CN102820727B - Motor and disk drive device - Google Patents
Motor and disk drive device Download PDFInfo
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- CN102820727B CN102820727B CN201210021666.6A CN201210021666A CN102820727B CN 102820727 B CN102820727 B CN 102820727B CN 201210021666 A CN201210021666 A CN 201210021666A CN 102820727 B CN102820727 B CN 102820727B
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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- Rotational Drive Of Disk (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The present invention provides a motor and a disk drive device, and the motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and an outer cylindrical portion. The rotary portion includes an inner cylindrical portion, an upper annular portion located on the upper side of the inner cylinder portion, and a lower hub annular portion. An upper seal portion is formed between the shaft portion and the upper portion of the upper annular portion. A first gap is formed between the shaft portion and the upper annular portion and the inner cylinder portion, and a radial dynamic pressure bearing portion is arranged in the first gap. A second gap is formed between the inner cylinder portion and the outer cylinder portion. A third gap is formed between the lower surface of the upper annular portion and the upper surface of the outer cylindrical portion, and a thrust dynamic pressure bearing portion is arranged in the third gap. A lower seal portion is formed between the annular portion of the outer cylindrical portion and the lower hub annular portion. Further, the upper annular portion comprises a communicating path. The communicating path communicates the region between the upper sealing portion and the radial dynamic pressure bearing portion and the region radially closer to the outer side than the thrust dynamic pressure bearing portion in the third gap.
Description
Technical field
The present invention relates to DYN dynamic motor.
Background technology
In the past, as the motor of disk drive device, there is the Bearning mechanism that utilizes hydrodynamic.The Hydrodynamic bearing device of the disclosed Spindle Motor of TOHKEMY 2007-162759 communique has: axle main body and for inserting the sleeve body of tubular of axle main body.Axle main body is fixed in the base plate of motor.Sleeve body is fixed in the rotor of motor.Be provided with the 1st and the 2nd thrust flange (thrust flange) that is positioned at the upside of sleeve body and the ring-type of downside in axle main body.In Hydrodynamic bearing device, between axle main body and sleeve body, form and have journal bearing portion.Form and have thrust bearing division separately and between sleeve body two thrust flange.And, be provided with the intercommunicating pore that two thrust clearances are communicated with in sleeve body.Near the upper and lower opening of intercommunicating pore, be formed with cone seal portion.
, in TOHKEMY 2007-162759 communique, the axial distance between the liquid level of the cone seal portion of upside and the liquid level of the cone seal portion of downside is larger, thereby the pressure differential of upper and lower cone seal portion is large.Therefore,, in the situation that making motor towards all directions, the position of liquid level is significantly variation in cone seal portion.Result complicates the design of the leakage that prevents lubricating oil.
Summary of the invention
The motor of an exemplary aspect of the present invention comprises: stationary part; With supported to the rotating part that can rotate by stationary part.Stationary part comprises: axial region, and it is configured centered by the central axis towards above-below direction; Lower board unit, its bottom from axial region is expanded to radial outside; And urceolus portion, extend upward its outer edge from lower board unit.Rotating part comprises inner cylinder portion, upper annulus and lower hub annulus.Inner cylinder portion is between the outer peripheral face of axial region and the inner peripheral surface of urceolus portion.Upper annulus is expanded to radial outside at the upside of inner cylinder portion.The inner peripheral surface of upper annulus and the outer peripheral face of axial region are opposite, and the upper surface of the lower surface of upper annulus and urceolus portion is opposite.Lower hub annulus the radial outside of urceolus portion from the outer edge of annulus expand downwards.
Sealing on formation between the outer peripheral face of axial region and the top of the inner peripheral surface of upper annulus has, the liquid level of the upside of lubricating oil is positioned at sealing on this.At the downside of upper sealing, between the outer peripheral face of axial region and the inner peripheral surface of upper annulus and between the outer peripheral face of axial region and the inner peripheral surface of inner cylinder portion, form and have from upper sealing continuous the 1st gap downwards.
Between the outer peripheral face of inner cylinder portion and the inner peripheral surface of urceolus portion, form and have the 2nd gap being communicated with the lower end in the 1st gap.Between the lower surface of upper annulus and the upper surface of urceolus portion, form and have the 3rd gap of expanding to radial outside from the upper end in the 2nd gap.
Between the outer peripheral face and lower hub annulus of urceolus portion, form and have lower seal portion, this lower seal portion is communicated with the outer rim in the 3rd gap, and the liquid level of the downside of lubricating oil is positioned at this lower seal portion.
Form and have Journal Bearings in Hydrodynamic Lubrication portion at least a portion in the 1st gap.Form and have thrust dynamic pressure bearing portion at least a portion in the 3rd gap.
Between rotating part and stationary part, produce magnetic action, this magnetic action is to making the direction of floating opposite direction that rotating part floats attract rotating part with thrust dynamic pressure bearing portion.
Upper annulus comprises access, and this access is for getting up the specific thrust hydrodynamic bearing portion in the 3rd gap by the regional connectivity between region and upper sealing and the Journal Bearings in Hydrodynamic Lubrication portion of radial outside.The region and the lubricated oil of access that arrive lower seal portion via the 1st gap, the 2nd gap and the 3rd gap from upper sealing fill up.
According to the present invention, can suppress the generation of the pressure differential between sealing and lower seal portion.
Brief description of the drawings
Fig. 1 is the cutaway view of disk drive device.
Fig. 2 is the cutaway view of motor.
Fig. 3 is the cutaway view of Bearning mechanism.
Fig. 4 is the cutaway view of a part for cap member.
Fig. 5 is the cutaway view that represents a part for Bearning mechanism.
Fig. 6 is the cutaway view of Bearning mechanism.
Fig. 7 is the cutaway view that represents a part for Bearning mechanism.
Fig. 8 is the cutaway view of sleeve part.
Fig. 9 is the vertical view of urceolus portion.
Figure 10 is the upward view that represents another example of inner cylinder portion.
Figure 11 is the cutaway view that represents a part for the motor of another example.
Figure 12 is the cutaway view that represents a part for the motor of the 2nd execution mode.
Figure 13 is the cutaway view that represents a part for the motor of the 3rd execution mode.
Embodiment
In this manual, by the upside of the central axial direction of motor referred to as " upside ", by the downside of the central axial direction of motor referred to as " downside ".In addition, above-below direction does not refer to position relationship and direction when reality is assembled in equipment.And, the direction of the direction parallel with central axis or almost parallel is called to " axially ", by centered by central axis radially referred to as " radially ", by centered by central axis circumferentially referred to as " circumferentially ".
Fig. 1 is the longitudinal section of the disk drive device 1 of the Spindle Motor (below referred to as " motor ") with the 1st exemplary execution mode of the present invention.Disk drive device 1 is so-called hard disk drive.Disk drive device 1 for example comprises: 3 dishes 11, motor 12, access portion 13 and casings 14.Motor 12 makes to coil 11 rotations.Access portion 13 carries out at least one party in reading and writing of information to dish 11.
Casing 14 comprises the 1st cabinet parts 141 of cup-shaped and the 2nd tabular cabinet parts 142.Contain dish 11, motor 12 and access portion 13 in the inner side of the 1st cabinet parts 141.The 2nd cabinet parts 142 is embedded in the 1st cabinet parts 141, forms thus casing 14.The inner space of preferred tray drive unit 1 is the few clean of dust and dust.In the present embodiment, in disk drive device 1, be filled with air.In addition, also can fill helium or hydrogen, can also fill the mist of these gases and air.
3 dishes 11 are fixed on the rotor hub of motor 12 with equal intervals along the central axis J1 direction of motor 2 by fixture 151 and pad 152.Access portion 13 comprises: 131,6 arms 132 of 6 heads and head moving mechanism 133.Head 131 approaches dish 11 and magnetically carries out at least one party in reading and writing of information.Arm 132 supporting head parts 131.Head moving mechanism 133 moves arm 132, makes thus head 131 relatively move with respect to dish 11.According to these structures, head 131 conducts interviews to coiling 11 needed position under the state of dish 11 that approaches rotation.In addition, dish 11 is not limited to 3, can be also more than 1 or 2.
Fig. 2 is the longitudinal section of motor 12.Motor 12 is motors of outer-rotor type.Motor 12 comprises stationary part 2 and rotating part 3.In Fig. 2, hydrodynamic pressure bearing mechanism (hereinafter referred to as " Bearning mechanism ") the mark label 4 that a part for the part by stationary part 2 and rotating part 3 is formed.Rotating part 3 is supported to by stationary part 2 and can centered by the central axis J1 of motor 12, be rotated across lubricating oil 45.
Stationary part 2 comprises: as magnetic part 23, axial region 41 and the lower thrust portion 43 of the base plate 21 of base portion, stator 22, ring-type.The 1st cabinet parts 141 in base plate 21 and Fig. 1 utilizes parts to form, and base plate 21 is parts of casing 14.The support cylindraceous 211 that stator 22 is fixed on base plate 21 around.Lower thrust portion 43 is fixed in the hole portion of the inner side of being located at support 211.Magnetic part 23 is configured on the upper surface of base plate 21.In addition, base plate 21 and the 1st cabinet parts 141 can be also the parts of split.
Rotating part 3 comprises the cap member 42 of rotor hub 31, rotor magnet 32 and ring-type.Rotor hub 31 comprises: roughly sleeve part 5 cylindraceous, cap 311 and cylindrical portion 312.Cap 311 is expanded to radial outside from the top of sleeve part 5.Cylindrical portion 312 is extended downwards from the outer edge of cap 311.Cap member 42 is positioned at the upside of sleeve part 5.In addition, sleeve part 5 also can utilize the parts different from cap 311 and cylindrical portion 312 to form.In this case, sleeve part 5 is fixed in cap 311.Rotor magnet 32 is fixed on the inner side of cylindrical portion 312.Rotor magnet 32 is opposite with stator 22 diametrically.Between stator 22 and rotor magnet 32, produce moment of torsion.
In the axial direction, the magnetic center of stator 22 is positioned at than the magnetic center of rotor magnet 32 position on the lower.And magnetic part 23 is positioned at the below of rotor magnet 32.In motor 12, between rotor magnet 32 and stator 22 and between rotor magnet 32 and magnetic part 23, produce the magnetic action that attracts rotor magnet 32 downwards.The mechanism of the above-mentioned magnetic action of generation being made up of rotor magnet 32, stator 22 and magnetic part 23 is called to " magnetic back pressure mechanism 121 " below.
Cap 311 comprises screwed hole 314, and screwed hole 314 is for the fixing fixture 151 that the dish 11 of Fig. 1 is clamped.Screwed hole 314 is positioned at the top of stator 22, and screwed hole 314 connects cap 311 along the vertical direction.In the time that fixture 151 is arranged on motor 12, as shown in Figure 1, screw 153 is inserted in the through hole and screwed hole 314 of fixture 151, and fixture 151 is fixed on the upper surface of cap 311 thus.
Fig. 3 is by the figure shown in Bearning mechanism 4 amplifications.Bearning mechanism 4 comprises axial region 41, lower thrust portion 43, sleeve part 5, cap member 42 and lubricating oil 45.As previously described, the part that axial region 41 and lower thrust portion 43 are stationary part 2, sleeve part 5 and cap member 42 are parts of rotating part 3.Axial region 41 is by being pressed in the hole portion that is fixed on the inner side that is formed at lower thrust portion 43, and axial region 41 configures towards above-below direction along central axis J1.Axial region 41 for example utilizes the formation such as stainless steel.There is screwed hole 412 on the top of axial region 41.As shown in Figure 1, screw 154 is inserted in the through hole and screwed hole 412 of central portion of the 2nd cabinet parts 142, and the 2nd cabinet parts 142 is fixed in motor 12 thus.
Lower thrust portion 43 comprises lower board unit 431 and urceolus portion 432.Lower thrust portion 43 is for example utilized the formation such as copper or high-strength brass.Lower board unit 431 is expanded towards radial outside from the bottom of axial region 41.Urceolus portion 432 extends upward from the outer edge of lower board unit 431.The top of urceolus portion 432 comprises to the convex edge portion 437 of radial outside expansion.The inclined plane 433 that is provided with downward and tilts to radially inner side at the downside of convex edge portion 437.
In the time of assembling motor 12, the bottom of the outer peripheral face of urceolus portion 432 utilizes bonding agent to be fixed on the inner peripheral surface of the support 211 of base plate 21.Therefore, compared with being pressed into fixing situation, can carry out accurately urceolus portion 432 with respect to base plate 21 location at above-below direction, the precision of the height of motor 12 improves.
Sleeve part 5 comprises inner cylinder portion 51 and flange part 52.Sleeve part 5 for example utilizes the formations such as stainless steel, aluminium, copper.Inner cylinder portion 51 is configured in the roughly space cylindraceous between the outer peripheral face 411 of axial region 41 and the inner peripheral surface 434 of urceolus portion 432.Preferably the thickness of inner cylinder portion 51 is more than 0.5mm and below 1mm, in the present embodiment more preferably 0.75mm.
Flange part 52 is from outstanding to radial outside between inner cylinder portion 51 and cap member 42.In the axial direction, the thickness of preferred flange portion 52 is below 1/2 of height of inner cylinder portion 51.The upper surface 521 of preferred flange portion 52 and lower surface 522 are configured to substantially vertical with central axis J1.Flange part 52 comprises the intercommunicating pore 61 that connects flange part 52 from lower surface 522 towards upper surface 521.The quantity of intercommunicating pore 61 is 1 in the present embodiment.In addition, plural intercommunicating pore 61 also can be set.
Fig. 4 is the cutaway view of a part for cap member 42.In Fig. 4, also show the inner peripheral surface of cap member 42.Cap member 42 comprises the slot part 423 shown in Fig. 3 and Fig. 4 and dynamic pressure groove 424 on inner peripheral surface 422.In Fig. 4, dynamic pressure groove 424 additional shadow are illustrated.Below, in other accompanying drawing, also dynamic pressure groove additional shadow is illustrated.Slot part 423 is the ring-types centered by central axis J1.Along comprising that slot part 423 is cut off the cross section semicircular in shape obtaining by the face of central axis J1.Dynamic pressure groove 424 is spiral-shaped, and dynamic pressure groove 424 is positioned at the downside of slot part 423.In the following description, the upside in inner cylinder portion 51 is referred to as to " upper annulus 47 " to flange part 52 and the cap member 42 of radial outside expansion.The bottom of the inner peripheral surface of upper annulus 47 is that the top of the inner peripheral surface 523 of flange part 52 and the inner peripheral surface of upper annulus 47 is the inner peripheral surface 422 of cap member 42, opposite with the outer peripheral face 411 of axial region 41 diametrically respectively.
The cap 311 of rotor hub 31 comprises wheel hub cylinder portion 53 and lower hub annulus 54.Upper wheel hub cylinder portion 53 is configured to expand upward from the outer edge of flange part 52 roughly cylindric.Cap member 42 is fixed in the inner peripheral surface of wheel hub cylinder portion 53.
Lower hub annulus 54 comprises the stop part 542 of lower hub cylinder portion 541 and ring-type.Lower hub cylinder portion 541 radial outsides in urceolus portion 432 are expanded downwards from the outer edge of flange part 52.In addition, lower hub cylinder portion 541 also can utilize with the parts of flange part 52 or cap 311 splits and form.
As shown in Figure 5, form and have downward and the stage portion 543 of hole enlargement at the inner peripheral surface 541a of lower hub cylinder portion 541., the diameter of the inner peripheral surface 541a of the downside of stage portion 543 is greater than the diameter of upside.At the downside of stage portion 543, stop part 542 is fixed in inner peripheral surface 541a.The upper surface of stop part 542 is that normal face downward contacts with the lower surface 543a of stage portion 543 in the axial direction.The position that the inner peripheral surface 542a of stop part 542 comprises downward and tilts to radially inner side.Between the upper surface of stop part 542 and the outer edge of the lower surface 522 of flange part 52, form and have anticreep gap 68.The end of the convex edge portion 437 of urceolus portion 432 is positioned at anticreep gap 68.In motor 12, even if masterpiece is upward for rotating part 3, because stop part 542 contacts with convex edge portion 437 in the axial direction, thereby prevent that rotating part 3 is moved upward.
In the time of CD-ROM drive motor 12, the rotating part 3 shown in Fig. 3 is rotated with respect to axial region 41 and lower thrust portion 43 across lubricating oil 45.
Fig. 6 is the figure that represents a part for Bearning mechanism 4.Between the outer peripheral face 411 of axial region 41 and the inner peripheral surface 523 of the inner peripheral surface 511 of inner cylinder portion 51 and flange part 52, form and have the radial clearance 62 of extending along the vertical direction.The 1st gap represents radial clearance 62.Preferably radial clearance 62 is about 2～4 μ m at width radially.In the axial direction, between the lower end of inner cylinder portion 51 and lower board unit 431, form gapped 63.Gap 63 is called to " lower splaying 63 " below.
Between the outer peripheral face 512 of inner cylinder portion 51 and the inner peripheral surface 434 of urceolus portion 432, be formed with gap 64 cylindraceous.Gap 64 is called to " cylinder gap 64 " below.The 2nd gap represents cylinder gap 64.The Jing Xia splaying 63, lower end in cylinder gap 64 is communicated with the lower end of radial clearance 62.Cylinder gap 64 is greater than radial clearance 62 at width radially at width radially, and is less than the diameter of intercommunicating pore 61.
In upper annulus 47, between the upper surface 521 of flange part 52 and the lower surface 421 of cap member 42, form gapped 651.Gap 651 is called to " upper communication gap 651 " below.Upper communication gap 651 is along circumferential complete cycle expansion.The lower surface 522 of flange part 52 is gone up the lower surface of annulus 47, opposite in the axial direction with the upper surface 435 of urceolus portion 432, between lower surface 522 and upper surface 435, form gapped 652.Gap 652 is called to " lower thrust clearance 652 " below.The 3rd gap represents lower thrust clearance 652.Lower thrust clearance 652 is expanded to radial outside from the upper end in cylinder gap 64.Upper communication gap 651 and lower thrust clearance 652 are connected by intercommunicating pore 61.In Bearning mechanism 4, radial clearance 62, lower splaying 63, cylinder gap 64, upper communication gap 651, lower thrust clearance 652 and intercommunicating pore 61 form towards radial outside according to this order.
Under the state contacting with the upper surface of stop part 542 at the lower surface of the convex edge portion 437 shown in Fig. 5, lower thrust clearance 652 is substantially equal at axial width: from the lower surface 522 of flange part 52 to the distance the upper surface of stop part 542 and poor at axial width of convex edge portion 437.In addition, in the time of CD-ROM drive motor 12, because the width of lower thrust clearance 652 is enough little, thereby convex edge portion 437 does not contact with stop part 542.In motor 12, can utilize the machining accuracy of the parts in convex edge portion 437 or formation anticreep gap 68, the Breadth Maximum of the thrust clearance 652 when definite masterpiece is upward used for rotating part 3.And, by flange part 52 and lower hub annulus 54 are assembled together with urceolus portion 432, can form lower thrust clearance, can easily carry out the assembling of motor 12.
As shown in Figure 7, between the bottom of inner peripheral surface 422 of cap member 42 and the outer peripheral face 411 of axial region 41, form have on axial clearance 661.Upper communication gap 651 is extended to radial outside continuously from the bottom of upper axial clearance 661.And, radial clearance 62 the downside of upper axial clearance 661 from the bottom of axial clearance 661 extend continuously downwards.The minimum diameter Rs of the inner peripheral surface 422 of cap member 42 is slightly larger than the minimum diameter Rj of the inner peripheral surface of flange part 52 523.In other words, the minimum diameter of the upper annulus 47 in upper axial clearance 661 is greater than the minimum diameter of the upper annulus 47 in radial clearance 62.
Between the bottom of slot part 423 and the outer peripheral face 411 of axial region 41 of the inner peripheral surface 422 at cap member 42, form and have upper seal clearance 662, the width radially of upper seal clearance 662 is along with reducing downward and gradually.In upper seal clearance 662, form and have the capillarity utilized to keep the labyrinth sealing portion of lubricating oil 45.The liquid level of the upside of lubricating oil 45 is positioned at labyrinth sealing portion.And, in the time of CD-ROM drive motor 12, in upper axial clearance 661, utilize the dynamic pressure groove 424 shown in Fig. 4 to form the pumping (pumping as dynamic pressure generating section, drainage) sealing, pumping sealing is for producing pressure downward for lubricating oil 45.Thus, suppressed the upwards movement of seal clearance 662 of lubricating oil 45.Labyrinth sealing portion and pumping sealing are referred to as to " upper sealing 66 " below.
At the upside of slot part 423, between the inner peripheral surface 422 of cap member 42 and the outer peripheral face 411 of axial region 41, form and have minim gap 663.Minim gap 663, between upper seal clearance 662 and motor 12 outsides, has suppressed to move at the lubricating oil of upper seal clearance 662 interior gasifications the situation of motor 12 outsides thus.
Between the inner peripheral surface 542a of the stop part 542 shown in Fig. 5 and the inclined plane 433 of urceolus portion 432, form and have width radially along with the lower seal gap 671 increasing downward and gradually.In lower seal gap 671, form and have the capillarity utilized to keep the lower seal portion 67 of lubricating oil 45.The liquid level of the downside of lubricating oil 45 is positioned at lower seal portion 67.In the time of CD-ROM drive motor 12, between the lower surface 522 of flange part 52 and the upper surface of convex edge portion 437 and between the lower surface of convex edge portion 437 and the upper surface of stop part 542, form gapped.Lower seal portion 67 is communicated with the outer rim of lower thrust clearance 652 by these gaps and anticreep gap 68.
As shown in Figure 6, in Bearning mechanism 4, from on sealing 66 arrive the region 6 of lower seal portion 67 via radial clearance 62, lower splaying 63, cylinder gap 64, lower thrust clearance 652 and anticreep gap 68 in and in communication gap 651 and intercommunicating pore 61, filled up continuously lubricating oil 45.
Fig. 8 is the cutaway view of sleeve part 5.In Fig. 8, also show the inner peripheral surface of sleeve part 5.Inner cylinder portion 51 comprises: be arranged to than the upper radial dynamic pressure groove row 711 of the top side of axial substantial middle of inner peripheral surface 511 and be arranged to than the axial substantial middle of the inner peripheral surface 511 lower radial dynamic pressure groove row 712 of side on the lower.Upper radial dynamic pressure groove row 711 be the groove of herringbone shape, along inner peripheral surface 511 circumferentially by multiple roughly V words towards laterally and the aggregate of the groove forming.In upper radial dynamic pressure groove row 711, the axial length at the position of upside is longer than the length at the position of downside.Below, the position of the upside of upper radial dynamic pressure groove row 711 is called " groove top 711a ", the position of downside is called to " groove bottom 711b ".Lower radial dynamic pressure groove row 712 are also the grooves of herringbone shape.In lower radial dynamic pressure groove row 712, the axial length of groove top 712a is shorter than the axial length of groove bottom 712b.
In the axial direction, the position of the lower thrust clearance 652 shown in Fig. 6 is than the top side of upper end position of the groove top 712a of lower radial dynamic pressure groove row 712.In radial clearance 62, in utilization, radial dynamic pressure groove row 711 and lower radial dynamic pressure groove row 712 form Journal Bearings in Hydrodynamic Lubrication portion 81, and this Journal Bearings in Hydrodynamic Lubrication portion 81 produces hydrodynamic radially for lubricating oil 45., the hydrodynamic bearing portion of the upside corresponding with upper radial dynamic pressure groove row 711 is called to " upper Journal Bearings in Hydrodynamic Lubrication portion 811 " below, the hydrodynamic bearing portion of the downside corresponding with lower radial dynamic pressure groove row 712 is called " lower Journal Bearings in Hydrodynamic Lubrication portion 812 ".Lower Journal Bearings in Hydrodynamic Lubrication portion 812 is overlapping with the fixed area 436 between the bottom of outer peripheral face and the support 211 of base plate 21 of urceolus portion 432 diametrically.
In addition, the position of lower thrust clearance 652 needs only than the top side of at least one dynamic pressure groove who forms lower radial dynamic pressure groove row 712, and also can be than the top side of whole dynamic pressure grooves of radial dynamic pressure groove row 712 under forming.These structures are included in the scope of execution mode.
Fig. 9 is the vertical view of lower thrust portion 43.Form and have spiral-shaped lower thrust dynamic pressure grooves row 722 at the upper surface 435 of urceolus portion 432.Lower thrust dynamic pressure grooves row 722 are located at circle 732 inner side, and this circle 732 is the circles centered by central axis J1, and circumscribed with the opening of the downside of intercommunicating pore 61.But when in the situation that opening is provided with chamfering, lower thrust dynamic pressure grooves row 722 are located at the inner side of the circle circumscribed with the position of the radial outside of chamfering.Shown in Fig. 9 in the situation that, lower thrust dynamic pressure grooves row 722 are set as than the opening of the downside of intercommunicating pore 61 by radially inner side.In the lower thrust clearance 652 shown in Fig. 6, form the thrust dynamic pressure bearing portion 822 as dynamic pressure generating section by lower thrust dynamic pressure grooves row 722, this thrust dynamic pressure bearing portion 822 produces the hydrodynamic of thrust direction for lubricating oil 45.
In motor 12, in lower thrust clearance 652, specific thrust hydrodynamic bearing portion 822 by the region of radial outside (below, be called " exterior lateral area 652a ") and upper sealing 66 and upper Journal Bearings in Hydrodynamic Lubrication portion 811 between region, via intercommunicating pore 61 and upper communication gap 651 and be communicated with.Intercommunicating pore 61 and upper communication gap 651 are referred to as to " access 69 " below.
In the time of CD-ROM drive motor 12, utilize Journal Bearings in Hydrodynamic Lubrication portion 81, the inner cylinder portion 51 of sleeve part 5 is supported in radial direction with respect to axial region 41.And, utilizing thrust dynamic pressure bearing portion 822, flange part 52 floats to the upside in Fig. 6 a little with respect to urceolus portion 432.As previously described, by the magnetic action of the magnetic back pressure mechanism 121 shown in Fig. 2, to the direction of floating of rotating part 3 be to attract rotating part 3 towards the direction of the opposite direction of upside in Fig. 2.In motor 12, utilize thrust dynamic pressure bearing portion 822 and magnetic back pressure mechanism 121, rotating part 3 is stably supported in thrust direction with respect to stationary part 2.
Now, in the upper radial dynamic pressure groove row 711 shown in Fig. 8 and lower radial dynamic pressure groove row 712, lubricating oil 45 is pumped and produces dynamic pressure in the central authorities of each dynamic pressure groove row.In Journal Bearings in Hydrodynamic Lubrication portion 81 entirety shown in Fig. 6, produce pressure upward for lubricating oil 45.
In the lower thrust dynamic pressure grooves row 722 shown in Fig. 9, produce the pressure towards the cylinder gap 64 shown in Fig. 6 for lubricating oil 45.In 64He Xia splaying, cylinder gap 63, form the higher state of pressure of lubricating oil 45, prevent separating out of bubble.
In Bearning mechanism 4, lubricating oil 45 is according to the sequential flowing of radial clearance 62, access 69, lower thrust clearance 652,64He Xia splaying, cylinder gap 63 and turn back to radial clearance 62.
Above the motor 12 of the 1st execution mode is illustrated, in motor 12, the position of the inner side of upper communication gap 651 is positioned at the upside of Journal Bearings in Hydrodynamic Lubrication portion 811, and the aperture efficiency thrust dynamic pressure bearing portion 822 of the downside of intercommunicating pore 61 is by radial outside.Therefore, from the lower end of sealing 66 arrive via access 69 on the path of upper end of lower seal portion 67, there is not hydrodynamic bearing portion, can easily suppress the generation of the pressure differential between sealing 66 and lower seal portion 67.
In the axial direction, the distance between the liquid level of upper sealing 66 and the liquid level of lower seal portion 67, shorter than the axial length of Journal Bearings in Hydrodynamic Lubrication portion 81.Result is the pressure differential that can further reduce between upper-lower seal portion 66,67.The axial length of Journal Bearings in Hydrodynamic Lubrication portion 81 represents that the upper end of the groove top 711a from upper radial dynamic pressure groove row 711 is till the length of the lower end of the groove bottom 712b in lower radial dynamic pressure groove row 712.
Bottom as the cylinder gap 64 in the 2nd gap is communicated with the bottom of the radial clearance 62 as the 1st gap, and as the lower thrust clearance 652 in the 3rd gap than lower Journal Bearings in Hydrodynamic Lubrication portion 812 top sides.Therefore, can guarantee the length of radial clearance 62, and lower thrust clearance 652 and the upper communication gap 651 as the 4th gap are approached, can easily shorten the length of the intercommunicating pore 61 that upper communication gap 651 and lower thrust clearance 652 are communicated with.Result can suppress the amount of the lubricating oil 45 in intercommunicating pore 61, can reduce flow path resistance simultaneously.And, can make sealing 66 and lower seal portion 67 approach.Due to intercommunicating pore 61 and central axis J1 almost parallel, and the length of intercommunicating pore 61 is axially shorter, thereby can easily form intercommunicating pore 61.In addition, in order further to suppress the amount of lubricating oil 45, also can make the variation in diameter of intercommunicating pore 61 to the width degree in cylinder gap 46.
Upper sealing 66 comprises pumping sealing, thus can suppress lubricating oil 45 from radial clearance 62 towards sealing 66.Result is that lubricating oil 45 successfully flows to communication gap 651 from the upper end of radial clearance 62, can make lubricating oil 45 efficient circulation.In Bearning mechanism 4, stop part 542 also plays a role as the parts of rotating part 3 sides that form lower seal portion 67, thereby can simplify the structure of Bearning mechanism 4.
In motor 12, seal clearance 662 on formation around axial region 41 has, thereby can reduce the area of the liquid level of the lubricating oil 45 in upper sealing 66, can suppress the evaporation of lubricating oil 45 from upper sealing 66.Result is that the lubricating oil that can suppress gasification is diffused in the inner space of disk drive device 1 from upper sealing 66, can improve the reliability of disk drive device 1.
Radial outside is leaned on than upper seal clearance 662 in lower seal gap 671, and lower seal gap 671 length is in the axial direction longer, thereby can in lower seal gap 671, guarantee enough lubricating oil 45.In addition, the liquid level of the lubricating oil 45 in lower seal portion 67 is positioned at motor 12 inside, even thereby increase the area of liquid level, the lubricating oil 45 that also can suppress gasification spreads in the inner space of disk drive device 1.
Radial outside leans on than upper sealing 66 in lower seal portion 67, and does not exist for lubricating oil 45 and produce the dynamic pressure generating section towards the pressure of radially inner side between upper-lower seal portion 66,67, thereby in the time of CD-ROM drive motor 12, lubricating oil 45 is partial in lower seal portion 67.In upper sealing 66, the position of the liquid level of lubricating oil 45 declines, and can reduce the area of liquid level.Result is further to suppress the evaporation of lubricating oil 45 from upper sealing 66.
Lower thrust clearance 652 is located at the top of Bearning mechanism 4, thereby can in the space of the downside of lower thrust clearance 652, configure the fixed area 436 between urceolus portion 432 and base plate 21.Therefore, can fully obtain the axial length of fixed area 436.In motor 12, the axial length of Journal Bearings in Hydrodynamic Lubrication portion 81 is longer, thereby for the external force that acts on the direction that rotating part 3 tilts, can improve the rigidity of Bearning mechanism 4.The surrounding of lower Journal Bearings in Hydrodynamic Lubrication portion 812 is surrounded by base plate 21, thereby the rigidity of the surrounding of the bottom of Journal Bearings in Hydrodynamic Lubrication portion 81 is improved.Like this, by utilizing the Bearning mechanism 4 of fixed shaft type, can easily realize the motor 12 of high rigidity.Result is for can make motor 12 rotate under low vibrational state.And axial existence range and the base plate 21 of lower Journal Bearings in Hydrodynamic Lubrication portion 812 are overlapping, therefore can make the thickness attenuation of motor 12 entirety in central axis J1 direction.
4 of Bearning mechanisms have a thrust dynamic pressure bearing portion, thereby do not need to adjust accurately the distance between the lower surface of cap member and the upper surface of flange part, need on these faces, dynamic pressure groove be set.Result is with compared with the motor up and down with thrust dynamic pressure bearing portion of flange part, can manufacture Bearning mechanism 4 by qurer.
In motor 12, as shown in the upward view of the inner cylinder portion 51 of Figure 10, also can form thrust dynamic pressure grooves row 723 at the lower surface of inner cylinder portion 51.Thus, the lower splaying 63 in Fig. 6 is formed in the thrust dynamic pressure bearing portion of thrust direction support inner cylinder portion 51.In this case, in lower thrust clearance 652, also there is the situation that can not form the dynamic pressure generating section playing a role as thrust dynamic pressure bearing portion.But, preferably in lower thrust clearance, configuring dynamic pressure groove row, this dynamic pressure groove is classified as for lubricating oil 45 and is produced the dynamic pressure generating section towards the degree of the pressure of radially inner side.In the case of the structure shown in Figure 10, in the axial direction, preferably descend the width of thrust clearance to be greater than the width of lower splaying.This is equally applicable to other execution mode below.
Figure 11 is the cutaway view that represents a part for the motor of another example.The flange part 52 of motor 12 comprise from lower surface 522 upward and to radially inner side tilt intercommunicating pore 61a.The opening of the upside of intercommunicating pore 61a is connected with upper communication gap 651.The opening of the downside of intercommunicating pore 61a is connected by the exterior lateral area 652a of radial outside with the specific thrust hydrodynamic bearing portion 822 of lower thrust clearance 652.In the time of CD-ROM drive motor 12, the lubricating oil 45 in intercommunicating pore 61a flows to radial outside downward.Because intercommunicating pore 61a tilts to radial outside downward, thereby can lubricating oil 45 be flowed efficiently by the centrifugal force that results from lubricating oil 45 in intercommunicating pore 61a.The opening of the upside of intercommunicating pore 61a is positioned at the radially inner side of the lower surface 421 of cap member 42, thereby can reduce the width radially of upper communication gap 651.Result is the amount that can cut down lubricating oil 45.And, can also reduce the width radially of cap member 42.
Figure 12 is the cutaway view that represents a part of the motor 12a of the 2nd execution mode.The sleeve part 5 of motor 12a is included in the upside of inner core portion 51 to the upper annulus 47a of radial outside expansion.Upper annulus 47a comprises intercommunicating pore 471 and slot part 472.Intercommunicating pore 471 is along with tilting to radially inner side upward.Intercommunicating pore 471 is access that the lower surface of upper annulus 47a 473 and inner peripheral surface 474 are communicated with.Slot part 472 is positioned on inner peripheral surface 474, and is positioned at than the position of the top side of opening of the upside of intercommunicating pore 471.Slot part 472 is the ring-types centered by central axis J1.Other structure of motor 12a is identical with the motor 12 of the 1st execution mode.Below identical structure mark same numeral is described.
Between the bottom and axial region 41 of slot part 472, form the width having radially along with the upper seal clearance 662 reducing downward and gradually.In upper seal clearance 662, form and have the capillarity utilized to keep the labyrinth sealing portion of lubricating oil 45.Form and have the dynamic pressure groove identical with Fig. 4 424 in the position of side on the lower at the ratio slot part 472 of inner peripheral surface 474.In the time of CD-ROM drive motor 12, utilize dynamic pressure groove 424 to form the pumping sealing that produces pressure downward for lubricating oil 45.In motor 12a, utilize labyrinth sealing portion and pumping sealing to form upper sealing 66, the position of the liquid level of the upside of lubricating oil 45 is maintained constant.
In motor 12, the region of intercommunicating pore 471 between the same sealing 66 of opening part of upside and upper Journal Bearings in Hydrodynamic Lubrication portion 811 is connected.Intercommunicating pore 471 is connected with the exterior lateral area 652a of lower thrust dynamic pressure bearing portion 822 at the opening part of downside.In the 2nd execution mode, from the lower end of sealing 66 arrive via intercommunicating pore 471 on the path of upper end of lower seal portion 67 and also do not have hydrodynamic bearing portion, can easily suppress the generation of the pressure differential between sealing 66 and lower seal portion 67.
Intercommunicating pore 471 is roughly communicated with the lower surface of upper annulus 47a 473 and inner peripheral surface 474 linearity, can shorten thus the path that connects upper sealing 66 and lower seal portion 67.Result is to suppress to be filled in the amount of the lubricating oil 45 in Bearning mechanism 4.
Identical with the 1st execution mode, sealing 66 on formation around axial region 41 has, thereby can reduce the area of the liquid level of the lubricating oil 45 in upper sealing 66, can suppress the evaporation of lubricating oil 45 from upper sealing 66.This is equally applicable to execution mode below.
Figure 13 is the cutaway view that represents a part for the motor of the 3rd execution mode.The inner peripheral surface 425 of the cap member 42 of motor 12 is along with tilting to radial outside upward.Between inner peripheral surface 425 and the outer peripheral face 411 of axial region 41, form the width having radially along with the gap 664 reducing downward and gradually.In gap 664, form and have the capillarity utilized to keep the labyrinth sealing portion of lubricating oil 45 to go up sealing 66a.Gap 664 is called to " upper seal clearance 664 " below.In addition, in motor 12, preferably do not produce the pressure towards above-below direction for lubricating oil 45 in Journal Bearings in Hydrodynamic Lubrication portion 81.Other structure of motor 12 is identical with the motor 12 of the 1st execution mode.
In Bearning mechanism 4, the minimum diameter Rs of the inner peripheral surface 425 of cap member 42 is the internal diameter of the bottom of inner peripheral surface 425, is greater than the minimum diameter Rj of the inner peripheral surface 523 of flange part 52.In other words, the minimum diameter of the upper annulus 47 in upper sealing 66a is greater than the minimum diameter of the upper annulus 47 in Journal Bearings in Hydrodynamic Lubrication portion 81.Thus, can guarantee the size of upper seal clearance 664, can be at the enough lubricating oil 45 of the interior maintenance of upper seal clearance 664.
In the 3rd execution mode, also the same with the 1st execution mode, can easily suppress the generation of the pressure differential between sealing 66a and lower seal portion 67.In motor 12, compared with the situation that has pumping sealing with formation, can easily form upper sealing 66a.For the motor on the top of axial region with screwed hole, if will, at the outer peripheral face setting of axial region seal clearance upward and on the inclined plane of radially inner side forms, cause axial region excessively thin.On the other hand, in motor 12, be inclined plane by the inner peripheral surface 425 that makes cap member 42, can form upper seal clearance 664 and without by the top attenuation of axial region 41.
Above embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned execution mode, can carries out various changes.
In the 1st and the 2nd execution mode, also can form dynamic pressure groove on the top of the outer peripheral face of axial region 41 411, thus at the interior formation pumping in upper axial clearance 661 sealing.Also can only form upper sealing with pumping sealing.
In the above-described embodiment, as long as fully guaranteed the thickness at the position between the outer peripheral face 411 of axial region 41 and the inner peripheral surface of screwed hole 412, also can arrange towards radially inner side and inclined plane upward at outer peripheral face 411, form thus upper seal clearance.As long as fully stop sleeve portion 5, also can only form Journal Bearings in Hydrodynamic Lubrication portion 81 at a place.Also can form Journal Bearings in Hydrodynamic Lubrication portion in radial clearance 62 entirety.Like this, in motor, as long as form Journal Bearings in Hydrodynamic Lubrication portion at least a portion of radial clearance 62.In lower thrust clearance 652, as long as form thrust dynamic pressure bearing portion at least a portion.
In the upper radial dynamic pressure groove row 711 shown in Fig. 8, the multiple tippers that tilt along groove top 711a also can be set between the 711a of groove top.And, also can make the groove depth of groove top 711a darker than groove bottom 712b.Thus, can increase pressure downward to lubricating oil 45.The length of groove top 711a also can with the same length of groove bottom 712b.This is equally applicable to lower radial dynamic pressure groove row 712.In lower radial dynamic pressure groove row 712, also can between the 712b of groove bottom, tipper be set, also can make groove depth darker than groove top 712a.The slot length of dynamic pressure groove, groove depth, well width etc. can carry out various distortion in the scope that does not depart from invention scope.And, also can radial dynamic pressure groove row be set at the outer peripheral face of axial region 41 411.
Lower thrust dynamic pressure grooves row 722 can be also herringbone shapes.In this case, in lower thrust dynamic pressure grooves, by making the length at position of Length Ratio radially inner side at position of radial outside long, lubricating oil 45 is produced to the pressure towards radially inner side.In addition, multiple tippers also can be set between the position of the radial outside of thrust dynamic pressure grooves.Can also make the groove depth at position of the radial outside of thrust dynamic pressure grooves darker than the position of inner side.In lower thrust clearance 652, in the case of can ignoring the impact of the pressure for the lubricating oil 45 in intercommunicating pore 61 being formed by thrust dynamic pressure bearing portion 822, a part for the opening of the downside of the intercommunicating pore 61 shown in Fig. 9 also can be overlapping with lower thrust dynamic pressure grooves row 722.Lower thrust dynamic pressure grooves row also can be located at the lower surface 52 of flange part 52.
In the 1st execution mode, in the Bearning mechanism 4 shown in Fig. 6, the loop direction of lubricating oil 45 can be also the counter clockwise direction in Fig. 6.That is, lubricating oil 45 also can according to from radial clearance 62 via the sequential flowing of splaying 63, cylinder gap 64, lower thrust clearance 652, intercommunicating pore 61 and upper communication gap 651, and turn back to radial clearance 62.This is equally applicable to the 2nd and the 3rd execution mode.
Lower thrust portion 43 also can utilize the parts that are connected with base plate 21 to form.Thus, can cut down part count.Lower board unit 431 and urceolus portion 432 can be also the parts of split.Lower thrust portion 43 also can utilize the parts that are connected with axial region 41 to form.
In the above-described embodiment, as long as fully produce the magnetic action that attracts rotating part 3, also can only form magnetic back pressure mechanism with rotor magnet 32 and stator 22.Also can only form magnetic back pressure mechanism with rotor magnet 32 and magnetic part 23.Can also be arranged in addition another magnetic part that produces magnetic action between the magnetic part 23 of stationary part 2 at rotating part 3.
The structure of above-mentioned execution mode and each variation only otherwise conflicting, can be carried out appropriately combined.
The motor that the present invention can use as disk drive device, also can be as the motor of the device except disk drive device.
Claims (10)
1. a motor, is characterized in that, this motor possesses:
Stationary part, it has stator; And
Rotating part, it has rotor magnet, and is supported to and can rotate by described stationary part,
Described stationary part comprises:
Axial region, it is configured centered by the central axis towards above-below direction;
Lower board unit, its bottom from described axial region is expanded to radial outside; And
Urceolus portion, extend upward its outer edge from described lower board unit,
Described rotating part comprises:
Inner cylinder portion, between its outer peripheral face at described axial region and the inner peripheral surface of described urceolus portion;
Upper annulus, its upside in described inner cylinder portion is expanded to radial outside, and on this, the described outer peripheral face of the inner peripheral surface of annulus and described axial region is opposite, and on this, the upper surface of the lower surface of annulus and described urceolus portion is opposite; And
Lower hub annulus, its radial outside in described urceolus portion is expanded downwards the outer edge of annulus from described,
The described outer peripheral face of described axial region and described on form between the top of described inner peripheral surface of annulus have on sealing, the liquid level of the upside of lubricating oil is positioned at sealing on this,
The downside of sealing on described, the described outer peripheral face of described axial region and described between described outer peripheral face and the inner peripheral surface of described inner cylinder portion between the described inner peripheral surface of annulus and at described axial region, form and have from described sealing continuous the 1st gap downwards
Between the outer peripheral face of described inner cylinder portion and the described inner peripheral surface of described urceolus portion, form and have the 2nd gap being communicated with the lower end in described the 1st gap,
On described between the described lower surface of annulus and the described upper surface of described urceolus portion, form and have the 3rd gap to radial outside expansion from the upper end in described the 2nd gap,
Between the outer peripheral face and described lower hub annulus of described urceolus portion, form and have lower seal portion, this lower seal portion is communicated with the outer rim in described the 3rd gap, and the liquid level of the downside of described lubricating oil is positioned at this lower seal portion,
Form and have Journal Bearings in Hydrodynamic Lubrication portion at least a portion in described the 1st gap, form and have thrust dynamic pressure bearing portion at least a portion in described the 3rd gap,
Between described rotating part and described stationary part, produce magnetic action, this magnetic action is to making the direction of floating opposite direction that described rotating part floats attract described rotating part with described thrust dynamic pressure bearing portion,
Described upper annulus has access, and this access is for being got up by the regional connectivity of radial outside with thrust dynamic pressure bearing portion described in the ratio in described the 3rd gap in the region between described upper sealing and described Journal Bearings in Hydrodynamic Lubrication portion,
From described, sealing arrives region and the described access of described lower seal portion via described the 1st gap, described the 2nd gap and described the 3rd gap, is filled up by described lubricating oil.
2. motor according to claim 1, wherein,
Described upper annulus comprises:
The cap member of ring-type, forms described upper sealing therein between the described outer peripheral face of side face and described axial region; And
Flange part, it is from outstanding to radial outside between described cap member and described inner cylinder portion, between the lower surface of this flange part and the described upper surface of described urceolus portion, forms described the 3rd gap.
3. motor according to claim 2, wherein,
Described access comprises:
Intercommunicating pore, its described lower surface from described flange part connects described flange part towards upper surface; And
The 4th gap, it is between the described upper surface and the lower surface of described cap member of described flange part.
4. motor according to claim 1, wherein,
Described access is intercommunicating pore, this intercommunicating pore is along with tilting to radially inner side upward, and by the region between described upper sealing and described Journal Bearings in Hydrodynamic Lubrication portion, with thrust dynamic pressure bearing portion described in the ratio in described the 3rd gap by the region linearity of radial outside be communicated with.
5. motor according to claim 1, wherein,
The described outer peripheral face of described axial region and described between the described top of described inner peripheral surface of annulus, form the width having radially along with the upper seal clearance reducing downward and gradually.
6. motor according to claim 1, wherein,
Sealing forms on described the dynamic pressure generating section that described lubricating oil is produced to pressure downward.
7. motor according to claim 1, wherein,
Described lower hub annulus comprises:
Lower hub cylinder portion, it expands downwards described outer edge of annulus from described, and has apart from the distance of central axis and become large stage portion; And
Stop part, it contacts with the lower surface of described stage portion, and is fixed in the inner peripheral surface of described lower hub cylinder portion, the upper surface of this stop part and described on form anticreep gap between the described lower surface of annulus.
8. motor according to claim 7, wherein,
The top of described urceolus portion comprises convex edge portion, and this convex edge portion expands to radial outside, and the end of described convex edge portion is positioned at described anticreep gap,
Between the inner peripheral surface of described stop part and the outer peripheral face of described urceolus portion, form and have described lower seal portion.
9. motor according to claim 1, wherein,
Described stationary part also comprises the magnetic part of the below that is positioned at described rotor magnet,
In the axial direction, the magnetic center of described stator than the magnetic center of described rotor magnet on the lower,
Described magnetic action results between described rotor magnet and described magnetic part and between described stator and described rotor magnet.
10. a disk drive device, is characterized in that, this disk drive device has:
Make the motor described in any one in the claim 1～9 of disc spins;
Access portion, its described dish is carried out to reading of information and write at least one party; And
Casing, it holds described dish, described motor and described access portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011129998A JP2012257428A (en) | 2011-06-10 | 2011-06-10 | Motor and disk drive |
| JP2011-129998 | 2011-06-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102820727A CN102820727A (en) | 2012-12-12 |
| CN102820727B true CN102820727B (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210021666.6A Expired - Fee Related CN102820727B (en) | 2011-06-10 | 2012-01-31 | Motor and disk drive device |
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| Country | Link |
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| JP (1) | JP2012257428A (en) |
| CN (1) | CN102820727B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5233854B2 (en) | 2009-06-12 | 2013-07-10 | 日本電産株式会社 | Bearing device, spindle motor, and disk drive device |
| US8687317B1 (en) | 2012-09-25 | 2014-04-01 | Nidec Corporation | Spindle motor and disk drive apparatus |
| US8941946B2 (en) | 2013-03-14 | 2015-01-27 | Nidec Corporation | Motor including dynamic bearing with seal portion and disk drive apparatus including the same |
| US9001460B2 (en) | 2013-08-21 | 2015-04-07 | Nidec Corporation | Spindle motor, and disk drive apparatus |
| CN106763148B (en) * | 2017-03-28 | 2023-03-14 | 京信通信技术(广州)有限公司 | Antenna |
| CN107100932B (en) * | 2017-06-12 | 2023-01-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Axial magnetic suspension bearing, magnetic suspension system and compressor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6412984B2 (en) * | 1998-05-14 | 2002-07-02 | Nsk Ltd. | Dynamic pressure bearing apparatus |
| JP2005045924A (en) * | 2003-07-22 | 2005-02-17 | Nippon Densan Corp | Spindle motor, method of manufacturing rotor applied to the spindle motor, and hard disc drive equipped with the spindle motor |
| CN201038902Y (en) * | 2007-01-19 | 2008-03-19 | 建凖电机工业股份有限公司 | Dial structure of principal motor with pneumatic pressure bearing |
| CN101212160A (en) * | 2006-12-27 | 2008-07-02 | 日本电产株式会社 | Spindle motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08221896A (en) * | 1995-02-15 | 1996-08-30 | Koyo Seiko Co Ltd | Spindle unit |
-
2011
- 2011-06-10 JP JP2011129998A patent/JP2012257428A/en not_active Withdrawn
-
2012
- 2012-01-31 CN CN201210021666.6A patent/CN102820727B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6412984B2 (en) * | 1998-05-14 | 2002-07-02 | Nsk Ltd. | Dynamic pressure bearing apparatus |
| JP2005045924A (en) * | 2003-07-22 | 2005-02-17 | Nippon Densan Corp | Spindle motor, method of manufacturing rotor applied to the spindle motor, and hard disc drive equipped with the spindle motor |
| CN101212160A (en) * | 2006-12-27 | 2008-07-02 | 日本电产株式会社 | Spindle motor |
| CN201038902Y (en) * | 2007-01-19 | 2008-03-19 | 建凖电机工业股份有限公司 | Dial structure of principal motor with pneumatic pressure bearing |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平08221896A 1996.08.30 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102820727A (en) | 2012-12-12 |
| JP2012257428A (en) | 2012-12-27 |
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