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WO2011099370A1 - Sous-ensemble d'un dispositif d'entraînement de disque - Google Patents

Sous-ensemble d'un dispositif d'entraînement de disque Download PDF

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Publication number
WO2011099370A1
WO2011099370A1 PCT/JP2011/051545 JP2011051545W WO2011099370A1 WO 2011099370 A1 WO2011099370 A1 WO 2011099370A1 JP 2011051545 W JP2011051545 W JP 2011051545W WO 2011099370 A1 WO2011099370 A1 WO 2011099370A1
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WO
WIPO (PCT)
Prior art keywords
hub
shaft
disk drive
drive device
sub
Prior art date
Application number
PCT/JP2011/051545
Other languages
English (en)
Japanese (ja)
Inventor
寛 齋藤
Original Assignee
アルファナテクノロジー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アルファナテクノロジー株式会社 filed Critical アルファナテクノロジー株式会社
Priority to JP2011526334A priority Critical patent/JP4860014B2/ja
Publication of WO2011099370A1 publication Critical patent/WO2011099370A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0282—Positioning or locking of single discs of discs rotating during transducing operation by means provided on the turntable
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2045—Hubs

Definitions

  • the present invention relates to a sub-assembly of a disk drive device, particularly to a technique for reducing the inclination of a surface on which a recording disk is placed.
  • a hard disk drive is known as a medium used for a storage device of a computer.
  • a recording disk on which recording tracks are formed is rotated at a high speed by a brushless motor.
  • a recording / reproducing head is arranged so as to maintain a slight gap with respect to the surface of the recording disk (see, for example, Patent Document 1). ).
  • the recording disk may be supported by a hub that is a rotating part of the brushless motor with the recording disk tilted.
  • the recording disk is supported by an extension part formed on the hub of the brushless motor.
  • the axial height of the disk seating surface of the extension part may vary in the circumferential direction.
  • the seating surface tilt since the seating surface is inclined with respect to the rotation axis, there is a maximum value and a minimum value for the height in the axial direction, and the difference in height (hereinafter referred to as the seating surface tilt, which is referred to as a seating surface tilt value).
  • a so-called 3.5-inch HDD has a recording disk with a large diameter of about 95 mm, and the influence of the inclination of the recording disk appears remarkably when the recording / reproducing head traces the vicinity of its outer periphery.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a sub-assembly of a disk drive device in which the inclination of a surface on which a recording disk is placed is reduced including a change with time.
  • a sub-assembly of a disk drive device includes a base member, a hub on which a recording disk is to be placed, a shaft coupled to an opening hole in the center of the hub, A bearing unit that supports the shaft so as to be rotatable relative to the base member.
  • the hub includes an outer cylinder portion that extends in the axial direction of the bearing unit to hold the recording disk, an outer extension portion that is connected to the outer cylinder portion and extends radially outward of the recording disk, and an outer extension portion.
  • a disk seating surface formed.
  • the opening hole portion is connected to the hub so that the inclination value of the disc seating surface determined by the coupling state of the opening hole portion of the hub and the shaft is not more than a predetermined maximum allowable value.
  • the pressure contact state with the shaft is maintained at the treatment temperature when the aging treatment is performed on at least the coupling portion of the shaft.
  • the pressure contact state between the shaft and the opening hole is maintained at the processing temperature when the aging treatment is performed on at least the coupling portion of the hub and the shaft.
  • the hub and shaft are in pressure contact, so the posture of both is the same as before and after the aging treatment. It is hard to change.
  • the pressure contact state of the hub and the shaft is determined so that the inclination value of the disc seating surface determined by the coupling state of the opening hole portion of the hub and the shaft is not more than a predetermined maximum allowable value, the aging treatment is performed.
  • the “disc drive device sub-assembly” may be a device for driving a recording disk, for example, a brushless motor.
  • the sub-assembly of the disk drive device includes, for example, a hard disk drive device that is mounted with a recording disk for magnetically writing / reading data and is driven to rotate (sometimes simply referred to as an HDD or a disk drive device). It can be applied to a brushless motor that is mounted on a motor and drives a recording disk.
  • FIG. 1 is a top view showing a disk drive device on which a subassembly 100 of the disk drive device according to the present embodiment is mounted.
  • FIG. 1 shows a state in which a top cover (not shown) is removed in order to show the inner structure of the subassembly 100.
  • the subassembly 100 includes a base plate 10 that functions as a base member, and a hub 12.
  • the disk drive device further includes a recording disk 200, a data read / write unit 14, and a top cover (not shown).
  • the side on which the hub 12 is mounted with respect to the base plate 10 (the upper side in FIG. 1) will be described as the upper side.
  • the recording disk 200 is placed on the hub 12 and rotates as the hub 12 rotates.
  • the base plate 10 is formed by, for example, molding an aluminum alloy by die casting.
  • the base plate 10 rotatably supports the hub 12 via a bearing described later.
  • the data read / write unit 14 includes a recording / reproducing head 14a, a swing arm 14b, a pivot assembly 14c, and a voice coil motor 14d.
  • the recording / reproducing head 14 a is attached to the tip of the swing arm 14 b and records data on the recording disk 200 and reads data from the recording disk 200.
  • the pivot assembly 14c supports the swing arm 14b with respect to the base plate 10 so as to be swingable around the head rotation axis.
  • the voice coil motor 14 d swings the swing arm 14 b around the head rotation axis, and moves the recording / reproducing head 14 a to a desired position on the recording surface of the recording disk 200.
  • the data read / write unit 14 is configured using a known technique for controlling the position of the head.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG.
  • the sub-assembly 100 of the disk drive device mounts two 3.5-inch recording disks 200 having a diameter of 95 mm, for example, and rotates them.
  • the diameter of the central hole of each of the two recording disks 200 assumed is 25 mm and the thickness is 1.27 mm.
  • the subassembly 100 includes a substantially cup-shaped hub 12, a shaft 16, a flange 18, a yoke 20, a cylindrical magnet 22, a base plate 10, a laminated core 24, a coil 26, a sleeve 28, and a counter plate. 30, a lubricant 32, an adhesive 34, and a damping ring 36.
  • the hub 12 is formed in a convex shape centered on the motor rotation axis R.
  • a case where two recording disks 200 are mounted on the hub 12 is considered, but one recording disk may be used.
  • the central hole of the two recording disks 200 is fitted into the cylindrical outer cylindrical surface 12a of the hub 12 protruding upward.
  • the lower recording disk 200a is seated on a seating surface 12b of the surface of the hub 12 projecting radially from the lower end of the outer cylindrical surface 12a.
  • the diameter of the outer cylinder surface 12a is 25 mm, for example. More precisely, the diameter of the outer cylindrical surface 12a is 24.978 ⁇ 0.01 mm.
  • An annular first spacer 38 is disposed on the upper surface of the recording disk 200a, and a space is formed between the recording disk 200a and another recording disk 200b.
  • An annular second spacer 40 is disposed on the upper surface of the recording disk 200b, and a clamper 42 is mounted on the upper surface. Therefore, the clamper 42 fixes the two recording disks 200 and the first spacer 38 to the hub 12 in a pressed state via the second spacer 40.
  • the clamper 42 is fixed to the upper surface 12 c of the hub 12 by a plurality of clamp screws 44.
  • the hub 12 includes a disk-shaped outer extending portion 46 sandwiched between the cylindrical yoke 20 and the recording disk 200a. Further, the hub 12 extends from the end of the outer extending portion 46 toward the base plate 10 in the motor rotation axis R direction. Shaped vertical wall 48.
  • the yoke 20 has a reverse L-shaped section in the direction along the motor rotation axis R, and is formed of a magnetic material such as iron.
  • the yoke 20 is fixed to the lower surface of the outer extending portion 46 and the inner peripheral surface of the vertical wall 48 by using both adhesion and press fitting. On the inner peripheral surface of the vertical wall 48, a convex portion 48a is formed to which the yoke 20 is pressed when the yoke 20 is press-fitted.
  • the convex portion 48 a is an annular portion formed around the motor rotation axis R on the inner wall surface of the vertical wall 48.
  • An adhesive 50 is filled between the lower surface of the outer extending portion 46 and the inner peripheral surface of the vertical wall 48 and the outer peripheral surface of the yoke 20. This is realized by applying an appropriate amount of adhesive 50 to the lower surface of the outer extension 46 and the inner peripheral surface of the vertical wall 48 when the yoke 20 is press-fitted into the hub 12.
  • a raised portion 52 protruding upward is formed in order to seat the recording disk 200a.
  • the raised portion 52 is formed in an annular shape around the motor rotation axis R, and at least the surface of the raised portion 52 where the recording disk 200a is seated is formed as a smooth curved surface.
  • the cross section of the curved surface is an arc shape, and the recording disk 200a comes into line contact with the seating surface 12b.
  • a cylindrical magnet 22 is bonded and fixed to the inner peripheral surface of the yoke 20.
  • the cylindrical magnet 22 is made of a rare earth material such as neodymium, iron, or boron, and faces nine salient poles formed on the laminated core 24 in the radial direction.
  • the cylindrical magnet 22 is magnetized for driving with 12 poles in the circumferential direction.
  • the cylindrical magnet 22 is fixed to the hub 12 via the yoke 20.
  • the hub 12 may be made of a material having a linear expansion coefficient of about 20 ⁇ 10 ⁇ 6 .
  • the hub 12 is formed from an aluminum alloy.
  • the shaft 16 may be made of a material having a linear expansion coefficient of about 10 ⁇ 10 ⁇ 6 .
  • the shaft 16 is formed from SUS420J2. That is, the linear expansion coefficient of the hub 12 is about twice the linear expansion coefficient of the shaft 16. The difference in linear expansion coefficient between the hub 12 and the shaft 16 is about 10 ⁇ 10 ⁇ 6 . In this case, the linear expansion coefficient of the hub 12 is larger than the linear expansion coefficient of the shaft 16.
  • the upper surface 10a of the base plate 10 is provided with a protrusion 54 centered on the motor rotation axis R.
  • the outer peripheral surface 56 of the protrusion 54 is a cylindrical side surface with the motor rotation axis R as the center.
  • the sleeve 28 is bonded and fixed to the inner peripheral surface 58 of the protruding portion 54.
  • a shaft 16 is rotatably accommodated in the sleeve 28.
  • a counter plate 30 is bonded and fixed to an end of the sleeve 28 where the flange 18 fixed to the shaft 16 is accommodated.
  • a lubricant 32 is injected between the shaft 16 and the flange 18 and the sleeve 28 and the counter plate 30.
  • the shaft 16, the flange 18, the lubricant 32, the sleeve 28, and the counter plate 30 constitute a fluid bearing for rotatably supporting the hub 12.
  • a pair of herringbone-shaped radial dynamic pressure grooves RB1 and RB2 spaced apart in the vertical direction are formed on the inner peripheral surface of the sleeve 28, a pair of herringbone-shaped radial dynamic pressure grooves RB1 and RB2 spaced apart in the vertical direction are formed.
  • a herringbone-shaped first thrust dynamic pressure groove SB1 is formed on the upper surface of the flange 18, and a herringbone-shaped second thrust dynamic pressure groove SB2 is formed on the lower surface of the flange 18.
  • a capillary seal portion 60 is formed on the open end side of the sleeve 28.
  • the capillary seal portion 60 is a portion where the gap between the inner peripheral surface of the sleeve 28 and the outer peripheral surface of the shaft 16 gradually widens upward.
  • the capillary seal portion 60 prevents the lubricant 32 from leaking out by a capillary phenomenon.
  • the laminated core 24 is composed of an annular portion 24a and nine salient pole portions 24b extending radially outward therefrom.
  • the laminated core 24 is formed by, for example, laminating eight non-oriented electrical steel sheets having a thickness of 0.35 mm and integrating them by caulking, for example.
  • an electromagnetic steel sheet having a surface subjected to insulation treatment is pressed, and each electromagnetic steel sheet is formed by punching into a desired core shape while forming a half punch.
  • the eight core-shaped electrical steel sheets are integrated by caulking by in-mold caulking using the above-described half punch.
  • a surface treatment is performed to prevent peeling of the surface of the laminated core.
  • Various methods can be employed for this surface treatment. For example, a method of attaching an epoxy resin by a method such as spray coating or cationic electrodeposition is preferable in that a uniform coating film can be formed.
  • a coil 26 is wound around each salient pole portion 24 b of the laminated core 24.
  • a driving magnetic flux is generated along the salient pole portion 24b by passing a three-phase substantially sinusoidal driving current through the coil 26.
  • the damping ring 36 is a cylindrical member formed of a softer material than the electromagnetic steel plate of the laminated core 24, for example, aluminum that is light and easy to process.
  • the damping ring 36 is located between the laminated core 24 and the protruding portion 54, and is pressed into the annular portion 24a of the laminated core 24 to further fix the individual electromagnetic steel plates of the laminated core 24 in the axial direction.
  • the function of suppressing the vibration of the laminated core 24 in the motor rotation axis R direction is provided.
  • the disk drive device configured as described above, that is, the brushless motor
  • a three-phase drive current is supplied to the brushless motor.
  • the drive current flows through the coil 26, a drive magnetic flux is generated along each salient pole portion 24b.
  • the drive magnetic flux and the magnetic field generated by the cylindrical magnet 22 act to generate torque, and the entire rotor including the hub 12 rotates.
  • the recording disk 200 may be tilted with respect to the base plate 10 in the disk drive device constituted by the brushless motor as described above.
  • the recording disk 200 is supported by the seating surface 12 b that is an extended portion formed in the hub 12.
  • the hub 12 may be inclined and fixed with respect to the shaft 16 depending on the joining state of the joint portion between the opening hole portion 12 d of the hub 12 and the shaft 16.
  • the axial height of the seating surface 12b varies in the axial direction in the circumferential direction.
  • the seating surface is inclined with respect to the rotation axis, there is a maximum value and a minimum value for the height in the axial direction, and a seating surface tilt that is a difference in height occurs.
  • the recording disk 200 is attached with an inclination.
  • the recording / reproducing head 14a is tilted and traced on the recording disk 200, and so-called head touch characteristics are deteriorated.
  • the head touch characteristic is deteriorated, the data read / write error rate is deteriorated.
  • the maximum value and the minimum value of the height in the axial direction of the seating surface 12b and the “sitting surface tilt” based thereon will be considered.
  • the hub 12 is fixed at a right angle to the shaft 16, the height of the seating surface 12b in the axial direction is substantially the same at any position in the circumferential direction.
  • a portion having the highest axial height hereinafter referred to as HP
  • a portion having the lowest axial height hereinafter referred to as LP
  • HP and LP exist at angular positions facing each other across the motor rotation axis R.
  • the influence of the seating surface inclination on the data error rate can be obtained by experiments.
  • the seating surface inclination value height difference between HP and LP
  • the maximum allowable value of the seating surface inclination value of the 3.5-inch HDD can be 3 ⁇ m.
  • the seating surface inclination value is 10 ⁇ m or less, an experimental result has been obtained that the influence on the error rate can be reduced by providing a weight member which will be described later although it is not within the maximum allowable value.
  • the present inventors have verified the structure and manufacturing process of the subassembly 100 in detail.
  • an aging treatment is performed to remove stress generated when the joint portion between the opening hole portion 12d of the hub 12 and the shaft 16 is fixed by tight fitting. It was found that the thermal expansion that occurred during the process was involved.
  • an aging treatment to at least the joint between the hub 12 and the shaft 16
  • part of the residual stress at the joint can be released, so that the joint state between the hub 12 and the shaft 16 changes due to the residual stress after assembly. Can be difficult. That is, the possibility of increasing the seating surface inclination as a change with time can be reduced by the aging treatment.
  • the subassembly 100 in order to prevent the seating surface inclination that occurs as a change with time due to the residual stress in the joint portion between the hub 12 and the shaft 16, Aging treatment is applied to the joint. For example, as an aging treatment, the joined shaft 16 and hub 12 are allowed to stand in an atmosphere of 80 to 90 ° C. for 30 to 180 minutes. As a result, a part of the residual stress at the joint portion is released. That is, an increase in the seating surface inclination value due to a change with time can be reduced.
  • the opening 12d provided at the center of the hub 12 has to be processed with high accuracy in its cylindrical inner peripheral surface so that a squareness can be obtained when the shaft 16 is fixed.
  • irregular surfaces such as a portion that is not a perfect circle and a portion that is not flat in the axial direction exist on the inner peripheral surface. For this reason, when the opening hole portion 12d is thermally expanded during the aging treatment, a portion of the irregular surface that is a gap until then (a non-pressure contact portion) is newly brought into a pressure contact state or a pressure contact state until then. The part which maintains is generated at random.
  • the stress at which the opening hole portion 12d tightens the shaft 16 concentrates on the pressure contact portion generated by the expansion, and the portion is crushed.
  • irregular and irreversible deformation occurs in the entire joint portion of the opening hole portion 12d, and the joining state of the opening hole portion 12d and the shaft 16 changes.
  • the aging treatment portion is returned to room temperature and the expanded portion contracts, the expanded portion is plastically deformed before the aging treatment. That is, a gap is generated between the shaft 16 and the shaft 16.
  • the seating surface inclination value of the seating surface 12b may increase.
  • the seating surface inclination value of the recording disk 200 determined by the coupling state of the opening 12d of the hub 12 and the shaft 16 is not more than a predetermined maximum allowable value.
  • the opening hole portion 12d is configured to maintain a pressure contact state with the shaft 16 at a processing temperature when an aging treatment is performed on at least a joint portion between the hub 12 and the shaft 16.
  • a processing temperature when an aging treatment is performed on at least a joint portion between the hub 12 and the shaft 16.
  • the surface roughness that is the degree of the irregular surface of the opening hole portion 12d is aged.
  • the diameter is configured to be substantially smaller than the difference between the diameter of the opening hole 12d and the diameter of the shaft 16 at the processing temperature.
  • the surface roughness of the opening hole 12d is set to a range of 2 ⁇ m or less.
  • the opening hole portion 12d can substantially maintain the pressure contact state with the shaft 16 even at the aging treatment temperature.
  • the opening hole portion 12d substantially maintains the pressure contact state with the shaft 16 at the treatment temperature of the aging treatment.
  • the temperature of the hub 12 is set to the aging treatment temperature and an axial separation test load is applied between the shaft 16 and the hub 12, the connection between the shaft 16 and the hub 12 can be substantially maintained.
  • the relationship between the force and the seating surface inclination value after aging treatment is determined by experiment. For example, in the present embodiment, when the diameter of the shaft 16 is 4 mm, a force of 3N, for example, is applied as a separation test load between the shaft 16 and the hub 12 in the axial direction.
  • the seating surface inclination value after the aging treatment is a predetermined maximum allowable value (for example, 3 ⁇ m).
  • the shape of the opening hole 12d is such that, for example, 3N is added as a separation test load in the axial direction between the shaft 16 and the hub 12 so as to have a coupling force that maintains a substantial coupling state with the shaft 16.
  • the size, surface roughness, material, etc. can be determined.
  • non-standard products may be produced in which the seating surface inclination value subjected to the aging treatment exceeds the predetermined maximum allowable value (for example, 3 ⁇ m).
  • a correction process for correcting the axial dimension of the seating surface 12b may be performed so that the seating surface inclination value is equal to or less than a predetermined maximum allowable value.
  • the subassembly 100 is fixed, and a force in a direction in which the seating surface inclination value is reduced is applied to the hub 12 to reduce the seating surface inclination value. This operation is desirably repeated until the seating surface inclination value is equal to or less than a predetermined maximum base maximum allowable value.
  • the seating surface inclination value of the subassembly 100 is within the maximum allowable value in order to maintain the predetermined quality.
  • a non-standard product may be mistakenly mixed into the sub-assembly 100 within the standard after confirmation. If the recording disk 200 or the like is mounted on the non-standard subassembly 100 as described above and the disk drive device is produced, the error rate of the disk drive device may decrease. In such a case, the repair takes a great deal of time. Therefore, it is desirable for the subassembly 100 to clarify whether or not the seating surface inclination value has been confirmed and whether or not it is within the standard.
  • a display mark corresponding to the seating surface tilt value is attached to any position of the subassembly 100 so that it can be determined whether or not the seating surface tilt value has been confirmed.
  • the display mark may be displayed at any position on the subassembly 100. For example, it is preferable in that it can be easily discriminated when displayed on the upper surface 12c of the outer cylinder portion of the hub 12.
  • This display mark may be displayed corresponding to the angular position of the HP.
  • displaying at the HP angular position on the upper surface 12c of the hub 12 is preferable in that it can be discriminated even after the recording disk 200 is mounted.
  • FIG. 3 shows an example in which the display mark 300 in the present embodiment is displayed corresponding to the HP angular position of the upper surface 12 c of the outer cylinder portion of the hub 12.
  • the display mark 300 may be displayed when the shaft 16 is coupled to the opening 12d of the hub 12. That is, the display mark 300 can be displayed continuously in the operation of coupling the shaft 16 to the opening 12 d of the hub 12.
  • the display mark 300 may be displayed before the aging treatment. In this case, it is advantageous in that the operation of applying the display mark 300 is easy.
  • the display mark 300 may be displayed after the aging process.
  • the display mark 300 may have other information in addition to information such as confirmation of the seating surface inclination value and HP position.
  • the display mark 300 may be provided with information such as a specific magnitude of the seating surface tilt value and whether or not an operation for correcting the seating surface tilt value has been performed. Such information can be determined in advance corresponding to, for example, the shape and color of the display mark 300 and the number of applied marks.
  • the external dimension of the display mark 300 can be small when the seating surface tilt value is small, and can be large when the seating surface tilt value is large.
  • the recording disk 200 is mounted with an inclination.
  • the recording / reproducing head 14a traces over the recording disk 200 rotating at high speed through a slight gap.
  • FIG. 3 for the sake of easy understanding, the situation where the recording / reproducing head 14a is located in the area farthest from the recording disk 200 (LP corresponding position) and the situation located in the closest area (HP corresponding position) are simultaneously expressed. As shown, two recording / reproducing heads 14a are drawn on the left and right.
  • the recording / reproducing head 14a depicted on the left side of the motor rotation axis R in FIG. 3 applies an outward force as indicated by an arrow M in FIG.
  • the recording / reproducing head 14a depicted on the right side of the rotation axis in FIG. 3 applies an inward force as indicated by an arrow N in FIG.
  • the recording / reproducing head 14a may be off-tracked corresponding to the inclination of the recording disk 200 (inclination based on the seating surface inclination value).
  • the gap 250 between the recording disk 200 and the outer cylindrical surface 12a is preliminarily moved to one side and mounted.
  • the recording disk 200 is mounted so that the gap on the HP side (right side of the motor rotation axis R in FIG. 3) is minimized and fitted to the outer cylindrical surface 12a of the hub 12.
  • the weight member 400 corresponding to the inclination value of the seating surface is attached to the hub 12 so as to suppress the vibration of the recording disk 200.
  • the weight member 400 can be mounted at a position corresponding to the HP, for example. As a result, the external force by the weight member 400 acts in the direction of decreasing the axial height at the HP position, and the vibration of the recording disk 200 in the motor rotation axis R direction can be reduced.
  • the weight member 400 may be attached to any location on the hub 12 as long as it corresponds to the HP.
  • a groove portion extending in the circumferential direction on the inner peripheral side of the outer extension portion 46 of the hub 12 and having an opening on the motor rotation shaft R side may be formed and attached thereto. In this case, it is preferable in that the weight member 400 is more difficult to come off.
  • the hub 12 is formed with a groove portion 12e extending in the circumferential direction at a position overlapping the outer extension portion 46 in the motor rotation axis R direction, and the weight member 400 is mounted in the groove portion 12e. It may be. In this case, since the groove 12e is close to the opening on the inner side of the hub 12, it is preferable in that the work of attaching the weight member 400 is easy.
  • the weight member 400 can have various shapes.
  • the weight member 400 has a mass part 400a having a predetermined mass at the center, and has a substantially semicircular spring part 400b that holds the mass part 400a in the groove part 12e on both sides thereof. You may comprise.
  • the weight member 400 can be easily slid while being held in the groove portion 12e by the elasticity of the spring portion 400b. As a result, the insertion operation into the groove 12e and the determination operation of the attachment position are facilitated.
  • the bearing unit has a pair of radial dynamic pressure grooves RB1 and RB2.
  • the weight member 400 may be attached to a position between the radial dynamic pressure grooves RB1 and RB2 in the motor rotation axis R direction of the inner peripheral portion of the hub 12. By disposing the weight member 400 at this position, an effect of minimizing the presence of the weight member 400 on the dynamic pressure generation balance of the radial dynamic pressure grooves RB1 and RB2 can be expected.
  • the weight member 400 may be attached at a position closer to the motor rotation axis R than the outer cylindrical surface 12a of the hub 12 in the radial direction of the hub 12. Mounting on the inner side of the outer cylindrical surface 12a of the hub 12 is advantageous in that the thickness of the hub 12 in the radial direction can be maintained thick, so that the rigidity is not lowered. Further, the weight member 400 may be attached to a position outside the outer periphery of the bearing unit in the radial direction of the hub 12. Arranging at such a position is advantageous in that the work for attaching the weight member 400 is wide and the attachment work is easy.
  • the weight member 400 When attaching the weight member 400, it may not be attached at a desired position in the first operation.
  • the weight member 400 has the spring portion 400b.
  • the weight member 400 is slidable within the groove 10e by using the elastic force of the spring part 400b, and is attached by being stopped at a desired position.
  • the weight member 400 of the present embodiment has a mounting force that substantially maintains the stopped state at the position where the hub 12 is mounted in the groove 12e both when the hub 12 starts rotating and when the hub 12 stops rotating. It is comprised so that it may have.
  • the weight member 400 desirably determines the spring property, shape, length, and the like of the spring portion 400b in order to obtain the mounting force.
  • This mounting force is preferably determined in advance by taking into account the inertial force received at the start and stop of rotation by a test.
  • the weight member 400 may be removably attached.
  • the elastic force of the spring part 400b can be used also at the time of attachment / detachment. By making it attachable and detachable in this manner, the weight member 400 can be adjusted later and the weight member 400 can be easily replaced.
  • the diameter of the opening hole 12d of the hub 12 is formed to be about 4 mm.
  • the diameter of the shaft 16 is slightly larger than the diameter of the opening hole 12d of the hub 12.
  • the shaft 16 is inserted into the opening hole portion 12d of the hub 12 and fixed by an interference fit.
  • the hub 12 is inserted in a state where the diameter of the opening hole 12d of the hub 12 is smaller than the diameter of the shaft 16, the friction resistance during insertion is large and the surface of the opening hole 12d is not uniform. May be tilted and fixed.
  • the shaft 16 may be inserted into and fixed to the opening hole 12d in a state where the diameter of the opening hole 12d of the hub 12 is larger than the diameter of the shaft 16. Specifically, the opening hole portion 12 d of the hub 12 is heated and thermally expanded, so that the diameter of the opening hole portion 12 d is larger than the diameter of the shaft 16. In this state, the shaft 16 is inserted and fixed by returning to room temperature. As a result, the hub 12 is prevented from being inclined and fixed to the shaft 16. Further, since it is not press-fitted, it is preferable in that the deformation of the hub 12 and the occurrence of residual stress can be reduced.
  • the heating temperature of the opening hole 12d can be obtained by calculation and experiment using parameters such as the diameter of the opening hole 12d, the linear expansion coefficient of the base material constituting the hub 12, and the diameter of the shaft 16. For example, if the heating temperature of the opening hole 12d when inserting the shaft 16 is higher than the aging treatment temperature by 50 ° C. or more, the insertion of the shaft 16 is easy and the increase in the seating surface inclination value during the aging treatment can be reduced.
  • the inventors have obtained experimental results that are advantageous in terms of point.
  • the inventors have obtained an experimental result that it is advantageous that the heating temperature of the opening hole portion 12d is 150 ° C. or less, which is less likely to cause deformation or discoloration in the vicinity of the opening hole portion 12d.
  • the diameter of the shaft 16 at 25 ° C. is 2 to 9 ⁇ m larger than the diameter of the opening hole 12d
  • the aging treatment temperature is 80 ° C. to 90 ° C.
  • the heating temperature of the hole 12d is set to 120 to 140 ° C. According to this setting, the inventors have obtained an experimental result that it is unlikely that a non-standard product having a seating surface inclination value subjected to aging treatment exceeding a predetermined maximum reference value is produced.
  • the subassembly 100 may accidentally collide with production equipment. At this time, scratches and deformation may occur in the outer extension 46 of the hub 12. If the extended portion 46 is deformed, the mounting stability of the recording disk 200 is impaired, and the possibility that the recording disk 200 is placed in an inclined manner increases. Therefore, in the present embodiment, the outer flange portion of the outer extending portion 46 is closer to the motor rotation shaft R side than the circumscribed surface that circumscribes the constituent parts of the hub 12 existing on one and the other side of the outer flange portion in the axial direction. It is configured to be located. As an example, as shown in FIG.
  • the outer flange portion 46 a of the outer extension portion 46 is configured to be disposed radially inside the circumscribed conical surface 500 that circumscribes the outer shape of the hub 12. That is, in FIG. 2, a circumscribed conical surface 500 that circumscribes the outer shape of the hub 12 and decreases in diameter toward the hub 12 from the base plate 10 side is assumed.
  • the outer flange portion 46a is configured so as to be included in the radial inner side of the circumscribed conical surface 500 closest to the outer flange portion 46a and not to contact.
  • the outer flange portion 46a only needs to be retracted toward the motor rotation axis R direction side from other components, and may not be a conical surface like the circumscribed conical surface 500.
  • a cylindrical surface that encloses the outer flange portion 46a may be used, and similar effects can be obtained.
  • a brushless motor having the structure shown in FIG. 2 may be manufactured, and the brushless motor may be mounted on an optical disk recording / reproducing device such as a CD (Compact Disc) device or a DVD (Digital Versatile Disc) device.
  • an optical disk recording / reproducing device such as a CD (Compact Disc) device or a DVD (Digital Versatile Disc) device.
  • the present invention can be used for a subassembly of a disk drive device such as a hard disk drive.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

La présente invention concerne un sous-ensemble d'un dispositif d'entraînement de disque permettant de réduire la pente d'une surface sur laquelle est placé un disque d'enregistrement. Le sous-ensemble (100) est pourvu d'une plaque de base (10), d'un moyeu (12) sur lequel un disque d'enregistrement (200) doit être placé, d'un arbre (16) couplé à une partie d'ouverture (12d) du centre du moyeu (12), et d'une unité porteuse servant à supporter l'arbre (16) de sorte qu'il puisse tourner par rapport à la plaque de base (10). Le moyeu (12) comprend un fût servant à tenir le disque d'enregistrement (200), une partie s'étendant vers l'extérieur (46) disposée à la suite du fût, et une surface d'appui (12b) formée sur la partie s'étendant vers l'extérieur (46). De plus, la partie d'ouverture (12d) est configurée pour maintenir un état de contact de pression avec l'arbre (16) à la température de traitement lorsque l'on applique un traitement de vieillissement au moins aux parties couplées du moyeu (12) et de l'arbre (16) de sorte que la valeur de la pente de la surface d'appui du disque définie dans un état couplé de la partie d'ouverture (12d) avec l'arbre (16) soit inférieure ou égale à une tolérance maximale prédéfinie par rapport à une surface perpendiculaire à la direction axiale.
PCT/JP2011/051545 2010-02-15 2011-01-27 Sous-ensemble d'un dispositif d'entraînement de disque WO2011099370A1 (fr)

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JP2010030207 2010-02-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001181760A (ja) * 1999-12-22 2001-07-03 Daido Steel Co Ltd 磁気記録装置のトップクランプ用β型チタン合金材及びトップクランプ
JP2007257784A (ja) * 2006-03-24 2007-10-04 Nisshin Steel Co Ltd ハードディスク用クランプリング及びその製造方法
JP2010205324A (ja) * 2009-03-02 2010-09-16 Alphana Technology Co Ltd ディスク駆動装置の製造方法、ディスク駆動装置及びディスク駆動装置のサブアッセンブリ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001181760A (ja) * 1999-12-22 2001-07-03 Daido Steel Co Ltd 磁気記録装置のトップクランプ用β型チタン合金材及びトップクランプ
JP2007257784A (ja) * 2006-03-24 2007-10-04 Nisshin Steel Co Ltd ハードディスク用クランプリング及びその製造方法
JP2010205324A (ja) * 2009-03-02 2010-09-16 Alphana Technology Co Ltd ディスク駆動装置の製造方法、ディスク駆動装置及びディスク駆動装置のサブアッセンブリ

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JPWO2011099370A1 (ja) 2013-06-13

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