CN103973021A - Spindle Motor And Drive Apparatus - Google Patents
Spindle Motor And Drive Apparatus Download PDFInfo
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- CN103973021A CN103973021A CN201410019329.2A CN201410019329A CN103973021A CN 103973021 A CN103973021 A CN 103973021A CN 201410019329 A CN201410019329 A CN 201410019329A CN 103973021 A CN103973021 A CN 103973021A
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Abstract
A lubricating oil is arranged between stationary and rotating portions of a spindle motor. When the motor is stationary, upper and lower surfaces of the lubricating oil are respectively located in upper and lower capillary seal portions. A first angle defined between an outer circumferential surface of the plate portion and an inner circumferential surface of a cylindrical portion at the upper capillary seal portion, and a second angle defined between an outer circumferential surface of a sleeve and an inner circumferential surface of the wall portion at the lower capillary seal portion, in a section taken along a plane including a central axis is respectively in the range of about 1 degree to about 8 degrees and in the range of about 1 degree to about 10 degrees, respectively.; The upper capillary seal portion has maximum radial and axial dimensions smaller than those of the lower capillary seal portion.
Description
Technical field
The present invention relates to a kind of Spindle Motor and disc drive appts.
Background technology
In hard disk unit or optical disc apparatus, be equipped with the Spindle Motor for disc is rotated centered by its central axis.Spindle Motor comprises stationary part and the supports disc of the casing that is fixed on device and makes the rotating part of disc rotation.Spindle Motor produces the torque centered by central axis by the magnetic flux producing between stationary part and rotating part, makes thus rotating part rotate with respect to stationary part.
The stationary part of Spindle Motor is connected by bearing arrangement with rotating part.Particularly Spindle Motor is in recent years used the bearing arrangement of filling lubricating oil between stationary part and rotating part.About thering is the bearing arrangement of lubricating oil, for example, in No. 2010/0321823 specification of U.S. Patent Application Publication, recorded a kind of bearing arrangement that is filled with lubricating oil between axle freely of relative rotation and rotating parts that is being supported to.
Summary of the invention
As United States Patent (USP) discloses the bearing arrangement of recording in No. 2010/0321823 specification, in thering is the bearing arrangement of lubricating oil, there is the bearing arrangement that comprises liquid level and lower liquid level two place's liquid levels.
In this bearing arrangement, when filling lubricating oil, preferably measure the injection rate that both height of upper liquid level and lower liquid level is managed lubricating oil.But structurally, the height of sometimes measuring one of them liquid level is more difficult.For example, in the bearing arrangement of recording in No. 2010/0321823 specification of U.S. Patent Application Publication, because the outer peripheral face of the sleeve part of the inner peripheral surface by axial cup and wheel hub forms the capillary seal portion of downside, therefore when injecting lubricating oil, the lower liquid level in can not the capillary seal portion of visual downside.That is, can not measure the height of lower liquid level.Therefore, need an injection rate of managing lubricating oil according to the height of upper liquid level.
And, Spindle Motor slimming all the more in recent years.Meanwhile require axially and radially dwindling capillary seal portion.For example, if make the bearing arrangement slimming recorded in No. 2010/0321823 specification of U.S. Patent Application Publication, capillary seal portion need to axially and radially dwindled.Thus, the part more than needed of change of liquid level that can allow the lubricating oil at capillary seal portion place diminishes.Therefore, there is the impact being subject to from outside due to the change of the liquid level of lubricating oil when Spindle Motor rotates or when Spindle Motor static, and cause lubricating oil to escape to the outside danger of Spindle Motor.
The object of this invention is to provide and a kind ofly can suppress the Spindle Motor that lubricating oil spills from capillary seal portion.
In the Spindle Motor of the 1st exemplary invention of the present invention, comprise stationary part and rotating part.Stationary part comprises along the axle of the central axis configuration of upper downward-extension.Rotating part is supported to and can centered by central axis, rotates in the surrounding of axle.Stationary part comprises axle, plectane portion, wall portion and board.Plectane portion extends towards radial outside from axle.Wall portion is extend upward from the outer rim of plectane portion roughly cylindric.Board is and above plectane portion, surrounds the roughly circular of axle.Rotating part comprises annulus portion, cylindrical portion and sleeve.It is roughly circular that annulus portion is.Cylindrical portion is extended upward from the outer rim of annulus portion.Sleeve comprises the intercommunicating pore that connects vertically annulus portion.The outer peripheral face of board is across upper capillary seal portion and opposed with the inner peripheral surface of cylindrical portion.The interval radially of upper capillary seal portion is along with downward dwindling.The outer peripheral face of sleeve is across lower capillary seal portion and opposed with the inner peripheral surface of described wall portion.The interval radially of lower capillary seal portion is along with downward dwindling.Between stationary part and rotating part, on comprising, in the space of capillary seal portion, the 1st gap, the 2nd gap, the 3rd gap, intercommunicating pore and lower capillary seal portion, have lubricating oil.The 1st gap is between the lower surface of board and the upper surface of sleeve.The 2nd gap is between the outer peripheral face of axle and the inner peripheral surface of sleeve.The 3rd gap is between the lower surface of sleeve and the upper surface of plectane portion.Intercommunicating pore is axially being communicated with the 1st gap and the 3rd gap.When static, the upper liquid level of lubricating oil is positioned at capillary seal portion.When static, the lower liquid level of lubricating oil is positioned at lower capillary seal portion.By in the cross section of central axis, at upper capillary seal portion's place's outer peripheral face of board and formed the 1st angle of the inner peripheral surface of cylindrical portion, be 1 degree or be greater than 1 degree and be less than 8 degree or the angle of 8 degree.By in the cross section of central axis, at lower capillary seal portion's place's outer peripheral face of sleeve and formed the 2nd angle of the inner peripheral surface of wall portion, be 1 degree or be greater than 1 degree and be less than 10 degree or the angle of 10 degree.The Breadth Maximum radially of upper capillary seal portion is less than the Breadth Maximum radially of lower capillary seal portion.The axial length of upper capillary seal portion is less than the axial length of lower capillary seal portion.
In the disc drive appts of the 2nd exemplary invention of the present invention, have of the present invention exemplary the 1st invention that comprises basal part Spindle Motor, to by the disc of the described rotating part supporting of described Spindle Motor, carried out reading of information and write in access portion and the outer cover of at least one, described rotating part and described access portion are contained in the inside of the housing consisting of described basal part and described outer cover.
According to the 1st exemplary invention of the present invention, can suppress lubricating oil and spill from capillary seal portion.
According to the 2nd exemplary invention of the present invention, can suppress lubricating oil and spill from capillary seal portion.
By the detailed description of the following preferred embodiment for the present invention, with reference to accompanying drawing, can more clearly understand above-mentioned and other feature of the present invention, key element, step, feature and advantage.
Accompanying drawing explanation
Fig. 1 is the partial, longitudinal cross-sectional of the related Spindle Motor of the 1st execution mode.
Fig. 2 is the longitudinal section of the related disc drive appts of the 2nd execution mode.
Fig. 3 is the longitudinal section of the related Spindle Motor of the 2nd execution mode.
Fig. 4 is the partial, longitudinal cross-sectional of the related Spindle Motor of the 2nd execution mode.
Fig. 5 is the partial, longitudinal cross-sectional of the related Spindle Motor of the variation of the 2nd execution mode.
Fig. 6 is the partial, longitudinal cross-sectional of the related Spindle Motor of the variation of the 1st execution mode.
Embodiment
Referring to accompanying drawing, exemplary execution mode of the present invention is described.In addition, in this application, respectively the parallel direction of the central axis with Spindle Motor is called to " axially ", the direction of the central axis quadrature with Spindle Motor is called to " radially ", the direction of the circular arc along centered by the central axis of Spindle Motor is called to " circumferentially ".And, in this application, using axially as above-below direction, with respect to basal part, take stator unit side as upper, shape and the position relationship of each several part is described.But, the direction when definition of this above-below direction does not limit the use of Spindle Motor involved in the present invention and disc drive appts.
And in this application, " parallel direction " also comprises the direction of almost parallel.And in this application, " direction of quadrature " also comprises the roughly direction of quadrature.
Fig. 1 is the partial sectional view of the related Spindle Motor 11A of the 1st execution mode.
As shown in Figure 1, Spindle Motor 11A comprises stationary part 2A and rotating part 3A.
Stationary part 2A comprises axle 21A, the 231A of plectane portion, the 232A of wall portion and board 24A.Axle 21A is along the central axis 9A configuration of upper downward-extension.The 231A of plectane portion extends to radial outside from axle 21A.The 232A of wall portion is roughly cylindric extension from the outer rim of the 231A of plectane portion towards top.Flat part 24A surrounds axle 21A above the 231A of plectane portion.And it is roughly circular that flat part 24A is.
Rotating part 3A is supported to and can centered by central axis 9A, rotates in the surrounding of axle 21A.Rotating part 3A comprises sleeve 31A.Sleeve 31A comprises the 311A of annulus portion, cylindrical portion 312A and intercommunicating pore 314A.The 311A of annulus portion is roughly circular.Cylindrical portion 312A extends to upside from the outer rim of the 311A of annulus portion.Intercommunicating pore 314A connects the 311A of annulus portion vertically.
The outer peripheral face of board 24A is across the upper capillary seal 51A of portion and opposed with the inner peripheral surface of cylindrical portion 312A.The inner peripheral surface by the outer peripheral face of board 24A and the cylindrical portion 312A of sleeve 31A forms the upper capillary seal 51A of portion.The interval radially of the upper capillary seal 51A of portion is along with downward dwindling.
The outer peripheral face of sleeve 31A is across the lower capillary seal 52A of portion and opposed with the inner peripheral surface of the 232A of wall portion.By the outer peripheral face of sleeve 31A and the inner peripheral surface of the 232A of wall portion, form the lower capillary seal 52A of portion.The interval radially of the lower capillary seal 52A of portion is along with downward dwindling.
As shown in Figure 1, by the lower surface of board 24A and the upper surface of sleeve 31A, form the 1st gap 53A.By the outer peripheral face of axle 21A and the inner peripheral surface of sleeve 31A, form the 2nd gap 54A.By the lower surface of sleeve 31A and the upper surface of the 231A of plectane portion, form the 3rd gap 55A.The 1st gap 53A is communicated with axial by intercommunicating pore 314A with the 3rd gap 55A.
The lubricated oily 40A in small gap between axle 21A, the 231A of plectane portion, the 232A of wall portion and board 24A and sleeve 31A fills up.Between stationary part 2A and rotating part 3A, on comprising, in the space of the 51A of capillary seal portion, the 1st gap 53A, the 2nd gap 54A, the 3rd gap 55A, intercommunicating pore 314A and the lower capillary seal 52A of portion, have lubricating oil 40A.When static, the upper liquid level 401A of lubricating oil 40A is positioned at the 51A of capillary seal portion.And when static, the lower liquid level 402A of lubricating oil 40A is positioned at the lower capillary seal 52A of portion.
As shown in Figure 1, in passing through the cross section of central axis 9A, the angle at the outer peripheral face of the upper capillary seal 51A of the portion board 24A of place and the formed angle of inner peripheral surface of cylindrical portion 312A is the 1st angle θ 1A.Equally, in passing through the cross section of central axis 9A, the angle at the outer peripheral face of the lower capillary seal 52A of the portion sleeve 31A of place and the formed angle of inner peripheral surface of the 232A of wall portion is the 2nd angle θ 2A.The 1st angle θ 1A is 1 degree or is greater than 1 degree and is less than 8 degree or the angle of 8 degree.And the 2nd angle θ 2A is 1 degree or is greater than 1 degree and is less than 10 degree or the angle of 10 degree.
Thus, the change of the height of the upper liquid level 401A in the upper capillary seal 51A of portion and the height of the lower liquid level 402A in the lower capillary seal 52A of portion diminishes.Therefore,, even when axially making Spindle Motor 1A slimming, also can guarantee upper end from upper liquid level 401A to the upper capillary seal 51A of portion and the rich part of the upper end from lower liquid level 402A to the lower capillary seal 52A of portion.Can suppress thus due to the change of the liquid level of the lubricating oil when Spindle Motor 11A rotates or impact that Spindle Motor 11A is subject to from outside when static cause lubricating oil 40 from the 51A of capillary seal portion and the lower capillary seal 52A of portion spill.
Especially in this Spindle Motor 11A, the Breadth Maximum radially of the upper capillary seal 51A of portion is less than the Breadth Maximum radially of the lower capillary seal 52A of portion.And the axial length of the 52A of capillary seal portion is little under the axial Length Ratio of the upper capillary seal 51A of portion.
Thus, the variation of the liquid level of the lower liquid level 402A in the lower capillary seal 52A of portion is less than the variation of the liquid level of the upper liquid level 401A in the upper capillary seal 51A of portion.Thus, the rich part in the lower capillary seal 52A of portion becomes larger.And when injecting lubricating oil 40A, the height of the upper liquid level 401A in the upper capillary seal 51A of portion can be by confirmations such as visual or measurements.Therefore,, even if only manage the height of the upper liquid level 401A in the upper capillary seal 51A of portion, also can suppress lubricating oil 40A and spill from the lower capillary seal 52A of portion.
Fig. 2 is the longitudinal section of the related disc drive appts 1 of the 2nd execution mode.Disc drive appts 1 is to make disk sheet 14(hereinafter to be referred as making " disc 14 ") rotate, and disc 14 is carried out to the device that reads and write of information.As shown in Figure 2, disc drive appts 1 comprises Spindle Motor 11, apparatus housing 12,13,2 discs 14 of outer cover and access portion 15.
Spindle Motor 11 supports disc 14 also rotate disc 14 centered by central axis 9.Spindle Motor 11 comprises rotating part 3 and has the stationary part 2 of basal part 22.Basal part 22 is a part for apparatus housing 12, and the parts that are connected as a single entity by other the position with apparatus housing 12 form.
The opening on the top of outer cover 13 cladding system casings 12.
3,2 discs 14 of rotating part of Spindle Motor 11 and access portion 15 are contained in by comprising the apparatus housing 12 of basal part 22 and the inside of the housing that outer cover 13 forms.
Disc 14 is by rotating part 3 supportings of Spindle Motor 11.Disc 14 when Spindle Motor 11 drives and rotating part 3 together rotate.
Access portion 15 makes head member 151 move along the recording surface of disc 14, and disc 14 is carried out to reading and writing of information.In addition, access portion 15 also can carry out any one in reading and writing of information to 14 of discs.
In addition, disc drive appts 1 also can comprise 1 or 3 above discs 14.
Below continue the structure of above-described Spindle Motor 11 to describe.Fig. 3 is the longitudinal section of Spindle Motor 11.Fig. 4 is the partial, longitudinal cross-sectional of Spindle Motor 11.As shown in Figure 3, Spindle Motor 11 comprises with respect to the apparatus housing 12 of disc drive appts 1 relative to static stationary part 2 and supports disc 14 and the rotating part 3 that rotates centered by central axis 9.
Stationary part 2 comprises axle 21, basal part 22, cup portion 23, board 24 and stator unit 25.
Axle 21 is substantial cylindrical shape, and configures along the central axis 9 of upper downward-extension.Board 24 is fixed near the upper end of axle 21.And cup portion 23 is configured near the bottom of axle 21.Axle 21 is such as being formed by metals such as stainless steels.
And the outer cover 13(of disc drive appts 1 is fixed on reference to Fig. 2 in the upper end of axle 21).Basal part 22 is fixed on by cup portion 23 in the bottom of axle 21.
As previously mentioned, basal part 22 is that the apparatus housing 12(of disc drive appts 1 is with reference to Fig. 2) a part, and the parts that are connected as a single entity by other positions with apparatus housing 12 form.But basal part 22 and apparatus housing 12 can be also the parts of split.Basal part 22 comprises the base plate 221 of radially expansion and the roughly maintaining part 222 cylindraceous of giving prominence to towards top from the inner edge of base plate 221.Basal part 22 is such as being formed by metals such as aluminium alloys.
Cup portion 23 is for being configured near the circular position, bottom of axle 21.In the present embodiment, axle 21 and cup portion 23 consist of the parts that are connected as a single entity.But axle 21 and cup portion 23 can be also the parts of split.
The roughly wall cylindraceous portion 232 that cup portion 23 comprises the plectane portion 231 of extending towards radial outside from axle and extends towards top from the outer rim of plectane portion 231.Wall portion 232 is fixed on the inner peripheral surface of the maintaining part 222 of basal part 22.By plectane portion 231 and wall portion 232, the shape that cup portion 23 is configured to its longitudinal section is roughly L word shape.
Board 24 is for being fixed on the roughly circular parts of the outer peripheral face of axle 21.Board 24 surrounds axle 21 above the plectane portion 231 of cup portion 23.Board 24 is pressed near the upper end of axle 21, and is fixed on axle 21 by binding agent.But axle 21 also can consist of the parts that are connected as a single entity with board 24.
In the present embodiment, board 24 comprises flat part 241 and annular convex 242.Flat part 241 is fixed on the outer peripheral face of axle 21, and expands from axle 21 to radial outside.Annular convex 242 is roughly cylindric extension from the outer rim of flat part 241 towards downside.More particularly, annular convex 242 is extended towards downside from the lower surface of the outer rim of flat part 241.
In the present embodiment, the imaginary plane that annular convex 242 expressions form than the lower surface that extends flat part 241 to radial outside is the position of side on the lower.Therefore, flat part 241 comprises the flat part outer peripheral face 2411 that forms a part for labyrinth seal portion 61 in aftermentioned.And annular convex 242 comprises the annular convex outer peripheral face 2421 that forms a part for capillary seal portion 51 in aftermentioned.
In addition, annular convex also can represent that ratio in present embodiment extends imaginary plane that the inner peripheral surface of annular convex 242 forms by the position of radial outside to axial top.In this structure, annular convex comprises the outer peripheral face of a part of the upper labyrinth seal of formation portion 61 and the outer peripheral face of a part for the upper capillary seal of formation portion 51.
Stator unit 25 comprises stator core 251 and a plurality of coil 252.Stator core 251 comprises circular iron core back 71 and a plurality of tooth 72.Iron core back 71 is fixed on the outer peripheral face of the maintaining part 222 of basal part 22.Each tooth 72 is outstanding from iron core back 71 to radial outside.Stator core 251 is the stacked steel plate for forming at axial stacked electromagnetic steel plate for example.Coil 252 consists of the wire that is wound in the surrounding of each tooth 72.
Rotating part 3 comprises sleeve 31, wheel hub 32, rotor magnet 33 and cap 34.
Sleeve 31 rotates centered by central axis 9 in the surrounding of axle 21.Sleeve 31 comprises annulus portion 311, outside cylindrical portion 312, inside cylindrical portion 313 and the intercommunicating pore 314 suitable with the cylindrical portion 312A of Fig. 1.It is roughly circular that annulus portion 311 is.In annulus portion 311, be formed with the intercommunicating pore 314 that extends to vertically lower surface from upper surface.The roughly cylindraceous part of outside cylindrical portion 312 for extending upward from the outer rim of annulus portion 311.And, the roughly part cylindraceous that inside cylindrical portion 313 extends upward for the Inner edge from annulus portion 311.At the inner peripheral surface of sleeve 31, the face of the inner peripheral surface of the inner peripheral surface of annulus portion 311 and inside cylindrical portion 313 for being integrated continuously.The outer peripheral face of the inner peripheral surface of sleeve 31 and axle 21 across small gap at diametrically contraposition.
The annulus portion 311 of sleeve 31 and inside cylindrical portion 313 in axial arrangement between the flat part 241 of board 24 and the plectane portion 231 of cup portion 23.
Wheel hub 32 comprises top plate portion 321, cylindrical portion 322 and flange part 323.Top plate portion 321 is from the upper end of the outside cylindrical portion 312 of sleeve 31 to the roughly discoideus part of radial outside expansion.Cylindrical portion 322 is the roughly parts cylindraceous of extending downwards from the outer rim of top plate portion 321.And flange part 323 is from the lower end of cylindrical portion 322 to the outstanding part of radial outside.
At least a portion of the outer peripheral face of cylindrical portion 322 becomes the contact-making surface contacting with the interior perimembranous of 2 discs 14.And the upper surface of flange part 323 becomes the mounting surface of the disc 14 of mounting hypomere.The disc 14 of hypomere loads in the upper surface of flange part 323, and the disc 14 of epimere loads in the top of the disc 14 of described hypomere across pad 141.The interior perimembranous of each disc 14 contacts with the outer peripheral face of cylindrical portion 322, has determined thus the position radially of each tooth 14.Thus, the support that cylindrical portion 322 and flange part 323 are 2 discs 14 of supporting.
In the present embodiment, sleeve 31 and wheel hub 32 consist of the parts that are connected as a single entity.The material of sleeve 31 and wheel hub 32 is such as using the metals such as ferromagnetism stainless steel.But sleeve 31 and wheel hub 32 can be also the parts of split.
Rotor magnet 33 is fixed on the inner peripheral surface of the cylindrical portion 322 of wheel hub 32.Rotor magnet 33 forms circular centered by central axis 9.The outer peripheral face of a plurality of teeth 72 of the inner peripheral surface of rotor magnet 33 and stator core 251 is at diametrically contraposition.And the inner peripheral surface of rotor magnet 33 is the magnetic pole strength of the N utmost point and S utmost point alternative arrangement.
Cap 34 is for being fixed on the parts of ring-type of upper surface of the top plate portion 321 of wheel hub 32.Cap 34 is positioned at the top of capillary seal portion 51 in aftermentioned.Cap 34 for example obtains by punch process metal.But cap 34 both can be obtained by other method, it can be also synthetic resin.Cap 34 in present embodiment comprises plate-like portion 341 and protuberance 342.Plate-like portion 341 is the roughly discoid of radially expansion, and its outer end is fixed on the top plate portion 321 of wheel hub 32.Protuberance 342 is outstanding downwards from the inner edge of plate-like portion 341.The outer peripheral face of the inner peripheral surface of protuberance 342 and board 24 across small gap at diametrically contraposition.
As shown in Figure 4, in the small gap between axle 21, cup portion 23 and board 24 and sleeve 31, have lubricating oil 40.Lubricating oil 40 is for example used the oil that polyol-ester type oil or dibasic acid ester class wet goods ester are main component.
As shown in Figure 3, rotating part 3 is supported to and can with respect to stationary part 2, rotates across lubricating oil 40.In the present embodiment, axle 21, cup portion 23, board 24, sleeve 31 and lubricating oil 40 are formed in the FDB portion 4 that connects stationary part 2 and rotating part 3 under can counterrotating state.
In such Spindle Motor 11, if provide drive current to the coil 252 of stationary part 2, a plurality of teeth 72 at stator core 251 produce magnetic flux radially.And, by the effect of the magnetic flux between tooth 72 and rotor magnet 33, produce circumferential torque.Thus, rotating part 3 rotates centered by central axis 9 with respect to stationary part 2.The disc 14 being supported by wheel hub 32 and together rotation centered by central axis 9 of rotating part 3.
Structure referring to Fig. 3 and Fig. 4 convection cell bearing portion 4 describes.
As shown in Figure 4, FDB portion 4 comprises capillary seal portion 51, the 54, the 3rd gap 55, the 53, the 2nd gap, lower capillary seal portion the 52, the 1st gap, upper labyrinth seal portion 61 and lower labyrinth seal portion 62.
The inner peripheral surface that upper capillary seal portion 51 is the outside cylindrical portion 312 of annular convex outer peripheral face 2421 and sleeve 31 by the outer peripheral face of annular convex 242 forms.Be annular convex outer peripheral face 2421 across upper capillary seal portion 51 and with the inner peripheral surface of outside cylindrical portion 312 at diametrically contraposition.And the interval radially of upper capillary seal portion 51 is along with downward dwindling.
In the present embodiment, board 24 comprises flat part 241 and the annular convex 242 of extending downwards.Sleeve 31 comprises annulus portion 311, outside cylindrical portion 312, inside cylindrical portion 313 and intercommunicating pore 314.And cup portion 23 comprises plectane portion 231 and wall portion 232.Thus, while only having flat part 241 with board 24, compare, can axially form more longways capillary seal portion 51.Therefore, can be in the slimming that axially realizes Spindle Motor 11.
As shown in Figure 4, sleeve 31 comprises the 1st outer peripheral face 521 and the 2nd outer peripheral face 621.More particularly, the annulus portion 311 of sleeve 31 comprises the 1st outer peripheral face 521.And the outside cylindrical portion 312 of sleeve 31 comprises the 2nd outer peripheral face 621.The 2nd outer peripheral face 621 is positioned at the axial top of the 1st outer peripheral face 521.And wall portion 232 comprises the 1st inner peripheral surface 522 and the 2nd inner peripheral surface 622.The 1st inner peripheral surface 522 is positioned at the bottom of the inner peripheral surface of wall portion 232.The 2nd inner peripheral surface 622 is positioned at the axial top of the 1st inner peripheral surface 522.
In addition, outside cylindrical portion also can comprise the 1st outer peripheral face 521 of a part of the lower capillary seal of formation portion 52 and the 2nd outer peripheral face 621 of a part for the lower labyrinth seal of formation portion 62.
Lower capillary seal portion 52 consists of the 1st outer peripheral face 521 and the 1st inner peripheral surface 522.The 1st outer peripheral face 521 across lower capillary seal portion 52 and with the 1st inner peripheral surface 522 at diametrically contraposition.And the interval radially of lower capillary seal portion 52 is along with downward dwindling.
The 1st gap 53 consists of the lower surface of annular convex 242 and the upper surface of annulus portion 311.The 2nd gap 54 consists of the outer peripheral face of axle 21 and the inner peripheral surface of sleeve 31.The 3rd gap 55 consists of the lower surface of annulus portion 311 and the upper surface of plectane portion 231.And the 1st gap 53 is communicated with axial by intercommunicating pore 314 with the 3rd gap 55.
Axial hydrodynamic groove row (omitting diagram) are set being positioned at lower surface inner side, annular convex 242 in the 1st gap 53 or the upper surface of annulus portion 311.Upper axial hydrodynamic groove row are for example spiral helicine groove row or lambdoid groove row.When Spindle Motor 11 drives, by upper axial hydrodynamic groove, be listed in lubricating oil 40 and produce dynamic pressure, thus axial hydrodynamic bearing on forming in the first gap 53.And, lower axial dynamic pressure groove row (omitting diagram) are set being positioned at upper surface inner side, plectane portion 231 in the 3rd gap 55 or the lower surface of annulus portion 311.Lower axial dynamic pressure groove row are for example spiral helicine groove row or lambdoid groove row.When Spindle Motor 11 drives, by lower axial dynamic pressure groove, be listed in lubricating oil and produce dynamic pressure, thereby under the 3rd gap 55 forms axial hydrodynamic bearing.Rotating part 3 is axially being supported and is being rotated by upper axial hydrodynamic bearing and lower axial hydrodynamic bearing.
And, at the outer peripheral face that is positioned at inner peripheral surface the 2nd gap 54, sleeve 31 or axle 21, radial dynamic pressure groove row (omitting diagram) are set.Radial dynamic pressure groove row are for example lambdoid groove row.When Spindle Motor 11 drives, by radial dynamic pressure groove, be listed in lubricating oil 40 and produce dynamic pressure, thereby form Journal Bearings in Hydrodynamic Lubrication in the 2nd gap 54.Rotating part 3 is radially being supported and is being rotated by Journal Bearings in Hydrodynamic Lubrication.In addition, in the 2nd gap 54, Journal Bearings in Hydrodynamic Lubrication both can be set to 1 and also can be set to more than 2.
As previously mentioned, filling lubricating oil 40 in the small gap between axle 21, cup portion 23 and board 24 threes and sleeve 31.Between stationary part 2 and rotating part 3, on comprising, in the space of capillary seal portion 51, the 54, the 3rd gap 55, the 53, the 2nd gap, the 1st gap, intercommunicating pore 314 and lower capillary seal portion 52, have lubricating oil 40.
When Spindle Motor 11 is static, the upper liquid level 401 of lubricating oil 40 is positioned at capillary seal portion 51.And when static, the lower liquid level 402 of lubricating oil 40 is positioned at lower capillary seal portion 52.Thus, the upper liquid level 401 of lubricating oil 40 and lower liquid level 402 form concave-convex lens shape because surface tension makes liquid level.Consequently, having suppressed lubricating oil 40 spills from upper liquid level 401 and lower liquid level 402.
The axial interval of the peripheral part in the 1st gap 53 is along with expanding towards radial outside.Equally, the axial interval of the peripheral part in the 3rd gap 55 is along with expanding towards radial outside.Thus, in the 1st gap 53 and the 3rd gap 55, while producing bubble in lubricating oil 40, bubble is sent to capillary seal portion 51 sides and lower capillary seal portion 52 sides.The bubble having suppressed in the 1st gap 53 and the 3rd gap 55 is detained, and the expulsion efficiency of bubble is improved.
Upper labyrinth seal portion 61 consists of the inner peripheral surface of flat part outer peripheral face 2411 and protuberance 342.As previously mentioned, the inner peripheral surface of flat part outer peripheral face 2411 and protuberance 342 is radially opposed across small gap.Thus, can suppress gas from this gap turnover.Consequently, suppressed lubricating oil 40 from upper liquid level 401 evaporations.
In the present embodiment, upper labyrinth seal portion 61 is positioned at the position by radially inner side than upper capillary seal portion 51.Thus, from central axis 9 to the distance of labyrinth seal portion 61 shorten, and the aperture area in the gap at upper labyrinth seal portion 61 places diminishes.Thus, more suppressed the gas turnover at upper labyrinth seal portion 61 places.Consequently, more suppressed lubricating oil 40 from upper liquid level 401 evaporations.
Thus, compare when there is no protuberance 342, can axially lengthen the inner peripheral surface of cap 34.Thus, labyrinth seal portion 61 can axially lengthened.Therefore, more suppressed the gas turnover at upper labyrinth seal portion 61 places.Consequently, more suppressed lubricating oil 40 from upper liquid level 401 evaporations.
Lower labyrinth seal portion 62 consists of the 2nd outer peripheral face 621 and the 2nd inner peripheral surface 622.The 2nd outer peripheral face 621 and the 2nd inner peripheral surface 622 are radially opposed across small gap.Suppressed thus the turnover of the gas of this gap location.Consequently, can cross inhibition lubricating oil 40 from lower liquid level 402 evaporations.
In the present embodiment, as previously mentioned, above the 1st outer peripheral face 521 of sleeve 31 capillary seal portion 52 under forming, comprise the 2nd outer peripheral face 621 of labyrinth seal portion 62 under formation.That is, the sleeve 31 of present embodiment is the parts that are connected that comprise the 1st outer peripheral face 521 and the 2nd outer peripheral face 621.Thus, form and comprise that the parts of the 1st outer peripheral face 521 compare with the parts that comprise the 2nd outer peripheral face 621 with parts by split, can prevent the relative position skew of the 1st outer peripheral face 521 and the 2nd outer peripheral face 621.Therefore, can precision form well lower capillary seal portion 52 and lower labyrinth seal portion 62.
And, in the present embodiment, as previously mentioned, above the 1st inner peripheral surface 522 of capillary seal portion 52 under forming of wall portion 232, comprise the 2nd inner peripheral surface 622 of labyrinth seal portion 62 under forming.The wall portion 232 that is present embodiment is the parts that are connected that comprise the 1st inner peripheral surface 522 and the 2nd inner peripheral surface 622.Thus, compare when forming by minute body component the parts that comprise the parts of the 1st inner peripheral surface 522 and comprise the 2nd inner peripheral surface 622, can prevent that the 1st inner peripheral surface 522 and the 2nd inner peripheral surface 622 relative positions are offset.
Therefore, precision forms lower capillary seal portion 52 and lower labyrinth seal portion 62 well more.
In addition, in the present embodiment, although lower labyrinth seal portion 62 consists of the outer peripheral face of sleeve 31 and the inner peripheral surface of wall portion 232, the present invention is not limited to this.Lower labyrinth seal portion 62 for example also can consist of the inner peripheral surface of the outer peripheral face of sleeve 31 and the maintaining part 222 of basal part 22.
As shown in Figure 4, in the present embodiment, upper capillary seal portion 51 is positioned at the position by radially inner side than lower capillary seal portion 52 and lower labyrinth seal portion 62.And, upper capillary seal portion 51 with lower labyrinth seal portion 62 at least a portion radially overlapping.Thus, can guarantee the length of upper capillary seal portion 51, lower capillary seal portion 52 and lower labyrinth seal portion 62, and can axially make Spindle Motor 11 slimming more.
At this, in passing through the cross section of central axis 9, the angle that in formation, the annular convex outer peripheral face 2421 of capillary seal portion 51 and the inner peripheral surface of outside cylindrical portion 312 form is the 1st angle θ 1.And the 1st outer peripheral face 521 and the formed angle of the 1st inner peripheral surface 522 of capillary seal portion 52 are the 2nd angle θ 2 under forming.
In the present embodiment, the 1st angle θ 1 be 1 degree or be greater than 1 degree and be less than 8 degree or 8 degree angles, the 2nd angle θ be 1 degree or be greater than 1 degree and be less than 10 degree or 10 degree angles.In addition, preferably the 1st angle θ 1 is 2 degree or is greater than 2 degree and is less than 6 degree or the angle of 6 degree, and preferably the 2nd angle θ 2 is 3 degree or is greater than the angle that 3 degree are less than 8 degree or 8 degree.And more preferably the 1st angle θ 1 is 2 degree or is greater than 2 degree and is less than 4 degree or the angle of 4 degree, more preferably the 2nd angle θ 2 is 4.5 degree or is greater than 4.5 degree and is less than 6.5 degree or the angle of 6.5 degree.Thus, can suppress the change of the height of upper liquid level 401 at capillary seal portion 51 places and the height of the lower liquid level 402 at lower capillary seal portion 52 places.
Particularly in this Spindle Motor 11, as shown in Figure 4, the Breadth Maximum radially of upper capillary seal portion 51 is less than the Breadth Maximum radially of lower capillary seal portion 52.And the axial length of capillary seal portion 52 is little under the axial Length Ratio of upper capillary seal portion 51.And in the present embodiment, the 1st angle θ 1 to the 2 angle θ 2 is little.Thus, the change of the height of the lower liquid level 402 of lower capillary seal portion 52 is less than the change of the height of the upper liquid level 401 of upper capillary seal portion 51.Consequently, more having suppressed lubricating oil 40 spills from lower capillary seal portion 52.
In the present embodiment, under the volumetric ratio of the upside of the upper liquid level 401 of upper capillary seal portion 51, the volume of the upside of the lower liquid level 402 of capillary seal portion 52 is little.Therefore, the part more than needed of lower capillary seal portion 52 is larger than the part more than needed of upper capillary seal portion 51.Consequently, more having suppressed lubricating oil 40 spills from lower capillary seal portion 52.
Therefore, by the structure of present embodiment, can suppress the axial length of Spindle Motor 11 integral body, and can suppress lubricating oil 40 and spill from lower capillary seal portion 52.
And when injecting lubricating oil 40, structurally, the height of the lower liquid level 402 under the aspect ratio of the upper liquid level 401 in upper capillary seal portion 51 in capillary seal portion 52 more easily carries out the confirmations such as visual or measurement.Particularly in the present embodiment, lower capillary seal portion 52 and lower labyrinth seal portion 62 consist of same parts, and, because sleeve 31 and wheel hub 32 consist of parts, therefore when injecting lubricating oil 40, the confirmation of lower liquid level 402 difficulty that becomes.And even if sleeve part 31 and wheel hub 32 consist of the parts of split, before the injection process of lubricating oil 40, the parts of split are sometimes interfixed and are become all-in-one-piece parts.Now, when injecting lubricating oil 40, the confirmation of the lower liquid level 402 of lower capillary seal portion 52 also becomes difficulty.Therefore,, in such a Spindle Motor 11, by above-described structure, can suppress the present invention that lubricating oil 40 spills from lower capillary seal portion 52 particularly useful.
As shown in Figure 4, in the present embodiment, in formation the inner peripheral surface of the outside cylindrical portion 312 of capillary seal portion 51 to axial top and radially inner side tilt.And, annular convex outer peripheral face 2421 to axial top and radially inner side tilt.Go up capillary seal portion 51 along with tilting to radially inner side towards top.Therefore, when Spindle Motor 11 drives, lubricating oil 40 effects in upper capillary seal portion 51 have towards on the centrifugal force of bottom side of capillary seal portion 51.Therefore, can suppress the outside of lubricating oil 40 from upper capillary seal portion 51 to Spindle Motor 11 spills.And, by this shape, can guarantee the thickness radially on the top of outside cylindrical portion 312.Thus, can guarantee thickness radially and the intensity of boundary vicinity of 321 of the top plate portions of outside cylindrical portion 312 and wheel hub 32.
And in the present embodiment, lower capillary seal portion 52 is positioned at the position by radial outside than upper capillary seal portion 51.The 1st outer peripheral face 521 and central axis 9 almost parallels of capillary seal portion 52 under forming.And, form time the 1st inner peripheral surface 522 of capillary seal portion 52 to axial top and radial outside inclination.Thus, can guarantee radial thickness and the intensity of the boundary vicinity of 312, the annulus portion 311 of sleeve 31 and outside cylindrical portion.
Above exemplary execution mode of the present invention is illustrated, but the present invention is not limited to above-described execution mode.
Fig. 5 is the partial, longitudinal cross-sectional of the related Spindle Motor of the variation of the 2nd execution mode.In the example of Fig. 5, the outer peripheral face of annular convex 242B that is positioned at the bottom of board 24B is annular convex outer peripheral face 2421B, by being curve in the cross section of central axis 9B.Now, in passing through the cross section of central axis 9B, the 1st angle θ 1B is the tangent line at the place of point arbitrarily and the formed angle of inner peripheral surface of the 312B of outside cylindrical portion of annular convex outer peripheral face 2421B.In the example of Fig. 5, the upper capillary seal 51B of portion represents that the 1st angle θ 1B is 1 degree or is greater than the region that 1 degree is less than the angle of 8 degree or 8 degree.As shown in Figure 5, form the face of each capillary seal portion, by the cross section of central axis 9B, both can only by curve, be formed, and, also can be formed by the different straight line of a plurality of angles or curve.
Fig. 6 is the partial, longitudinal cross-sectional of the related Spindle Motor of the variation of the 1st execution mode.As shown in Figure 6, suction sealing 81C also can be set below the upper capillary seal 51C of portion.In the example of Fig. 6, below the upper capillary seal 51C of portion, cylindrical portion 312C within it side face comprises the banded slot part 810C that is provided with suction socket row.Therefore, outer peripheral face and the slot part 810C by board 24C forms suction sealing 81C.The upper end of suction sealing 81C is mutually continuous with the bottom of the upper capillary seal 51C of portion.
During cylindrical portion 312C rotation, by slot part 810C, lubricating oil 40C is pressed to downside.Thus, the upper liquid level 401C of lubricating oil 40C moves to position on the lower, the position than as shown in Figure 6.Consequently, can suppress lubricating oil 40C spills from the upper capillary seal 51C of portion.Like this, if any one in upper and lower capillary seal portion below arrange suction sealing structure, easily realize the equilibrium of the pressure of upper and lower liquid level.And, with not being set, suction sealing compares, can suppress the axial size of capillary seal portion.It is Spindle Motor slimming more.In addition, suction socket is listed as the outer peripheral face that also can not be arranged on the inner peripheral surface of cylindrical portion 312C and be arranged on board 24C.And suction socket row also can be arranged on the inner peripheral surface of cylindrical portion 312C and the outer peripheral face of board 24C.
And in the 2nd execution mode, although upper labyrinth seal portion consists of the outer peripheral face of board and the inner peripheral surface of cap, the present invention is not limited to this.For example, upper labyrinth seal portion also can consist of the outer peripheral face of axle and the inner peripheral surface of cap.
And each key element occurring in above-mentioned execution mode or variation can be carried out appropriately combined in the scope that does not produce contradiction.
The present invention can be used in Spindle Motor and disc drive appts.The preferred embodiment of the present invention according to the above description can think, the distortion and the change that do not exceed to those skilled in the art scope and spirit of the present invention are obvious.Therefore scope of the present invention is determined by these claims uniquely.
Claims (15)
1. a Spindle Motor, is characterized in that, described Spindle Motor comprises:
Stationary part, it comprises along the axle of the central axis configuration of upper downward-extension; And
Rotating part, its surrounding at described axle is supported to and can centered by described central axis, rotates,
Described stationary part comprises:
Described axle;
Plectane portion, it extends towards radial outside from described axle;
Wall cylindraceous portion roughly, its outer rim from described plectane portion is extended upward; And
Circular board roughly, it surrounds described axle above described plectane portion,
Described rotating part comprises sleeve, the intercommunicating pore that described sleeve comprises roughly circular annulus portion, the cylindrical portion of extending upward from the outer rim of described annulus portion and connects vertically described annulus portion,
The outer peripheral face of described board is across upper capillary seal portion and opposed with the inner peripheral surface of described cylindrical portion, and the interval radially of described upper capillary seal portion is along with downward dwindling,
The outer peripheral face of described sleeve is across lower capillary seal portion and opposed with the inner peripheral surface of described wall portion, and the interval radially of described lower capillary seal portion is along with downward dwindling,
Between described stationary part and described rotating part, in following space, have lubricating oil, described space comprises:
Described upper capillary seal portion;
The 1st gap, it is between the lower surface of described board and the upper surface of described sleeve;
The 2nd gap, it is between the outer peripheral face of described axle and the inner peripheral surface of described sleeve;
The 3rd gap, between its lower surface at described sleeve and the upper surface of described plectane portion;
Described intercommunicating pore, it is axially being communicated with described the 1st gap and described the 3rd gap; And
Described lower capillary seal portion,
When static, the upper liquid level of described lubricating oil is positioned at described upper capillary seal portion,
When static, the lower liquid level of described lubricating oil is positioned at described lower capillary seal portion,
By in the cross section of described central axis, to state the outer peripheral face of board be 1 degree with formed the 1st angle of the inner peripheral surface of described cylindrical portion in capillary seal portion place on described or be greater than 1 degree and be less than 8 degree or 8 angles of spending,
By in the cross section of described central axis, the outer peripheral face of stating sleeve in described lower capillary seal portion place is 1 degree or is greater than 1 degree and is less than 10 degree or 10 angles of spending with formed the 2nd angle of inner peripheral surface of described wall portion,
The Breadth Maximum radially of described upper capillary seal portion is less than the Breadth Maximum radially of described lower capillary seal portion,
Described in the axial Length Ratio of described upper capillary seal portion, the axial length of lower capillary seal portion is little.
2. Spindle Motor according to claim 1, is characterized in that,
Described board comprises:
Flat part, it is radially expanded; And
Annular convex, its outer rim from described flat part is extended downwards,
Described upper capillary seal portion consists of the outer peripheral face of described annular convex and the inner peripheral surface of described cylindrical portion.
3. Spindle Motor according to claim 1, is characterized in that,
Described the 1st angle is less than described the 2nd angle.
4. Spindle Motor according to claim 1, is characterized in that,
Form the inner peripheral surface of described cylindrical portion of described upper capillary seal portion along with tilting to radially inner side towards top.
5. Spindle Motor according to claim 1, is characterized in that,
Described lower capillary seal portion is positioned at the position by radial outside than described upper capillary seal portion,
Form outer peripheral face and the central axis almost parallel of the described sleeve of described lower capillary seal portion,
Form the inner peripheral surface of described wall portion of described lower capillary seal portion along with tilting to radial outside towards top.
6. Spindle Motor according to claim 1, is characterized in that,
Described in the volumetric ratio of the upside of the described upper liquid level of described upper capillary seal portion, the volume of the upside of the described lower liquid level of lower capillary seal portion is little.
7. Spindle Motor according to claim 1, is characterized in that,
Described rotating part also comprises the roughly circular cap of the top that is positioned at capillary seal portion,
A side in the outer peripheral face of described axle and the outer peripheral face of described board and the inner peripheral surface of described cap are radially opposed across small gap, and the upper labyrinth seal of formation portion.
8. Spindle Motor according to claim 7, is characterized in that,
Described cap comprises:
Circular plate-like portion roughly, it is radially expanded; And
Protuberance, its inner edge from described plate-like portion is outstanding downwards,
The side of described upper labyrinth seal portion in the outer peripheral face of described axle and the outer peripheral face of described flat part and the inner peripheral surface of described protuberance form.
9. Spindle Motor according to claim 7, is characterized in that,
Described upper labyrinth seal portion is positioned at the position by radially inner side than described upper capillary seal portion.
10. according to the Spindle Motor described in any one in claim 1 to 9, it is characterized in that,
Described wall portion comprises:
The 1st inner peripheral surface, it forms described lower capillary seal portion; And
The 2nd inner peripheral surface, it is positioned at the position by axial top than described the 1st inner peripheral surface,
The outer peripheral face of described sleeve and described the 2nd inner peripheral surface are radially opposed across small gap, and labyrinth seal portion under forming.
11. according to the Spindle Motor described in any one in claim 1 to 9, it is characterized in that,
Described upper capillary seal portion is positioned at the position by radially inner side than described lower labyrinth seal portion,
Described upper capillary seal portion and described lower labyrinth seal portion at least a portion are radially overlapping.
12. according to the Spindle Motor described in any one in claim 1 to 9, it is characterized in that,
The axial interval of the peripheral part in described the 1st gap is along with expanding towards radial outside.
13. according to the Spindle Motor described in any one in claim 1 to 9, it is characterized in that,
The axial interval of the peripheral part in described the 3rd gap is along with expanding towards radial outside.
14. according to the Spindle Motor described in any one in claim 1 to 9, it is characterized in that,
Described cylindrical portion comprises the banded slot part that is provided with suction socket row at inner peripheral surface,
Outer peripheral face and described slot part by described board form suction sealing,
The upper end of described suction sealing is mutually continuous with the bottom of described upper capillary seal portion.
15. 1 kinds of disc drive appts, is characterized in that, it has:
Spindle Motor described in any one in claim 1 to 14, it comprises basal part;
Access portion, its to by the disc of the described rotating part of described Spindle Motor supporting, carried out reading of information and write at least one; And
Outer cover,
Described rotating part and described access portion are contained in the inside of the housing consisting of described basal part and described outer cover.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013012217A JP6112344B2 (en) | 2013-01-25 | 2013-01-25 | Spindle motor and disk drive device |
| JP2013-012217 | 2013-01-25 | ||
| US13/798,857 | 2013-03-13 | ||
| US13/798,857 US8773816B1 (en) | 2013-03-13 | 2013-03-13 | Spindle motor with hydrodynamic bearing structure having capillary seal and disk drive apparatus including same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103973021A true CN103973021A (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420027581.3U Expired - Fee Related CN203896089U (en) | 2013-01-25 | 2014-01-16 | Main shaft motor and disc driving device |
| CN201410019329.2A Pending CN103973021A (en) | 2013-01-25 | 2014-01-16 | Spindle Motor And Drive Apparatus |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420027581.3U Expired - Fee Related CN203896089U (en) | 2013-01-25 | 2014-01-16 | Main shaft motor and disc driving device |
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| CN (2) | CN203896089U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049938A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Capillary magnetic liquid sealing device |
| CN112431926A (en) * | 2020-11-23 | 2021-03-02 | 清华大学 | Magnetic liquid sealing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203896089U (en) * | 2013-01-25 | 2014-10-22 | 日本电产株式会社 | Main shaft motor and disc driving device |
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| US6307291B1 (en) * | 1998-10-08 | 2001-10-23 | Seiko Instruments Inc. | Hydraulic dynamic bearing and spindle motor and rotary assembly provided |
| CN101922512A (en) * | 2009-06-12 | 2010-12-22 | 日本电产株式会社 | Bearing means, spindle motor and disk drive device |
| CN102072254A (en) * | 2009-11-25 | 2011-05-25 | 日本电产株式会社 | Dynamic pressure bearing and spindle motor using the same |
| US20120326543A1 (en) * | 2009-06-12 | 2012-12-27 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| CN203896089U (en) * | 2013-01-25 | 2014-10-22 | 日本电产株式会社 | Main shaft motor and disc driving device |
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2014
- 2014-01-16 CN CN201420027581.3U patent/CN203896089U/en not_active Expired - Fee Related
- 2014-01-16 CN CN201410019329.2A patent/CN103973021A/en active Pending
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| US6307291B1 (en) * | 1998-10-08 | 2001-10-23 | Seiko Instruments Inc. | Hydraulic dynamic bearing and spindle motor and rotary assembly provided |
| CN101922512A (en) * | 2009-06-12 | 2010-12-22 | 日本电产株式会社 | Bearing means, spindle motor and disk drive device |
| US20120326543A1 (en) * | 2009-06-12 | 2012-12-27 | Nidec Corporation | Bearing apparatus, spindle motor, and disk drive apparatus |
| CN102072254A (en) * | 2009-11-25 | 2011-05-25 | 日本电产株式会社 | Dynamic pressure bearing and spindle motor using the same |
| CN203896089U (en) * | 2013-01-25 | 2014-10-22 | 日本电产株式会社 | Main shaft motor and disc driving device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049938A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Capillary magnetic liquid sealing device |
| CN112049938B (en) * | 2020-09-08 | 2021-05-18 | 清华大学 | Capillary magnetic liquid sealing device |
| US11300211B2 (en) | 2020-09-08 | 2022-04-12 | Tsinghua University | Capillary magnetic-liquid sealing device |
| CN112431926A (en) * | 2020-11-23 | 2021-03-02 | 清华大学 | Magnetic liquid sealing device |
| CN112431926B (en) * | 2020-11-23 | 2022-03-25 | 清华大学 | Magnetic liquid sealing device |
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|---|---|
| CN203896089U (en) | 2014-10-22 |
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Application publication date: 20140806 |