KR20140077266A - Hydrodynamic Bearing Module and Spindle Motor having the same - Google Patents

Hydrodynamic Bearing Module and Spindle Motor having the same Download PDF

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Publication number
KR20140077266A
KR20140077266A KR1020120145590A KR20120145590A KR20140077266A KR 20140077266 A KR20140077266 A KR 20140077266A KR 1020120145590 A KR1020120145590 A KR 1020120145590A KR 20120145590 A KR20120145590 A KR 20120145590A KR 20140077266 A KR20140077266 A KR 20140077266A
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KR
South Korea
Prior art keywords
sleeve
shaft
oil circulation
circulation hole
dynamic pressure
Prior art date
Application number
KR1020120145590A
Other languages
Korean (ko)
Inventor
박영하
Original Assignee
삼성전기주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020120145590A priority Critical patent/KR20140077266A/en
Publication of KR20140077266A publication Critical patent/KR20140077266A/en

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    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2036—Motors characterized by fluid-dynamic bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings

Abstract

The hydrodynamic pressure bearing module according to the present invention comprises a shaft and a sleeve rotatably supported by the shaft, wherein oil is filled in a minute gap between the shaft and the sleeve to form a fluid dynamic pressure bearing portion, A first oil circulation hole passing through an inner diameter and an outer diameter of the sleeve in the radial direction of the shaft is formed and a second oil circulation hole is formed in the axial direction of the shaft to connect the upper surface and the lower surface of the sleeve, The hole and the second oil circulation hole are communicated and intersected.

Description

[0001] The present invention relates to a hydrodynamic bearing module and a spindle motor including the hydrodynamic bearing module,

The present invention relates to a fluid dynamic pressure bearing module and a spindle motor including the fluid dynamic pressure bearing module.

2. Description of the Related Art Generally, a spindle motor used as a drive device for a recording disk, such as a hard disk, stores a lubricant such as oil between a rotating portion and a fixed portion at the time of rotation of a motor, It is widely used.

More specifically, a spindle motor equipped with a fluid dynamic pressure bearing that maintains axial rigidity of the shaft only by the moving pressure of the lubricating oil by centrifugal force is based on the thrust force. Therefore, there is no metal friction, And it is mainly applied to high-end optical disc apparatuses and magnetic disc apparatuses, since the high-speed rotation of the rotating object is smoother than the motor having the ball bearing.

The spindle motor according to the prior art, which includes the prior art documents, has a problem in that the oil injected for forming the hydrodynamic pressure bearing is evaporated to the outside and the motor life is shortened Unstable motor drive is caused, the bearing span length is limited, and oil circulation is not smooth.

Patent Document 1: Korean Patent No. 10-0200598

According to the present invention, a first oil circulation hole is formed in a radial direction of the shaft so as to penetrate from an outer diameter to an inner diameter of the sleeve, a second oil circulation hole is formed to connect the upper surface and the lower surface of the sleeve in the axial direction of the shaft, The first oil circulation hole and the second oil circulation hole are communicated with each other to cross each other, and oil is circulated in the upper and lower portions of the sleeve, so that two oil circulation channels are ensured, A fluid dynamic pressure bearing module and a spindle motor including the fluid dynamic pressure bearing module capable of increasing the life of the motor by increasing the amount of oil charged can be obtained.

A hydrodynamic pressure bearing module according to an embodiment of the present invention includes a shaft and a sleeve rotatably supported by the shaft, oil is filled in a minute gap between the shaft and the sleeve to form a fluid dynamic pressure bearing portion, Wherein the sleeve has a first oil circulation hole passing through an inner diameter and an outer diameter of the sleeve in a radial direction of the shaft and a second oil circulation hole connecting an upper surface and a lower surface of the sleeve in an axial direction of the shaft, The first oil circulation hole and the second oil circulation hole are communicated and intersected.

Further, the sleeve of the hydrodynamic pressure bearing module according to an embodiment of the present invention is characterized in that a radial dynamic pressure generating groove is formed on an inner circumferential surface opposed to the shaft, and the radial dynamic pressure generating groove is formed on the shaft Respectively, in the upper and lower portions of the sleeve.

The radial dynamic pressure generating grooves of the hydrodynamic pressure bearing module according to an embodiment of the present invention are formed such that the grooves adjacent to the first oil circulating holes are formed longer than the grooves adjacent to the upper and lower ends of the sleeve with respect to the axial direction of the shaft .

Further, the hole formed in the sleeve outer diameter portion by the first oil circulation hole of the fluid dynamic pressure bearing module according to an embodiment of the present invention may be covered with any one of a sealing member, a bonding agent, and soldering.

The hydrodynamic pressure bearing module according to an embodiment of the present invention further includes a thrust plate coupled to an upper portion of the shaft and positioned at an upper portion of the sleeve with respect to an axial direction of the shaft and a thrust plate coupled to a lower portion of the shaft, An upper sealing portion is formed between the sleeve and the thrust plate with respect to a radial direction of the shaft, and a lower sealing portion is formed between the holder and the sleeve.

A spindle motor according to an embodiment of the present invention including a hydrodynamic pressure bearing module according to the present invention includes a sleeve-integrated hub, a rotating part including a magnet coupled to an inner circumferential surface of the sleeve-integrated hub, a shaft for rotatably supporting the sleeve, A thrust plate coupled to an upper portion of the shaft, a holder coupled to a lower portion of the shaft, a base coupled to the holder, and an armature coupled to an outer circumferential portion of the base to face the magnet, Wherein a fluid dynamic pressure bearing portion is formed between the rotary portion and the fixed portion by injecting oil as a working fluid, and the sleeve integral hub is formed with an oil circulation hole for circulation of the oil, and the oil circulation hole is formed in the radial direction of the shaft 1 oil circulation hole and a second oil circulation hole formed in the axial direction of the shaft.

Further, the sleeve-integrated hub of the spindle motor according to an embodiment of the present invention including the fluid dynamic pressure bearing module according to the present invention includes a sleeve portion opposed to the shaft, a disk portion extending radially outward from the sleeve portion, And a side wall portion extending downward in the axial direction of the shaft at the radially outer end of the disk portion.

In the spindle motor according to an embodiment of the present invention including the fluid dynamic pressure bearing module according to the present invention, the sleeve portion of the sleeve-integrated hub has a radial dynamic pressure generating groove formed on an inner circumferential surface opposed to the shaft, Are formed at the upper and lower portions of the sleeve-integrated hub, respectively, in the axial direction of the shaft with respect to the first oil circulation hole.

Further, the radial dynamic pressure generating grooves of the spindle motor according to an embodiment including the hydrodynamic pressure bearing module according to the present invention may be such that grooves adjacent to the first oil circulation hole are located at the upper and lower ends of the sleeve- May be formed longer than the grooves adjacent to each other.

Further, in the spindle motor according to an embodiment including the fluid dynamic pressure bearing module according to the present invention, the hole formed in the outer diameter portion of the sleeve portion by the first oil circulation hole may be covered with any one of a sealing member, a bonding agent, have.

A spindle motor according to an embodiment including a fluid dynamic pressure bearing module according to the present invention includes a thrust plate coupled to an upper portion of the shaft and positioned at an upper portion of the sleeve with respect to an axial direction of the shaft, And an upper sealing portion is formed between the sleeve and the thrust plate with respect to a radial direction of the shaft, and an upper sealing portion is formed between the holder and the sleeve A lower sealing portion is formed.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, a first oil circulation hole is formed in a radial direction of the shaft so as to penetrate from an outer diameter to an inner diameter of the sleeve, a second oil circulation hole is formed to connect the upper surface and the lower surface of the sleeve in the axial direction of the shaft, The first oil circulation hole and the second oil circulation hole are communicated with each other to cross each other, and oil is circulated in the upper and lower portions of the sleeve, so that two oil circulation channels are ensured, A fluid dynamic pressure bearing module and a spindle motor including the fluid dynamic pressure bearing module capable of increasing the life of the motor by increasing the amount of oil charged can be obtained.

1 is a cross-sectional view schematically illustrating a fluid dynamic pressure bearing module according to an embodiment of the present invention;
Fig. 2 is a schematic usage view of the fluid dynamic pressure bearing module shown in Fig. 1. Fig.
3 is a cross-sectional view schematically illustrating a spindle motor according to an embodiment in which the fluid dynamic pressure bearing module of the present invention is mounted.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It will be further understood that terms such as " first, "" second," " one side, "" other," and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of a fluid dynamic pressure bearing module and a spindle motor including the fluid dynamic pressure bearing module according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically illustrating a fluid dynamic pressure bearing module according to an embodiment of the present invention. As shown, the fluid dynamic pressure bearing module includes a shaft 10, a sleeve 20, a thrust plate 30, and a holder 40.

More specifically, the shaft 10 is fixedly coupled to the holder 40 at its lower end, and the sleeve 20 is rotatably supported by the shaft 10.

The holder (40) forms a lower sealing portion (LS) between the sleeve and the radial direction of the shaft.

A thrust plate (30) is also located on the top of the sleeve (20) and coupled to the top of the shaft (10). The thrust plate 30 forms an upper sealing part (US) at an interval between the throttle plate 30 and the sleeve 20 with respect to the radial direction of the shaft 10.

The sleeve (20) is formed with a radial dynamic pressure bearing at a minute gap with the shaft. To this end, a radial dynamic pressure generating groove is selectively formed on the inner peripheral surface of the sleeve and the outer peripheral surface of the shaft. 1 shows a radial dynamic pressure generating groove 21 formed in a sleeve according to an embodiment of the present invention.

Also, the radial dynamic pressure generating grooves 21 may be formed to be asymmetric so that the oil circulates in the upper and lower portions of the sleeve, respectively. The grooves 21a adjacent to the first oil circulation hole 22 are formed at the upper and lower ends of the sleeve, respectively, with respect to the first oil circulation hole 22 formed in the radial direction of the sleeve. The grooves 21b are formed longer than the grooves 21b adjacent to the grooves 21b.

Further, the hydrodynamic pressure bearing module according to an embodiment of the present invention may be formed with a thrust dynamic pressure bearing portion. For this purpose, an upper thrust hydrodynamic bearing portion is formed at a minute gap between the sleeve and the thrust plate in the axial direction of the shaft, A lower thrust hydrostatic bearing is formed at a small gap between the sleeve and the holder. To this end, a thrust dynamic pressure generating groove may be selectively formed on one surface of the thrust plate, the opposite surface of the sleeve, and the one surface of the sleeve and the hub facing the thrust plate.

1 shows the thrust dynamic pressure generating grooves 31 and 41 formed in the thrust plate and the holder, respectively.

In addition, the sleeve 20 is formed with oil circulation holes 22 and 23 for circulation of the injected oil to form the fluid dynamic pressure bearing portion. The oil circulation hole is formed with a first oil circulation hole 22 formed to penetrate from the outer diameter to the inner diameter of the sleeve in the radial direction of the shaft 10 and the upper surface and the lower surface of the sleeve in the axial direction of the shaft 10 And the first oil circulation hole 22 and the second oil circulation hole 23 communicate with each other and intersect with each other. Further, in order to form the first oil circulation hole 22, the sleeve is processed by drilling or the like from the outer diameter to the inner diameter in the radial direction of the sleeve. And the holes formed in the outer diameter portion of the sleeve are covered with the sealing member 50 for sealing the fluid.

The holes may be covered by various methods such as welding, bonding, and the like.

Further, in the fluid dynamic pressure bearing module according to the present invention, the sleeve may be a sleeve-integrated hub formed integrally with the hub.

Accordingly, the hydrodynamic pressure bearing module according to an embodiment of the present invention has a full fill structure in which the upper and lower portions of the injected sleeve are connected to form a hydrodynamic bearing portion in the structure of the stationary shaft And the fluid is circulated through the upper and lower portions of the sleeve respectively by the first oil circulation hole 22 and the second oil circulation hole 23, respectively.

More specifically, FIG. 2 is a schematic use-state view of the fluid dynamic pressure bearing module shown in FIG. The groove 21a adjacent to the oil circulation hole 22 is formed to be longer than the groove 21b adjacent to the upper end and the lower end of the sleeve with respect to the oil circulation hole 22 formed in the radial direction of the sleeve, , The fluid dynamic pressure bearing module circulates the fluid in the upper and lower portions of the sleeve by the first oil circulation hole 22 and the second oil circulation hole 23, respectively, as shown by the arrows.

Accordingly, since the upper and lower oil circulation channels are secured, the bearing span can be secured not only long, but also the life of the motor can be improved by increasing the charged amount of the oil.

3 is a cross-sectional view schematically illustrating a spindle motor according to an embodiment in which a fluid dynamic pressure bearing module of the present invention is mounted. The spindle motor 100 includes an armature 150 composed of a shaft 110, a holder 120, a base 130, a thrust plate 140, a core 151 and a coil 152 And a rotating portion including a sleeve-integrated hub 160, a magnet 170 and a sealing member 180. The working fluid is filled with oil to form a hydrodynamic bearing between the rotating portion and the fixed portion, The sleeve-integrated hub is formed with an oil circulation hole for circulating oil, and the oil circulation hole includes a first oil circulation hole formed in the radial direction of the shaft and a second oil circulation hole formed in the axial direction of the shaft.

More specifically, in the rotating portion, the sleeve-integrated hub 160 is rotatably supported by the shaft 110. Also, the inner diameter portion of the sleeve-integrated hub 160 is slightly spaced from the outer diameter portion of the shaft 110, and oil is filled at the minute intervals to form a radial dynamic pressure bearing portion.

The sleeve-integrated hub 160 includes a sleeve portion 161 opposed to the shaft 110, a disc portion 162 extending radially outward from the sleeve portion 161, And a side wall portion 163 extending downward in the axial direction of the shaft at the radially outer end.

The magnet 170 is mounted on the inner circumferential surface of the side wall portion 163 so as to face the armature 150 composed of the core 151 and the coil 152.

In addition, a dynamic pressure generating groove is selectively formed in the inner diameter portion of the sleeve portion 161 or the outer diameter portion of the shaft, and FIG. 3 shows the dynamic pressure generating groove 161a formed in the inner diameter portion of the sleeve portion.

Also, the radial dynamic pressure generating groove 161a may be formed to be asymmetric so that the oil circulates in the upper and lower portions of the sleeve, respectively.

In other words, the first oil circulation hole 161b formed to penetrate the inner and outer diameters of the sleeve-integrated hub 160 in the radial direction is formed on the upper and lower portions of the sleeve with respect to the axial direction of the shaft, The groove 161a 'adjacent to the circulation hole 161b is formed longer than the groove 161a "adjacent to the upper end and the lower end of the sleeve, respectively.

As described above, the sleeve-integrated hub 160 is formed with an oil circulation hole for circulating the oil in the sleeve portion 161, and the oil circulation hole is formed in the radial direction of the shaft from the outer diameter of the sleeve portion to the inner diameter And a second oil circulation hole 161c formed in the axial direction of the shaft.

Also, the first oil circulation hole 161b and the second oil circulation hole 161c intersect to communicate with each other.

And the inner circumference of the sleeve-integrated hub is radially inwardly radially formed from the sleeve-integrated hub to form the first oil circulation hole 161b. The hole formed in the outer diameter portion of the sleeve portion is sealed for sealing the fluid Is covered with a sealing member (180).

The shaft 110 rotatably supports the sleeve-integrated hub 160, the thrust plate 140 is fixedly coupled to the upper end of the shaft 110, and the holder 120 is press- And is fixed by adhesion or the like.

In addition, the sleeve-integrated hub 160 is positioned between the holder 120 and the thrust plate 140. An upper sealing part (US) is formed between the thrust plate 140 and the sleeve-integrated hub 160. A lower sealing part LS is formed between the holder 120 and the sleeve- A lower sealing part is formed.

The holder 120 is press-fitted into the inner peripheral portion of the base 160 and an armature 150 composed of a core 151 and a coil 152 is press-fitted or adhered to the outer peripheral portion of the base 160, And the like.

Further, in the spindle motor according to the present invention, the sleeve-integrated hub may have a sleeve and a hub separately and may be combined with each other.

Further, in the spindle motor according to the present invention, the holder and the base may be integrally formed.

Accordingly, the spindle motor including the hydrodynamic pressure bearing module of the present invention secures two oil circulation channels as the oil circulates in the upper and lower portions of the sleeve, thereby ensuring a long bearing span A spindle motor in which the amount of oil charged is increased and the lifetime of the motor is improved can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: shaft 20: sleeve
21: radial dynamic pressure generating groove 22: first oil circulation hole
23: Second oil circulation hole
21a and 21b: grooves
30: thrust plate 40: holder
50: sealing member
100: Spindle motor
110: shaft 120: holder
130: base 140: thrust plate
150: armature 151: core
152: Coil 160: Sleeve-integrated hub
161: Sleeve portion 162:
163:
170: Magnet 180: Sealing member
161a: radial dynamic pressure generating groove 161b: first oil circulation hole
161c: second oil circulation hole
161a ', 161a'': groove

Claims (11)

shaft; And
And a sleeve rotatably supported on the shaft,
Oil is filled in a minute gap between the shaft and the sleeve to form a fluid dynamic pressure bearing portion,
Wherein the sleeve has a first oil circulation hole passing through an inner diameter and an outer diameter of the sleeve in a radial direction of the shaft and a second oil circulation hole connecting an upper surface and a lower surface of the sleeve in an axial direction of the shaft, Wherein the first oil circulation hole and the second oil circulation hole are communicated and intersected.
The method according to claim 1,
Wherein the sleeve has a radial dynamic pressure generating groove formed on an inner circumferential surface opposed to the shaft,
Wherein the radial dynamic pressure generating grooves are respectively formed on the upper and lower portions of the sleeve in the axial direction of the shaft with respect to the first oil circulation hole.
The method of claim 2,
Wherein the radial dynamic pressure generating grooves are formed such that the grooves adjacent to the first oil circulation holes are longer than the grooves adjacent to the upper and lower ends of the sleeve with respect to the axial direction of the shaft.
The method according to claim 1,
Wherein the hole formed in the sleeve outer circumferential portion by the first oil circulation hole is covered by any one of a sealing member, a bonding agent, and a brazing material.
The method according to claim 1,
A thrust plate coupled to an upper portion of the shaft and positioned at an upper portion of the sleeve with respect to an axial direction of the shaft; And
Further comprising a holder coupled to a lower portion of the shaft and positioned at a lower portion of the sleeve with respect to an axial direction of the shaft,
An upper sealing portion is formed between the sleeve and the thrust plate with respect to a radial direction of the shaft, and a lower sealing portion is formed between the holder and the sleeve.
A rotary unit including a sleeve-integrated hub and a magnet coupled to an inner circumferential surface of the sleeve-integrated hub,
A thrust plate coupled to an upper portion of the shaft, a holder coupled to a lower portion of the shaft, a base coupled to the holder, a base coupled to the outer periphery of the base to face the magnet, And a fluid dynamic pressure bearing part is formed between the rotary part and the fixed part,
Wherein the sleeve-integrated hub is formed with an oil circulation hole for circulating oil, and the oil circulation hole includes a first oil circulation hole formed in the radial direction of the shaft and a second oil circulation hole formed in the axial direction of the shaft, .
The method of claim 6,
The sleeve-
A sleeve portion opposed to the shaft, a disk portion extending radially outward from the sleeve portion, and a side wall portion extending downward in the axial direction of the shaft at a radially outer end of the disk portion.
The method of claim 7,
Wherein the sleeve portion of the sleeve-integrated hub has a radial dynamic pressure generating groove formed on an inner circumferential surface thereof opposed to the shaft,
Wherein the radial dynamic pressure generating grooves are respectively formed at upper and lower portions of the sleeve-integrated hub in the axial direction of the shaft with respect to the first oil circulation hole.
The method of claim 8,
Wherein the radial dynamic pressure generating grooves are formed such that the grooves adjacent to the first oil circulation holes are longer than the grooves adjacent to the upper and lower ends of the sleeve-integrated hub relative to the axial direction of the shaft.
The method of claim 6,
Wherein the hole formed in the outer diameter portion of the sleeve portion by the first oil circulation hole is covered with any one of a sealing member, a bonding agent, and a brazing material.
The method of claim 6,
A thrust plate coupled to an upper portion of the shaft and positioned at an upper portion of the sleeve with respect to an axial direction of the shaft; And
Further comprising a holder coupled to a lower portion of the shaft and positioned at a lower portion of the sleeve with respect to an axial direction of the shaft,
Wherein an upper sealing portion is formed between the sleeve and the thrust plate with respect to a radial direction of the shaft, and a lower sealing portion is formed between the holder and the sleeve.
KR1020120145590A 2012-12-13 2012-12-13 Hydrodynamic Bearing Module and Spindle Motor having the same KR20140077266A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120145590A KR20140077266A (en) 2012-12-13 2012-12-13 Hydrodynamic Bearing Module and Spindle Motor having the same

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