CN100406194C - Methods of manufacturing fluid-dynamic-pressure bearing and spindle motor incorporating the bearing, and spindle motor - Google Patents
Methods of manufacturing fluid-dynamic-pressure bearing and spindle motor incorporating the bearing, and spindle motor Download PDFInfo
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- CN100406194C CN100406194C CNB2005100730537A CN200510073053A CN100406194C CN 100406194 C CN100406194 C CN 100406194C CN B2005100730537 A CNB2005100730537 A CN B2005100730537A CN 200510073053 A CN200510073053 A CN 200510073053A CN 100406194 C CN100406194 C CN 100406194C
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2202/00—Solid materials defined by their properties
- F16C2202/60—Oil repelling
Landscapes
- Sliding-Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Sealing Of Bearings (AREA)
- Motor Or Generator Frames (AREA)
Abstract
In spindle motors journaled on fluid-dynamic-pressure bearings, especially in such spindle motors employed in recording-disk drives in implementations that subject the drives to vibration and shock, sealing performance of a capillary seal formed between motor rotor-side and stator-side bearing surfaces, cohesiveness of oil-repellant on rotor-side/stator-side dry-area surfaces adjoining the capillary seal section, and motor inter-component adhesive strength are improved. The capillary-seal-constituting rotor-side/stator-side surface(s) are exposed to a plasma or to ultraviolet rays under predetermined conditions to improve the wettability of the surface(s) for the bearing fluid. The dry-area surface(s) are similarly irradiated so as to improve their wettability for the oil-repellant. Adhesively bonded component surfaces are likewise irradiated so as to improve their wettability for the adhesive, enhancing adhesive strength. Exposed surfaces may be constituted of a synthetic resin to enhance their wettability further, or may be made of metal, to yield a cleaning efficacy from the plasma/UV exposure.
Description
Technical field
The present invention relates to the manufacture method of hydrodynamic pressure bearing, manufacture method and the spindle motor and the indicator driver of spindle motor.
Background technology
In recent years, the information content of per unit area record increases day by day on the disc-shape recoding medium in hard disk and similar indicator driver, and information density is increasing.The packing density of Zeng Jiaing has caused requiring stably supporting disc-shape recoding medium under the rotation at a high speed day by day.
Simultaneously, the indicator driver is not only gone up at the stationary computer that uses driver traditionally (for example, desktop computer and server) and is obtained to use, and also obtains to use on car-mounted device, portable unit and other mobile device.This mobile application cause the requirement higher to shock resistance and durability (to as driver is subjected to vibrate with shock environment under adopt the unprecedented requirement of equipment of driver).
As background, be used under rotation at a high speed stably the bearing of supporting disk driver rotor unit in development.
In order to make bearing can meet this requirement, some very important consideration is:
(A) improve the sealing property of capillary seal (capillary seal) part of bearing;
(B) improve the ability that prevents along near the moistened surface diffusion the capillary seal part;
(C) raising constitutes the bonding strength of the element of hydrodynamic bearing and spindle motor.Consider (A)
Hydrodynamic pressure bearing comprises axle journal unit and axle journal support unit, is formed with narrow microgap between the two.In this microgap, maintain lubricating fluid, for example oil.The oil sealing mechanism that is called as the capillary seal part is arranged on microgap bearing, wherein said in the part of outside atmosphere opening.This capillary seal partly is such form, promptly wherein the gap between sealing surfaces relative on described axle journal and the axle journal support-side with this axle journal at bearing along axially upwards opening gradually.In the capillary seal part, form the boundary face between oil and the outside atmosphere.
If lubricating fluid is not enclosed by the capillary seal part, then fluid will leak into the outside.As a result, the lubricating fluid that remains in the microgap tails off, and finally can reduce the service life of bearing.In the bearing that is used for especially small-sized spindle motor and since remain on bearing inside oil total amount seldom, therefore even leaked micro-lubricating fluid, oil starvation also takes place easily.And the relatively poor sealing property problem in the capillary seal can make the vibration on the bearing or the integrality at other impact failure sealing strip interface.
It is less that oil and contact angle between the element that constitutes the capillary seal part are remained, and this intensity for the raising capillary seal is vital.
Consider (B)
On the element surface in the outside that constitutes the capillary seal part, apply oleophobic agent.Apply oleophobic agent and can prevent that lubricating fluid from flowing to the bearing outside owing to wetting diffusion from the capillary seal part along the bearing element surface.
The method that applies oleophobic agent is that the oleophobic agent that will be dissolved in the solvent is coated on the element surface, and makes the solvent vaporization so that oleophobic agent adheres to from the teeth outwards.
Yet oleophobic agent is very poor for the potted component wettability of the surface, this means that oleophobic agent is also unsatisfactory to the adhesiveness on surface.Therefore, oil removing or the relevant end operation in making hydrodynamic bearing all makes oleophobic agent peel off easily.Although because the performance of protective agent, all to use so far such as on element, carving stria or applying technology such as oleophobic agent thickly, this technology has improved the cost of element, and this is not a kind of radical solving method.
Consider (C)
The spindle motor that is used for hard disk drive is equipped with base element and as the cylindrical shroud cylinder shell of stator side bearing element, and this cover cylinder shell is fixed on the base element.The external peripheral surface of described cover cylinder shell is fixed on the inner circumferential surface that is formed at the installing hole in the base element by the adhesive that plugs.
Slight warpage in the spindle motor bearing element or distortion can give all especially that hydrodynamic pressure bearing brings problem, and this is because the bearing clearance is especially little.Based on this, often use adhesive rather than cause that easily the joint that is welded on a plurality of interactive elements of thermal deformation is adhesively fixed.
Especially under the environment of effect vibration and impact on the bearing (for example, in mobile and car-mounted device), king-sized load acts on the junction between the element.More specifically, install the occasion that to fall therein and understand the ability that mandatory requirement bears serious impact (greater than 1000G).Yet spindle motor by the result that ratio dwindles is, the inner member bond length shortens, and this has brought challenge to improving bonding strength.
Summary of the invention
First purpose of the present invention is to provide a kind of manufacture method that can improve the bonding strength in the spindle motor.
Second purpose of the present invention is to provide a kind of manufacture method of hydrodynamic pressure bearing, and it can improve the sealing property of capillary seal part.
The 3rd purpose of the present invention is to provide a kind of manufacture method of hydrodynamic pressure bearing, and it can stably adhere to this oleophobic surface with the oleophobic agent that is used for oleophobic surface.
The hydrodynamic pressure bearing of manufacture method that can implement the hydrodynamic pressure bearing of first aspect present invention has following structure.That is, described hydrodynamic pressure bearing comprises stator unit and with respect to this stator unit rotor rotated unit.Described stator unit and rotor unit cross a microgap toward each other.Lubricating fluid is filled and is remained in this microgap.
Between described stator unit and rotor unit, be formed with the gap that communicates with described microgap.The part that this gap communicates with described microgap is as the capillary seal part.In described capillary seal part, form the boundary face between lubricating fluid and the outside atmosphere.The apparent surface of described stator unit and rotor unit forms this capillary seal part.
A first aspect of the present invention is the manufacture method of the hydrodynamic pressure bearing that proposed just now, comprises following at least first and second steps.In first step, carry out surface treatment process at least one surface in rotor-side surface that constitutes described capillary seal part and stator-side surface, this surface treatment process comprises at least a in shining of plasma irradiation and ultraviolet wire harness.In addition, after first step is finished (not need after finishing immediately), can carry out second step, in this step, in described microgap, inject lubricating fluid.
First step in first aspect present invention can carry out before the rotor unit of described hydrodynamic pressure bearing and stator unit assembling.Especially, the appropriate section of described rotor unit and stator unit can be carried out the surface treatment process of first step respectively.Equally, can on described two stator units and rotor unit, carry out the surface treatment process of first step, its can be on described rotor unit and stator unit simultaneously or do not carry out simultaneously.
Can between described first and second steps, comprise assembling, heating, pressurization and the bearing manufacturing process of cleaning.
Implement first aspect present invention and improved the wetability of the surface of formation capillary seal part, thereby make angle of wetting minimum with respect to organic substance.Therefore, the wetability of raising has been improved the sealing property of capillary seal.Another advantage is, (one or more) capillary seal part surface carried out ultraviolet wire harness and plasma irradiation decompose and removed the organic substance that the metal surface adheres to, and these organic substances can make the degradation of lubricating fluid.Another benefit is that carrying out the irradiation of ultraviolet wire harness and plasma does not need to use environmentally harmful chemicals.And, and use chemicals or compare by the surface treatment of machining associated components, it is simple and the operating time is shorter to carry out the work of ultraviolet wire harness and plasma irradiation.Therefore, operability and productivity ratio have been improved.
In addition, can more advantageously carry out in described bearing clearance, filling second step process of lubricating fluid by described capillary seal part.Come fill bearing clearance by carrying out (one or more) surface that the irradiation of ultraviolet wire harness or plasma improved wetability, this can prevent to sneak in the lubricating fluid bubble.Therefore, can regulate the injection rate of lubricating fluid more accurately.
In addition according to a first aspect of the invention, advantageously, constitute that at least one surface is formed by resin material in the described stator unit of described capillary seal part and the rotor unit surface.Resin is by plasma irradiation or the irradiation of ultraviolet wire harness and by surface activation, and therefore (one or more) surface wetability for lubricating fluid has been improved on (one or more) surface that constitutes described hermetic unit by resin material.
Still according to a first aspect of the invention, constituting the stator unit of described capillary seal part and at least one surface in the rotor unit surface can be formed by metal.In the manufacture method in this case, advantageously, can be by at least a surface treatment process that on hardware, carries out to a greater degree in the first step in plasma irradiation and the irradiation of ultraviolet wire harness.Grease or other dust and dirt that sticks on the metal surface dissolved in cleaning based on isoionic cleaning or use ultraviolet wire harness, therefore is suitable for the bearing element of cleaning requirement ideally than high cleanliness.The cleaning of being undertaken by first step can make cleaning course and surface treatment process carry out simultaneously, and this makes this manufacture method have good operability.
Also according to a first aspect of the invention, can comprise third step, wherein at least one surface in stator unit surface that constitutes described microgap and rotor unit surface, comprise at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines.
The surface of described microgap constitutes the bearing surface of hydrodynamic pressure bearing.Improve the wetability of surface for lubricating fluid, this has strengthened the ability that bearing keeps lubricating fluid between described stator unit surface and the rotor unit surface.The hold facility of lubricant helps to prevent described stator unit surface and rotor unit is surperficial contacts between the surface of improving, and also is like this even bear under the situation of more powerful shock and vibration at bearing.
The hydrodynamic pressure bearing that can implement the hydrodynamic pressure bearing manufacture method of second aspect present invention has following structure.That is, with first aspect present invention in the identical mode of hydrodynamic pressure bearing, this hydrodynamic pressure bearing is to comprise stator unit and with respect to this stator unit rotor rotated unit.And, to form the capillary seal part with mode identical in first aspect present invention.In this capillary seal part, form the boundary face between lubricating fluid and the outside atmosphere.
In addition, in described stator unit or rotor unit, be provided with in abutting connection with the surface, arid region of described capillary seal part at least one.Form this surface, arid region so that described surface-coated has oleophobic agent.
The manufacture method of the hydrodynamic pressure bearing of aforesaid second aspect present invention comprises following first, second and third step.In first step, on the surface, arid region at least one of the stator side of bearing or rotor-side, comprise plasma irradiation and ultraviolet wire harness shine at least one surface treatment process.And (not need after finishing immediately) carries out second step after first step, applies oleophobic agent to (one or more) surface, arid region in this step.In addition, (not need after finishing immediately) carries out third step after second step, in this step at the inner lubricating fluid of filling of described microgap.
Identical with the situation of first step in first aspect present invention, first step is all inessential before or after the bearing assembling process.And, on described stator unit and rotor unit, carry out in the process of first step, can simultaneously or not carry out simultaneously for described two unit.In addition, can between the first step and second step or between second step and third step, carry out other step relevant (comprising assembling, heating, pressurization and cleaning) as required with making bearing.
Improved the wetability between this (one or more) surface, arid region and oleophobic agent in (one or more) surface, arid region by implementing a second aspect of the present invention.The wetability of this raising has prevented oleophobic agent come off (peeling off).Therefore, prevented lubricating fluid with (one or more) surface, arid region of capillary seal partial continuous on owing to wetting diffusion is flowed.
Because the centrifugal force when especially surface, the arid region of rotor unit rotates owing to rotor unit is easy to wetting diffusion, thus on the surface, arid region of described rotor unit, advantageously carry out first step, thus oleophobic agent can not peeled off.
In a second aspect of the present invention, also advantageously comprise the 4th step, wherein on described stator unit and rotor unit one, form capillary seal and partly locate to comprise in plasma irradiation and the ultraviolet ray irradiation surface treatment process of at least one.
And because the surface that constitutes (one or more) surface on described (one or more) surface, arid region and constitute described capillary seal part is adjacent to each other, so first step and the 4th step help to carry out high efficiency manufacturing work simultaneously.
Above-mentioned surface treatment process has improved the lubricating fluid hold facility of capillary seal part, and has prevented that oleophobic agent from peeling off, and these can both prevent effectively that lubricating fluid from leaking.
Also according to a second aspect of the invention, advantageously, constitute that at least one surface is formed by resin material in the stator unit surface of described capillary seal part and the rotor unit surface.Make resin at surface activation easily by plasma irradiation or the irradiation of ultraviolet wire harness, thereby improved adhesion strength between this (one or more) surface and the oleophobic agent with (one or more) surface that resin material constitutes described hermetic unit.
Still according to second aspect present invention, the surface, arid region in the stator unit side of described bearing and rotor unit side at least one can be formed by metal.In the manufacture method in this case, advantageously, on hardware, carry out one of at least the surface treatment process in the first step in can shining by plasma irradiation and ultraviolet wire harness to a greater degree.Grease or other dust and dirt that sticks on the metal surface dissolved in cleaning based on isoionic cleaning or use ultraviolet wire harness, therefore is suitable for the bearing element of cleaning requirement than high cleanliness ideally.The cleaning of being undertaken by first step can make cleaning course and surface treatment process carry out simultaneously, and this makes this manufacture method have fabulous operability.
Also according to second aspect present invention, can comprise the 5th step, wherein comprise at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines at least one surface in stator unit surface that constitutes described microgap and rotor unit surface.
The surface of described microgap constitutes the bearing surface of hydrodynamic pressure bearing.Improve the wetability of described surface for lubricating fluid, this has strengthened the ability that bearing keeps lubricating fluid between described stator unit surface and the rotor unit surface.The hold facility of lubricant helps to prevent described stator unit surface and rotor unit is surperficial contacts between the surface of improving, and also is like this even bear under the situation of more powerful shock and vibration at bearing.
The spindle motor of manufacture method that can implement the spindle motor of second aspect present invention has following structure.That is, described spindle motor is equipped with base element, is fixed on stator unit on this base element and supported with respect to this stator unit rotor rotated unit.Described base element is the base plate of spindle motor.At spindle motor is under the situation of dc brushless motor, is fixed on described base element or the stator unit around its stator that is wound with coil.
Stator unit defines an external peripheral surface.Described base element is provided with the bonding surface with the corresponding structure of shape of described stator unit external peripheral surface.Described stator unit adhesively is fixed on the base element.
The manufacture method of the spindle motor of aforesaid third aspect present invention comprises following first to third step.That is, in first step, in the bonding surface of the external peripheral surface of described stator unit or described base element, comprise at least a surface treatment process in one group of surface treatment process that plasma irradiation and ultraviolet wire harness shine at least one surface.In second step (it carries out), apply binding agent at least one surface in the bonding surface of the external peripheral surface of described stator unit or described base element after first step.Subsequently, in third step, described stator unit is inserted in the described base element, the external peripheral surface of described stator unit is assemblied on the bonding surface of described base element, thereby described stator unit and described base element are bondd by binding agent.In this external third step, described binding agent sclerosis, thus described stator unit is fixed on the described base element.The example of described binding agent sclerosis is comprised: if described binding agent is heat cured, then to its heating; If described binding agent is an anaerobic type, then with itself and air insulated; If described binding agent is UV-cured, then shine it with the ultraviolet wire harness; And if described binding agent is two-component system, it is mixed with curing agent.
Implement a third aspect of the present invention and improved surface by the binding agent bonding, therefore improved the adhesiveness between binding agent and the bonding surface with respect to the wetability of organic substance.Like this, just improved bonding strength fixedly the time when binding agent.And described surface is with respect to the fact that the wetability of binding agent improves, and binding agent can be entered in the close clearance between described stator unit and the base element, to produce more powerful bonding strength.Therefore, can make spindle motor firmer, antijamming capability (for example, shock and vibration) especially, this makes the longer service life of motor.
Also according to a third aspect of the invention we, advantageously, at least one is formed by resin material in the external peripheral surface of described stator unit and the bonding surface of described base plate.By plasma irradiation or the irradiation of ultraviolet wire harness resin is activated in the surface, therefore the wetability between this (one or more) surface and the binding agent has been improved on (one or more) surface that makes resin material constitute described stator unit/base plate.
Still according to third aspect present invention, at least one surface can be formed by metal in the external peripheral surface of described stator unit and the bonding surface of described base plate.In the manufacture method in this case, advantageously, on described stator unit and base plate, carry out one of at least the surface treatment process in the first step in can shining by plasma irradiation and ultraviolet wire harness to a greater degree.Based on isoionic cleaning or the grease or other dust and dirt that use ultraviolet cleaning to dissolve to stick on the metal surface, therefore be suitable for the spindle motor of cleaning requirement ideally than high cleanliness.The cleaning of being undertaken by first step can make cleaning course and surface treatment process carry out simultaneously, and this makes this manufacture method have fabulous operability.
In the spindle motor that utilizes the hydrodynamic pressure bearing of making by the manufacture method of first aspect present invention, the superior performance of capillary seal part, and the performance that improves this capillary seal helps to produce service life and the shock proof spindle motor with prolongation.
In addition, adopt the spindle motor of the hydrodynamic pressure bearing of making by the manufacture method of second aspect present invention, can make the surface that oleophobic agent applies keep stable oleophobic property, this helps to produce by the wetting diffusion that prevents lubricating fluid and has the spindle motor that increases the service life.
Adopt the indicator driver of the spindle motor of making by the manufacture method of third aspect present invention, especially improved the service life and the shock resistance of this motor.Constitute at described base element under the situation of disk drive housing, can prevent that the inner/outer air of indicator driver from overflowing/entering, this has just been avoided pollutant to enter the inside of housing.
Description of drawings
From the detailed description below in conjunction with accompanying drawing, above and other objects of the present invention, feature, aspect and advantage will become apparent to those skilled in the art.
Fig. 1 is the cutaway view of indicator driver of the present invention;
Fig. 2 is the cutaway view that relates to the hydrodynamic pressure bearing of first embodiment of the invention and use the spindle motor of this bearing;
Fig. 3 is the cutaway view that relates to the hydrodynamic pressure bearing of second embodiment of the invention and use the spindle motor of this bearing;
Fig. 4 is the cutaway view that relates to the hydrodynamic pressure bearing of third embodiment of the invention and use the spindle motor of this bearing; And
Fig. 5 is the local amplification view of the key feature of demonstration hydrodynamic pressure bearing of the present invention, has wherein inserted the zoomed-in view of capillary seal part.
The specific embodiment
Mode of the present invention is implemented in explanation below with reference to accompanying drawings.Should be appreciated that in the explanation of these embodiment when use did not have the term of expression direction of special marking, this nomenclature showed represented in the drawings direction; Therefore, this note is not limited in the direction of implementing among the present invention.
First embodiment
In the present embodiment, in the spindle motor 3 of rotation disc-shape recoding medium, adopt the hydrodynamic pressure bearing that utilizes manufacture method of the present invention to make.
Hard disk drive
With reference to figure 1, this figure is the cutaway view that shows as the hard disk drive 1 of implementing recording disk drive device of the present invention.This hard disk drive 1 is positioned at the inside of housing 11, it is provided with the spindle motor 3 that makes indicator 12 rotation, reads information and to the magnetic head 13 and the actuating unit 14 of indicator 12 write information from indicator 12, and this actuating unit 14 makes magnetic head 13 move to select location place on the indicator 12.
The structure outline of spindle motor
As shown in Figure 2, spindle motor 3 is provided with, rotor hub 21, and it has load-bearing surface, and described indicator 12 is stated from this load-bearing surface; Be installed in the ring-shaped rotor magnets 32 on the rotor hub 21; Bearing 27 as base element; The stator of forming by a plurality of coils 31; And hydrodynamic pressure bearing 2, it is with respect to bearing 27 and stator 31 support rotor hub 21 and rotor magnet 32 rotatably.Stator 31 radially relatively is fixed on the bearing 27 with the inner circumferential surface of rotor magnet 32.Hydrodynamic pressure bearing 2 is installed in the bearing 27 integratedly.Should be noted that this bearing 27 can be integrally formed with housing 11, so that constitute base plate (base element).
The structure of hydrodynamic pressure bearing
Hydrodynamic pressure bearing 2 is provided with: be fixed on the axle 24 in the rotor hub 21; Be assemblied in the sleeve 22 on the axle 24; On the radial outside of sleeve 22, be the bear box 23 of cup-shaped substantially, and sleeve 22 insert wherein; And seal cartridge 26, it is installed in the position of the upside of sleeve 22.Rotor hub 21 and axle 24 have constituted rotor unit; And bear box 23, sleeve 22 and seal cartridge 26 have constituted stator unit.
Between axle 24 and sleeve 22, radially extend and lubricating fluid 35 is filled and maintained in axially extended gap.For example ester group or poly-(alpha-olefin) base oil are used as lubricating fluid 35.It should be noted, for lubricating fluid 35, also can adopt according to described lubricating fluid how to show and suitably select and adjust oil or other fluid.
The radially relatively spaced apart several microns of at least a portion of the external peripheral surface of axle 24 and the inner circumferential surface of sleeve 22 have wherein just formed radial dynamic pressure bearing 42.The end flangeization of axle 24 contiguous its downsides form the flange 25 that extends radially outwardly, and the lower surface of the bottom surface of the upper surface of flange 25 and lower surface and bear box 23 and sleeve 22 is axially relative, has wherein constituted thrust dynamic pressure bearing 43a and 43b respectively.
Described radial dynamic pressure bearing 42 and thrust dynamic pressure bearing 43 be under pressure with respect to sleeve 22 back shaft 24 and rotor hub 21 rotatably, and this pressure is that the current difference owing to the lubricating fluid 35 in the gap that remains between rotating shaft 24 and the sleeve 22 relative with this produces.And, on the inner circumferential surface of the sleeve 22 that constitutes journal bearing, be formed with lambdoid dynamic pressure groove (not shown), when axle 24 rotates with respect to sleeve 22, this groove applies pump action along such direction on lubricating fluid 35, that is, make the direction of this fluid collection in the axial tension portion (axial stretch) of radial dynamic pressure bearing 42.
Now Fig. 5 is described, this figure is the partial enlarged view of Fig. 2, has shown the key feature of seal cartridge 26 and axle 24.Spacing between the inner circumferential surface of axle 24 external peripheral surface and seal cartridge 26 is along with at interval towards last and open.Here, bearing 2 is arranged in the lower end of seal cartridge 26, and this is approximately 20 μ m at interval, and at the upper end of seal cartridge 26, this is approximately 300 μ m at interval.In this interval, between lubricating fluid 35 and outside atmosphere, form boundary face 44, it has constituted capillary seal 41.The capillary size on the interface that acts between lubricating fluid 35 and the outside atmosphere is depended in the position of boundary face 44; This surface tension is big more, and boundary face 44 just keeps stablely more.The size of the gap size of capillary seal 41 and the angle of wetting θ 1 between the surface of lubricating fluid 35 and formation capillary seal part 41 greatly influences capillary intensity.
Manufacture method
The method of making hydrodynamic pressure bearing 2 is as follows.
Make and clean
That is, manufacturing/formation rotor hub 21, sleeve 22, bear box 23, axle 24, seal cartridge 26 and base element 27 at first respectively.Afterwards, clean these elements.Use pure water, solvent, acidity/alkaline solution, surfactant to wait and clean.
Here, can clean by irradiation of ultraviolet wire harness or plasma (for example, ultraviolet light ozone).Using ultraviolet ray or plasma to clean can remove efficiently owing to organic residual dust and dirt that causes.And, can be used in combination based on liquid or based on the cleaning process of shining.
Ultraviolet wire harness irradiation sleeve external peripheral surface
Below, use the ultraviolet wire harness to shine the external peripheral surface of sleeve 22.The ultraviolet wire harness has special wavelength, is 365nm when for example using mercury lamp, and under the situation of using low pressure mercury lamp, wavelength is 185nm, 254nm; Under the situation that adopts bimolecular excitation state uviol lamp (excimer lamp), wavelength is 126nm, 146nm, 172nm, 222nm.In order to make irradiation, can as required light be filtered and beam splitting, so that special single wavelength component to be provided for the only ultraviolet ray in specific bandwidth.Irradiation time is approximately 20 seconds.
Subsequently, hold the external peripheral surface of housing 23 with ultraviolet wire harness irradiation axis.Ultraviolet ray irradiation with on the external peripheral surface of sleeve 22, carry out identical.Irradiation time is approximately 20 seconds.
Ultraviolet wire harness irradiation seal cartridge
Below, with the upper surface and the inner circumferential surface of ultraviolet wire harness irradiation seal cartridge 26.This ultraviolet wire harness is identical with the external peripheral surface use of shining sleeve 22, and from same light source output.Irradiation time is approximately 20 seconds, and intergal dose is set at 35kJ/m
2The upper surface of seal cartridge 26 is as stator side oleophobic agent coating surface 46a, and the inner circumferential surface of seal cartridge 26 is as the stator side sealing surfaces 45a that constitutes capillary seal 41.
It should be noted that these ultraviolet ray irradiation operations can obtain effective surface clean.Use ultraviolet ray or plasma to clean, can efficiently remove owing to organic residual dust and dirt that causes.
Assembling
Below, axle 24 is inserted in the sleeve 22, then sleeve-shaft assembly is inserted in the bear box 23.The inner circumferential surface of the external peripheral surface of sleeve 22 and bear box 23 is fixed together adhering to each otherly.By being press-fitted sleeve 22 is inserted in the bear box 23, this has the danger that produces distortion in sleeve 22, and bonding is fixing sleeve 22 is limited in the bear box 23, and can not make sleeve 22 distortion.And owing to used the external peripheral surface of ultraviolet ray irradiation sleeve 22 before assembling, therefore described binding agent 34 is bonded on the sleeve surface easily, thereby has improved the bonding strength between sleeve 22 and the bear box 23 significantly.
Subsequently, seal cartridge 26 is inserted in the bear box 23, and adhesively be fixed on the inner circumferential surface of housing.The part that the inner circumferential surface with seal cartridge 26 of axle 24 is relative is used as the rotor-side sealing surfaces 45b that constitutes capillary seal 41.
Apply oleophobic agent 33
In the next stage of the manufacture process of bearing 2, on the rotor-side oleophobic agent coating surface 46b of the upside of the sealing surfaces 45b that is positioned at axle 24, apply oleophobic agent 33.The special distribution device that use is used for this purpose applies oleophobic agent 33.In the oleophobic agent coating surface 46b of axle, be formed for the groove that mark oleophobic agent 33 applies the position.
Inject lubricating fluid 35
Next, by the gap between 24, lubricating fluid 35 is infused in the gap between radial dynamic pressure bearing 42 and the thrust dynamic pressure bearing 43 at seal cartridge 26 and axle.When load module is in vacuum following time, lubricating fluid 35 flows to, thereby hides the gap between (conceal) bear box 26 and the axle 24; Then load module is returned to gradually near atmospheric pressure, thus make lubricating fluid 35 enter and remain on formation radially with the gap of thrust dynamic pressure bearing in.The injection rate of lubricating fluid 35 is to make the inside in described gap will be full of this lubricating fluid 35.
Subsequently, by measuring the height of the boundary face 44 between lubricating fluid 35 and outside atmosphere, check whether lubricating fluid 35 is an amount of.When lubricating fluid 35 is an amount of, can be between stator side sealing surfaces 45a and rotor-side sealing surfaces 45b in the position of formation boundary face 44.
By said method, just finished by sleeve 22, bear box 23, axle 24, seal cartridge 26 and remain on radial fluid hydrodynamic bearing 45 and thrust hydrodynamic pressure bearing 43 in the hydrodynamic pressure bearing 2 formed of lubricating fluid 35.
Rotor hub is installed
By rotor hub 21 being press fit over the upper end of axle 24, just the rotor hub 21 that rotor magnet 32 is installed on it is installed on the axle 24.As a kind of method that improves bonding strength, and, can use binding agent that described hub is fixed on the described axle in order to prevent deformed element.
Bearing unit is fixed on the pedestal
Next, with on bear box 23 bearing 27 that stator 31 has been installed adhesively fixed thereon.In bearing 27, be formed with the basic installing hole 27a identical of structure with the external peripheral surface of bear box 23.Under the intervention of binding agent 34, the external peripheral surface of bear box 23 is pressed close to (snug) along the inner circumferential surface of installing hole 27a, thereby this housing circumferential surface adhesively is fixed on this inner circumferential surface.Owing to before being fixed on housing in the bearing, used ultraviolet ray to shine the external peripheral surface of bear box 23, therefore binding agent 34 adheres on the surface of shell easily, thereby has improved significantly in the external peripheral surface of bear box 23 and the bonding strength between the installing hole 27a in the bearing 27.
Make spindle motor 3 by these steps.
Embodiment effect/result
The variation of the angle of wetting in the capillary seal part 41 of the hydrodynamic pressure bearing 2 among first embodiment that method constructed in accordance makes will be given in below.When using ester group oil as lubricating fluid 35, its angle of wetting with respect to seal cartridge 26 before the ultraviolet ray irradiation is about 60 °.After use had the ultraviolet wire harness irradiation 20 seconds of dominant wavelength of 185nm, angle of wetting became 20 °～30 °.Evidently, angle of wetting significantly reduces.And even after ultraviolet ray irradiation seven days, it is constant substantially that this angle of wetting still keeps.
Carry out in making hydrodynamic pressure bearing before the ultraviolet ray irradiation operation, oleophobic agent 33 very easily comes off, thereby must discern the manufacturing operation of peeling off and applying once more oleophobic agent after the coating.On the contrary, therefore oleophobic agent 33 in the inspection after coating, does not almost have article need apply oleophobic agent once more for fabulous by the adhesiveness of 20 seconds the sealing surfaces of ultraviolet wire harness irradiation with 185nm dominant wavelength.Therefore, make and in fact not need the work that applies once more.
The diameter of bear box 23 is approximately 10mm, is about 5mm and cooperate the length of assembling between the installing hole in bear box 23 and the bearing 27.Up to the present, used propenyl anaerobism binding agent, UV cured binding agent and epoxy radicals thermo-hardening binder as binding agent 34.Carry out in making hydrodynamic pressure bearing before the ultraviolet irradiation operation, the bear box 23 required power of pulling out hydrodynamic pressure bearing 2 from bearing 27 are 30-100kgf.On the contrary, when boning operation under the same conditions, after ultraviolet wire harness that use has 185nm dominant wavelength was to the bonding surface irradiation of described housing 20 seconds, the bear box 23 required power of pulling out hydrodynamic pressure bearing 2 from bearing 27 rose to 60-120kgf significantly.In addition, because binding agent is bonded on the element surface easily, therefore described binding agent evenly distributes along mating surface.Therefore, between binding agent and element, be difficult for to form breach, thereby can prevent more that pollutant from invading the inside of indicator driver from the outside through these breaches.
Second embodiment
Use spindle motor 103 is as shown in Figure 3 replaced the spindle motor 3 among first embodiment.Indicator 12 is by rotor hub 121 carryings and the rotation of spindle motor 103.
With with first embodiment in identical mode, this spindle motor 103 is made up of hydrodynamic pressure bearing 102, stator 32 and rotor magnet 132.Equally, in spindle motor 103, the base plate 127 of a part of housing 11 that is configured for indicator driver 1 is as base element.
This hydrodynamic pressure bearing 102 comprises: columnar shaft 124, and it is installed in the pivot part of rotor hub 121; Sleeve 122, it has the radially relative inner circumferential surface of external peripheral surface with axle 124; And rotor hub 121, it has and the axial relative downside surface in the upper surface of sleeve 122.Axle 124 is made by the martensitic stain less steel that quenches, and sleeve 122 is made of free cutting stainless steel.Cylindrical wall shape member 126 around sleeve 122 is installed on the rotor hub 121.The inner circumferential surface 126a of cylindrical wall shape member 126 is radially relative with the external peripheral surface of sleeve 122.Rotor hub 121, axle 124 and rotor magnet 132 have constituted the rotor unit of spindle motor 103.Simultaneously, sleeve 122, stator 131 and base plate 127 have formed the stator unit of spindle motor 103.
Make at least a portion of the diametric clearance between the inner circumferential surface of axle 124 external peripheral surface and sleeve 122 be measured as several microns.Equally, make the part of the end play between the downside surface of the upper surface of sleeve 122 and rotor hub 121 be measured as several microns to about 20 microns.Lubricating fluid 35 is filled and remained in these gaps: in diametric clearance, lubricating fluid 135 is held to form radial dynamic pressure bearing 142; And in end play, lubricating fluid 35 is held to form thrust dynamic pressure bearing 143.In addition, the inner circumferential surface 126a of cylindrical wall shape member 126 is rotor-side sealing surfaces 145a.Along the external peripheral surface of sleeve 122, the part relative with rotor-side sealing surfaces 145a is stator side sealing surfaces 145b.Diametric clearance between rotor-side sealing surfaces 145a and the stator side sealing surfaces 145b is opened to the lower end from the upper end in this gap.This gap has constituted capillary seal part 141.In the gap that constitutes capillary seal part 141, be formed on the boundary face 144 between lubricating fluid 135 and the outside atmosphere.
The method of making above-mentioned hydrodynamic pressure bearing is as follows.
That is, the same with situation among first embodiment, each element of manufacturing/formation cleans each element then.
Then, on the external peripheral surface of sleeve 122, carry out the Surface Treatment with Plasma process.In the present embodiment, use ozone clean as the Surface Treatment with Plasma process.By using the ultraviolet wire harness to make the oxygen ozonize and carrying out ozone clean with the external peripheral surface that the ozone-plasma that produces is shone sleeve 122.Should be understood that the grease and the removing of other organic residue that can in this surface treatment process, will adhere on the element surface.
Here, can on the inner circumferential surface 126a of the cylindrical wall shape member 126 on the rotor hub 121 and in base plate 127, the vicinity of installing hole carry out the Surface Treatment with Plasma process.
Next, axle 124 is installed in the rotor hub 121.Then, sleeve 122 is assemblied on the axle 124, and cylindrical wall shape member 126 is fixed on the bottom side surface of rotor hub 121.Therefore, cylindrical wall shape member 126 is used for locked rotor hub 121, prevents that it from coming out from sleeve 122.Then, come the lower end (bottom) of cover sleeve 122 with end plate 125.Therefore, seal cavity is made in the inside of sleeve 122.
Subsequently, along the excircle side of sleeve 122,, apply oleophobic agent 33 around this circumference in the zone of the downside that is arranged in stator side sealing surfaces 145b.The external peripheral surface that is coated with oleophobic agent 33 of sleeve 122 is as stator side oleophobic agent coating surface 146a.Then, also apply oleophobic agent 33 in the bottom of the inner circumferential surface 126a of cylindrical wall shape member 126.The inner circumferential surface 126a that is coated with oleophobic agent 33 of cylindrical wall shape member 126 is as rotor-side oleophobic agent coating surface 146b.Then, continue this bearing manufacture method by hydrodynamic pressure bearing 102 being heated to about 100 ℃, so that oleophobic agent 33 adheres on the oleophobic agent coating surface 146.Effect about Surface Treatment with Plasma it should be noted, even the bearing heating is reached 120 ℃, final effect is weakened.
At this moment, lubricating fluid 35 passes through capillary seal part 141, thereby makes the gap of radial dynamic pressure bearing 142 and thrust dynamic pressure bearing 143 be filled with this fluid.Under vacuum environment, along with sleeve 122 upwards and rotor hub 121 is downward, lubricating fluid 35 flows in capillary seal part 141 openings.The volume of lubricating fluid is such amount, promptly will form fluid-atmospheric boundary face according to this cubical content in the limit that is limited by capillary seal part 141.After bearing was filled with lubricating fluid 35, whether inspection/matched edge interface was formed on the tram.Afterwards, the bearing environment is pressurizeed reaching atmospheric pressure gradually again, thereby make the gap be full of lubricating fluid 35.Here, lubricating fluid 35 stably remains in the bearing clearance by acting on the capillary force in the gap.
Then, hydrodynamic pressure bearing 102 adhesively is fixed on the base plate 127.Form a circular mounting hole in base plate 127, the external peripheral surface of this installing hole and sleeve 122 closely cooperates.Binding agent 34 is coated on the inner circumferential surface of this installing hole, then sleeve 122 is inserted wherein.
Stator 131 is installed on the base plate 127 in advance, and rotor magnet 132 is installed on the rotor hub 121 in advance.In aforesaid mode, just finished spindle motor 103.
Confirmablely be, basic identical when carrying out ultraviolet ray when bearing element and shine to the influence of the angle of wetting of the lubricating fluid in the capillary seal part 141 35 in the present embodiment, in this ultraviolet ray is shone, used ultraviolet wire harness and identical lubricant.
The same effect that also can determine to make the deposit of oleophobic agent 35 to be easy to peel off.Especially, after applying oleophobic agent, bearing added and pine for, use rag will carry out surface-treated oleophobic agent coating surface 146b scouring tens times, yet but do not have oleophobic agent to be bonded on the rag with plasma with the power of 100gf.Can know that from these checkings by applying oleophobic agent 33 on based on the stator side oleophobic agent coating surface 146a of isoionic surface treatment process, the adhesiveness of oleophobic agent 33 is greatly improved.
And, also having improved the bonding strength between base plate 127 and the sleeve 122, the twice at least that is in a ratio of its bonding strength with the surface of wherein not carrying out plasma treatment is many.Therefore, improved the durability of anti-vibration or other impact of assembly significantly.
The 3rd embodiment
Below with reference to Fig. 4, this figure is the view that is illustrated in spindle motor 203 and hydrodynamic pressure bearing 202 in further embodiment of this invention.
Fig. 4 demonstrates hydrodynamic pressure bearing 202, and its axis 224 is fixed in the bearing 227.This hydrodynamic pressure bearing 202 comprises: sleeve 222, and it is installed in the rotor hub 221 of spindle motor 203; Axle 224, it is inserted in the sleeve 222; And flange 225, it is installed on the upper part of axle 224.Lubricating fluid 35 is filled and is maintained in gap between sleeve 222 and the axle 224.Radial dynamic pressure bearing 242 is formed between the inner circumferential surface of axle 224 external peripheral surface and sleeve 222.And thrust dynamic pressure bearing 243a and 243b are formed between part axially relative with this top/bottom surface of the top of flange 225 and lower surface and sleeve 222.
In this hydrodynamic pressure bearing 202, the Surface Treatment with Plasma process is stood in the lower surface of the external peripheral surface of sleeve 222 and sleeve 222.Should be understood that also and can shine these zones with the ultraviolet wire harness.This surface treatment step can be before or after assembling hydrodynamic pressure bearing 202.
Be coated with oleophobic agent 33 in the lower surface of sleeve 222, afterwards this surface heated so that obtain rotor-side oleophobic agent coating surface 246a.
Then, in described gap, inject lubricating fluid 35, form radial dynamic pressure bearing 242 and thrust dynamic pressure bearing 243 by this gap.The method for implanting of lubricating fluid 35 is identical with the method for first embodiment.
The external peripheral surface of sleeve 222 inserts among the installing hole 227a that is located in the bearing 227 along with the intervention of bonding agent 34.
The hydrodynamic pressure bearing 202 of the 3rd embodiment has long service life owing to it stably keeps lubricating fluid 35; Wherein, suppressed lubricating fluid 35 owing to percussion is leaked.In addition, also in spindle motor 203, the bonding strength between bearing 227 and the hydrodynamic pressure bearing 202 is stronger, and this ability that makes motor withstand shocks strengthens.
Should be understood that the present invention has more than is limited to the scope that proposes among the described embodiment, and this is because can carry out various modifications in the scope that does not break away from essence of the present invention.For example, no matter can both obtain essentially identical effect by carrying out any surface treatment (shining the surface treatment process that carries out, perhaps Surface Treatment with Plasma process) by the ultraviolet wire harness.Comprise various cleaning devices based on isoionic surface treatment process, for example be used for the cleaning device that ion cleaning, ozone clean or UV ozone are cleaned, and the irradiation unit by charged particle beam and high energy radio frequency irradiation.
In addition, adopted the hydrodynamic pressure bearing of various structures up to now, the present invention is applicable to the hydrodynamic pressure bearing that is provided with capillary seal.Equally, by bonding agent and the spindle motor of combination, and the form that need not consider the form of motor or bearing how applicable to hydrodynamic pressure bearing wherein and other element in the present invention.
Other modification comprises, can be according to using and design material and the material that changes types of binder, oleophobic agent type, lubricant type and constitute the element of hydrodynamic pressure bearing and spindle motor.Equally, indicator driver of the present invention and be not necessarily limited to hard disk drive; The present invention can be applicable to various types of indicator drivers, for example removable disk drive, CD drive and magneto optical driver.And the manufacture method of hydrodynamic pressure bearing of the present invention can be used to make such bearing, and this bearing is used for the motor with high speed rotation and essential high running accuracy, for example is used for the motor and the fan electromotor in multiaspect border.
Claims (18)
1. the manufacture method of a hydrodynamic pressure bearing, this hydrodynamic pressure bearing is provided with: stator unit; Can be with respect to this stator unit rotor rotated unit; The gap that constitutes by the surface of the surface of this stator unit and the rotor unit relative with this stator unit surface; Dynamic pressure bearing mechanism, it is made up of the lubricating fluid that is formed on the lip-deep stator side bearing surface of the stator unit that constitutes described gap, is formed on the lip-deep rotor-side bearing surface of the rotor unit that constitutes described gap and fills a microgap, and it is relative with described stator side bearing surface that described rotor-side bearing surface crosses described microgap; And the capillary seal part, it constitutes the part in described gap and communicates with described microgap, and the boundary face that forms between lubricating fluid and outside atmosphere is arranged in this capillary seal part; The manufacture method of described hydrodynamic pressure bearing comprises:
First step at least one surface, comprises at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines in described stator unit surface that constitutes described capillary seal part and rotor unit surface; And
Second step after described first step, is injected a certain amount of lubricating fluid in described microgap, by lubricating fluid described boundary face of formation in described capillary seal part of this quantity.
2. the manufacture method of hydrodynamic pressure bearing as claimed in claim 1 is characterized in that, the injection of lubricating fluid partly realizes by described capillary seal in described second step.
3. the manufacture method of hydrodynamic pressure bearing as claimed in claim 1 is characterized in that, constitutes the stator unit surface of capillary seal part of described hydrodynamic pressure bearing and at least one surface in the rotor unit surface and is formed by resin material.
4. the manufacture method of hydrodynamic pressure bearing as claimed in claim 1 is characterized in that:
At least one that constitutes in the element of the stator unit of described hydrodynamic pressure bearing and rotor unit is the hardware that is formed by metal; And
In described first step, described hardware is carried out surface clean by comprising plasma irradiation and the ultraviolet wire harness surface treatment process one of in shining.
5. the manufacture method of hydrodynamic pressure bearing as claimed in claim 1, it is characterized in that, also comprise third step, this step and described first step are simultaneously or do not carry out simultaneously and before described second step, in this step, on at least one surface in described stator unit surface that constitutes described microgap and rotor unit surface, comprise at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines.
6. the manufacture method of a hydrodynamic pressure bearing, this hydrodynamic pressure bearing is provided with: stator unit; The rotor unit that can rotate freely with respect to this stator unit; The gap that constitutes by the surface of the surface of this stator unit and the rotor unit relative with this stator unit surface; Dynamic pressure bearing mechanism, it is made up of the lubricating fluid that is formed at the lip-deep stator side bearing surface of the stator unit that constitutes described gap, constitutes the lip-deep rotor-side bearing surface of rotor unit in described gap and fills a microgap, and it is relative with described stator side bearing surface that described rotor-side bearing surface crosses described microgap; The capillary seal part, it constitutes a described gap part and communicates with described microgap, and the boundary face that forms between described lubricating fluid and outside atmosphere is arranged in this capillary seal part; And the surface, arid region that is positioned at described capillary seal near surface, it is formed at the outside atmosphere side of surperficial at described stator unit respectively and the lip-deep described boundary face of rotor unit; The manufacture method of described hydrodynamic pressure bearing comprises:
First step comprises at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines on surface, described arid region;
Second step after first step, is coated in oleophobic agent on the surface, described arid region; And
Third step after second step, injects a certain amount of lubricating fluid in described microgap, by lubricating fluid described boundary face of formation in described capillary seal part of this quantity.
7. the manufacture method of hydrodynamic pressure bearing as claimed in claim 6, it is characterized in that, also comprise the 4th step, this step and described first step are simultaneously or do not carry out simultaneously and before described third step, in this step, on constituting described capillary seal described stator unit surface and at least one surface in the rotor unit surface partly, comprise at least a surface treatment process in one group of surface treatment process that plasma shines and ultraviolet ray is shone.
8. the manufacture method of hydrodynamic pressure bearing as claimed in claim 6 is characterized in that, constitutes the described stator unit surface on surface, arid region described in the hydrodynamic pressure bearing and at least one surface in the rotor unit surface and is formed by resin material.
9. the manufacture method of hydrodynamic pressure bearing as claimed in claim 6 is characterized in that:
At least one that constitutes in the element of the stator unit of described hydrodynamic pressure bearing and rotor unit is the hardware that is formed by metal; And
In described first step, described hardware is carried out surface clean by comprising plasma irradiation and the ultraviolet wire harness surface treatment process one of in shining.
10. the manufacture method of hydrodynamic pressure bearing as claimed in claim 6, it is characterized in that, also comprise the 5th step, this step and described first step are simultaneously or do not carry out simultaneously and before described third step, in this step, on at least one surface in described stator unit surface that constitutes described microgap and rotor unit surface, comprise at least a surface treatment process in one group of surface treatment process that plasma shines and the ultraviolet wire harness shines.
11. the manufacture method of a spindle motor, this spindle motor is provided with: stator unit; The rotor unit that freely rotates with respect to this stator unit; The gap that constitutes by the surface of the surface of this stator unit and the rotor unit relative with this stator unit surface; And dynamic pressure bearing mechanism, it is by being formed on the lip-deep stator side bearing surface of the stator unit that constitutes described gap, forming at the lip-deep rotor-side bearing surface of the rotor unit that constitutes described gap and the lubricating fluid of filling a microgap, and it is relative with the stator side bearing surface that described rotor-side bearing surface crosses described microgap; Wherein, described stator unit, rotor unit, gap and dynamic pressure bearing mechanism have constituted hydrodynamic pressure bearing; And be provided with base element with bonding surface, and described stator unit adhesively is fixed in the described base element along this bonding surface, and wherein said stator unit external peripheral surface is relative with this bonding surface; The manufacture method of described spindle motor comprises:
First step, on at least one surface in the external peripheral surface of the bonding surface of described base element and the stator unit relative, comprise at least a surface treatment process in one group of surface treatment process of plasma irradiation and ultraviolet ray irradiation with this bonding surface;
Second step, after described first step, coated with adhesive at least one surface in the external peripheral surface of the bonding surface of described base element and the stator unit relative with this bonding surface; And
Third step after described second step, adheres to the external peripheral surface of described stator unit on the bonding surface of described base element, so that described stator unit is fixed in the described base element.
12. the manufacture method of spindle motor as claimed in claim 11 is characterized in that, at least one surface in the external peripheral surface of described stator unit and the bonding surface of described base element is formed by resin material.
13. the manufacture method of spindle motor as claimed in claim 11 is characterized in that:
Constitute at least one the hardware in the spindle motor element of bonding surface of the external peripheral surface of described stator unit and described base element for forming by metal; And
In described first step, described hardware is carried out surface clean by comprising plasma irradiation and the ultraviolet wire harness surface treatment process one of in shining.
14. a spindle motor comprises:
Hydrodynamic pressure bearing, its manufacture method by hydrodynamic pressure bearing as claimed in claim 1 is made;
Be installed in the rotor hub on the described rotor unit;
Be fixed on the rotor magnet on the described rotor unit;
Be fixed on the base element on the described stator unit; And
Stator, it is fixed on described stator unit or the described base element, and radially relative with described rotor magnet; Wherein,
Described spindle motor makes described rotor unit rotate with respect to described stator unit.
15. a spindle motor comprises:
Hydrodynamic pressure bearing, its manufacture method by hydrodynamic pressure bearing as claimed in claim 6 is made;
Be installed in the rotor hub on the described rotor unit;
Be fixed on the rotor magnet on the described rotor unit;
Be fixed on the base element on the described stator unit; And
Stator, it is fixed on described stator unit or the described base element, and radially relative with described rotor magnet; Wherein,
Described spindle motor makes described rotor unit rotate with respect to described stator unit.
16. an indicator driver comprises:
Spindle motor, its manufacture method by spindle motor as claimed in claim 11 is made;
Magnetic head is used for reading information from the disc-shape recoding medium by described spindle motor rotation;
Housing is used to hold described spindle motor and described magnetic head.
17. an indicator driver comprises:
Spindle motor as claimed in claim 15;
Magnetic head is used for reading information from the disc-shape recoding medium by described spindle motor rotation;
Housing is used to hold described spindle motor and described magnetic head.
18. an indicator driver comprises:
Spindle motor as claimed in claim 14;
Magnetic head is used for reading information from the disc-shape recoding medium by described spindle motor rotation;
Housing is used to hold described spindle motor and described magnetic head.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004163446 | 2004-06-01 | ||
| JP2004163446A JP4369303B2 (en) | 2004-06-01 | 2004-06-01 | DYNAMIC PRESSURE BEARING DEVICE, MANUFACTURING METHOD THEREOF, MOTOR AND DISK DRIVE DEVICE |
| JP2004163901 | 2004-06-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1704202A CN1704202A (en) | 2005-12-07 |
| CN100406194C true CN100406194C (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100730537A Expired - Fee Related CN100406194C (en) | 2004-06-01 | 2005-05-27 | Methods of manufacturing fluid-dynamic-pressure bearing and spindle motor incorporating the bearing, and spindle motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4369303B2 (en) |
| CN (1) | CN100406194C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100899319B1 (en) * | 2006-09-07 | 2009-05-27 | 알파나 테크놀로지 가부시키가이샤 | Motor and disk driving device having the same |
| JP2009148132A (en) * | 2007-12-18 | 2009-07-02 | Nippon Densan Corp | Method for forming oil repellency film, method for manufacturing motor, and motor |
| JP2009166065A (en) * | 2008-01-15 | 2009-07-30 | Nippon Densan Corp | Laser beam processing method, bearing device, spindle motor, and disk drive unit |
| JP5176611B2 (en) * | 2008-03-10 | 2013-04-03 | Ｔｄｋ株式会社 | Magnet roll manufacturing method and shaft cleaning device |
| JP2010038356A (en) * | 2008-07-10 | 2010-02-18 | Ntn Corp | Mechanical component and manufacturing method for the same |
| JP5603092B2 (en) * | 2010-02-08 | 2014-10-08 | サムスン電機ジャパンアドバンスドテクノロジー株式会社 | Hard disk drive and method for producing hard disk drive |
| KR20120016935A (en) * | 2010-08-17 | 2012-02-27 | 삼성전기주식회사 | Hydrodynamic bearing assembly and motor including the same |
| US9368149B2 (en) * | 2014-02-18 | 2016-06-14 | Nidec Corporation | Disk drive spindle motor with adhesive connection between shaft flange and bearing cup |
| JP6999279B2 (en) * | 2017-03-07 | 2022-01-18 | セイコーインスツル株式会社 | Bearing cleaning device |
| US10971193B2 (en) * | 2017-08-08 | 2021-04-06 | Sony Semiconductor Solutions Corporation | Base unit and optical disk device |
| CN109048346B (en) * | 2018-09-21 | 2023-10-03 | 浙江硕和机器人科技有限公司 | Rotor finish machining production line |
| CN113883166A (en) * | 2021-09-30 | 2022-01-04 | 浙江工业大学 | Method for improving distribution uniformity of oil film pressure field of hydrostatic bearing |
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| WO1997023736A1 (en) * | 1995-12-22 | 1997-07-03 | Philips Electronics N.V. | Dynamic groove bearing with a lubricant barrier |
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| US20010006565A1 (en) * | 1999-12-27 | 2001-07-05 | Masato Gomyo | Thrust dynamic pressure bearing apparatus and method for manufacturing the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2005344785A (en) | 2005-12-15 |
| CN1704202A (en) | 2005-12-07 |
| JP4369303B2 (en) | 2009-11-18 |
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