outer inner wall surface 45x of the outer circumferential groove 45 moves downward (in the direction of arrow b) from the upper surface 42u of the hub 40, the outer peripheral surface (in the direction of arrow d). ). When the frame 11 of the rotary unit 10 is assembled to the hub 40, the groove 15 is housed in the outer circumferential groove 45, and the groove 15 is formed in the outer circumferential groove 45 by the cured adhesive AD. Covered.

  Thus, the groove 15 of the cylindrical portion 13 in the frame 11 of the rotating unit 10 is recessed from the cylindrical portion 13 toward the inner periphery (in the direction of arrow c), and the outer inner wall surface 45x of the outer peripheral groove 45 is a tapered surface. The hardened adhesive AD is filled in the outer circumferential groove 45 of the hub 40. For this reason, it is possible to prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from falling out of the outer circumferential groove 45 of the disk portion 42 of the hub 40. Even if the material of the frame 11 is an engineering plastic or a super engineering plastic whose adhesiveness is inferior, the connection between the cylindrical portion 13 of the frame 11 of the rotating unit 10 and the outer circumferential groove 45 of the disk portion 42 of the hub 40 is firmly fastened. can do. That is, the frame 11 of the rotating unit 10 can be sufficiently fixed to the hub 40 of the motor 20.

  In the rotating device 1 according to the embodiment of the present invention, the outer inner wall surface 45x of the outer circumferential groove 45 extends upward (in the direction of arrow a) from the outer edge (direction of arrow d) of the bottom surface 45t. The embodiment of the present invention has been described by taking, as an example, the case of a conical cylindrical tapered surface centered on the axis Y1 whose diameter is reduced toward the inner peripheral side (the direction of arrow c). The outer inner wall surface 45x of the outer circumferential groove 45 may have a surface rougher than the inner inner wall surface 45i of the outer circumferential groove 45, and the outer inner wall surface 45x of the outer circumferential groove 45 may have a cross-sectional wave shape or the like. It may have a predetermined shape.

  As described above, since the surface of the outer inner wall surface 45x of the outer circumferential groove 45 is rougher than the surface of the inner inner wall surface 45i of the outer circumferential groove 45, the cured adhesive AD and the outer inner wall surface of the outer circumferential groove 45 are formed. Since the adhesiveness with 45x becomes higher, it is possible to prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from coming off from the outer circumferential groove 45 of the disk portion 42 of the hub 40.

  Further, in the rotating device 1 according to the embodiment of the present invention, the case where the outer inner wall surface 45x of the outer circumferential groove 45 is a tapered surface has been described as an example. The present invention is not limited to this. The outer inner wall surface 45x of the outer circumferential groove 45 extends upward (in the direction of arrow a) along the axial direction (in the direction of arrow ab) from the outer edge (in the direction of arrow d) of the bottom surface 45t. It may be a cylindrical surface centered on the extending axis Y1. Further, the outer inner wall surface 45x of the outer circumferential groove 45 may have a rougher surface than the inner inner wall surface 45i of the outer circumferential groove 45, and the outer inner wall surface 45x of the outer circumferential groove 45 has a cross-sectional wave shape. And the like. Even in such a case, it is possible to prevent the cylindrical portion 13 of the frame 11 of the rotating unit 10 from falling out of the outer circumferential groove 45 of the disk portion 42 of the hub 40 as in the case described above.

  DESCRIPTION OF SYMBOLS 1 ... Rotating device, 10 ... Rotating unit, 11 ... Frame, 12 ... Disc part, 12b ... Lower surface, 13 ... Cylindrical part, 13bu ... Lower end part, 13i ... Inner peripheral surface, 13x ... Outer peripheral surface, 14 ... Flange part , 14u: upper surface, 14b: lower surface, 15: groove portion, 15u: upper surface, 15b: lower surface, 15t: bottom surface, 20: motor, 21: base, 22: boss, 23: stator, 24: stator core, 25: coil, 26 ... rotor, 27 ... yoke, 28 ... rotor magnet, 29 ... flexible wiring board, 30 ... shaft, 30u ... upper end, 30x ... outer peripheral surface, 40 ... hub, 41 ... accommodation concave part, 42 ... disk part, 42u ... Upper surface, 42b: Lower surface, 42c: Through hole, 43: Cylindrical portion, 44: Inner circumferential groove, 44t: Bottom surface, 45: Outer circumferential groove, 45t: Bottom surface, 45i: Inner inner wall surface, 45x: Outer inner wall 45xs outer peripheral step surface, 50 fluid dynamic bearing device, 51 thrust plate, 51u upper surface, 51b lower surface, 52 case, 52i inner peripheral surface, 53 end plate, 53u upper surface, 54 Bearing member, 54b: lower surface, 54i: inner peripheral surface, 54ia, 54ib, 54ba, 53ua: dynamic pressure bearing surface, AD: adhesive, Y1: shaft

Claims (4)

A motor, comprising a rotating unit rotated by the motor,
The motor includes a rotatably supported shaft, and a hub fixed to one end of the shaft,
The rotation unit has a cylindrical portion coupled to the hub,
The cylindrical portion has a flange portion extending radially outward from the outer peripheral surface of the cylindrical portion, or has a groove recessed radially inward from the outer peripheral surface of the cylindrical portion,
The hub has a disk portion extending radially outward of the shaft,
The disk portion has a circumferential groove that opens on one side,
The outer inner wall surface of the circumferential groove extends radially outwardly from one side toward the other side,
The flange portion or the groove portion of the cylindrical portion is housed in the circumferential groove,
The rotating device, wherein the flange or the groove is covered with a cured adhesive in the peripheral groove. The cylindrical portion has an inner peripheral surface,
The rotating device according to claim 1, wherein an inner inner wall surface of the peripheral groove is in contact with an inner peripheral surface of the cylindrical portion.   3. The rotating device according to claim 1, wherein a gap is provided between the other side surface facing the other side of the cylindrical portion and the bottom surface of the circumferential groove, and the adhesive is present in the gap.   The rotating device according to any one of claims 1 to 3, wherein an outer inner wall surface of the peripheral groove has a rougher surface than an inner inner wall surface of the peripheral groove.

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