WO2004077643A1 - 動圧気体軸受モータ - Google Patents
動圧気体軸受モータ Download PDFInfo
- Publication number
- WO2004077643A1 WO2004077643A1 PCT/JP2004/002149 JP2004002149W WO2004077643A1 WO 2004077643 A1 WO2004077643 A1 WO 2004077643A1 JP 2004002149 W JP2004002149 W JP 2004002149W WO 2004077643 A1 WO2004077643 A1 WO 2004077643A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dynamic pressure
- pressure gas
- gas bearing
- support shaft
- motor
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/107—Grooves for generating pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
- F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
- F16C17/107—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure with at least one surface for radial load and at least one surface for axial load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1005—Construction relative to lubrication with gas, e.g. air, as lubricant
- F16C33/101—Details of the bearing surface, e.g. means to generate pressure such as lobes or wedges
- F16C33/1015—Pressure generating grooves
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Definitions
- the present invention relates to a bearing for a small motor, and more particularly to a bearing suitable for a precision rotation motor that requires positioning accuracy in the radial and thrust directions such as a hard disk drive device (hereinafter abbreviated as HDD device).
- HDD device a hard disk drive device
- spindle motors Small motors used in HDD devices, so-called spindle motors, require high-precision rotation in order to read, write, and recall information. Recently, in particular, due to the demand for higher recording density, strict accuracy is required for positioning in the radial and thrust directions, and further, due to the demand for energy savings associated with downsizing of HDD devices, Emphasis is placed on reducing motor current consumption.
- pole bearings have been used in the past.
- the pole bearing is replaced with a hydrodynamic oil type sliding bearing using lubricating oil.
- lubricating oil Being begun to be.
- dynamic pressure oil bearing motors that use oil are often affected by the characteristics of the oil, and there are concerns about the effects of increased current consumption at low temperatures, oil leakage at high speed rotation, and oil deterioration. If the same hydrodynamic bearing is used to cope with this, it may be possible to use gas instead of oil as a lubricant. ing.
- the motor rotor is divided into the inner periphery of the motor rotor and the outer periphery of the stepped columnar support shaft.
- a configuration has been proposed in which a radial dynamic pressure gas bearing comprising a surface and a thrust dynamic pressure gas bearing comprising a support shaft upper surface and a bottom surface of the insertion portion of the motor rotating body are supported (for example, Japanese Patent Laid-Open No. 2000-101). 0—5 0 5 6 8).
- the radial dynamic pressure gas bearing in order to increase the length of the radial dynamic pressure gas bearing, it has a predetermined gap with respect to the radial stator coil group concentric with the support shaft, and is provided on the outer periphery of the lower side of the disk receiving portion of the motor rotor.
- the motor drive unit is configured by a mouth / outlet magnet (see, for example, Japanese Patent Laid-Open No. 2000-0135 2726).
- the conventional dynamic pressure gas bearing module shown in the above Japanese Patent Laid-Open No. 2 0 00-5 0 5 6 8 is a magnetic recording medium.
- the clamp screw holes that are essential to hold the disc are not considered. That is, for example, as shown in FIG. 13, a clamp screw hole 53 is formed at a position above the thrust dynamic pressure gas bearing 52 in the upper surface 51 a of the motor rotor 51. If you want to drill the clamp screw hole 5 3 well The upper surface portion of the motor rotating body 51 must be thickened, and the length of the radial dynamic pressure gas bearing 5 4 is shortened only by forming the upper surface portion 51a of the motor rotating body 51 thick.
- reference numeral 5 5 denotes a support shaft erected on the mounting base 5 6.
- a thrust dynamic pressure gas bearing 5 2 is constituted by the lower surface of the upper surface portion 5 1 a.
- 5 7 is a stator coil group attached concentrically with the support shaft 55
- 5 8 is a rotor magnet attached to the outer periphery of the lower end of the motor rotor 51.
- this clamp screw hole 53 is formed by penetrating the upper surface portion 51a of the motor rotor 51 to the bottom, the screw face 53a can be formed in all the lengths of the clamp screw hole 53.
- this clamp screw hole 5 3 is drilled, the lower surface of the upper surface portion 5 1 a of the motor rotor 5 1 is deformed by the force during drilling, and a portion that rises or protrudes is generated.
- the clamp screw hole 5 3 sealed for sealing Because it is necessary to affix a stop seal (not shown), as shown in Fig. 14, the lower surface of the upper surface portion 5 1 a of the motor rotor 51 and the upper surface of the large diameter portion 5 6 of the support shaft 55 A thrust dynamic pressure gas bearing cannot be formed between the two.
- the present invention solves the above-mentioned problem. Even if a clamp screw hole for allowing a screw that can hold a disk to pass through is formed in the upper surface portion of the motor rotating body, the radial dynamic pressure gas bearing can be a thrust dynamic pressure. It is an object of the present invention to provide a dynamic pressure gas bearing motor that can secure a gas bearing with a sufficient length and diameter and can obtain sufficient bearing rigidity. Means for solving the problem
- the cylindrical rotating shaft has a bottomed cylindrical shape so that a columnar supporting shaft is erected on a mounting base and the outer periphery of the supporting shaft is covered from above and from the side with a gap.
- a low magnet is provided on the motor rotor or a member fixed to the motor rotor, and a stator coil group is formed concentrically with the support shaft so as to face the low magnet.
- the upper surface portion of the support shaft faces downward.
- Recessed concave shape Forming a convex portion that fits into the concave shape portion with a gap at a portion facing the concave shape portion of the support shaft in the motor rotating body, and forming an inner periphery of the motor rotating body.
- a radial dynamic pressure gas bearing is configured by the surface and the outer peripheral surface of the support shaft, and a thrust dynamic pressure gas bearing is configured by the convex shape portion of the motor rotating body and the concave shape portion of the support shaft.
- a pressure gas bearing is arranged below the upper end of the radial dynamic pressure gas bearing, and a clamp screw hole for holding a disk which is a magnetic recording medium is recessed in the support shaft in the upper surface portion of the motor rotor. It is characterized in that it is formed in the upper direction of the shape part.
- a clamp screw hole for inserting a screw that can hold the disk well can be formed on the upper surface of the motor rotor, while the convex part of the motor rotor and the concave part of the support shaft are formed.
- a thrust dynamic pressure gas bearing can be constituted by the portion, and the radial dynamic pressure gas bearing can be made long.
- the invention according to claim 2 is the dynamic pressure gas bearing motor according to claim 1, wherein the clamp screw hole is provided at the outer peripheral side of the upper surface portion of the motor rotating body at the outer peripheral side portion. It is characterized in that it is formed so as to penetrate from above.
- the clamp screw hole is formed through the upper surface of the motor rotor, so that the thickness of the upper surface of the motor rotor itself becomes the effective screw depth and the thickness of the upper surface of the motor rotor.
- the clamp screw hole is provided on the outer peripheral side of the upper surface of the motor rotating body at the outer peripheral portion, so that a bulging portion or the like at the time of drilling is generated below this portion. Even when a sealing seal is attached to the clamp screw hole, the convex part of the motor rotating body and the support shaft A thrust dynamic pressure gas bearing can be configured without hindrance by the concave portion.
- the invention according to claim 3 is the dynamic pressure gas bearing motor according to claim 1, wherein the clamp screw hole is located at a position corresponding to the convex shape portion of the upper surface portion of the motor rotating body. It is formed in a bag hole shape so as not to penetrate.
- the invention according to claim 4 is the dynamic pressure gas bearing motor according to any one of claims 1 to 3, wherein the support shaft has a large-diameter portion having a diameter larger than a joint portion with the mounting base.
- the motor rotating body is provided with a thrust scalar with a gap so as to sandwich the large-diameter portion of the support shaft from below, and the lower surface of the large-diameter portion of the support shaft and the upper surface of the thrust shaft are Is also characterized by constituting a thrust dynamic pressure gas bearing.
- a thrust dynamic pressure gas bearing can also be configured by the lower surface of the large-diameter portion of the support shaft and the upper surface of the thrust collar.
- the invention according to claim 5 is the dynamic pressure gas bearing motor according to any one of claims 1 to 3, wherein the support shaft includes a cylindrical part erected on the mounting base, and an upper end of the cylindrical part.
- a columnar member having a low magnet on the outer periphery is provided, a steer coil group is provided on the inner side of the cylindrical portion of the support shaft so as to face the mouth magnet, and an inner peripheral surface of the motor rotating body.
- cylinder of the support shaft A radial dynamic pressure gas bearing is constituted by the outer peripheral surface of the shape portion, and a thrust dynamic pressure gas bearing is constituted by the convex shape portion of the motor rotor and the upper surface of the thrust plate portion as the concave shape portion of the support shaft. It is composed.
- the motor drive unit consisting of the rotor magnet and the coil group can be arranged inside the support shaft, and the radial dynamic pressure gas bearing can be made long, which is sufficient. Bearing rigidity can be generated.
- the invention according to claim 6 is the dynamic pressure gas bearing motor according to claim 5, wherein the cylindrical member has a bowl-like shape facing the lower surface portion of the thrust plate portion at a position above the mouthpiece magnet.
- a thrust collar part is provided, and a thrust dynamic pressure gas bearing is constituted by the lower surface part of the thrust plate part and the upper surface of the thrust collar part.
- the thrust dynamic pressure gas bearing can also be configured by the lower surface portion of the thrust plate portion and the upper surface of the thrust collar portion.
- the invention according to claim 7 is characterized in that a columnar support shaft is erected on a mounting base, and a bottomed cylindrical motor rotor is provided so as to cover the outer periphery of the support shaft from above and from the side with a gap.
- a magnet is provided on the member fixed to the motor rotating body or the motor rotating body, and a steering coil group is formed concentrically with the support shaft so as to face the low magnet.
- a hydrodynamic gas bearing motor supported by a radial dynamic pressure gas bearing and a thrust dynamic pressure gas bearing formed with the motor rotor facing the gap, and an inner peripheral surface of the motor rotor and the A radial dynamic pressure gas bearing is constituted by the outer peripheral surface of the support shaft, and the upper surface of the support shaft.
- a bottom surface portion of the motor rotating body that faces the upper surface portion of the support shaft constitutes a thrust dynamic pressure gas bearing, and a screw hole plate having a clamp screw hole for holding a disk that is a magnetic recording medium.
- the motor is fixed to the upper surface of the motor rotating body.
- the clamp screw hole can be formed in the screw plate by forming the clamp screw hole in the screw plate without directly forming the clamp screw hole in the upper surface of the motor rotating body. Incomplete threaded portions of the pilot hole, i.e., where the threaded surface is not formed but only the round hole is formed, even if the specified threaded hole depth is formed, The plate thickness of the part can be reduced. As a result, the maximum diameter and length of the radial dynamic pressure gas bearing can be secured within the motor rotor, sufficient bearing rigidity can be obtained, and direct contact with the motor rotor constituting the dynamic pressure air bearing. Because there is no screw hole
- the motor rotor and screw hole plate can be cleaned in a separate process, and substances such as cutting oil and processing residues remaining in the clamp screw hole contaminate the bearings of the motor rotor. This reduces reliability and increases the reliability of HDD devices.
- the invention according to claim 8 is the dynamic pressure gas bearing motor according to claim 7, wherein the support shaft has a stepped cylindrical shape having a large diameter portion larger in diameter than a joint portion with the mounting base.
- a thrust dynamic pressure gas bearing is configured by the upper surface portion of the large-diameter portion and the bottom surface portion of the motor rotating body that faces the upper surface portion of the support shaft, and a gap is provided so as to sandwich the large-diameter portion of the support shaft from below.
- a thrust collar is provided on the rotor rotating body in a state of having a thrust, and the thrust movement is also caused by the lower surface of the large-diameter portion of the support shaft and the upper surface of the thrust collar.
- a pressurized gas bearing is constructed.
- a thrust dynamic pressure gas bearing can also be configured by the lower surface of the large-diameter portion of the support shaft and the upper surface of the thrust collar.
- the invention according to claim 9 is the dynamic pressure gas bearing motor according to claim 7, wherein the support shaft is fixed to the cylindrical portion erected on the mounting base and the inner periphery of the upper end portion of the cylindrical portion.
- a disc-shaped thrust plate portion having a central hole portion, penetrating the central hole portion of the thrust plate of the support shaft at the axial center position of the motor rotating body, and having a mouth on the outer periphery.
- a cylindrical member having a gnet is provided, a steer coil group is provided on the inner side of the cylindrical portion of the support shaft so as to face the rotor magnet, and a thrust plate is disposed above the rotor magnet in the cylindrical member.
- a radial dynamic pressure gas bearing is formed by the inner peripheral surface of the motor rotating body and the outer peripheral surface of the cylindrical portion of the support shaft.
- Convex part of rotating body and front A thrust dynamic pressure gas bearing is constituted by the upper surface of the thrust plate portion as the concave portion of the support shaft, and a thrust dynamic pressure gas bearing is also constituted by the lower surface portion of the thrust plate portion and the upper surface of the thrust collar portion. It is characterized by that.
- the thrust dynamic pressure gas bearing can also be configured by the lower surface portion of the thrust plate portion and the upper surface of the thrust collar portion.
- the invention according to claim 10 is a claim?
- the screw hole plate has a ring shape, and a plurality of clamp screw holes are formed so as to penetrate each other at intervals. . With this configuration, positioning when fixing the screw hole plate to the motor rotating body can be performed with high accuracy.
- the invention according to claim 11 is the dynamic pressure pneumatic bearing motor according to any one of claims 7 to 9, wherein the screw hole plate is formed through one clamp screw hole, and a plurality of screw holes The plates are fixed at intervals on the upper surface of the motor rotor. '
- the upper surface portion of the support shaft is formed in a concave shape that is recessed downward, and the portion facing the concave shape portion of the support shaft in the model rotating body
- a convex-shaped portion that fits into the concave-shaped portion with a gap is formed, and a radial dynamic pressure gas bearing is configured by the inner peripheral surface of the motor rotating body and the outer peripheral surface of the support shaft
- a thrust dynamic pressure gas bearing is constituted by the convex shape portion of the evening rotator and the concave shape portion of the support shaft, and the thrust dynamic pressure gas bearing is disposed below the upper end of the radial dynamic pressure gas bearing.
- a clamp screw hole for holding a disk as a medium is formed at a position above the concave shape part of the support shaft on the upper surface of the motor rotating body so that a screw that can hold the disk well can be passed.
- Set the clamp screw hole While it is possible to form the upper surface portions of the rotary body, the radial dynamic pressure gas bearing The diameter and length can be increased within the motor rotor. As a result, sufficient bearing rigidity can be ensured, current consumption at low temperatures can be reduced, and motion that can be sufficiently used even at high speeds.
- a pressurized gas bearing motor can be provided.
- FIG. 1 is a front sectional view of a dynamic pressure gas bearing motor according to Embodiment 1 of the present invention.
- FIG. 2 is a front sectional view of another dynamic pressure gas bearing module according to the first embodiment.
- FIG. 3 is a plan view of the support shaft of the dynamic pressure gas bearing motor according to Embodiment 1 shown in FIG.
- FIG. 4 is a front view of the support shaft of the dynamic pressure gas bearing motor.
- FIG. 5 is a front sectional view of a motor rotating body according to another embodiment of the dynamic pressure gas bearing motor.
- FIG. 6 is a bottom view of a motor rotating body according to another embodiment of the dynamic pressure gas bearing motor.
- FIG. 7 is a front sectional view of a dynamic pressure gas bearing motor according to Embodiment 2 of the present invention.
- FIG. 8 is a front sectional view of another dynamic pressure gas bearing module according to the second embodiment.
- FIG. 9 is a front sectional view of a dynamic pressure gas bearing motor according to Embodiment 3 of the present invention.
- FIG. 10 is a front sectional view of a dynamic pressure gas bearing module according to Embodiment 4 of the present invention.
- FIG. 11 is a plan view of a rotating body of a dynamic pressure gas bearing according to Embodiments 3 and 4 of the present invention.
- FIG. 12 is a plan view of a motor rotor of another dynamic pressure gas bearing motor according to Embodiments 3 and 4 of the present invention.
- Fig. 13 is a front sectional view of a conventional dynamic pressure gas bearing motor.
- Fig. 14 is a front sectional view of another conventional dynamic pressure gas bearing motor. Embodiments of the present invention will be described below with reference to the drawings.
- the dynamic pressure gas bearing motor As shown in FIG. 1, the dynamic pressure gas bearing motor according to the first embodiment is Then, the motor rotor 3 is divided into a radial dynamic pressure gas bearing 6 composed of the inner peripheral surface of the motor rotor 3 and the outer peripheral surface of the large-diameter portion 2 b of the support shaft 2, and the concave-shaped portion 2 of the support shaft 2.
- the thrust dynamic pressure is supported by a thrust dynamic pressure gas bearing 7 A consisting of the upper surface of a and the concave portion 2 a.
- the gas bearing 7A is different from the above-described conventional fluid gas bearing motor in that the gas bearing 7A is disposed below the upper end of the radial dynamic pressure gas bearing 6.
- the support shaft 2 has a stepped cylindrical shape having a large-diameter portion 2b in the upper portion and a thin-diameter portion 2c in the lower portion, and the small-diameter portion 2c of the support shaft 2
- the cylindrical part 2b of the support shaft 2 has a bottomed cylindrical shape so as to cover the outer periphery from above and from the side with a gap (a shape in which only the upper surface part is closed like a lid and the lower surface part is opened).
- the rotator 3 is fitted.
- a rotor magnet 5 is provided on the inner periphery of the flange portion provided at the lower end of the motor rotating body 3, and the rotor magnet 5 is opposed to the outer periphery of the support cylinder portion 1 a of the mounting base 1 so as to face the rotor magnet 5.
- a coil group 4 is provided, and the rotor magnet 5 and the steer coil group 4 constitute a motor drive unit.
- the upper surface portion of the large-diameter portion 2b of the support shaft 2 is formed in a concave shape that is depressed downward, and the motor rotor 3 faces the concave shape portion 2a of the support shaft 2 A convex portion 3a that fits into the concave portion 2b with a gap between the inner peripheral surface of the motor rotor 3 and the outer peripheral surface of the large-diameter portion 2b of the support shaft 2.
- a thrust dynamic pressure gas bearing 7 A is constituted.
- the thrust dynamic pressure gas bearing 7A is disposed below the upper end of the radial dynamic pressure gas bearing 6, and a clamp screw hole 3c for holding a disk as a magnetic recording medium is provided on the motor rotating body. 3 is formed at the upper position of the concave portion 2 a of the support shaft 2 in the upper surface portion 3 b.
- the clamp screw hole 3c is formed in a concave shape of the support shaft 2 at a position on the outer peripheral side of the convex portion 3a on the upper surface portion 3b of the motor rotating body 3.
- the part 2a is formed so as to penetrate from above.
- the motor rotating body 3 is provided with a thrust collar 8 with a gap so as to sandwich the large-diameter portion 2b of the support shaft 2 from below, and the large-diameter portion 2b lower surface of the support shaft 2 and the thrust collar
- the thrust dynamic pressure gas bearing 7 B is also constituted by the upper surface of 18.
- the motor rotating body 3 is supported by a radial dynamic pressure gas bearing 6 composed of the inner peripheral surface of the motor rotating body 3 and the outer peripheral surface of the support shaft 2, and the concave portion 2a of the support shaft 2 It is supported by a thrust dynamic pressure gas bearing 7 (7 A, 7 B) composed of a convex portion 3 a of the motor rotating body 3 and a lower surface of the large-diameter portion 2 b of the support shaft 2 and an upper surface of the thrust collar 8.
- the radial dynamic pressure gas bearing 6 has a dynamic pressure generating groove 6 c shown in FIGS. 4 and 5 on either the inner peripheral surface of the motor rotating body 3 or the outer peripheral surface of the support shaft 2.
- the dynamic pressure gas bearing 7 (7A, 7B) either the convex portion 3a of the motor rotor 3 or the concave portion 2a of the support shaft 2, and the large diameter portion 2b of the support shaft 2
- a dynamic pressure generating groove 7 c shown in FIGS. 3 and 6 is provided on either the lower surface or the upper surface of the thrust collar 8.
- the diameter of the radial dynamic pressure gas bearing portion 6 of the support shaft 2 is from 17 mm to 2 mm.
- the diameter is set to 3 mm, preferably about 21 mm, it is possible to generate a large radial bearing rigidity while ensuring the strength of the motor rotating body 3, and further, the concave portion 2a of the support shaft 2
- the depth from the upper surface edge is 0.5 mm to 3 mm, preferably about 1 mm, so that the convex part 3 a of the motor rotating body 3 and the concave part 2 a of the support shaft 2 can be made with high accuracy.
- the effective screw depth of the clamp screw hole 3c is 1 mm to 5 mm, preferably about 2 mm, so that a large radial bearing rigidity can be obtained with the strength of the motor rotating body 3 secured.
- the diameter of the radial dynamic pressure gas bearing 6 of the support shaft 2 is preferably 14 mm to 18 mm, preferably The diameter of the pitch circle of the clamp screw hole 3c is about 10 mm to 16 mm, preferably about 14 mm. Is obtained.
- FIG. 3 is a plan view of the support shaft 2
- FIG. 4 is a front view of the support shaft 2
- FIG. 5 is a front sectional view of the motor rotating body
- FIG. 6 is a bottom view of the motor rotating body. Shows the case where the shape of the dynamic pressure generating grooves 6 c and 7 c is a herringbone groove shape, the dynamic pressure generating grooves 6 c and 7 c The shape is not limited to the herringbone groove shape.
- surface treatment such as plating, DLC (diamond-like carbon), ion nitriding, etc. is applied to one or both surfaces of the radial dynamic pressure gas bearing 6 and the thrust dynamic pressure gas bearing 7 to provide wear resistance and friction coefficient. Reduction can be achieved.
- the motor rotor 3 is rotated with the radial dynamic pressure gas bearing 6 composed of the inner peripheral surface thereof and the large diameter portion 2 b outer peripheral surface of the support shaft 2, and the concave shape portion 2 a of the support shaft 2 and the motor. It is supported by a thrust dynamic pressure gas bearing 7 A consisting of a convex part 3 a of the body 3 and the thrust dynamic pressure gas bearing 7 A is located below the upper end of the radial dynamic pressure gas bearing 6 to rotate the motor. Even if the clamp screw hole 3c is provided on the upper surface 3b of the body 3, the thickness of the upper surface 3b of the motor rotor 3 can be reduced, and the length of the radial dynamic pressure gas bearing 6 can be reduced.
- the thrust dynamic pressure gas bearing 7 can be configured without hindrance by 3 a and the concave portion 2 a of the support shaft 2.
- FIG. 2 is a front sectional view showing a dynamic pressure gas bearing module according to another embodiment.
- the clamp screw hole 3 c is not penetrated to the lower surface of the convex portion 3 a at a position corresponding to the convex portion 3 a on the upper surface portion 3 b of the motor rotating body 3.
- the bag has a hole shape.
- the area of the thrust dynamic pressure gas bearing 7 A formed by the convex portion 3 a of the motor rotor 3 and the concave portion 2 a of the support shaft 2 can be further increased. It is possible to provide a hydrodynamic gas bearing motor that can ensure sufficient bearing rigidity regardless of the current consumption, reduce current consumption at low temperatures, and can be used even at high speeds. -Here, specifically, in a dynamic pressure gas bearing module for a standard disk inner diameter of about 25 mm in a 3.5 inch HDD device, from the top end of the concave portion 2a of the support shaft 2 Depth from 0.5 mm to 3 mm, preferably
- the convex shaped part 3 a of the motor rotor 3 and the concave shaped part 2 a of the support shaft 2 can be machined with high accuracy, and the clamp screw hole 3 c
- the effective screw depth of 1 mm to 5 mm, preferably about 2 mm, can generate an effective clamping force, and the pitch diameter of the clamp screw hole 3 c can be from 1 O mm to 2 mm.
- O mm preferably about 15 mm, it is possible to increase the area of the thrust dynamic pressure gas bearing 7 with the clamper secured.
- the support shaft 2 is fixed in a concave shape on the inner periphery of the cylindrical portion 2 d erected on the mounting base 1 and the upper end of the cylindrical portion 2 d.
- a disc-shaped thrust plate portion 2 f having a central hole portion 2 e.
- the upper surface of the thrust plate portion 2 ⁇ forms a concave shaped portion 2 a
- the concave shaped portion 2 a has a gap so that the convex shaped portion 3 a of the motor rotating body 3 is fitted and arranged.
- a cylindrical member 9 having a rotor magnet 5 on the outer periphery is provided at the axial center position of the motor rotating body 3 so as to pass through the central hole portion 2 e of the thrust plate portion 2 f.
- a hook-shaped thrust collar portion 9 a facing the lower surface of the thrust plate portion 2 f is provided above the mouthpiece magnet 5 in the mouth.
- the thrust dynamic pressure gas bearing 7 C is also constituted by the lower surface portion of the thrust plate portion 2 f and the upper surface of the thrust collar portion 9 a.
- a cylindrical portion 2d of the support shaft 2 is erected on the mounting base 1 by press-fitting or bonding, and a thrust plate portion is formed on the inner periphery of the upper end portion of the cylindrical portion 2d.
- 2 ⁇ is fixed in a concave shape.
- the cylindrical part 2 d and the thrust plate part 2 f are covered with a bottomed cylindrical shape so as to cover from above and from the side with a gap. Only the upper surface portion is closed in a lid shape, and the lower surface portion is opened).
- a rotor magnet 5 is attached to the outer periphery of the lower part of the cylindrical member 9 fixed at the axial center position of the motor rotor 3, and the mouthpiece magnet 5 is connected to the cylindrical portion 2d inside the support shaft 2.
- a steering coil group 4 is provided oppositely, and the rotor magnet 5 and the steering coil group 4 constitute a motor drive unit.
- the cylindrical member 9 has an upper portion of the rotor magnet 5.
- a saddle-shaped thrust scalar part 9 a is provided at a position so as to sandwich the thrust plate part 2 f.
- the motor rotating body 3 is supported by a radial dynamic pressure gas bearing 6 composed of the inner peripheral surface of the motor rotating body 3 and the outer peripheral surface of the cylindrical portion 2d of the support shaft 2, and the thrust plate portion 2f Thrust dynamic pressure gas bearing 7 (7) consisting of the concave part 2a consisting of the upper surface, the convex part 3a of the motor rotor 3, and the lower surface part of the thrust plate part 2f and the upper surface of the thrust collar part 9a A, 7 C).
- the radial dynamic pressure gas bearing 6 has a dynamic pressure generating groove on either the inner peripheral surface of the motor rotor 3 or the outer peripheral surface of the cylindrical portion 2 d of the support shaft 2, and has a thrust motion.
- the thrust dynamic pressure gas bearing 7 A is arranged below the upper end of the radial dynamic pressure gas bearing 6 to hold the disk as a magnetic recording medium.
- Clamp screw A hole 3 c is formed at a position above the concave portion 2 a of the support shaft 2 in the upper surface portion 3 b of the motor rotating body 3.
- the clamp screw hole 3c is penetrated through the concave portion 2a of the support shaft 2 from above at the outer peripheral side of the convex portion 3a of the upper surface portion 3b of the motor rotating body 3. Formed.
- the upper screw 3c of the motor rotating body 3 b is provided with the clamp screw hole 3c, the upper surface 3 of the motor rotating body 3 b
- the thickness of the radial dynamic pressure gas bearing 6 can be reduced, the length of the radial dynamic pressure gas bearing 6 can be increased, sufficient bearing rigidity can be generated, and the dynamic pressure gas bearing motor has high rotational accuracy.
- the clamp screw hole 3c is provided on the outer peripheral side of the convex portion 3a on the upper surface 3b of the motor rotor 3, so that a raised part or the like at the time of drilling is generated below this point.
- the thrust dynamic pressure gas bearing 7 is formed by the convex part 3a of the motor rotor 3 and the concave part 2a of the support shaft 2.
- the motor drive unit consisting of the rotor magnet 5 and the coil group 4 is arranged inside the support shaft 2, radial motion can be achieved.
- the length of the pressure gas bearing 6 can be increased, sufficient bearing rigidity can be generated, and a dynamic pressure gas bearing module with high rotational accuracy can be provided.
- the clamp screw hole 3c is positioned at the position corresponding to the convex portion 3a on the upper surface portion 3b of the motor rotor 3. Further, it may be formed in a bag hole shape so as not to penetrate to the lower surface of the convex shape portion.
- the convex shape portion 3 a of the motor rotating body 3 and the concave shape portion 2 a of the support shaft 2 The area of the thrust dynamic pressure gas bearing 7 A configured by the above can be further increased, sufficient bearing rigidity can be ensured regardless of the attitude of the motor, current consumption at low temperatures can be reduced, and higher speeds can be achieved. It is possible to provide a dynamic pressure gas bearing motor that can be used sufficiently during rotation.
- the support shaft 2 has a stepped cylindrical shape having a large-diameter portion 2 b in the upper portion and a thin-diameter portion 2 c in the lower portion.
- the small-diameter portion 2c is erected on the mounting base 1 by press-fitting or bonding.
- the large-diameter part 2b of the support shaft 2b Bottom cylindrical shape so that the outer periphery is covered from above and from the side with a gap (only the top part is a lid And the lower surface portion of the motor rotating body 3 is fitted, the upper surface portion of the large diameter portion 2 b of the support shaft 2, and the support shaft large diameter portion of the motor rotating body 3.
- a thrust dynamic pressure gas bearing 7A is constituted by the bottom surface facing the top surface of 2b (that is, the bottom surface of the top surface 3b of the motor rotor 3).
- a rotor magnet ⁇ 5 is provided on the inner periphery of the heel portion provided at the lower end of the motor rotor 3, and the support cylinder portion 1a of the mounting base 1a into which the small diameter portion 2c of the support shaft 2 is fitted.
- a Steady Coil group 4 is provided so as to oppose the mouth magnet 5, and the Motor magnet 5 and the Steer coil group 4 constitute a motor drive unit.
- the thickness of the screw hole plate 1 1 is 1 mm to 5 mm, preferably about 2 mm.
- the screw hole plate 11 has, for example, a ring shape as shown in FIG. 11, and a plurality of clamp screw holes 3 c are formed so as to penetrate each other at intervals.
- the motor rotating body 3 is provided with a thrust collar 8 with a gap so as to sandwich the large-diameter portion 2b of the support shaft 2 from below, and the lower surface of the large-diameter portion 2b of the support shaft 2 and A thrust dynamic pressure gas bearing 7 B is also formed on the upper surface of the thrust collar 8.
- the motor rotor 3 is supported by a radial dynamic pressure gas bearing 6 composed of the inner peripheral surface of the motor rotor 3 and the outer peripheral surface of the support shaft 2, and the upper surface portion of the large-diameter portion 2b of the support shaft 2 And a thrust dynamic pressure gas bearing 7 (7 A, 7 B) consisting of the bottom surface of the upper surface portion 3 b of the motor rotating body 3, the large diameter portion 2 b of the support shaft 2, and the lower surface of the thrust shaft 8. It is supported.
- the radial dynamic pressure gas bearing 6 has a dynamic pressure generating groove on either the inner peripheral surface of the motor rotating body 3 or the outer peripheral surface of the support shaft 2, and the thrust dynamic pressure gas bearing 7 (7A, 7B ), The upper surface portion of the large diameter portion 2 b of the support shaft 2 and the bottom surface of the upper surface portion 3 b of the motor rotating body 3, the lower surface of the large diameter portion 2 b of the support shaft 2, or the upper surface of the thrust collar 8. Either of them has a dynamic pressure generating groove.
- the screw hole plate 1 1 is formed without directly forming the clamp screw hole 3 c in the upper surface portion 3 b of the motor rotor 3.
- the clamp screw hole 3c that penetrates can be formed in the screw hole plate 1 1, and the incomplete threaded portion of the pilot hole in threading, that is, without the formation of the thread surface It is possible to eliminate the part where only the round hole is formed. Even if the specified screw hole depth is formed, the plate thickness of the upper surface portion 3b of the motor rotating body 3 can be reduced. As a result, the diameter and length of the radial dynamic pressure gas bearing 6 can be ensured to the maximum extent in the motor rotor 3, sufficient bearing rigidity can be obtained, and the motor constituting the dynamic pressure gas bearing portion can be obtained.
- the motor rotary body 3 and the screw hole plate 11 can be cleaned in a separate process during the cleaning process, and the cutting oil remaining in the clamp screw hole 3c And processing residue This prevents the surface of the motor rotor 3 from contaminating the surface of the motor rotor 3, increasing the reliability, and reducing the number of substances that may impede the function of the HDD device.
- the screw hole plate 1 1 formed with the clamp screw hole 3 c is not exposed downward from the upper surface portion 3 b of the motor rotor 3, the clamp screw hole 3 c of the screw hole plate 1 1 should not be exposed.
- the large diameter part 2 of the support shaft 2 can be obtained by fixing the screw hole plate 1 1 to the upper surface part 3 b of the motor rotor 3.
- the thrust dynamic pressure gas bearing 7 A can be satisfactorily constituted by the upper surface portion of b and the bottom surface of the upper surface portion 3 b of the motor rotor 3.
- the screw hole plate 11 is formed in a ring shape, and a plurality of clamp screw holes 3 c are formed so as to penetrate each other with a space therebetween. Positioning when fixing to 3 can be performed with high accuracy, and positioning between the clamp screw holes 3c can also be performed with high accuracy.
- screw hole plate 1 1 one having one clamp screw hole 3 c formed therethrough is used, and a plurality of screw hole plates 1 1 are attached.
- the upper surface portion 3 b of the motor rotating body 3 may be fixed with a space therebetween.
- the screw hole plate 11 can be standardized so that the motor rotating body 3 It can also be used for clamps with different mounting pitch diameters for the clamp screw holes 3c on the top surface 3b, and cost can be reduced.
- the support shaft 2 includes a cylindrical part 2 d erected on the mounting base 1, and the cylindrical part 2 d. It consists of a disc-shaped thrust plate portion 2 f fixed to the inner periphery of the upper end portion and having a central hole portion 2 e. And, the bottom surface of the upper surface portion 3 b of the motor rotor 3 is arranged with a gap on the upper surface of the thrust plate portion 2 f.
- a cylindrical member 9 that passes through the central hole 2 e of the thrust plate portion 2 f and has a rotor magnet 5 on the outer periphery is provided at the axial center position of the motor rotating body 3.
- a saddle-shaped thrust collar portion 9 a that faces the lower surface portion of the thrust plate portion 2 f is provided above the rotor magnet 5.
- the thrust dynamic pressure gas bearing 7 C is also constituted by the lower surface portion of the thrust plate base 2 f and the upper surface of the thrust collar portion 9 a.
- a cylindrical portion 2 d of the support shaft 2 is erected on the mounting base 1 by press-fitting or bonding, and a thrust plate is formed on the inner periphery of the upper end portion of the cylindrical portion 2 d.
- Part 2 f is fixed.
- the cylindrical part 2 d and the thrust plate part 2 f have a bottomed cylindrical shape (only the upper part is closed like a lid and the lower part is open) so as to cover the upper part and the side with a gap.
- the motor rotating body 3 of the shape) is fitted.
- a low magnet 5 is attached to the outer periphery of the lower part of the cylindrical member 9 fixed at the axial center position of the motor rotor 3.
- a steering coil group 4 is provided on the inner side of the cylindrical portion 2d of the support shaft 2 so as to face the evening magnet 5.
- the low evening magnet 5 and the steering coil group 4 provide a motor drive unit. Is configured.
- a bowl-shaped thrust collar portion 9 a is provided at a position above the rotor magnet 5 in the cylindrical member 9 so as to sandwich the thrust plate portion 2 f.
- the motor rotating body 3 is supported by a radial dynamic pressure gas bearing 6 composed of the inner peripheral surface of the motor rotating body 3 and the outer peripheral surface of the cylindrical portion 2d of the support shaft 2, and the upper surface of the thrust plate portion 2f
- Thrust dynamic pressure gas bearing 7 (7A, 7C) consisting of upper surface 3b lower surface (bottom surface) of motor rotor 3 and lower surface of thrust plate 2f and upper surface of thrust collar part 9a ).
- the radial dynamic pressure gas bearing 6 has a dynamic pressure generating groove on either the inner peripheral surface of the motor rotating body 3 or the outer peripheral surface of the cylindrical portion 2 d of the support shaft 2.
- the dynamic pressure gas bearing 7 either the upper surface of the thrust plate portion 2 f or the upper surface portion 3 b of the motor rotor 3, and the lower surface portion of the thrust plate portion 2 f or the upper surface of the thrust scalar part 9 a Either has a dynamic pressure generating groove.
- a screw hole plate 11 having a screw hole 3 c for holding a disk as a magnetic recording medium is fixed to the upper surface 3 b of the motor rotor 3.
- the screw hole plate 11 has, for example, a ring shape as shown in FIG. 11, and a plurality of clamp screw holes 3 c are formed so as to penetrate each other at intervals.
- the plate thickness of the upper surface portion 3 b of the motor rotating body 3 can be made thinner.
- the diameter and length of the radial dynamic pressure gas bearing 6 can be ensured to the maximum in the motor rotor 3, sufficient bearing rigidity can be obtained, and the dynamic pressure gas bearing portion can be configured. Since the motor rotor 3 is not directly provided with screw holes, the motor rotor 3 and screw hole plate 1 1 can be cleaned in a separate process during the cleaning process. Residues and other substances do not contaminate the surface of the motor rotor 3 bearings, which increases reliability and reduces the number of substances that can cause functional failures in HDD devices.
- the screw hole plate 11 is formed in a ring shape, and a plurality of clamp screw holes 3 c are formed so as to penetrate each other with a space between each other. Positioning when fixing to the body 3 can be performed with high accuracy, and positioning between the clamp screw holes 3c can also be performed with high accuracy.
- the screw hole plate 1 1 one having one clamp screw hole 3 c formed therethrough is used, and a plurality of screw hole plates 1 1 are attached.
- the upper surface portion 3b of the motor rotating body 3 may be fixed at a distance from each other. According to this configuration, the positioning when the screw hole plate 11 is fixed to the motor rotating body 3 is accurate.
- the screw hole plate 1 1 can be standardized, so that it can be used for clamps with different mounting pitch diameters for the clamp screw holes 3 c on the upper surface 3 b of the motor rotor 3. It can be used and the cost can be reduced.
- the motor drive unit is arranged inside the support shaft 2, the radial dynamic pressure gas bearing 6 can be made long, and sufficient bearing rigidity can be generated.
- a dynamic pressure gas bearing motor with high rotational accuracy can be provided.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Rotational Drive Of Disk (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/543,907 US7294946B2 (en) | 2003-02-25 | 2004-02-24 | Motor using dynamic gas bearings |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-046642 | 2003-02-25 | ||
JP2003046642A JP2004266891A (ja) | 2003-02-25 | 2003-02-25 | 動圧気体軸受モータ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004077643A1 true WO2004077643A1 (ja) | 2004-09-10 |
Family
ID=32923241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/002149 WO2004077643A1 (ja) | 2003-02-25 | 2004-02-24 | 動圧気体軸受モータ |
Country Status (4)
Country | Link |
---|---|
US (1) | US7294946B2 (ja) |
JP (1) | JP2004266891A (ja) |
CN (1) | CN1754297A (ja) |
WO (1) | WO2004077643A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4661211B2 (ja) * | 2004-12-27 | 2011-03-30 | 日本電産株式会社 | スピンドルモータ |
JP4347395B2 (ja) * | 2008-03-13 | 2009-10-21 | ファナック株式会社 | ロータ側から駆動用流体を噴射することにより駆動するスピンドル |
CN102158003B (zh) * | 2011-02-27 | 2013-06-26 | 江西中船航海仪器有限公司 | 一种空气磁力轴承电动机 |
US9181978B2 (en) * | 2013-04-10 | 2015-11-10 | Seagate Technology Llc | Grooved thrust bearing |
JP6435132B2 (ja) * | 2014-08-07 | 2018-12-05 | 川崎重工業株式会社 | 超電導回転機 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1169725A (ja) * | 1997-08-12 | 1999-03-09 | Seiko Instr Inc | スピンドルモータ、及びスピンドルモータを回転体の駆動源とした回転体装置 |
JP2000050568A (ja) * | 1998-07-28 | 2000-02-18 | Nippon Densan Corp | ディスク駆動装置 |
US6219199B1 (en) * | 1997-09-12 | 2001-04-17 | Matsushita Electric Industrial Co., Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
JP2001352726A (ja) * | 2000-06-02 | 2001-12-21 | Victor Co Of Japan Ltd | インナーロータ型スピンドルモータ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3994017A (en) * | 1974-07-01 | 1976-11-23 | International Business Machines Corporation | Random access disk file with axial translation of disks and end plate |
EP0206029B1 (de) * | 1985-06-10 | 1989-10-11 | INTERATOM Gesellschaft mit beschränkter Haftung | Gasstatische Lagerung |
JPS6368187U (ja) * | 1986-10-22 | 1988-05-09 | ||
CA2027225A1 (en) * | 1989-10-27 | 1991-04-28 | Donald James Macleod | Spindle motor assembly for disc drives |
JPH0668439A (ja) * | 1992-08-20 | 1994-03-11 | Ebara Corp | Vtr用ドラムモーター |
US5559382A (en) * | 1992-10-01 | 1996-09-24 | Nidec Corporation | Spindle motor |
US5427456A (en) * | 1994-04-12 | 1995-06-27 | Synektron Corporation | Fluid bearing with asymmetrical groove pattern |
US5658080A (en) * | 1994-12-16 | 1997-08-19 | Nidec Corporation | Motor with a hydro-dynamic bearing |
US5847479A (en) * | 1997-04-15 | 1998-12-08 | Sae Magnetics (H.K.) Ltd. | Self-pressure-balanced hydrodynamic bearing spindle motor |
JPH11218128A (ja) * | 1998-01-30 | 1999-08-10 | Seiko Instruments Inc | スピンドルモータ及び回転体装置 |
-
2003
- 2003-02-25 JP JP2003046642A patent/JP2004266891A/ja active Pending
-
2004
- 2004-02-24 CN CNA2004800048306A patent/CN1754297A/zh active Pending
- 2004-02-24 WO PCT/JP2004/002149 patent/WO2004077643A1/ja active Application Filing
- 2004-02-24 US US10/543,907 patent/US7294946B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1169725A (ja) * | 1997-08-12 | 1999-03-09 | Seiko Instr Inc | スピンドルモータ、及びスピンドルモータを回転体の駆動源とした回転体装置 |
US6219199B1 (en) * | 1997-09-12 | 2001-04-17 | Matsushita Electric Industrial Co., Ltd. | Spindle device having a dynamic-pressure-fluid bearing |
JP2000050568A (ja) * | 1998-07-28 | 2000-02-18 | Nippon Densan Corp | ディスク駆動装置 |
JP2001352726A (ja) * | 2000-06-02 | 2001-12-21 | Victor Co Of Japan Ltd | インナーロータ型スピンドルモータ |
Also Published As
Publication number | Publication date |
---|---|
US7294946B2 (en) | 2007-11-13 |
US20060170297A1 (en) | 2006-08-03 |
JP2004266891A (ja) | 2004-09-24 |
CN1754297A (zh) | 2006-03-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8675304B2 (en) | Disk drive spindle motor with hole volume and component density relationship | |
JP2008167521A (ja) | モータ、記録ディスク駆動装置およびロータハブの製造方法 | |
JP2006017299A (ja) | 流体動圧軸受とこれを備えたスピンドルモータ及び記録ディスク駆動装置 | |
KR20070066918A (ko) | 다기능 소자를 갖는 모터 어셈블리 | |
JP2009008200A (ja) | 流体軸受装置およびスピンドルモータ | |
JP2007155093A (ja) | 軸受機構、モータ、記録ディスク駆動装置およびスリーブ部材の製造方法 | |
US7511398B2 (en) | Motor and recording disk driving device | |
US8757883B2 (en) | Disk drive device | |
JP4387114B2 (ja) | 軸受機構、モータおよびディスク駆動装置 | |
JP2013133865A (ja) | 流体動圧軸受ユニットおよび回転機器 | |
US8608384B2 (en) | Rotating device | |
WO2004077643A1 (ja) | 動圧気体軸受モータ | |
US8837078B2 (en) | Rotating body for fluid dynamic bearing capable of being thinned and being improved in rotational accuracy and method of producing the rotating body for fluid dynamic bearing | |
JP2006170431A (ja) | 流体動圧軸受装置およびこの動圧軸受装置を搭載したスピンドルモータ並びに記録ディスク駆動装置 | |
US8979374B2 (en) | Rotating device | |
KR100970077B1 (ko) | 축받이 유닛 및 축받이 유닛을 탑재한 모터 및 디스크 구동장치 | |
JP2012165627A (ja) | 回転機器 | |
JP2006191734A (ja) | シャフト部材の製造方法 | |
US20140035410A1 (en) | Rotating device | |
US20080278850A1 (en) | Motor | |
US20150340057A1 (en) | Disk drive unit and method of manufacturing the same | |
JP2007185073A (ja) | 軸受機構、モータおよび記録ディスク駆動装置 | |
US20140293482A1 (en) | Rotating device | |
JP2007213629A (ja) | ロータハブ、モータおよび記録ディスク駆動装置 | |
JP2014214814A (ja) | 回転機器及び回転機器の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2006170297 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10543907 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048048306 Country of ref document: CN |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 10543907 Country of ref document: US |