WO2022211105A1 - スピンドルモータ及びそれを備えるディスク駆動装置 - Google Patents
スピンドルモータ及びそれを備えるディスク駆動装置 Download PDFInfo
- Publication number
- WO2022211105A1 WO2022211105A1 PCT/JP2022/016895 JP2022016895W WO2022211105A1 WO 2022211105 A1 WO2022211105 A1 WO 2022211105A1 JP 2022016895 W JP2022016895 W JP 2022016895W WO 2022211105 A1 WO2022211105 A1 WO 2022211105A1
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- WIPO (PCT)
- Prior art keywords
- shaft
- dynamic pressure
- axial direction
- spindle motor
- annular member
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 48
- 238000003780 insertion Methods 0.000 claims abstract description 5
- 230000037431 insertion Effects 0.000 claims abstract description 5
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- 230000000052 comparative effect Effects 0.000 description 15
- 230000004044 response Effects 0.000 description 11
- 230000004043 responsiveness Effects 0.000 description 10
- 230000005284 excitation Effects 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
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- 239000002184 metal Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
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- 239000001307 helium Substances 0.000 description 2
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- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
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- 238000005266 casting Methods 0.000 description 1
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
-
- 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
-
- 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
- G11B19/2036—Motors characterized by fluid-dynamic bearings
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
Definitions
- the present invention relates to a spindle motor and a disk drive device including the same.
- a conventional spindle motor includes a shaft portion extending along a vertically extending central axis, a bracket body (base portion), a hub member (rotor), and bearing means (bearing portion).
- the shaft is fixed to the bracket body.
- the bearing means rotatably supports the hub member with the shaft portion as a central axis.
- the shaft portion extends axially downward from the upper end and has a clamp hole (screw hole) into which a mounting screw is screwed (see, for example, Patent Document 1).
- An object of the present invention is to provide a spindle motor capable of reducing the occurrence of shaft shake.
- An exemplary spindle motor of the present invention includes a shaft, a base, a stator core, a rotor, and bearings.
- the shaft extends along a vertically extending central axis.
- the base has a through hole to which the lower end of the shaft is fixed.
- the stator core is arranged on the upper surface of the base and surrounds the shaft.
- the rotor rotates around the central axis.
- the bearing rotatably supports the rotor around the shaft.
- the shaft has a threaded hole extending axially downward from the upper end.
- the threaded hole has a threaded portion that engages with a screw.
- the bearing includes upper and lower annular members and a sleeve.
- the upper annular member and the lower annular member protrude radially outward from the outer peripheral surface of the shaft and are spaced apart in the axial direction.
- the sleeve has an insertion hole into which the shaft is inserted.
- the sleeve extends axially over the outer peripheral surface of the shaft and has a tubular shape.
- the upper end of the upper annular member is arranged axially below the lower end of the threaded portion.
- FIG. 1 is a longitudinal sectional view of a disk drive device according to an embodiment of the invention.
- FIG. 2 is a longitudinal sectional view of the motor according to the embodiment of the invention.
- FIG. 3 is a longitudinal sectional view of a motor according to an embodiment of the invention.
- FIG. 4 is a longitudinal sectional view showing an enlarged part of the base portion of the motor according to the embodiment of the present invention.
- FIG. 5 is a graph showing evaluation results of vibration response of the motor according to the embodiment of the present invention.
- FIG. 6 is a graph showing evaluation results of vibration responsiveness of the motor according to the embodiment of the present invention.
- a direction parallel to the central axis C is called an "axial direction”
- a direction orthogonal to the central axis C is called a “radial direction”
- a direction along an arc centered on the central axis C is called a “circumferential direction.”
- the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the cover part side as the upper side with respect to the base part.
- this definition of the vertical direction is not intended to limit the direction of use of the motor and the disk drive device 1 according to the present invention.
- FIG. 1 is a longitudinal sectional view of a disk drive device 1 according to an embodiment of the invention.
- the disk drive device 1 is a hard disk drive.
- the disk drive device 1 includes a spindle motor 10 , a disk 50 , an access section 60 and a housing 70 .
- the housing 70 accommodates the spindle motor 10, the disk 50, and the access section 60 inside.
- the inside of the housing 70 is filled with a gas having a density lower than that of air. Specifically, helium gas is filled. Hydrogen gas or the like may be filled instead of helium gas.
- the housing 70 has a base portion 71 and a cover portion 72 .
- the base portion 71 is formed by casting a metal die-cast member made of an aluminum alloy. Metals other than aluminum alloys may be used for the die-cast member.
- the base portion 71 has side walls surrounding the sides and has an open top surface. An upper opening of the base portion 71 is closed by a cover portion 72 .
- the disk 50 is a disk-shaped information recording medium with a hole in the center.
- Each disk 50 is mounted on the spindle motor 10 and arranged in parallel with each other in the axial direction at equal intervals via spacers 80 .
- the access unit 60 performs at least one of reading and writing information on the disc 50 .
- the access section 60 has a head 61 , an arm 62 and a head moving mechanism 63 .
- the head 61 magnetically reads or writes information on the disk 50 .
- Arm 62 supports head 61 .
- the head moving mechanism 63 moves the head 61 relative to the disk 50 by moving the arm 62 .
- (2. Configuration of spindle motor) 2 is a longitudinal sectional view of the spindle motor 10.
- the spindle motor 10 rotates the disk 50 around the central axis C while supporting the disk 50 .
- the spindle motor 10 has a shaft 11 , a stator 20 , a rotor 30 , a bearing portion 40 and a base portion 71 .
- the base portion 71 is part of the housing 70 and also part of the spindle motor 10 .
- the base portion 71 has a through hole 720 penetrating in the axial direction, and a cylindrical annular projecting portion 721 projecting axially upward from the upper surface and surrounding the shaft 11 .
- Through hole 720 is arranged on central axis C. As shown in FIG.
- the shaft 11 is a columnar member extending along a central axis C extending in the vertical direction.
- the lower end of the shaft 11 is press-fitted into the through-hole 720 and fixed. Thereby, the shaft 11 and the base portion 71 are fixed.
- the shaft 11 has a screw hole 11a extending axially downward from its upper end.
- the threaded hole 11a has a threaded portion 110a that is screwed with the screw 90 .
- the threaded portion 110a is formed by cutting, for example, and may be formed into either a female thread shape or a male thread shape depending on the shape of the thread to be screwed.
- the screw hole 11a and the cover screw hole 72a provided in the cover portion 72 overlap in the axial direction and are screwed via a screw 90 (see FIG. 1). Thereby, the shaft 11 and the cover portion 72 are fixed.
- the cover screw hole 72a may be a through hole that is not threaded.
- the shaft 11 has a hollow hole 11b extending axially upward from the lower end.
- the moment of inertia of area at the lower end of the shaft 11 is reduced. Therefore, the load required when press-fitting the shaft 11 into the through hole 720 is reduced, and press-fitting workability is improved.
- the upper end of the hollow hole 11b is arranged above the upper end of the through hole 720 in the axial direction. Thereby, when the shaft 11 is press-fitted into the through hole 720, the press-fitting workability is further improved.
- the shaft 11 preferably has an outer diameter of 5.5 mm or more and 7.0 mm. As a result, it is possible to prevent the shaft 11 from tilting with respect to the base portion 71 while ensuring the rigidity of the shaft 11 .
- the stator 20 surrounds the lower portion of the shaft 11 and is fixed to the base portion 71 .
- Stator 20 has an annular stator core 21 and a plurality of coils 22 .
- the stator core 21 is an annular laminated structure in which a plurality of magnetic bodies are laminated.
- Stator core 21 is arranged on the upper surface of base portion 71 and surrounds shaft 11 . Specifically, the inner peripheral surface of stator core 21 is press-fitted to the outer peripheral surface of annular projection 721 .
- the upper end of the hollow hole 11b is arranged at a position radially overlapping the annular projecting portion 721 and the stator core 21 . This can reduce deformation of the annular projecting portion 721 arranged around the through-hole 720 during press-fitting. Therefore, it is possible to reduce the occurrence of shaft shake of the stator core 21 supported by the annular projecting portion 721 .
- the stator core 21 has a plurality of teeth 21a protruding radially outward.
- the plurality of coils 22 are composed of conducting wires 22a wound around teeth 21a.
- the rotor 30 has a hub member 31 , magnets 32 and yokes 33 .
- the hub member 31 is formed in a tubular shape and has a sleeve 42 fixed therein.
- the yoke 33 is annularly formed and fixed to the lower inner peripheral surface of the hub member 31 .
- the magnet 32 is attached to the inner peripheral surface of the yoke 33 . Thereby, the magnet 32 is held by the hub member 31 via the yoke 33 .
- the inner peripheral surface of the magnet 32 is a magnetic pole surface, and radially faces the outer peripheral surfaces of the plurality of teeth 21a.
- the hub member 31 is made of a magnetic material (for example, SUS)
- the magnet 32 may be directly fixed to the inner peripheral surface of the hub member 31 and the yoke 33 may be omitted.
- the bearing portion 40 is a conical fluid dynamic pressure bearing that supports the rotor 30 rotatably around the central axis C. That is, the bearing portion 40 rotatably supports the rotor 30 with the shaft 11 as the central axis, and the rotor 30 rotates around the central axis C. As shown in FIG.
- the bearing portion 40 includes an upper annular member 41 a , a lower annular member 41 b and a sleeve 42 .
- the upper annular member 41a and the lower annular member 41b are fixed to the outer peripheral surface of the shaft 11 by press fitting or the like, and protrude radially outward from the outer peripheral surface.
- the upper annular member 41a and the lower annular member 41b are vertically fixed to the outer peripheral surface of the shaft 11 with a space therebetween in the axial direction. That is, the upper annular member 41a and the lower annular member 41b protrude radially outward from the outer peripheral surface of the shaft 11 and are spaced apart in the axial direction.
- the outer peripheral surfaces of the upper annular member 41a and the lower annular member 41b, which face the sleeve 42 in the radial direction, are substantially conical.
- the diameter of the lower portion of the upper annular member 41a gradually decreases downward, and the diameter of the upper portion of the lower annular member 41b gradually decreases upward.
- the upper end of the upper annular member 41a is arranged axially lower than the lower end of the screw portion 110a.
- the center of gravity of the rotor 30 can be arranged close to the central portion of the disk drive device 1 in the axial direction. As a result, the rotational stability of the spindle motor 10 is improved, and deterioration of the vibration performance of the disk drive device 1 can be suppressed.
- the radially inner end of the annular projecting portion 721 overlaps at least a portion of the upper annular member 41a and the lower annular member 41b.
- the radially inner end of the annular projecting portion 721 is positioned radially inward from the radially outer ends of the upper annular member 41a and the lower annular member 41b.
- the lower end of the lower annular member 41b is arranged above the upper end of the hollow hole 11b and the upper end of the stator core 21 in the axial direction.
- the sleeve 42 has an insertion hole 420 into which the shaft 11 is inserted, and is formed in a cylindrical shape.
- the sleeve 42 extends axially over the outer peripheral surface of the shaft 11 .
- the sleeve 42 has an upper inner peripheral surface 42a, a middle inner peripheral surface 42b, and a lower inner peripheral surface 42c in this order from above.
- the upper inner peripheral surface 42a is inclined upward (upward in the axial direction) in a direction away from the shaft 11, and radially faces the outer peripheral surface of the upper annular member 41a.
- the middle inner peripheral surface 42 b is formed along the central axis C and faces the outer peripheral surface of the shaft 11 .
- the lower inner peripheral surface 42c is inclined downward (downward in the axial direction) in a direction away from the shaft 11, and radially faces the outer peripheral surface of the lower annular member 41b.
- the sleeve 42 has a minute gap S between the upper annular member 41a, the lower annular member 41b and the shaft 11. Note that the sleeve 42 may be formed integrally with the hub member 31 .
- the seal portion 44 a is attached to the upper surface of the sleeve 42 and the seal portion 44 b is attached to the lower surface of the sleeve 42 .
- the seal portions 44a and 44b enclose the lubricating oil 43 in the minute gap S.
- the minute gap S may be filled with a fluid such as gas instead of the lubricating oil.
- FIG. 3 is a vertical cross-sectional view of the sleeve 42, showing the shaft 11 with a dashed line.
- the upper inner peripheral surface 42a has a first dynamic pressure groove 421 and a second dynamic pressure groove 422 arranged adjacent to each other in the axial direction.
- the first dynamic pressure groove 421 and the second dynamic pressure groove 422 are inclined in different directions in the circumferential direction toward the upper side in the axial direction.
- the first dynamic pressure generating grooves 421 are disposed axially above the upper inner peripheral surface 42a, and are formed in plurality in the circumferential direction so as to tilt toward the one circumferential side X1 toward the axially upward direction.
- the second dynamic pressure generating grooves 422 are arranged axially below the first dynamic pressure generating grooves 421, and are formed in plurality in the circumferential direction so as to tilt toward the other circumferential side X2 toward the axial direction upward.
- the lower inner peripheral surface 42c has a third dynamic pressure groove 423 and a fourth dynamic pressure groove 424 arranged adjacent to each other in the axial direction.
- the third groove for hydrodynamic bearing 423 and the fourth groove for hydrodynamic bearing 424 are inclined in different directions in the circumferential direction toward the upper side in the axial direction.
- the third dynamic pressure generating grooves 423 are disposed axially below the lower inner peripheral surface 42c, and are formed in plurality in the circumferential direction so as to tilt upward in the axial direction toward the other circumferential side X2.
- the fourth dynamic pressure grooves 424 are disposed above the third dynamic pressure grooves 423 in the axial direction, and are formed in plurality in the circumferential direction so as to tilt toward the one circumferential side X1 toward the axial direction upward.
- the first dynamic pressure generating groove 421 and the fourth dynamic pressure generating groove 424 are formed so as to be inclined toward the one circumferential side X1 toward the axial direction upward. It may be formed so as to be inclined toward the other side X2.
- the second dynamic pressure grooves 422 and the third dynamic pressure grooves 423 are formed so as to tilt toward the one circumferential side X1 toward the axial direction upward.
- the first dynamic pressure groove 421, the second dynamic pressure groove 422, the third dynamic pressure groove 423, and the fourth dynamic pressure groove 424 induce fluid dynamic pressure in the lubricating oil 43 when the rotor 30 rotates.
- first dynamic pressure grooves 421 and the second dynamic pressure grooves 422 are formed in the upper inner peripheral surface 42a. It may be formed on the outer peripheral surface.
- the third dynamic pressure grooves 423 and the fourth dynamic pressure grooves 424 are formed in the lower inner peripheral surface 42c. It may be formed on the outer peripheral surface.
- the distance L1 in the axial direction between the boundary P1 between the first dynamic pressure groove 421 and the second dynamic pressure groove 422 and the upper end of the shaft 11 is preferably 0.60 to 0.85 times the distance L2 in the axial direction between the boundary P1 and the boundary P2 between the third dynamic bearing groove 423 and the fourth dynamic bearing groove 424.
- the distance L1 is preferably 0.50 times or more and 0.80 times or less of the distance L2. At this time, the distance L1 is preferably 8.5 mm or more.
- the distance L1 becomes small, and the distance between the upper end of the upper annular member 41a and the lower end of the threaded portion 110a is narrowed.
- the screw 90 is screwed into the screw hole 11a, the vicinity of the screw hole 11a is deformed, and the axial center is displaced, making it easy for shaft vibration to occur.
- the distance between the lower end of the shaft 11 fixed to the base portion 71 and the lower annular member 41b increases.
- the supporting rigidity of the shaft 11 with respect to the rotor 30 is lowered at the lower portion of the shaft 11, and vibration and noise increase when the spindle motor 10 is driven (vibration responsiveness deteriorates).
- the distance L1 becomes small and the center of gravity of the rotor 30 is arranged axially above the central portion of the disk drive device 1 in the axial direction the rotational stability of the spindle motor 10 decreases and increases. Vibration responsiveness worsens.
- the axial length of the screw hole 11a and the screw portion 110a can be increased while the lower end of the screw portion 110a is arranged axially above the upper end of the upper annular member 41a. A certain width can be secured. Thereby, the shaft 11 and the cover portion 72 can be more firmly fastened via the screw 90 .
- the first dynamic pressure groove 421, the second dynamic pressure groove 422, the third dynamic pressure groove 423, and the fourth dynamic pressure groove 424 induces fluid dynamic pressure in the lubricating oil 43 filled in the minute gap S by a pumping action.
- the sleeve 42 is radially and axially supported without contact with the upper annular member 41a and the lower annular member 41b, and smoothly rotates at high speed with respect to the upper annular member 41a, the lower annular member 41b, and the shaft 11. can be done.
- FIG. 4 is a longitudinal sectional view showing an enlarged part of the base portion 71.
- the through hole 720 has a hole inclined portion 722 at the upper end portion, the inner diameter of which decreases toward the axially lower side.
- the shaft 11 has a curved surface portion 112 and a shaft inclined portion 111 .
- the curved surface portion 112 is formed in a curved surface shape at the radial outer end portion of the lower end of the shaft 11 .
- the shaft inclined portion 111 is formed continuously with the upper end portion of the curved surface portion 112 and has an outer diameter that increases upward in the axial direction.
- the curved surface portion 112 can correct the press-fitting angle of the shaft 11 . Further, after the press-fitting angle is corrected at the curved surface portion 112 , the shaft 11 is press-fitted into the through hole 720 while being guided at an appropriate angle by the shaft inclined portion 111 . As a result, it is possible to reduce the occurrence of axial wobbling of the shaft 11 and improve the press-fitting workability.
- the press-fitting angle of the shaft 11 can be corrected more easily when the curved surface portion 112 of the shaft 11 passes through the hole inclined portion 722 .
- Example 1 the excitation response of the spindle motor 10 when the outer diameter of the shaft 11 is 6.5 mm was evaluated.
- the outer diameter of the shaft 11 according to Example 1, Example 2, Example 3, Example 4, Comparative Example 1, and Comparative Example 2 is 6.5 mm, and the distance L2 is 16.3 mm.
- the distance L1 is 0.50 times the distance L2.
- the distance L1 is 0.60 times the distance L2.
- the distance L1 is 0.70 times the distance L2.
- Example 4 the distance L1 is 0.80 times the distance L2.
- the upper end of the upper annular member 41a is located axially lower than the lower end of the threaded portion 110a.
- the distance L1 is 0.40 times the distance L2. In Comparative Example 2, the distance L1 is 0.90 times the distance L2. In Comparative Example 1, the upper end of the upper annular member 41a is located axially above the lower end of the screw portion 110a.
- Table 1 and FIG. 5 show the evaluation results of the excitation responsiveness of the spindle motors 10 of Examples 1, 2, 3, 4, Comparative Examples 1 and 2.
- the excitation response of Examples 1, 2, 3, and 4 is 0.6 (um/G) or less, and Comparative Examples 1 and 2. It is superior to the excitation response of Further, the vibration responsiveness of Examples 2 and 3 is superior to the vibration responsiveness of Examples 1 and 4.
- the vibration response is found to be excellent.
- Example 5 the outer diameter of the shaft 11 was 6.0 mm. Further, the outer diameter of the shaft 11 according to Example 5, Example 6, Example 7, Comparative Example 3, and Comparative Example 4 is 6.0 mm, and the distance L2 is 15.5 mm. In Example 5, the distance L1 is 0.60 times the distance L2. In Example 6, the distance L1 is 0.70 times the distance L2. In Example 7, the distance L1 is 0.80 times the distance L2. Further, in Examples 5, 6, and 7, the upper end of the upper annular member 41a is located axially lower than the lower end of the threaded portion 110a.
- the distance L1 is 0.50 times the distance L2. In Comparative Example 4, the distance L1 is 0.90 times the distance L2. In addition, in Comparative Example 3, the upper end of the upper annular member 41a is located axially above the lower end of the screw portion 110a.
- Table 2 and FIG. 6 show the evaluation results of the excitation responsiveness of the spindle motors 10 of Examples 5, 6, 7, Comparative Examples 3 and 4.
- the vibration responsiveness of Examples 5, 6, and 7 is 0.6 or less, which is superior to the vibration responsiveness of Comparative Examples 3 and 4. Further, from FIG. 6, even when the distance L1 is 0.85 times the distance L2, the vibration response is 0.6 or less, which is excellent in vibration response.
- the vibration response is found to be excellent.
- the present invention can be used for a housing used in a disk drive device such as a hard disk drive.
- Disk Drive Device 10 Spindle Motor 11 Shaft 11a Screw Hole 11b Hollow Hole 20 Stator 21 Stator Core 21a Teeth 22 Coil 22a Lead Wire 30 Rotor 31 Hub Member 32 Magnet 33 Yoke 40 Bearing Portion 41a Upper Annular Member 41b Lower Annular Member 42 Sleeve 42a Upper Interior Peripheral surface 42b Middle inner peripheral surface 42c Lower inner peripheral surface 43 Lubricating oil 44a, 44b Seal portion 50 Disk 60 Access portion 61 Head 62 Arm 63 Head moving mechanism 70 Housing 71 Base portion 72 Cover portion 72a Cover screw hole 80 Spacer 90 Screw 110a Threaded portion 111 Shaft inclined portion 112 Curved surface portion 420 Insertion hole 421 First dynamic pressure groove 422 Second dynamic pressure groove 423 Third dynamic pressure groove 424 Fourth dynamic pressure groove 720 Through hole 721 Annular protrusion 722 Hole inclined portion C Central axis L1 Distance L2 Distance P1 Boundary P2 Boundary S Minute gap X1 One side in the circumferential direction X2 The other side in the circumferential direction
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Abstract
Description
本発明の例示的な一実施形態のディスク駆動装置1について説明する。図1は本発明の実施形態に係るディスク駆動装置1の縦断面図である。
図2はスピンドルモータ10の縦断面図である。スピンドルモータ10は、ディスク50を支持しながら、中心軸Cを中心としてディスク50を回転させる。スピンドルモータ10は、シャフト11と、ステータ20と、ロータ30と、軸受部40と、ベース部71と、を有する。
図4は、ベース部71の一部を拡大して示す縦断面図である。貫通孔720は、上端部において、軸方向下側に向かうに従って内径が小さくなる孔傾斜部722を有する。また、シャフト11は、曲面部112と、シャフト傾斜部111と、を有する。曲面部112は、シャフト11の下端の径方向外端部において、曲面状に形成されている。シャフト傾斜部111は、曲面部112の上端部と連続して形成され、軸方向上側に向かうに従って外径が大きくなる。
上記実施形態は、本発明の例示にすぎない。実施形態の構成は、本発明の技術的思想を超えない範囲で適宜変更されてもよい。また、実施形態は、可能な範囲で組み合わせて実施されてよい。
10 スピンドルモータ
11 シャフト
11a ネジ孔
11b 中空孔
20 ステータ
21 ステータコア
21a ティース
22 コイル
22a 導線
30 ロータ
31 ハブ部材
32 マグネット
33 ヨーク
40 軸受部
41a 上部環状部材
41b 下部環状部材
42 スリーブ
42a 上部内周面
42b 中部内周面
42c 下部内周面
43 潤滑油
44a、44b シール部
50 ディスク
60 アクセス部
61 ヘッド
62 アーム
63 ヘッド移動機構
70 筐体
71 ベース部
72 カバー部
72a カバーネジ孔
80 スペーサ
90 ネジ
110a ネジ部
111 シャフト傾斜部
112 曲面部
420 挿入孔
421 第1動圧溝
422 第2動圧溝
423 第3動圧溝
424 第4動圧溝
720 貫通孔
721 環状突出部
722 孔傾斜部
C 中心軸
L1 距離
L2 距離
P1 境界
P2 境界
S 微小間隙
X1 周方向一方側
X2 周方向他方側
Claims (15)
- 上下方向に延びる中心軸に沿って延びるシャフトと、
前記シャフトの下端部が固定される貫通孔を有するベース部と、
前記ベース部の上面に配置されて前記シャフトを囲む環状のステータコアと、
前記中心軸周りに回転するロータと、
前記シャフトを中心軸として前記ロータを回転可能に支持する軸受部と、を備え、
前記シャフトは、上端から軸方向下側に延びるネジ孔を有し、
前記ネジ孔は、ネジと螺合するネジ部を有し、
前記軸受部は、
前記シャフトの外周面から径方向外側に突出して軸方向に離れて配置される上部環状部材及び下部環状部材と、
前記シャフトが挿入される挿入孔を有し、前記シャフトの外周面を覆って軸方向に延びる筒状のスリーブと、を備え、
前記上部環状部材の上端は、前記ネジ部の下端よりも軸方向下側に配置される、スピンドルモータ。 - 前記スリーブは、
前記上部環状部材と径方向に対向し、軸方向上側に向かって前記シャフトから離れる方向に傾斜する上部内周面と、
前記下部環状部材と径方向に対向し、軸方向下側に向かって前記シャフトから離れる方向に傾斜する下部内周面と、を有し、
前記上部内周面は、
軸方向に隣り合って配置され、それぞれ周方向に複数形成される第1動圧溝及び第2動圧溝を有し、
前記第1動圧溝及び前記第2動圧溝は、軸方向上側に向かってそれぞれ周方向の異なる方向に傾き、
前記下部内周面は、
軸方向に隣り合って配置され、それぞれ周方向に複数形成される第3動圧溝及び第4動圧溝を有し、
前記第3動圧溝及び前記第4動圧溝は、軸方向上側に向かってそれぞれ周方向の異なる方向に傾き、
前記シャフトの外径が、5.5mm以上6.5mm未満であって、
前記第1動圧溝と前記第2動圧溝との境界と、前記シャフトの上端と、の軸方向における距離は、前記第1動圧溝と前記第2動圧溝との境界と、前記第3動圧溝と前記第4動圧溝との境界と、の軸方向における距離に対して、0.60倍以上0.85倍以下である、請求項1に記載のスピンドルモータ。 - 前記スリーブは、
前記上部環状部材と径方向に対向し、軸方向上側に向かって前記シャフトから離れる方向に傾斜する上部内周面と、
前記下部環状部材と径方向に対向し、軸方向下側に向かって前記シャフトから離れる方向に傾斜する下部内周面と、を有し、
前記上部内周面は、
軸方向に隣り合って配置され、それぞれ周方向に複数形成される第1動圧溝及び第2動圧溝を有し、
前記第1動圧溝及び前記第2動圧溝は、軸方向上側に向かってそれぞれ周方向の異なる方向に傾き、
前記下部内周面は、
軸方向に隣り合って配置され、それぞれ周方向に複数形成される第3動圧溝及び第4動圧溝を有し、
前記第3動圧溝及び前記第4動圧溝は、軸方向上側に向かってそれぞれ周方向の異なる方向に傾き、
前記シャフトの外径が、6.5mm以上7.0mm以下であって、
前記第1動圧溝と前記第2動圧溝との境界と、前記シャフトの上端と、の軸方向における距離は、前記第1動圧溝と前記第2動圧溝との境界と、前記第3動圧溝と前記第4動圧溝との境界と、の軸方向における距離に対して、0.50倍以上0.80倍以下である、請求項1に記載のスピンドルモータ。 - 前記下部環状部材の下端は、前記ステータコアの上端よりも軸方向上側に配置される、請求項1から請求項3のいずれか一項に記載のスピンドルモータ。
- 前記ベース部は、
上面から軸方向上側に突出して前記シャフトを囲む環状の環状突出部を有し、
前記ステータコアは、前記環状突出部の外周面に保持され、
軸方向から見て、前記環状突出部の径方向内端は、前記上部環状部材及び前記下部環状部材の少なくとも一部と重なる、請求項1から請求項4のいずれか一項に記載のスピンドルモータ。 - 前記シャフトは、下端から軸方向上側に延びる中空孔を有する、請求項1から請求項5のいずれか一項に記載のスピンドルモータ。
- 前記中空孔の上端は、前記貫通孔の上端よりも軸方向上側に配置される、請求項6に記載のスピンドルモータ。
- 前記下部環状部材の下端は、前記中空孔の上端よりも軸方向上側に配置される、請求項6又は請求項7に記載のスピンドルモータ。
- 前記中空孔の上端は、前記ステータコアと径方向に重なる位置に配置される、請求項6から請求項8のいずれか一項に記載のスピンドルモータ。
- 前記シャフトは、
下端の径方向外端部において、曲面状に形成された曲面部と、
前記曲面部の上端部と連続して形成され、軸方向上側に向かうに従って外径が大きくなるシャフト傾斜部と、を有する、請求項1から請求項9のいずれか一項に記載のスピンドルモータ。 - 前記シャフトは、外径が5.5mm以上7.0mmである、請求項1から請求項10のいずれか一項に記載の、スピンドルモータ。
- 前記第1動圧溝と前記第2動圧溝との境界と、前記シャフトの上端と、の軸方向における距離は、8.5mm以上である、請求項2又は請求項3に記載の、スピンドルモータ。
- 前記貫通孔は、上端部において、軸方向下側に向かうに従って内径が小さくなる孔傾斜部を有する、請求項1から請求項12のいずれか一項に記載の、スピンドルモータ。
- 請求項1から請求項13のいずれか一項に記載のスピンドルモータと、
前記スピンドルモータにより前記中心軸を中心として回転するディスクと、
前記ディスクに対して情報の読み取り及び書き込みの少なくとも一方を行うアクセス部と、
前記スピンドルモータと、前記ディスクと、前記アクセス部と、を収容する筐体と、を備えるディスク駆動装置。 - 前記筐体の内部に空気よりも低密度の気体が充填されている、請求項14に記載のディスク駆動装置。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH09182357A (ja) * | 1995-12-27 | 1997-07-11 | Toshiba Lighting & Technol Corp | 動圧軸受け構造のモータおよびモータ組込機器 |
JP2007185073A (ja) * | 2006-01-10 | 2007-07-19 | Nippon Densan Corp | 軸受機構、モータおよび記録ディスク駆動装置 |
JP2009216183A (ja) * | 2008-03-11 | 2009-09-24 | Nippon Densan Corp | 流体動圧軸受装置、スピンドルモータ、及びディスク駆動装置 |
JP2012152098A (ja) * | 2010-12-27 | 2012-08-09 | Nippon Densan Corp | スピンドルモータ、ディスク駆動装置およびスピンドルモータの製造方法 |
DE102017119497A1 (de) * | 2017-08-25 | 2019-02-28 | Minebea Mitsumi Inc. | Fluiddynamisches Lagersystem |
-
2022
- 2022-03-31 US US18/283,444 patent/US20240177736A1/en active Pending
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH09182357A (ja) * | 1995-12-27 | 1997-07-11 | Toshiba Lighting & Technol Corp | 動圧軸受け構造のモータおよびモータ組込機器 |
JP2007185073A (ja) * | 2006-01-10 | 2007-07-19 | Nippon Densan Corp | 軸受機構、モータおよび記録ディスク駆動装置 |
JP2009216183A (ja) * | 2008-03-11 | 2009-09-24 | Nippon Densan Corp | 流体動圧軸受装置、スピンドルモータ、及びディスク駆動装置 |
JP2012152098A (ja) * | 2010-12-27 | 2012-08-09 | Nippon Densan Corp | スピンドルモータ、ディスク駆動装置およびスピンドルモータの製造方法 |
DE102017119497A1 (de) * | 2017-08-25 | 2019-02-28 | Minebea Mitsumi Inc. | Fluiddynamisches Lagersystem |
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