JP2012165541A - Motor and recording disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of surely performing retaining by a retaining member in a simple structure.SOLUTION: A rotation part 4 of a motor 1 includes a rotor yoke 41 and a retaining member 6 fixed to a lid part of the rotor yoke 41, and the retaining member 6 includes a lower fixing part abutted to a lower surface of the lid part, a plurality of lower projection parts projecting downwards from the lower fixing part, a plurality of upper projection parts inserted to a plurality of lid part through-holes 81, and a plurality of retaining parts projecting inward or outward in the radial direction at the lower part of the plurality of lower projection parts and positioned near the lower part of a part of a static part 2 or a bearing mechanism 3. A through-hole forming part forming the respective lid part through-holes 81 includes at least one outer side contact part to be in contact with the part on the radial direction outer side of the upper projection parts and at least one inner side contact part to be in contact with the part on the radial direction inner side of the upper projection parts at a position different from the at least one outer side contact part in a circumferential direction.

Description

  The present invention relates to an electric motor.

  Conventionally, some motors are provided with a retaining member at a rotating portion. The retaining member prevents the rotating part from being separated from the stationary part.

  Japanese Unexamined Patent Application Publication No. 2004-248332 discloses an engaging member that is a retaining member attached to an insertion hole of a rotor yoke. The engaging member includes a collar portion, a mounting claw, and a hook. The flange portion is hooked on the upper surface of the rotor yoke around the insertion hole. The attachment claw is located below the insertion hole. The engaging member is fixed to the rotor yoke by the flange portion and the attachment claw. The hook extends downward through the insertion hole. The protrusion at the tip of the hook engages with the locking portion of the bearing housing without contact. As a result, the rotor is prevented from coming off from the stator. A gap is provided between the lower surface of the rotor yoke and the mounting claw in the direction parallel to the central axis, and a gap is provided between the hook and the inner side surface of the insertion hole in the radial direction.

  Japanese Patent Application Laid-Open No. 2007-318990 discloses an annular engagement portion that prevents the rotation member of the spindle motor from being detached. The engaging part is manufactured by injection molding of synthetic resin. The engaging portion is provided with a number of engaging protrusions that protrude upward from the annular main body portion. The engaging protrusion is inserted into the coupling hole formed in the rotor case, whereby the engaging portion is fixed to the rotor case.

  In the disk drive disclosed in Japanese Patent Laid-Open No. 2006-196139, the disk holding part and the retaining part on the upper surface of the turntable are provided as one member. The retaining portion protrudes toward the base portion through a through hole formed in the turntable. The hook portion at the tip is locked to a hook locking portion formed on the outer peripheral wall of the bearing holding portion.

  In the brushless motor disclosed in Japanese Patent Application Laid-Open No. 2005-323420, the retaining member is fixed to a fixing portion provided around the rotation shaft by bonding, screwing, or the like.

In the spindle motor disclosed in Korean Registered Patent No. 10-0643936, a hole is provided in the rotor yoke. The hole includes a wide portion having a large width in the radial direction and a narrow portion having a width smaller than that of the wide portion. The stopper, which is a retaining member, includes an annular main body and a protruding portion that protrudes upward from the main body. The tip of the protrusion extends radially outward. When the stopper is fixed to the rotor yoke, the protruding portion is inserted into the wide portion from below, and the main body abuts against the lower surface of the rotor yoke. By rotating the stopper with respect to the rotor yoke, the projecting portion moves into the narrow portion, and the tip of the projecting portion faces the upper surface of the rotor yoke around the narrow portion.
JP 2004-248332 A JP 2007-318990 A JP 2006-196139 A JP 2005-323420 A Korean Registered Patent No. 10-0643936

  By the way, in order to facilitate the automation of the manufacture of the motor, it is necessary to fix the retaining member to the rotor yoke easily and firmly. In JP 2004-248332 A, the retaining member can be fixed to the rotor yoke without using an adhesive, but a gap is provided between the retaining member and the rotor yoke. For this reason, there exists a possibility that a securing member may rattle with respect to a rotor yoke. Also in Korean Registered Patent No. 10-0643936, there is a possibility that the stopper rattles against the rotor yoke. In Japanese Patent Laid-Open No. 2006-196139, since the disk holding portion and the retaining portion are one member, the mold design is complicated.

  The motor mounted on the recording disk drive device is provided with a chucking device that holds the recording disk on the rotor yoke. Some chucking devices are provided with a claw member that holds a recording disk by using the elastic force of an elastic member such as a coil spring. When fixing the retaining member on the disk mounting portion, it is necessary to avoid interference between the retaining member, the claw member, and the elastic member.

  An object of the present invention is to more reliably prevent a motor from coming off by a retaining member with a simple structure.

  A motor according to an exemplary aspect of the present invention is supported above a stationary portion by a stationary portion, a bearing mechanism, and the bearing mechanism, and is rotatable about a central axis with respect to the stationary portion. A rotating yoke that is supported, and the rotating portion is a substantially cylindrical rotor yoke with a lid, and a retaining member that is fixed to the lid portion of the rotor yoke and prevents separation of the rotating portion from the stationary portion. The retaining member is a continuous member, and the retaining member includes a lower fixing portion that directly or indirectly contacts the lower surface of the lid portion, and a plurality of lower protrusions projecting downward from the lower fixing portion. A plurality of upper projecting portions projecting upward from the plurality of lower projecting portions and inserted into the plurality of lid portion through holes formed in the lid portion, and a diameter at a lower portion of the plurality of lower projecting portions. Projecting inward or outward in the direction, the stationary part or the bearing mechanism A plurality of retaining portions located close to the lower part, and the lower fixing portion is provided at a lower portion of each lower protrusion with respect to a virtual plane perpendicular to the radial direction at the position of each lower protrusion. At least one outer contact that has a portion located on the side opposite to the secured retaining portion and that has a through hole forming portion that forms each lid portion through hole is in contact with a radially outer portion of the upper protrusion to be inserted And at least one inner contact portion that contacts a radially inner portion of the upper protrusion at a position different from the at least one outer contact portion in the circumferential direction.

  According to the present invention, the retaining by the retaining member can be more reliably performed with a simple structure.

FIG. 1 is a cross-sectional view of the recording disk drive apparatus according to the first embodiment. FIG. 2 is a sectional view of the motor. FIG. 3 is a cross-sectional view of the motor. FIG. 4 is a cross-sectional view of the through hole forming portion. FIG. 5 is a plan view of the retaining member. FIG. 6 is a cross-sectional view of the retaining member. FIG. 7 is a cross-sectional view of the retaining member. FIG. 8 is a sectional view of the motor. FIG. 9 is a plan view of the retaining member. FIG. 10 is a cross-sectional view of the through hole forming portion and the retaining member. FIG. 11 is a plan view of the motor. FIG. 12 is a sectional view of the motor. FIG. 13 is a diagram illustrating a flow of assembly of the motor. FIG. 14 is a plan view of the original member of the retaining member. FIG. 15 is a cross-sectional view of the retaining member and the disk mounting portion. FIG. 16 is a cross-sectional view of the retaining member and the preload magnet. FIG. 17 is a cross-sectional view of the rotating unit. FIG. 18 is a cross-sectional view of the rotating part, the stationary part, and the bearing mechanism. FIG. 19 is a diagram illustrating another example of the retaining member. FIG. 20 is a cross-sectional view showing another example of the through hole forming portion. FIG. 21 is a cross-sectional view illustrating another example of the through hole forming portion and the retaining member. FIG. 22 is a cross-sectional view of a motor according to the second embodiment. FIG. 23 is a cross-sectional view of the through hole forming portion and the retaining member. FIG. 24 is a cross-sectional view of a motor according to the third embodiment. FIG. 25 is a cross-sectional view of the through hole forming portion and the retaining member. FIG. 26 is a cross-sectional view of a motor according to the fourth embodiment. FIG. 27 is a plan view showing a retaining member of the motor according to the fifth embodiment. FIG. 28 is a sectional view of the motor. FIG. 29 is a cross-sectional view of the rotating portion, the stationary portion, and the bearing mechanism. FIG. 30 is a diagram illustrating another example of the bush. FIG. 31 is a plan view showing a retaining member of the motor according to the sixth embodiment. FIG. 32 is a diagram illustrating another example of the retaining member. FIG. 33 is a cross-sectional view showing another example of the through hole forming portion and the retaining member. FIG. 34 is a cross-sectional view of a motor showing another example of a stator.

  In the present specification, the upper side of FIG. 1 in the direction of the central axis of the motor is simply referred to as “upper side” and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device. A direction parallel to the central axis is referred to as an “axial direction”, a radial direction centered on the central axis is simply referred to as “radial direction”, and a circumferential direction centered on the central axis is simply referred to as “circumferential direction”.

(First embodiment)
FIG. 1 is a cross-sectional view of a recording disk drive apparatus according to a first exemplary embodiment of the present invention. The recording disk drive device 10 includes a motor 1, an access unit 11, and a box-shaped housing 12 that accommodates them. The motor 1 is a slim type having a height of several mm to several tens of mm. In the motor 1, a chucking device 5 to be described later is fitted into the central hole 91 of the recording disk 9, and the recording disk 9 is fixed by the chucking device 5. The access unit 11 includes a head 111 and a head moving mechanism 112. The head 111 is an optical pickup mechanism that reads and / or writes information on the recording disk 9. For example, a Blu-ray disc is used as the recording disc 9. Other types of optical discs may be used.

  The head moving mechanism 112 moves the head 111 with respect to the motor 1 and the recording disk 9. The head 111 has a light emitting part and a light receiving part. The light emitting unit emits laser light toward the lower surface of the recording disk 9. The light receiving unit receives reflected light from the recording disk 9. The housing 12 has a lid 121 at the top thereof that opens and closes when the recording disk 9 is attached to and removed from the recording disk drive device 10. In the recording disk drive device 10, the recording disk 9 is rotated by the motor 1, and the head moving mechanism 112 moves the head 111 to a required position, and information is read from and / or written to the recording disk 9.

  FIG. 2 is a longitudinal sectional view of the motor 1. The recording disk 9 is indicated by a two-dot chain line. The motor 1 includes a stationary part 2 that is a fixed assembly, a bearing mechanism 3, a rotating part 4 that is a rotating assembly, and a chucking device 5. The rotating part 4 is located above the stationary part 2 and the bearing mechanism 3, and is supported by the bearing mechanism 3 so as to be rotatable about the central axis J <b> 1 with respect to the stationary part 2. The chucking device 5 is provided on the upper portion of the rotating unit 4.

  The stationary portion 2 includes a substantially plate-shaped base portion 21, a stator 22, an annular stator holding member 23, and a circuit board 24. The base portion 21 is made of metal. The bearing mechanism 3 is attached to the bearing holder 211 provided in the center of the base portion 21. In the base portion 21, the rigidity of the bearing holder 211 is improved by bending the portion around the bearing holder 211 into a base shape protruding upward. Further, since the bearing holder 211 is a portion bent downward, the space around the bearing mechanism 3 can be used more effectively than when the bearing holder 211 is bent upward.

  The stator 22 is provided outside the bearing mechanism 3 in the radial direction, and includes a stator core 221 and a plurality of coils 222 formed on the stator core 221. Stator core 221 is formed of a laminated steel plate. The circuit board 24 is disposed on the base portion 21. The stator holding member 23 is provided around the bearing mechanism 3 and is positioned below the upper end of the stator 22. In the stationary part 2, the stator core 221 is provided on the outer periphery of the stator holding member 23, so that the stator 22 is indirectly fixed to the bearing mechanism 3.

  FIG. 3 is an enlarged view showing the vicinity of the bearing mechanism 3. The bearing mechanism 3 includes a shaft 31, a bottomed substantially cylindrical bush 32, a sleeve 33, and a lubricating oil 34. The bush 32 is molded by pressing a magnetic material. Thereby, the bush 32 can be manufactured at low cost. The lower part of the bush 32 is fixed inside the bearing holder 211. The lubricating oil 34 is held inside the bush 32.

  A stator holding member 23 is attached to the outer surface of the cylindrical portion 321 of the bush 32. The upper part of the cylindrical part 321 protrudes radially outward centering on the central axis J1. Hereinafter, the upper portion is referred to as “flange portion 321a”. The flange portion 321a can ensure sufficient strength by being formed by drawing. In the bush 32, the position of the flange portion 321a, that is, the position of the upper end of the bush 32 is lower than the position of the upper end 222a of the coil 222 in the direction parallel to the central axis J1. A disc-shaped thrust plate 35 is provided on the inner bottom surface of the bottom portion 322 of the bush 32. The thrust plate 35 abuts on the lower end of the sleeve 33 and is pressed and fixed by the sleeve 33.

  The sleeve 33 is formed of an oil-containing porous sintered metal body, and is fixed to the inner side surface 321b of the bush 32 by press-fitting. The sleeve 33 may be press-fitted over the entire axial direction of the inner surface 321b of the bush 32. An upper portion 331 of the sleeve 33 protrudes from the bush 32. The central portion of the inner surface 332 of the sleeve 33 is recessed outward in the radial direction. A location 333 that supports the shaft 31 of the sleeve 33 in the radial direction is located above the press-fit location between the bush 32 and the bearing holder 211. This prevents the sleeve 33 from being distorted when the lower portion of the bush 32 to which the sleeve 33 is fixed is press-fitted into the bearing holder 211. Further, since the lower portion of the inner side surface 332 is greatly depressed outward in the radial direction, even if the inner side surface 332 of the sleeve 33 is distorted, it is prevented from affecting the rotation of the shaft 31. .

  In the motor 1, the lower end of the shaft 31 inserted into the sleeve 33 comes into contact with the bottom 322 of the bush 32 via the thrust plate 35, so that the shaft 31 is stably supported in the thrust direction. Further, the shaft 31 is supported by the sleeve 33 in the radial direction via the lubricating oil 34.

  As shown in FIG. 2, the rotating unit 4 includes a covered substantially cylindrical rotor yoke 41, a rotor magnet 42, an annular preload magnet 43, an annular rubber 44, and an annular retaining member 6. The rotor yoke 41 is made of a magnetic material and covers the stator 22. The rotor yoke 41 includes a lid portion, a cylindrical portion 412, and a cylindrical shaft fixing portion 413, and the lid portion is a disk placement portion 411. The disk mounting portion 411 is substantially perpendicular to the central axis J <b> 1 and extends around the chucking device 5. The disk mounting portion 411 includes a plurality of through hole forming portions 8 that form a plurality of lid through holes 81. The plurality of lid portion through holes 81 are provided at equal intervals in the circumferential direction (see FIG. 11). FIG. 4 is a cross-sectional view of the through hole forming portion 8 of FIG. 2 cut along a plane perpendicular to the central axis J1. The right side in FIG. 4 corresponds to the radially inner side. The lid part through-hole 81 has a V-shape that is convex outward in the radial direction when viewed in plan. The maximum width in the radial direction of the lid portion through-hole 81 is about 0.8 mm, which is about the same as or larger than the plate thickness of the disk mounting portion 411. Thereby, the cover part through-hole 81 can be easily provided with a press. The annular rubber 44 shown in FIG. 2 is provided on the outer periphery of the upper surface of the disk mounting portion 411. The recording disk 9 is mounted on the disk mounting portion 411 indirectly via the annular rubber 44.

  The cylindrical part 412 extends downward from the outer periphery of the disk mounting part 411. A rotor magnet 42 is attached to the inner side surface of the cylindrical portion 412. The rotor magnet 42 faces the stator 22 in a direction perpendicular to the central axis J1. When the motor 1 is driven, a magnetic action is generated between the rotor magnet 42 and the stator 22. The shaft fixing part 413 is provided at the center of the disk mounting part 411. The upper portion of the shaft 31 is inserted into the shaft fixing portion 413.

  The preload magnet 43 is provided on the lower surface of the disk mounting portion 411 while facing the flange portion 321a of the bush 32 in the direction of the central axis J1. The preload magnet 43 is multipolarly magnetized in the circumferential direction. Thereby, a magnetic loop becomes smaller than single pole magnetization, and the magnetic influence on other members is reduced.

  In the rotating portion 4, the preload magnet 43 overlaps with the flange portion 321a in the direction parallel to the central axis J1 and is disposed close to the flange portion 321a, so that it is sufficient between the preload magnet 43 and the bearing mechanism 3. Magnetic action occurs. The preload magnet 43 is located radially inward of the stator 22. Thus, magnetic interference between the preload magnet 43 and the stator 22 is prevented. Further, in the motor 1, the influence of the preload magnet 43 on the electrical characteristics of the stator 22 is reduced as compared with the case where the preload magnet 43 is provided on the upper portion of the stator 22. The retaining member 6 is fixed to the disk mounting portion 411. The motor 1 has a structure that allows the shaft 31 to be easily pulled out from the sleeve 33 when the retaining member 6 is not present. By providing the retaining member 6, separation of the rotating part 4 from the stationary part 2 is prevented. The retaining member 6 is easily molded by pressing a metal plate member.

  FIG. 5 is a plan view of the retaining member 6. 6 and 7 are cross-sectional views of the retaining member 6 cut at the positions of arrows A and B in FIG. 5, respectively. FIG. 7 also shows the shape visible on the back side. As shown in FIGS. 5 to 7, the retaining member 6 includes three arcuate contact portions 611 perpendicular to the central axis J1, three upper projecting portions 621, three lower projecting portions 63, and FIG. And three dropout prevention parts 64 shown in FIG. The retaining member 6 is a continuous member. In the retaining member 6, each part such as the upper projecting portion 621 has a plate shape, and the thickness of each part is approximately 0.3 mm.

  The lower protrusion 63 and the drop-off prevention part 64 protrude downward from the contact part 611. A retaining portion 631 that projects radially inward is provided below the lower projecting portion 63. The upper protrusion 621 is located at the same position as the lower protrusion 63 in the circumferential direction, and protrudes upward from the lower protrusion 63. The upper protrusion 621 includes a protrusion 623 that protrudes inward in the radial direction. As shown in FIG. 6, the upper projecting portion 621 is provided with an inclined portion 621 a that is directed upward in the radial direction while being directed upward on the upper side of the protruding portion 623. 5 to 7, the upper protrusion 621 is shown extending in parallel to the central axis J1. However, as shown in FIG. 8, in the state where the retaining member 6 is fixed to the disk mounting portion 411, the upper protruding portion 621 is bent outward toward the disk mounting portion 411.

  As shown in FIG. 5, the three contact portions 611 are arranged at equal intervals in the circumferential direction. The upper projecting portion 621 and the lower projecting portion 63 are provided between the contact portions 611 at equal intervals in the circumferential direction, and are annularly connected by the contact portion 611 on the radially outer side than the retaining portion 631. The drop-off prevention part 64 is located between the lower protrusions 63 in the circumferential direction.

  As shown in FIG. 9, in the abutting portion 611 located on the upper left and upper right in FIG. 9 of the retaining member 6, the portion 611 a located around the lower projecting portion 63 on the upper side in FIG. The virtual surface 92 perpendicular to the radial direction is located on the opposite side to the retaining portion 631 provided at the lower portion of the lower protruding portion 63. Hereinafter, the virtual surface 92 perpendicular to the radial direction at the position of each lower protrusion 63 is simply referred to as a “virtual surface 92”.

  Similarly, in the abutting portion 611 located on the lower and upper right sides of FIG. 9, the portion 611 b located around the lower protruding portion 63 on the lower right side of FIG. , Located on the opposite side to the retaining portion 631 provided at the lower portion of the lower protruding portion 63. Further, in the lower and upper left contact portions 611, a portion 611 c located around the lower left lower protrusion 63 is provided below the lower protrusion 63 with respect to the virtual surface 92 at the position of the lower protrusion 63. It is located on the opposite side to the provided retaining portion 631. In the following description, each of the portions 611a to 611c of the contact portion 611 is referred to as a “prevention peripheral portion”.

  As shown in FIG. 8, in the rotating part 4, the contact part 611 of the retaining member 6 comes into contact with the lower surface of the disk mounting part 411. The upper protruding portion 621 is press-fitted into the lid portion through-hole 81 of the disc placement portion 411. A portion of the upper projecting portion 621 located above the disk mounting portion 411 is bent outward in the radial direction, and the lower surface is in contact with the upper surface of the disk mounting portion 411. As described above, the shape of the lid through-hole 81 shown in FIG. 4 when viewed in plan is a V-shape that is convex outward in the radial direction. Can be easily folded.

  FIG. 10 is a cross-sectional view of the through hole forming portion 8 and the upper protruding portion 621 shown in FIG. 8 cut along a plane perpendicular to the central axis J1. In the through-hole forming portion 8, a protruding portion in which the portion 811 protruding radially outward on the radially inner side of the edge portion 80 of the lid portion through-hole 81 is a radially inner portion of the upper protruding portion 621. 623 contacts. Hereinafter, the part 811 is referred to as an “inner contact part 811”. Further, in the edge portion 80, the portions 813 located on both sides of the recessed portion 812 that is recessed radially outward on the radially outer side are in contact with the radially outer portion of the upper protruding portion 621. Hereinafter, the part 813 is referred to as an “outer contact part 813”. The inner contact portion 811 is located between the two outer contact portions 813 in the circumferential direction.

  As shown in FIG. 8, the three contact portions 611 and the three upper projecting portions 621 sandwich the disc mounting portion 411. As a result, the position of the retaining member 6 in the direction parallel to the central axis J1 with respect to the disk mounting portion 411 is fixed. Hereinafter, the three contact portions 611 are collectively referred to as a “lower fixing portion 61”, and the three upper protruding portions 621 are collectively referred to as an “upper fixing portion 62”. Since the lower fixing portion 61 is located radially inward of the coil 222 of the stator 22, a winding space for the coil 222 is ensured without increasing the motor 1 in the direction of the central axis J <b> 1.

  The lower protruding portion 63 protrudes downward from the lower surface of the disk mounting portion 411 and is positioned between the stator 22 and the bush 32 in the radial direction. The retaining portion 631 projects radially inward from the lower portion of the lower projecting portion 63, and is positioned close to the lower portion of the flange portion 321 a that is a part of the bearing mechanism 3. The retaining portion 631 is located below the upper end 221 a on the radially inner side of the stator core 221. In the motor 1, when a force in a direction away from the stationary portion 2 is applied to the rotating portion 4, the retaining portion 631 contacts the flange portion 321 a, thereby preventing the rotating portion 4 from being separated from the stationary portion 2.

  In the dropout prevention portion 64, the tip 641 bends below the lower surface of the preload magnet 43. In the present embodiment, the preload magnet 43 and the dropout prevention portion 64 are separated by about 50 μm in the direction parallel to the central axis J1 and in the radial direction. Note that the preload magnet 43 and the drop-off prevention part 64 may contact each other.

  In the motor 1, even if the preload magnet 43 is temporarily separated from the disk mounting portion 411 due to the force applied from the outside, the preload magnet 43 contacts the tip 641 of the drop-off preventing portion 64, so that the preload magnet 43 moves downward. Is limited. In this way, the preload magnet 43 is easily prevented from falling off with a simple structure using a part of the retaining member 6. In the motor 1, it is not necessary to separately provide a part for preventing the preload magnet 43 from falling off, so that the manufacturing cost is reduced.

  In the retaining member 6, the lower protruding portion 63 and the drop-off preventing portion 64 are provided in the vicinity of the outer periphery of the preload magnet 43, and the preload magnet 43 radially outwards by a force applied from the outside with a simple structure. Movement is restricted. In the present embodiment, the preload magnet 43 and the lower projecting portion 63 are slightly separated in the radial direction. However, the present invention is not limited to this, and the preload magnet 43 and the lower protrusion 63 may contact each other.

  FIG. 11 is a plan view of the motor 1. In FIG. 11, the details of the chucking device 5 are not shown, and the lid through hole 81 of the disk mounting portion 411 and the upper protruding portion 621 of the retaining member 6 are indicated by broken lines. The chucking device 5 includes a center case 51, three claw members 52, three coil springs 53, and three alignment claws 54. The center case 51 has a hollow and thick disc shape centered on the central axis J1. The three claw members 52 are arranged in the circumferential direction and protrude outward in the radial direction from the center case 51. In the circumferential direction, between the claw members 52, the lid portion through-hole 81 of the disk mounting portion 411 is located. The coil spring 53 is accommodated in the center case 51 and urges the claw member 52 radially outward. In the motor 1, other elastic members such as rubber may be used instead of the coil spring. Each of the three alignment claws 54 is disposed between two adjacent claw members 52.

  As shown in FIG. 12, the claw member 52 includes a claw part main body 521 and a blade part 522. The nail | claw part main body 521 has the lower surface 521a which goes to a radial direction inner side while going below. The blade portions 522 are provided on both sides of the claw portion main body 521 in the circumferential direction. The lower surface 522a of the blade portion 522 has a substantially cylindrical surface curved in the radial direction.

  When the recording disk 9 is fixed on the disk mounting portion 411, the recording disk 9 abuts on the claw body 521 so that the claw body 521 rotates slightly clockwise in FIG. At the same time, it moves inward in the radial direction. At this time, the lower surface 522 a of the blade portion 522 is in sliding contact with the upper surface of the disk mounting portion 411. The recording disk 9 is mounted on the disk mounting portion 411 while being centered on the central axis J1 by the alignment claw 54 of FIG. At this time, as shown in FIG. 2, the tip of the claw body 521 moves to the upper side of the recording disk 9, and the claw member 52 is pushed by the coil spring 53 and returned radially outward. The claw member 52 comes into contact with the upper edge of the central hole 91 of the recording disk 9. As described above, in the chucking device 5, the tip of the claw body 521 moves in the vertical direction and the radial direction. The recording disk 9 is fixed on the disk mounting portion 411 by receiving a force directed radially outward and downward by the claw member 52.

  Next, the assembly flow of the motor 1, in particular, the assembly flow of the rotating unit 4 will be described with reference to FIG. 13. As shown in FIG. 14, a metal plate member is punched with a press, whereby the original member 69 of the retaining member 6 is molded. In the retaining member 6, the annular main body portion of the original member 69 corresponds to the lower fixing portion 61. A portion projecting radially outward from the main body corresponds to the upper projecting portion 621. Furthermore, a portion located on the radially inner side of the outward projecting portion corresponds to the lower projecting portion 63. The portions projecting radially inward on both sides in the circumferential direction of the portion projecting outward correspond to the dropout prevention portion 64.

  Hereinafter, each part of the original member 69 will be described with the same name while attaching the same symbol as the corresponding part of the retaining member 6.

  First, the upper protruding portion 621 is slightly bent at the central portion, whereby the inclined portion 621a in FIG. 6 is molded. In parallel with the forming of the inclined portion 621a, a part of the upper protruding portion 621 protrudes upward on the radially inner side of the inclined portion 621a, whereby the protruding portion 623 of FIG. 6 is formed. In addition, the protrusion part 623 may be shape | molded before the inclination part 621a, and may be shape | molded after it. Further, the tip of the lower protrusion 63 is bent upward, and the retaining portion 631 of FIGS. 6 and 7 is formed at the tip of the lower protrusion 63. The tip of the drop-off prevention part 64 is also bent upward.

  Next, the lower protruding portion 63 is bent downward from the lower fixing portion 61 at a position denoted by reference numeral 65 between the lower protruding portion 63 and the lower fixing portion 61. Hereinafter, the portion at the position denoted by reference numeral 65 is referred to as a “folded portion 65”. At this time, the upper protrusion 621 aligned in the radial direction with the lower protrusion 63 faces upward. Further, the drop-off preventing part 64 is bent downward from the lower fixing part 61 at a position denoted by reference numeral 66 between the drop-off preventing part 64 and the lower fixing part 61. The retaining member 6 is molded by the above flow (step S1).

  On the other hand, in parallel with the molding of the retaining member 6, the rotor yoke 41 of FIG. 2 is molded by a press (step S2). At this time, as shown in FIG. 15, in the disk mounting portion 411 of the rotor yoke 41, a concave portion that is recessed upward is formed by half-punching by pressing. Moreover, the cover part through-hole 81 is formed by punching the bottom part of a recessed part toward the upper part from the downward direction. In addition, after the cover part through-hole 81 is formed, a recessed part may be formed. In the lid part through-hole 81, a cross section obtained by cutting the lower edge 414b along the plane including the central axis J1 is smoothly convex, that is, has a substantially arc shape. Hereinafter, the edge 414b is referred to as a “lower edge 414b”.

  Next, as shown in FIG. 16, the lower protruding portion 63 and the drop-off preventing portion 64 are inserted into the holes of the holder 93. And the preload magnet 43 is arrange | positioned at the front-end | tip 641 of the drop-off prevention part 64 (step S3).

  As shown in FIG. 15, the upper protrusion 621 is inserted into the lid through-hole 81 of the disk mounting portion 411 while keeping the relative positions of the retaining member 6 and the preload magnet 43 approximately constant (step S4).

  In the middle of the insertion, in the lid part through-hole 81, the tip end part 621 b of the upper projecting part 621 is positioned approximately at the center of the lid part through-hole 81. In addition, at least one of the inclined portions 621 a of the upper projecting portion 621 is in sliding contact with the radially outer portion of the lower edge 414 b of the lid portion through-hole 81, and the lower portion 621 c is the diameter of the inner surface of the lid portion through-hole 81. It is in sliding contact with the outer part in the direction.

  By placing the lower fixing portion 61 in contact with the lower surface of the disc placement portion 411, the placement of the rotor yoke 41 on the retaining member 6 is completed. The preload magnet 43 comes into contact with the lower surface of the disk mounting portion 411 by a magnetic action. As shown in FIG. 10, the protrusion 623 of the upper protruding portion 621 contacts the inner contact portion 811 in the radial direction in the lid portion through hole 81. On both sides of the inner contact portion 811 in the circumferential direction, the radially outer portions of the upper protruding portion 621 abut against the outer contact portion 813 in the radial direction. As a result, the upper protruding portion 621 is pressed into the through-hole forming portion 8, and the position of the upper protruding portion 621 in the radial direction is fixed.

  Next, as indicated by an arrow 89 in FIG. 17, a portion of the upper projecting portion 621 located above the lid portion through-hole 81 is radially outward toward the upper surface of the disk mounting portion 411. That is, the radial direction is bent in a direction opposite to the protruding direction of the retaining portion 631, and a part of the upper protruding portion 621 comes into contact with the upper surface of the disk mounting portion 411. The disk mounting portion 411 is sandwiched between the upper fixing portion 62 and the lower fixing portion 61 which are the plurality of upper protruding portions 621. In this way, the position of the retaining member 6 in the direction parallel to the central axis J1 with respect to the disk mounting portion 411 is fixed (step S5). In the motor 1, the retaining member 6 can be easily fixed to the disk mounting portion 411 by using caulking.

  In the retaining member 6, the circumferential width of the upper protruding portion 621 shown in FIG. 14 is set smaller than the circumferential width of the bent portion 65. As a result, the force required to bend the upper protruding portion 621 toward the upper surface of the disk mounting portion 411 is smaller than the force that plastically deforms the bent portion 65. This prevents the orientation of the retaining portion 631 in FIG. 17 from changing when the retaining member 6 is fixed.

  In the rotor yoke 41, the annular rubber 44 and the rotor magnet 42 are attached to the outer periphery of the disk mounting portion 411 and the cylindrical portion 412 in FIG. The annular rubber 44 and the rotor magnet 42 may be attached before the retaining member 6 is attached to the rotor yoke 41. Further, as shown in FIG. 2, the chucking device 5 is attached on the disk mounting portion 411 (step S6).

  On the other hand, the stationary part 2 and the bearing mechanism 3 are separately assembled, and the bearing mechanism 3 is attached to the stationary part 2. As shown in FIG. 18, the rotating portion 4 is disposed above the bearing mechanism 3 so that the retaining portion 631 of the retaining member 6 and the flange portion 321a of the bush 32 face each other in the vertical direction.

  The rotating portion 4 descends toward the bearing mechanism 3, and the retaining portion 631 contacts the flange portion 321a. The retaining portion 631 is elastically deformed, and when the rotating portion 4 is further lowered, the retaining portion 631 returns to its original shape due to the restoring force, and the retaining portion 631 is positioned close to the lower portion of the flange portion 321a.

  As described above, the rotating part 4 and the stationary part 2 are assembled via the bearing mechanism 3 (step S7).

  As described above, in the motor 1, the upper fixing portion 62 is caulked on the upper surface of the disk mounting portion 411 of the lid portion through-hole 81 while the lower fixing portion 61 is in contact with the lower surface of the disk mounting portion 411. Make contact. Accordingly, the retaining member 6 can be easily and firmly fixed to the disk mounting portion 411 with a simple structure. As a result, automation of manufacturing the motor 1 is easily realized.

  In the retaining member 6, the retaining peripheral portions 611 a to 611 c and the upper projecting portion 621 extend radially outward from the lower projecting portion 63, and the retaining portion 631 projects radially inward from the lower projecting portion 63. When the motor 1 is driven, the rotating portion 4 moves upward and the retaining portion 631 comes into contact with the flange portion 321a, so that not only a downward force but also a radially outward force acts on the retaining portion 631. Even so, forces that push against each other act between the retaining peripheral portions 611a to 611c and the lower surface of the disk mounting portion 411. For this reason, it is prevented that the lower protrusion part 63 inclines and the retaining part 631 moves to radial direction outward.

  Furthermore, since the upper protruding portion 621 is press-fitted into the through hole forming portion 8, it is possible to prevent radial play between the lid portion through hole 81 and the upper protruding portion 621. As described above, when the retaining portion 631 receives a force directed outward in the radial direction, a pressing force acts between the retaining peripheral portions 611a to 611c and the lower surface of the disk mounting portion 411. A radial frictional force is also generated. As a result, the lower protrusion 63 and the upper protrusion 621 are restrained from moving in the radial direction at two upper and lower positions. Even if a force directed radially outward is applied to the retaining part 631, the lower protrusion 63 and It can prevent more reliably that the upper protrusion part 621 inclines.

  As described above, in the motor 1, it is possible to more reliably prevent the retaining member 6 from coming off with a simple structure in which the through hole forming portion 8 is provided with the inner contact portion 811 and the outer contact portion 813.

  Since the lower fixing portion 61 connects the lower projecting portion 63 in a ring shape on the outer side in the radial direction than the retaining portion 631, the inclination of the lower projecting portion 63 can be more effectively prevented with a simple structure. Since the retaining member 6 is annular, the retaining member 6 can be easily handled in the work of fixing the retaining member 6 to the disk mounting portion 411.

  In the through hole forming portion 8, the upper protruding portion 621 is fixed at three points because the shape of the lid through hole 81 when viewed in plan is V-shaped. As described above, it is possible to stably prevent the radial movement of the upper protruding portion 621 in the lid through-hole 81 while making the lid through-hole 81 simple. By using the V-shaped through-hole forming portion 8, the radial direction of the lid portion through-hole 81 in order to press-fit the upper protruding portion 621 into the through-hole forming portion 8 as compared with the rectangular through-hole forming portion. It is not necessary to make the width of the extremely small. Further, it is not necessary to increase the plate thickness of the retaining member 6, and it is possible to easily prevent the retaining member 6 from interfering with other members of the motor 1. By providing the upper protruding portion 621 with the protruding portion 623 that protrudes toward the inner contact portion 811, a sufficient press-fitting allowance in the lid portion through-hole 81 can be ensured, and the upper protruding portion 621 is inserted into the through-hole. It can be stably fixed to the forming portion 8.

  Furthermore, since both the upper fixing portion 62 and the lower fixing portion 61 are directed radially outward, the retaining member 6 can be firmly fixed by the disk mounting portion 411.

  In the rotating part 4, since the upper protruding part 621 is provided between the claw members 52 of the chucking device 5 in the circumferential direction, the claw member that is in sliding contact with the upper surface of the disk mounting part 411 when the recording disk 9 is attached. 52 is prevented from interfering with the upper protrusion 621. Thus, in the motor 1, it is not necessary to consider the interference between the claw member 52 and the retaining member 6, the design of the motor 1 becomes easy, and the chucking device 5 becomes thicker in the direction of the central axis J1. Is prevented. Since the stator 22 is fixed to the bush 32 via the stator holding member 23, the shape of the stator core 221 is simplified as compared with the case where the stator core 221 is directly fixed to the bush 32.

  In the motor 1, the lower fixing portion 61 is provided on the outer side in the radial direction from the lower projecting portion 63, so that the arrangement space of the lower fixing portion 61 is reduced as compared with the case where the lower fixing portion 61 is located in the vicinity of the bearing mechanism 3. Can be secured. The position of the flange portion 321 a is positioned below the upper end 222 a of the coil 222. For this reason, the preload magnet 43 can be provided between the bush 32 and the disk mounting portion 411 without increasing the motor 1 in the direction of the central axis J1. Since the preload magnet 43 magnetically acts on the flange portion 321a, it is not necessary to separately provide a magnetic member in the bearing mechanism 3. As a result, the number of parts is reduced. In the rotating unit 4, the preload magnet 43 is provided on the rotor yoke 41 without using an adhesive. This facilitates automation of manufacturing the motor 1. In the bearing mechanism 3, the upper portion 331 of the sleeve 33 protrudes from the bush 32, so that a distance between the upper end and the lower end of the bearing surface that is the inner surface 332 of the sleeve 33 is secured.

  In the first embodiment, a drop-off prevention portion 64 is provided between the lower protrusions 63 in the circumferential direction. For this reason, the drop-off prevention part 64 is molded easily and accurately as compared with the case where the drop-off prevention part is provided in the lower protruding part 63. By providing the inclined portion 621a in the upper protruding portion 621, even when the retaining member 6 is fixed to the disk mounting portion 411, the upper protruding portion 621 and the lid portion through hole 81 are slightly displaced in the axial direction. The upper protruding portion 621 can be easily inserted into the lid portion through-hole 81.

  Furthermore, in the cover part through-hole 81, the cross section of the lower edge 414b is smoothly convex, that is, the lower edge 414b is smoothly curved toward the inside of the cover part through-hole 81. As a result, when the upper protrusion 621 of the retaining member 6 is inserted into the lid through-hole 81, the allowable deviation of the upper protrusion 621 with respect to the lid through-hole 81 can be increased, and the upper protrusion 621 can be easily inserted into the cover part through-hole 81. As a result, the automation of manufacturing the motor 1 can be realized more easily.

  In the stationary portion 2, the stator holding member 23 is positioned below the upper end of the stator 22, that is, the upper end 222 a of the coil 222 in a direction parallel to the central axis J <b> 1. For this reason, the length of the lower protrusion part 63 extended toward the stator holding member 23 is fully ensured. Thereby, at the time of the assembly of the rotating part 4 and the stationary part 2, the retaining part 631 can be inserted below the flange part 321a while sufficiently bending the lower protruding part 63. In the retaining member 6, the retaining portion 631 is positioned below the upper end of the stator 22 between the stator 22 and the bush 32, so that the retaining can be performed without increasing the motor 1.

  In the motor 1, the retaining member 6 is fixed to the disk mounting portion 411 without using an adhesive, so that the number of assembling steps of the motor 1 is reduced. In addition, as compared with the technique of fixing the retaining member 6 by welding, scattering of granular molten metal, so-called welding balls, is prevented during welding. The appearance inspection eliminates the need to confirm the presence or absence of a weld ball.

  In the motor 1, compared to a motor having a structure in which the retaining member is retained in the bearing mechanism, the shaft and bushing necessary for attaching the retaining member are not required, and the manufacturing cost is reduced. A reduction in the axial length of the sleeve is also prevented.

  FIG. 19 is a diagram illustrating another example of the retaining member. In the retaining member 6, the tip end portion 621b of the upper protruding portion 621 is thinner than the lower portion 621c. In the circumferential direction, the width of the distal end portion 621b is sufficiently smaller than the width between the two side portions 814 extending substantially in the radial direction in the edge portion 80 of the through hole forming portion 8 shown in FIG. When fixing the retaining member 6 to the disk mounting portion 411, the tip 621b of the upper projecting portion 621 is passed through the space between the two side portions 814 of the lid portion through-hole 81, and the disk mounting portion 411 moves up. A lower portion 621c of the upper protruding portion 621 is press-fitted into the through hole forming portion 8. In the retaining member 6, the tip portion 621 b of the upper projecting portion 621 is thin, so that the tip portion 621 b is not press-fitted into the through-hole forming portion 8, or the degree of press-fitting is reduced, making it easier to insert the upper projecting portion 621. It can be carried out.

  FIG. 20 is a diagram illustrating another example of the through hole forming portion. The lid portion through-hole 81 includes a U-shaped central portion 82 that is convex outward in the radial direction when viewed from above. Exactly, it is a shape which has the site | part which spreads in the circumferential direction on both sides of the circumferential direction of a U-shaped site | part. In the through-hole forming portion 8 a, a portion 821 that protrudes radially outward on the radially inner side of the central portion 82 is an inner contact portion that comes into contact with the protruding portion 623 of the upper protruding portion 621 in the radial direction. In addition, the outer contact where the portions 83 located on both sides of the recessed portion 822 that is recessed radially outward on the radially outer side of the central portion 82 is in contact with the radially outer portion of the upper protruding portion 621 in the radial direction. Part.

  By making the center part 82 of the lid part through-hole 81 into a substantially U shape, the upper projecting part 621 is fixed at three points. Thus, in the through hole forming portion 8a, the radial movement of the upper protruding portion 621 can be prevented with a simple structure.

  FIG. 21 is a diagram illustrating another example of the retaining member. A part 622 bent in a V shape so as to protrude radially inward is provided on a part of the upper protrusion 621 of the retaining member. Hereinafter, the region 622 is referred to as a “bent portion 622”. The through hole forming portion 8b is rectangular in plan view. In the through-hole forming portion 8b, the intermediate portion 624 located on the radially inner side of the bent portion 622 abuts on the radially inner portion 841 in the edge portion 84 of the through-hole forming portion 8b in the radial direction. That is, the portion 841 is an inner contact portion that comes into contact with the radially inner portion of the bent portion 622. The end portions 625 on both sides of the intermediate portion 624 abut on the radially outer portion 842 of the edge portion 84 in the radial direction. That is, the portion 842 is an outer contact portion that comes into contact with a radially outer portion of the bent portion 622. Thereby, the radial position of the upper protrusion 621 is fixed. In the retaining member, the bent portion 622 is stably fixed by the two outer contact portions and the inner contact portion positioned between the two outer contact portions in the circumferential direction.

(Second Embodiment)
FIG. 22 is a diagram illustrating a part of the motor according to the second embodiment. In the motor according to the second embodiment, the stator core 221 is provided with a protruding portion 221b that slightly protrudes radially inward. In the retaining member 6, a retaining portion 631 that protrudes radially outward is provided at the lower portion of the lower projecting portion 63. The retaining portion 631 is located close to the lower portion of the protruding portion 221b. The upper protruding portion 621 is bent inward in the radial direction and abuts on the upper surface of the disk mounting portion 411. The upper protrusion 621 includes a protrusion 626 that protrudes radially outward. The upper protruding portion 621 is press-fitted into the through hole forming portion 8c at a position where the protruding portion 626 is provided.

  The lower fixing portion 61 is provided with a retaining peripheral portion 611 d that extends radially inward from the lower protruding portion 63. That is, the retaining peripheral portion 611d is located on the opposite side of the retaining portion 631 with respect to a virtual plane perpendicular to the radial direction at the position of the lower protrusion 63. The lower fixing portion 61 contacts the lower surface of the preload magnet 43 that contacts the lower surface of the disk mounting portion 411, that is, indirectly contacts the lower surface of the disk mounting portion 411 via the preload magnet 43.

  As shown in FIG. 23, the shape when the lid portion through-hole 81 of the disk mounting portion 411 is planarized is a V-shape that is convex toward the right side in FIG. 23, that is, radially inward. In the through-hole forming portion 8 c, two portions 852 located on both sides of the recessed portion 851 that is recessed radially inward on the radially inner side of the edge portion 80 are radially inward of the upper protruding portion 621. Touch the part. Hereinafter, the region 852 is referred to as an “inner contact portion 852”. In addition, a portion 853 that protrudes radially inward on the radially outer side of the edge portion 80 comes into contact with a protruding portion 626 that is a radially outer portion of the upper protruding portion 621. Hereinafter, the portion 853 is referred to as an “outer contact portion 853”. In the circumferential direction, the outer contact portion 853 is located between the two inner contact portions 852. The upper projecting portion 621 is sandwiched between the inner contact portion 852 and the outer contact portion 853, so that the upper projecting portion 621 is pressed into the through hole forming portion 8c, and the radial position is fixed. The other structure of the motor according to the second embodiment is the same as that of the first embodiment. In the following description, the same components are denoted by the same reference numerals.

  In the motor according to the second embodiment, as shown in FIG. 22, the retaining portion 631 is located close to the lower portion of the protruding portion 221 b that is a part of the stationary portion 2, thereby preventing the rotating portion 4 from coming off. Done. When the motor is driven, the stator core 221 and the retaining portion 631 come into contact with each other, and even if a force directed radially inward acts on the retaining portion 631, the retaining peripheral portion 611d and the preload magnet 43 are pressed against each other. When the force acts, the lower protrusion 63 and the upper protrusion 621 are prevented from being inclined.

  Further, as the upper protruding portion 621 is press-fitted into the through-hole forming portion 8c, the lower protruding portion 63 and the upper protruding portion 621 are restrained in the radial direction at two upper and lower positions as in the first embodiment, and the lower protruding portion The inclination of the part 63 and the upper protrusion part 621 can be prevented more reliably. As a result, it is more reliably prevented that the retaining portion 631 is detached from the stator 22. In the upper projecting portion 621, a protrusion 623 that protrudes toward the outer contact portion 853 shown in FIG. 23 is provided, so that a press-fitting allowance in the lid portion through-hole 81 can be sufficiently secured.

  In 2nd Embodiment, the thing of the shape which reversed the cover part through-hole 81 shown in FIG. 20 to right and left may be provided as a cover part through-hole. That is, a lid through hole including a U-shaped portion that protrudes radially inward in plan view may be provided.

(Third embodiment)
FIG. 24 is a cross-sectional view of a motor according to the third embodiment. 25 is a cross-sectional view of the vicinity of the through-hole forming portion 8 shown in FIG. 24 taken along a plane perpendicular to the central axis J1. In the motor according to the third embodiment, a retaining member 6a molded with resin is provided. The structure other than the retaining member 6a is the same as that of the first embodiment. In the following description, the same components are denoted by the same reference numerals.

  The retaining member 6 a includes a plate-like upper protrusion 627. The width in the circumferential direction of the tip end portion 627a of the upper protruding portion 627 shown by a two-dot chain line in FIG. Other shapes of the retaining member 6a are the same as those of the retaining member 6 of the motor 1 according to the first embodiment.

  When the upper protrusion 627 is inserted into the lid through-hole 81, the tip 627a moves upward in the lid through-hole 81 while being elastically deformed in the circumferential direction. When the tip end portion 627 a moves above the disk mounting portion 411, it returns to its original shape and engages with the upper surface of the disk mounting portion 411. Further, the lower portion 627 b of the upper protruding portion 627 is press-fitted into the through hole forming portion 8.

  In the motor, even if a radially outward force is applied to the retaining portion 631 shown in FIG. 24, the contact between the retaining peripheral portion 611 e of the lower fixing portion 61 and the disk mounting portion 411, and the upper protruding portion 621. By press-fitting into the through-hole forming part 8, the inclination of the lower protruding part 63 and the upper protruding part 627 is prevented. The portion of the upper projecting portion 627 that is elastically deformed when inserted into the lid through-hole 81 may be another portion, and once the elastically deformed portion returns to its original shape, the axial direction of the retaining member 6a is restored. The snap-fit structure that is an engagement structure that restricts movement may be provided in various manners.

(Fourth embodiment)
FIG. 26 is a diagram illustrating a motor according to the fourth embodiment. In the recording disk drive apparatus on which the motor 1a is mounted, the recording disk 9 is inserted into the housing in a state of being placed on a movable tray provided in the housing of the recording disk drive apparatus, and from the housing. It is taken out.

  In the center of the upper part of the disk mounting part 411, a disk holding part 5a is provided by resin injection molding. The disk holding part 5a has a plurality of claws 55 extending downward from the upper outer peripheral part. Further, in the circumferential direction, a notch portion 56 is provided between the plurality of claws 55 at the lower portion of the disc holding portion 5a. The disk holding portion 5a is further provided with a clamp magnet 57 and a clamp yoke 58. In the rotating part 4, the upper projecting part 621 of the retaining member 6 is provided at a position overlapping the notch part 56 and the direction parallel to the central axis J <b> 1. The other structure of the motor 1a is the same as that of the motor 1 of FIG.

  When the recording disk 9 is inserted into the recording disk drive device, the central hole 91 of the recording disk 9 is disposed above the disk holding portion 5a of the motor 1a. At the same time, the motor 1 a is raised and the disc holding portion 5 a is fitted into the central hole 91 of the recording disc 9. Further, the recording disk 9 is clamped between the disk mounting portion 411 and the clamper 13 by the clamp magnet 57. At this time, the central hole 91 of the recording disk 9 and the claw 55 are in contact with each other, and the claw 55 is elastically deformed radially inward. In the disk holding portion 5a, the center of the recording disk 9 can be accurately positioned on the central axis J1 by utilizing the elastic deformation of the claw 55.

  Also in the motor 1a, the upper fixing portion 62 is brought into contact with the upper surface of the disk mounting portion 411 by caulking while the lower fixing portion 61 is in contact with the lower surface of the disk mounting portion 411. Accordingly, the retaining member 6 can be easily and firmly fixed to the disk mounting portion 411 with a simple structure.

  In the motor 1a, as in the first embodiment, even if a force directed radially outward acts on the retaining portion 631, the retaining peripheral portion 611f and the upper projecting portion 621, and the upper and lower surfaces of the disk mounting portion 411 And the lower protrusion 63 and the upper protrusion 621 are prevented from inclining by press-fitting the upper protrusion 621 into the through-hole forming portion 8. The same applies to other embodiments below.

(Fifth embodiment)
FIG. 27 is a plan view of the retaining member 6 and the flange portion 321a of the motor according to the fifth embodiment. The flange portion 321a has a portion 711 having a small width in the radial direction. Hereinafter, the part 711 is referred to as a “narrow part 711”. Further, a portion where the width in the radial direction of the flange portion 321a is larger than the narrow portion 711 is referred to as a “wide portion 712”. By providing the narrow portion 711, the shape of the flange portion 321a when viewed in plan is asymmetric with respect to the central axis J1.

  The radius of the radially outer edge of the narrow portion 711 is smaller than the distance from the central axis J1 to the tip of the retaining portion 631. Other shapes of the bush 32 are the same as the bush 32 of the motor 1 according to the first embodiment. Other structures of the motor are the same as those of the motor 1. In the following description, when distinguishing the three retaining portions 631, they are referred to as “first to third retaining portions 631 a to 631 c” in the counterclockwise direction from the lower right in FIG. 27.

An angle θ ₁ centered on the central axis J1 corresponding to the range in which the narrow portion 711 exists in the circumferential direction (hereinafter simply referred to as “the angle θ ₁ of the narrow portion 711”) is the first angle of the first retaining portion 631a. The angle is larger than the counterclockwise angle θ ₂ centering on the central axis J1 from the end 651 on the third retaining portion 631c side toward the end 652 on the third retaining portion 631c side of the second retaining portion 631b. To be precise, the end 651 on the third retaining portion 631c side of the first retaining portion 631a refers to the end 651 on the third retaining portion 631c side of the portion overlapping the wide portion 712 of the first retaining portion 631a. The same applies to the end 652 on the third retaining portion 631c side of the second retaining portion 631b.

Furthermore, the angle θ ₁ of the narrow portion 711 is the center from the end 651 on the third retaining portion 631c side of the first retaining portion 631a toward the end portion 653 on the first retaining portion 631c side of the third retaining portion 631c. It is smaller than the counterclockwise angle θ ₃ centering on the axis J1. Since the angle θ ₁ of the narrow portion 711 is in the above range, any one of the first to third retaining portions 631a to 631c is always outside the narrow portion 711 when the motor 1 rotates. Exists. In addition, at least a part of each of the remaining two is located below the wide portion 712 in a direction parallel to the central axis J1.

  In the motor 1, when the rotating part 4 shown in FIG. 28 moves upward, the two retaining parts 631 come into contact with the wide part 712 of the flange part 321a. The other one retaining portion 631 is located outside the narrow portion 711 and does not contact the flange portion 321a. As shown in FIG. 27, since the three retaining portions 631 are provided at equal intervals in the circumferential direction, the contact position where the wide portion 712 and the two retaining portions 631 abut is 180 around the central axis J1. It exists in the range which is less than degree. As described above, when the range where the contact position exists, that is, the range where the upward movement of the rotating portion 4 is restricted by the retaining member 6 is less than 180 degrees, the portion near the narrow portion 711 of the retaining member 6. As a result, the entire rotating part 4 is slightly inclined.

  As a result, the shaft 31 shown in FIG. 28 strongly contacts the inner surface 332 of the sleeve 33. A frictional force is generated between the shaft 31 and the sleeve 33. Thereby, in the motor 1, the removal force which is a force required in order to isolate | separate the retaining member 6 from the bush 32 can be increased.

  On the other hand, when the motor 1 is assembled, as shown in FIG. 29, when the shaft 31 is inserted into the sleeve 33, the rotating portion 4 is fixed by a jig so that the central axis J1 is accurately oriented in the vertical direction. In this state, the rotating part 4 is pushed downward. At this time, one retaining portion 631 among the three retaining portions 631 passes through the narrow portion 711 in a non-contact manner.

  Incidentally, as shown in FIG. 28, in the flange portion 321 a of the bush 32, since the radial width of the narrow portion 711 is smaller than that of the wide portion 712, the circumferential direction between the preload magnet 43 and the narrow portion 711. The magnetic attraction force per unit length is smaller than the magnetic attraction force between the preload magnet 43 and the wide portion 712. During the rotation of the motor 1, a so-called side pressure is generated between the flange portion 321 a and the preload magnet 43, which is a force for inclining the shaft 31 toward the wide portion 712 side. In particular, when the motor 1 rotates at a low speed, a state in which the shaft 31 is inclined in a certain direction with respect to the stationary portion 2 is maintained by the side pressure. Thereby, the runout of rotation of the motor 1 at the time of low speed rotation is prevented.

  As described above, the fifth embodiment has been described. In the motor having the structure in which the preload magnet is provided in the rotating portion, the preload magnet rotates. For example, only a half of the preload magnet is magnetized, or the shape of the preload magnet is set. Even if is changed in the circumferential direction, the shaft 31 cannot be inclined in a certain direction. On the other hand, in the motor 1, the radial width of the flange portion 321 a changes in the circumferential direction. In other words, the radial width of the flange portion 321 a is not constant in the circumferential direction. It is possible to easily generate a lateral pressure that is inclined to the angle.

  Further, by causing the contact position between the retaining portion 631 and the flange portion 321a to be unevenly distributed within a range of less than 180 degrees, a so-called tipping moment that tilts the shaft 31 when an upward force is applied to the rotating portion 4 is applied. Occurs. As a result, the removal force can be increased and the insertion / extraction ratio can be improved. In the motor 1, the force required when the shaft 31 is inserted into the sleeve 33 can be reduced by improving the insertion / extraction ratio. Hereinafter, this force is referred to as “insertion force”.

  By reducing the insertion force, when the shaft 31 is inserted into the sleeve 33, the impact of the shaft 31 on the thrust plate 35 is reduced, and damage to the thrust plate 35 is prevented. The impact on the bottom portion 322 of the bush 32 is also reduced, and the rotation of the shaft 31 due to the deformation of the bottom portion 322 is prevented. Furthermore, the impact on each member of the rotation part 4 at the time of insertion is also reduced. Moreover, the influence on the assembly accuracy of each member of the motor 1 is also reduced. As a result, the productivity of the motor 1 is improved.

  In the fifth embodiment, four or more retaining portions 631 may be provided on the retaining member 6. Also in this case, the range in the circumferential direction of the narrow portion 711 is set so that at least two retaining portions 631 are positioned outside the narrow portion 711. Accordingly, when the shaft 31 is inserted into the sleeve 33, at least two retaining portions 631 pass through the flange portion 321a without contact. In addition, even if there is only one retaining portion 631 located outside the narrow portion 711, a lateral pressure can be obtained.

  Further, the wide portion 712 is designed so as to overlap only the retaining portion 631 existing in a range of less than 180 degrees with the central axis J1 as the center. When an upward force is applied to the rotating part 4, the wide part 712 comes into contact with only a part of the plurality of retaining parts 631. The rotating part 4 is slightly inclined, and a frictional force is generated between the shaft 31 and the sleeve 33. Thereby, extraction force can be increased and insertion / extraction ratio can be improved.

  FIG. 30 is a plan view showing another example of the bush 32. In FIG. 30, the preload magnet 43 is indicated by a two-dot chain line. In a plan view, the outer edge 72 that is the radially outer edge of the flange portion 321 a includes a first outer edge 721 and a second outer edge 722. The first outer edge 721 has an arc shape centered on the central axis J1. The second outer edge 722 is a straight line connecting both ends of the first outer edge 721. The flange portion 321a is easily manufactured at low cost by press working.

  In the flange portion 321 a, the width in the radial direction between the inner edge 73, which is a radially inner edge, and the second outer edge 722 becomes smaller toward the center of the second outer edge 722. For this reason, the magnetic attractive force per unit length in the circumferential direction between the flange portion 321 a and the preload magnet 43 is the smallest in the vicinity of the center of the second outer edge 722. When the motor 1 rotates, a side pressure is generated such that the shaft 31 is inclined to the opposite side of the flange portion 321a from the second outer edge 722. In particular, when the motor 1 rotates at a low speed, the state where the shaft 31 is inclined in a certain direction is maintained. As a result, similarly to the motor 1 shown in FIG. 28, runout of the rotation of the motor 1 during low-speed rotation is prevented.

(Sixth embodiment)
FIG. 31 is a view showing the retaining member 6 of the motor according to the sixth embodiment. In FIG. 31, the flange portion 321a of the bush 32 is indicated by a two-dot chain line. In the retaining member 6, the third retaining portion 631 c is omitted from the first to third retaining portions 631 a to 631 c of the retaining member 6 in FIG. 27, and the shape of the retaining member 6 when viewed in plan is related to the central axis J <b> 1. Asymmetric. In the retaining member 6, the retaining portion 631 exists within a range of less than 180 degrees centered on the central axis J1. Other shapes of the retaining member 6 are the same as those of the retaining member 6. Other structures of the motor according to the sixth embodiment are the same as those of the first embodiment.

  When an upward force is applied to the rotating part 4 in FIG. 2, the retaining member 6 rotates so that the part where the retaining part 631 is not provided, that is, the lower left part in FIG. 31 is directed upward in the direction of the central axis J1. The entire part 4 is slightly inclined. The shaft 31 shown in FIG. 3 is in contact with the inner surface 332 of the sleeve 33 and generates a frictional force. Thereby, extraction force can be increased and insertion / extraction ratio can be improved. As a result, it is possible to design to reduce the insertion force.

  In the sixth embodiment, the number of retaining portions 631 may be a number other than two. Since the at least one retaining portion 631 exists in a range of less than 180 degrees around the central axis J1 below the flange portion 321a, the rotating portion 4 can be inclined. In the fifth embodiment, when an upward force is applied to the rotating portion 4, all the retaining portions 631 always come into contact with the flange portion 321a, so that the removing force can be made constant. In the retaining member 6, the unevenness of the weight of the retaining member 6 may be prevented by increasing the width in the radial direction of the portion where the retaining portion 631 is not provided.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible.

  In the above embodiment, the upper protrusion 621 of the retaining member 6 is not necessarily in contact with the upper surface of the disk mounting portion 411, and the retaining member 6 is in contact with the upper edge of the lid through hole 81. The mounting unit 411 may be fixed. Further, as shown in FIG. 32, the upper protruding portion 621 is recessed while avoiding contact with the upper edge of the lid portion through-hole 81 by recessing a part of the surface of the upper protruding portion 621 facing the disk mounting portion 411. 621 may be brought into contact with the upper surface of the disk mounting portion 411.

  In the first embodiment, when other parts of the motor 1 are fixed to the upper surface of the disk mounting portion 411, the upper projecting portion 621 abuts the disk indirectly by contacting the part from above. You may contact | abut on the upper surface of the mounting part 411. FIG. The same applies to the second, fourth to sixth embodiments. If the retaining member 6 is firmly fixed to the disk mounting portion 411 by being press-fitted into the through hole forming portion, the portion of the upper projecting portion 621 located above the disk mounting portion 411 is omitted. Good.

  In the retaining member, the shape of the portion that is press-fitted into the through-hole forming portion of the upper protruding portion can be appropriately changed according to the shape of the lid through-hole. For example, as shown in FIG. 33, a part of the upper protruding portion 621 is bent so as to be inclined with respect to the radial direction in a plane perpendicular to the central axis J1, thereby press-fitting into the rectangular through-hole forming portion 8d. May be. In this case, in the through-hole forming portion 8d, the radially inner portion 861 of the edge portion 80 comes into contact with the radially inner portion of the upper protruding portion 621 at one point. That is, one inner contact portion is provided in the portion 861. The radially outer portion 862 of the edge portion 80 contacts the radially outer portion of the upper protrusion 621 at one point. That is, one outer contact portion is provided in the portion 862. As described above, in the motor, at least one outer contact portion and at least one inner contact portion are provided at different positions in the circumferential direction of the through hole forming portion, thereby fixing the retaining member within the lid portion through hole. be able to.

  The shape of the lid through hole may be variously changed. In order to fix the radial position of the upper protrusion 621 at three points, the lid through-hole preferably includes a V-shaped or U-shaped portion that is convex in the radial direction. In addition, V shape and U shape refer to the shape bent or curved with respect to the circumferential direction, and mean that the thing which is linear throughout is excluded.

  In the second embodiment, the retaining portion 631 and the protruding portion when the upward force is applied to the rotating portion 4 by changing the distance between the distal end portion of the protruding portion 221b and the central axis J1 in the circumferential direction. It is good also considering the contact position between 221b as the range below 180 degree | times. Thereby, the rotation part 4 inclines and the extraction force can be increased by the frictional force generated between the shaft 31 and the sleeve 33. Moreover, you may make the rotation part 4 incline by providing the retaining part 631 in the range below 180 degree | times.

  In the first embodiment, the inclined portion 621a of the upper protruding portion 621 shown in FIG. 15 may be inclined outward in the radial direction while heading upward. In this case, when the retaining member 6 is inserted into the lid through-hole 81 of the disk mounting portion 411, the inclined portion 621a moves upward while being in sliding contact with the radially inner portion of the lower edge 414b. And the position of the radial direction of the retaining member 6 is fixed when the lower part 621c of the upper protrusion part 621 and the site | part inside the radial direction of the some cover part through-hole 81 contact | abut.

  In the above embodiment, as shown in FIG. 34, the stator holding member 23 is omitted, and a part of the inner end of the stator core 221 is protruded radially inward, so that the stator core 221 is disposed on the outer periphery of the bush 32. It may be fixed directly.

  The number of the upper protrusions 621 and the lower protrusions 63 may be other than three. Preferably, three or more lower protrusions 63 are provided at approximately equal intervals in the circumferential direction in order to prevent the preload magnet 43 from moving in the radial direction.

  Further, the upper protruding portion 621 and the lower protruding portion 63 may have different numbers. In this case, in the first embodiment, any one of the upper protrusions 621 may be located at the same position in the circumferential direction as any one of the lower protrusions 63. The same applies to the second to sixth embodiments.

  In the above embodiment, the preload magnet 43 may be provided on the upper surface of the flange portion 321a. That is, a magnetic action may occur between the preload magnet 43 and the disk mounting portion 411 while using the flange portion 321a as a yoke. In other words, in the motor 1, at least one of the disk mounting portion 411 and the bush 32 is formed of a magnetic material, and the preload magnet 43 is provided at a position facing the other one. Thereby, it is not necessary to separately provide a magnetic member at a position facing the preload magnet 43.

  The preload magnet 43 may be provided at a position farther from the central axis J1 than the position shown in FIG. In this case, the preload magnet 43 generates a magnetic action with the stationary portion 2, for example, with the stator core 221. In the rotor yoke 41, the recording disk 9 is indirectly mounted on the disk mounting portion 411 via the annular rubber 44, but the annular rubber 44 is omitted and the recording disk 9 is directly mounted on the upper surface of the disk mounting portion 411. May be placed.

  In the above embodiment, by providing the thrust plate 35, a resin layer is formed between the inner bottom surface of the bottom portion 322 of the bush 32 and the tip end of the shaft 31, but the inner bottom surface of the bottom portion 322 and the tip end of the shaft 31 are formed. A resin layer may be formed by coating at least one with resin.

  In the above embodiment, even if the upper end of the bush 32 is located at the same position as the upper end of the stator 22, the bush 32 and the disk mounting portion 411 are not enlarged without increasing the motor 1 in the direction of the central axis J1. A preload magnet 43 can be arranged between them. The chucking device 5 may have a structure in which the claw member 52 moves only in one of the vertical direction and the radial direction.

  If each of the plurality of lid part through-holes 81 is arranged between any of the plurality of claw members 52 in the circumferential direction, the lid part through-holes 81 and the claw members 52 are not necessarily present alternately in the circumferential direction. do not have to. Even when the claw member 52 is not in sliding contact with the disk mounting portion 411, the claw member 52 and the upper projecting portion 621 are formed by arranging the lid through holes 81 between the claw members 52 in the circumferential direction. Can be easily prevented. The motor 1 may be an inner rotor type in which a rotor magnet is disposed inside a stator. In addition, a disc mounting portion may be separately provided on the upper side of the rotor yoke. The method of fixing the retaining members 6 and 6a to the rotor yoke 41 may be applied to other motors such as a geared motor.

  The configurations in the above embodiment and each modification may be appropriately combined as long as they do not contradict each other.

  The present invention is particularly suitable as a thin motor for a recording disk drive. However, the present invention is not limited to this, and the present invention can also be used as a motor other than the recording disk drive device such as a fan motor.

DESCRIPTION OF SYMBOLS 1,1a Motor 2 Static part 3 Bearing mechanism 4 Rotating part 5 Chucking device 6, 6a Retaining member 8a-8d Through-hole formation part 9 Recording disk 10 Recording disk drive device 11 Access part 12 Housing 41 Rotor yoke 52 Claw member 61 Lower fixing Portion 63 Lower projection 69 Original member (prevention member) 81 Lid through-hole 82 Center 83, 813, 842, 853, 862 Outer contact 91 Central hole 92 Virtual surface 221b Projection 321a (stator core) Flange 411 Disc mounting portion 611 Contact portion 611a to 611f Stopper peripheral portion 621 Upper protrusion 621b, 627a (Upper protrusion) tip 623, 626 Protrusion 631, 631a to 631c Stopper 811, 821, 841, 852, 861 Inner contact part J1 Central axis

Claims (11)

A stationary part;
A bearing mechanism;
A rotating part supported above the stationary part by the bearing mechanism and supported to be rotatable about a central axis with respect to the stationary part;
With
The rotating part is
A substantially cylindrical rotor yoke with a lid;
A retaining member fixed to the lid of the rotor yoke and preventing separation of the rotating part from the stationary part;
With
The retaining member is a continuous member,
The retaining member is
A lower fixing portion that directly or indirectly contacts the lower surface of the lid portion;
A plurality of lower protrusions protruding downward from the lower fixing portion;
A plurality of upper protrusions protruding upward from the plurality of lower protrusions and inserted into a plurality of lid through holes formed in the lid;
A plurality of retaining portions projecting radially inward or outward at a lower portion of the plurality of lower projecting portions, and positioned close to the lower portion of the stationary portion or the bearing mechanism;
With
The lower fixing portion has a portion located on the opposite side to the retaining portion provided at the lower portion of each lower protrusion with respect to a virtual plane perpendicular to the radial direction at the position of each lower protrusion,
A through-hole forming part that forms each lid part through-hole,
At least one outer contact portion that contacts a radially outer portion of the upper protrusion to be inserted;
At least one inner contact portion that contacts a radially inner portion of the upper protrusion at a position different from the at least one outer contact portion in the circumferential direction;
Including a motor.   The number of the at least one outer contact portion is 2, the number of the at least one inner contact portion is 1, and one inner contact portion is located between the two outer contact portions in the circumferential direction; or The number of the at least one inner contact portion is 2, the number of the at least one outer contact portion is 1, and one outer contact portion is located between two inner contact portions in the circumferential direction. Item 4. The motor according to Item 1. The upper protrusion is plate-shaped,
The motor according to claim 2, wherein each lid portion through hole includes a V-shaped or U-shaped portion that protrudes radially inward or outward when viewed in plan.   4. The motor according to claim 3, wherein an upper protruding portion inserted into each lid portion through-hole includes a protruding portion that protrudes toward the one inner contact portion or the one outer contact portion.   The motor according to any one of claims 2 to 4, wherein a portion of each upper projecting portion located above the lid portion is bent radially inward or radially outward.   The motor according to claim 5, wherein a width in a circumferential direction of a tip portion of each of the upper protruding portions is smaller than a width of a portion in the lid portion through hole.   The motor according to claim 1, wherein the plurality of retaining portions protrude radially inward.   The motor according to claim 7, wherein the lower fixing portion connects the plurality of lower projecting portions in a ring shape at a radially outer side than the plurality of retaining portions. The original member of the retaining member is a member obtained by punching a plate member by pressing,
In the original member, the upper protrusion and the lower protrusion are arranged in the radial direction,
The motor according to claim 8, wherein the lower protruding portion is bent downward from the main body portion of the original member so that the upper protruding portion faces upward. A chucking device provided at the upper part of the rotating part and fitted in the central hole of the recording disk;
The lid extends around the chucking device, and the recording disk is placed directly or indirectly on the lid;
The chucking device includes a plurality of claw members that are arranged in a circumferential direction and that fix the recording disk on the lid portion by moving a tip in a vertical direction or a radial direction,
The motor according to claim 1, wherein each of the lid through holes is disposed between the plurality of claw members in a circumferential direction. The motor according to any one of claims 1 to 10, wherein the recording disk is rotated;
An access unit for reading and / or writing information to and from the recording disk;
A housing for housing the motor and the access unit;
A recording disk drive device comprising:

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