KR20130044406A - Hydrodynamic bearing assembly and spindle motor comprising thereof - Google Patents

Hydrodynamic bearing assembly and spindle motor comprising thereof Download PDF

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Publication number
KR20130044406A
KR20130044406A KR1020110108442A KR20110108442A KR20130044406A KR 20130044406 A KR20130044406 A KR 20130044406A KR 1020110108442 A KR1020110108442 A KR 1020110108442A KR 20110108442 A KR20110108442 A KR 20110108442A KR 20130044406 A KR20130044406 A KR 20130044406A
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KR
South Korea
Prior art keywords
shaft
sleeve
oil
rotor hub
bearing assembly
Prior art date
Application number
KR1020110108442A
Other languages
Korean (ko)
Inventor
정신영
유창조
Original Assignee
삼성전기주식회사
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Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020110108442A priority Critical patent/KR20130044406A/en
Publication of KR20130044406A publication Critical patent/KR20130044406A/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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
    • F16C17/107—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure with at least one surface for radial load and at least one surface for axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/107—Grooves for generating pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • F16C33/741—Sealings of sliding-contact bearings by means of a fluid
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

PURPOSE: A fluid dynamic bearing assembly and a spindle motor with the same are provided to minimize manufacturing tolerance simultaneously and to improve productivity by reducing the number of parts comprising the spindle motor. CONSTITUTION: A fluid dynamic bearing assembly comprises a shaft(110), an upper sleeve, a lower sleeve, a rotor hub(130), an upper thrust unit(140), and a lower thrust unit(150). The shaft is fixed directly or indirectly to a base. The upper and lower sleeves are installed vertically and independently to be rotatable by the medium of oil while maintaining a bearing gap with the shaft. The rotor hub is fixed to the outer peripheries of the upper and lower sleeves at the same time. The upper and lower thrust units are fixed to the shaft. Oil interface is formed between the upper and lower sleeves, respectively.

Description

Hydrodynamic bearing assembly and spindle motor comprising same

The present invention relates to a fluid dynamic bearing assembly and a spindle motor having the same.

A recording disk drive for a server is generally equipped with a so-called shaft fixed spindle motor in which a shaft having high impact resistance is fixed to a box of the recording disk drive.

That is, the spindle motor mounted in the recording disk drive device for the server is fixedly installed in order to prevent the information recorded in the server from being damaged by the external impact and becoming impossible to record / read.

When the fixed shaft is installed as described above, in order to construct an oil-mediated hydrodynamic bearing assembly, a base and a shaft, which are fixed members, are generally required, and a sleeve and a hub, which is a cover and a rotating member, for shielding the fixed member are required. do.

In other words, many components are required to construct a hydrodynamic bearing assembly having a fixed shaft, and the production process time is increased due to many components, and the tolerances of the spindle motor are increased due to the tolerances on many components. There is a problem that can not but increase.

Therefore, in the spindle motor including the fixed shaft, there is an urgent need for a study related to a structure for easily forming an oil interface while improving the productivity by reducing the number of parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spindle motor which reduces the number of parts to improve productivity, minimizes manufacturing tolerances, and at the same time makes processing simple and facilitates the formation of an oil interface.

A hydrodynamic bearing assembly according to an embodiment of the present invention includes a shaft fixed directly or indirectly to a base; Upper and lower sleeves installed up and down as separate members rotatably through oil while maintaining the shaft and bearing gaps; A rotor hub provided to be simultaneously fixed to outer peripheral surfaces of the upper and lower sleeves; And upper and lower thrust parts fixed to the shaft and configured to form an oil interface between the upper and lower sleeves, respectively.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the lower sleeve and the rotor hub may be integrally provided.

In the fluid dynamic bearing assembly according to an embodiment of the present invention, one surface of the upper sleeve may be formed to be inclined downward toward the inner side in a radial direction such that the oil interface is formed together with the upper thrust portion.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the upper thrust portion is disposed on an upper surface of the upper sleeve and is coupled to the shaft and extends downward from the coupling portion to be in contact with one surface of the upper sleeve. It may be provided with an extension for forming an oil interface.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the shaft is formed by being recessed from an outer circumferential surface to separate the oil filled in the gap formed by the upper and lower sleeves and the shaft into an upper side and a lower side in an axial direction. It may be provided with a separation groove.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the upper or lower sleeve has a communicating portion disposed opposite to the separating groove so as to communicate the separating groove with the outside, respectively, in the axial direction above and below the communicating portion, respectively. The interface of oil can be formed.

In the fluid dynamic bearing assembly according to an embodiment of the present invention, the communication unit may include a horizontal communication groove formed in an outer diameter direction in the upper or lower sleeve at a portion where the upper and lower sleeves abut; And a vertical communication groove communicating with the horizontal communication groove, the vertical communication groove being formed axially in at least one of the upper sleeve, the lower sleeve and the rotor hub at a portion where the upper or lower sleeve is in contact with the rotor hub.

In the fluid dynamic bearing assembly according to the exemplary embodiment of the present invention, the axial position of the surface where the upper sleeve and the lower sleeve abut may correspond to the axial position of the separation groove provided in the shaft.

The spindle motor according to an embodiment of the present invention may include a fluid dynamic bearing assembly according to an embodiment of the present invention.

According to the spindle motor according to the present invention, it is possible to reduce the number of parts constituting the spindle motor to improve productivity and to minimize the manufacturing tolerances.

It is also possible to facilitate the injection of oil for fluid dynamic bearings.

In addition, it is possible to reduce the repeatable run out (RRO), thereby minimizing fine vibrations to maximize performance.

1 is a schematic cross-sectional view showing a spindle motor according to an embodiment of the present invention,
2 is a schematic enlarged cross-sectional view of A of FIG. 1,
3 is a schematic exploded perspective view showing major components of a spindle motor according to an embodiment of the present invention;
Figure 4 is a perspective view showing an embodiment of the communication unit provided in the spindle motor according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a schematic cross-sectional view illustrating a spindle motor according to an embodiment of the present invention, FIG. 2 is a schematic enlarged cross-sectional view of A of FIG. 1, and FIG. 3 is a main component of a spindle motor according to an embodiment of the present invention. Figure 4 is a schematic exploded perspective view showing, Figure 4 is a perspective view showing an embodiment of the communication unit provided in the spindle motor according to an embodiment of the present invention.

1 to 4, the spindle motor 100 according to an embodiment of the present invention is the shaft 110 and the upper and lower thrust portion 140 (directly or directly fixed to the base 120, which is a fixing member) ( 150, the upper and lower sleeves 132a and 132b, which are rotating members, may include the rotor hub 130.

First, when defining a term for the direction, the axial direction refers to the up and down direction with respect to the shaft 110, as shown in Figure 1, the radially outer or inward direction relative to the shaft 110, the rotor hub ( The center direction of the shaft 110 may be referred to based on the outer end direction of the 130 or the outer end of the rotor hub 130.

In addition, the circumferential direction may mean a direction in which the rotor hub 130 rotates, that is, a direction corresponding to the outer circumferential surface of the rotor hub 130.

Here, the shaft 110, the upper and lower sleeves (132a, 132b), the rotor hub 130, the upper and lower thrust parts 140, 150 are bearings in the operation of rotating the rotating member relative to the fixing member It may be provided with a fluid dynamic bearing assembly to serve.

The base 120 may be a fixing member that supports the rotation of the rotating member with respect to the rotating member including the rotor hub 130.

Here, the base 120 may form a predetermined space together with the rotor hub 130, and the core 190 in which the coil 180 is wound may be disposed in the space.

That is, the base 120 may include a core coupling part 122 extending upward in the axial direction, and the core 190 around which the coil 180 is wound is inserted into an outer circumferential surface of the core coupling part 122. Can be fixedly installed.

The shaft 110 may be fixed to the base 120 indirectly or directly fixed to the base 120 through the lower thrust part 150. The lower thrust part 150 and the upper thrust part 140 may be installed. ) Together with the fixing member.

Here, the shaft 110 may be inserted into a hole formed in the disc portion 152 of the lower thrust portion 150 and may be fixed by at least one method of press-fitting, welding, and bonding.

In addition, the shaft 110 is recessed from the outer circumferential surface to separate the oil O, which is filled in the gap between the shaft 110 and the upper and lower sleeves 132a and 132b, in the upper and lower directions in the axial direction ( 112).

The cross-sectional shape in the axial direction of the separation groove 112 may be inclined "V" shape, the separation groove 112 is the oil (O) together with the inner circumferential surface of the upper and lower sleeves (132a, 132b) The interface (I1, I2) of the () can be formed.

Details thereof will be described later.

In addition, in FIG. 1, the shaft 110 is fixed to the lower thrust part 150 to be indirectly fixed to the base 120, but is not limited thereto. The shaft 110 may be directly fixed to the base 120. have.

The upper and lower sleeves 132a and 132b may be installed up and down as separate members so as to be rotatable through oil O while maintaining a bearing gap between the shaft 110 and the bearing 110.

On the other hand, the upper end of the upper sleeve 132a may have an inclined portion in which the upper outer diameter is formed larger than the outer diameter of the lower side to form a gas-liquid interface with the upper thrust portion 140. In addition, the lower end of the lower sleeve 132b may have an inclined portion having a lower outer diameter larger than an outer diameter of the upper side to form a gas-liquid interface together with the lower thrust portion 150.

In other words, an upper outer diameter is formed at an upper end of the upper sleeve 132a so that a third oil interface I3 may be formed in a space between the outer circumferential surface of the upper sleeve 132a and the inner circumferential surface of the upper thrust portion 140. A larger inclined portion may be formed, and a lower end portion of the lower sleeve 132b may be formed to form a fourth oil interface I4 in a space between an outer circumferential surface of the lower sleeve 132b and an inner circumferential surface of the lower thrust portion 150. An inclined portion whose side outer diameter is formed larger than the outer diameter of the upper side may be formed.

In addition, the upper and lower sleeves 132a and 132b may be provided with upper and lower through holes 138a and 138b so that the shaft 110 is inserted.

Furthermore, the upper and lower sleeves 132a and 132b may maintain a gap with the shaft 110 and form a bearing gap B1 and B2 with the shaft 110.

That is, the upper and lower sleeves 132a and 132b are formed of the upper and lower sleeves 132a and 132b when the upper and lower sleeves 132a and 132b are rotatably installed on the shaft 110. The gap between the inner circumferential surface and the outer circumferential surface of the shaft 110 may form bearing gaps B1 and B2 to form a hydrodynamic bearing.

Here, the bearing gaps B1 and B2 will be described in detail. The bearing gaps B1 and B2 may include an upper bearing gap B1 and a lower bearing gap B2.

The upper and lower bearing gaps B1 and B2 may be formed in an upper side and a lower side in the axial direction, respectively, based on the separating groove 112 formed in the shaft 110, and the upper side of the separating groove 112 is the upper side. A first oil interface I1, which is an interface between the oil O filled in the bearing gap B1 and air, may be formed. Here, the axial position of the separation groove 112 may be provided to correspond to the axial position of the surface where the upper sleeve 132a and the lower sleeve 132b abut.

In addition, a second oil interface I2, which is an interface between oil O and air filled in the lower bearing gap B2, may be formed at a lower side of the separation groove 112.

Here, the upper and lower bearing gaps B1 and B2 may be formed at positions corresponding to the upper and lower sleeves 132a and 132b, respectively, and the outer circumferential surface of the shaft 110 or the upper and lower sleeves 132a. It may be implemented by a dynamic pressure groove provided on the inner peripheral surface of the (132b).

That is, at least one of the inner circumferential surface of the upper and lower sleeves 132a and 132b and the outer circumferential surface of the shaft 110 may be formed with a fluid dynamic pressure part 133, and the fluid dynamic pressure part 133 may be oil (O). Radial dynamic pressure can be generated through

That is, at least one of the inner circumferential surface of the upper and lower sleeves 132a and 132b and the outer circumferential surface of the shaft 110 constituting the upper and lower bearing gaps B1 and B2 described above may have a herringbone shape, a spiral shape, or a screw (screw). ) Grooves are formed to generate radial dynamic pressure that supports rotation of the upper and lower sleeves 132a and 132b through the oil O.

The separation groove 112 may be inclined "V" shape as described above, to prevent the leakage of the oil due to capillary phenomenon.

Here, in order to form the first oil interface I1 and the second oil interface I2, the oil O filled in the upper bearing gap B1 and the lower bearing gap B2 is in contact with air. .

Therefore, at least one of the upper sleeve 132a, the lower sleeve 132b, and the rotor hub 110 communicates the separating groove 112 formed in the shaft 110 with the outside to communicate with the outside. ) May be provided.

That is, the outside of the separation groove 112 and the rotor hub 130 may be the same pressure due to the communication portion 131.

Here, the communication portion 131 is a horizontal communication groove 131h and the horizontal formed in the outer diameter direction to the upper or lower sleeves (132a, 132b) in contact with the upper and lower sleeves (132a, 132b). At least one of the upper sleeve 132a, the lower sleeve 132b, and the rotor hub 110 at a portion in communication with the communication groove 131h and in which the upper or lower sleeve 132a and 132b contact the rotor hub 130. It may include a vertical communication groove (131v) formed in the axial direction.

That is, in one embodiment of the present invention, rather than forming a hole in a predetermined member to provide the communicating portion 131, a groove is formed in a portion where one member (part) is in contact with another member (part). The separation groove 112 may be in communication with the outside.

In the accompanying drawings, a configuration in which the communicating portion 131 is provided with the horizontal and vertical communication grooves 131h and 131v in the upper sleeve 132a is illustrated, but is not limited thereto, and the upper sleeve ( At least one of the 132a, the lower sleeve 132b, and the rotor hub 110 or a groove provided on the outer surface of two members thereof may be in communication with each other.

The rotor hub 130 may be provided to be simultaneously fixed to the outer circumferential surfaces of the upper and lower sleeves 132a and 132b, and a recording medium may be mounted.

Here, the rotor hub 130 may be provided integrally with the lower sleeve 132b. That is, the rotor hub 130 provided to the spindle motor 100 according to an embodiment of the present invention may include both the functions of the conventional sleeve and the conventional hub.

Therefore, according to the present invention, since the rotor hub 130 is integrally provided with the lower sleeve 132b, the conventional sleeve and the conventional hub may be partially replaced by one part, thereby reducing the number of parts, thereby reducing productivity. The manufacturing tolerance can be minimized while improving the efficiency.

In addition, since the repeatable run out (RRO) can be reduced by the rotor hub 130 in which the conventional sleeve and the conventional hub are partially integrated, fine vibration can be minimized to maximize performance.

Specifically, the rotor hub 130 may include a space forming portion 134 and a magnet support portion 136 which are simultaneously fixed to the outer circumferential surfaces of the upper and lower sleeves 132a and 132b and extend radially outward. .

In addition, the space forming portion 134 of the rotor hub 130 may be formed to extend radially outward from the body portion 132, the core 190 with which the coil 180 is wound along with the base 120 It can form a space to be arranged.

 The rotor hub 130 may be continuously formed with the space forming part 134 and may include a magnet support part 136 extending downward from the space forming part 134 in the axial direction. The magnet assembly 196 may be coupled to 136.

That is, the magnet assembly 196 may be coupled to the inner circumferential surface of the magnet support part 136, and a disk D spaced apart from the spacer S may be inserted into the outer circumferential surface.

Meanwhile, the magnet assembly 196 may include a yoke 194 fixed to an inner circumferential surface of the magnet support 136 and a magnet 192 installed on an inner circumferential surface of the yoke 194.

The yoke 194 may serve to increase the magnetic flux density by directing the magnetic field from the magnet 192 toward the core 190 to which the coil 180 is wound.

On the other hand, the yoke 194 may have a circular ring shape, and may be formed to have a bent end portion to improve the magnetic flux density due to the magnetic field generated from the magnet 192.

The magnet 192 may have a ring shape, and may be a permanent magnet in which N poles and S poles are alternately magnetized along a circumferential direction to generate a magnetic field of a predetermined intensity.

On the other hand, the magnet 192 is disposed opposite to the tip of the core 190, the coil 180 is wound, the rotor hub 130 by the electromagnetic interaction with the core 190, the coil 180 is wound Generate a driving force to be able to rotate.

That is, when power is supplied to the coil 180, the driving force to which the rotor hub 130 may be rotated by the electromagnetic interaction between the core 190 on which the coil 180 is wound and the magnet 192 disposed opposite thereto. In this case, the rotor hub 130 may be rotated based on the shaft 110.

The upper thrust portion 140 and the lower thrust portion 150 may form an interface of oil O together with the outer circumferential surface of the sleeve 132, and are coupled to the shaft 110 to form the shaft 110 and the fixing member. Can be configured.

The upper thrust portion 140 may be coupled to the upper end of the shaft 110, and more specifically, the fastening portion 142 and the fastening coupled to the shaft 110 while being disposed on the upper surface of the upper sleeve 132a. It may include an extension portion 144 extending downward from the portion 142 in the axial direction.

That is, the cross-sectional area of the upper thrust portion 140 in the axial direction may be “-” shaped and may be continuously formed along the circumferential direction.

The upper thrust part 140 may be coupled to the shaft 110 in at least one of welding, bonding, and pressing.

In addition, a thrust dynamic pressure part (not shown) for generating thrust dynamic pressure may be formed on at least one of a bottom surface of the fastening part 142 of the upper thrust part 140 or an upper surface of the upper sleeve 132a.

Here, an interface between oil O and air, that is, a third oil interface I3 may be formed between the inner circumferential surface of the extension part 144 of the upper thrust part 140 and the outer circumferential surface of the upper sleeve 132a. have.

Therefore, the oil O filled in the upper bearing gap B1 forms the first oil interface I1 and the third oil interface I3.

Specifically, the outer circumferential surface of the upper sleeve 132a facing the extension 144 to form the third oil interface I3 may be formed to be inclined downward toward the radially inner side.

The lower thrust part 150 may be inserted into and fixed to the base 120, and more specifically, the outer circumferential surface of the lower thrust part 150 is joined to the inner circumferential surface of the core coupling part 122 of the base 120. Can be installed.

On the other hand, the inner circumferential surface of the lower thrust portion 150 may be fixed to the lower end of the shaft 110, specifically, the lower thrust portion 150 is a disk portion 152 and the coupling to the shaft 110 and the A wall portion 154 extending from the disk portion 152 to the upper side in the axial direction may be provided.

That is, the lower thrust part 150 may have a hollow cup shape, a cross section in the axial direction may have a “b” shape, and may be continuously formed along the circumferential direction.

On the other hand, the outer circumferential surface of the lower thrust portion 150 may be coupled to each other in at least one of the inner circumferential surface of the core coupling portion 122 of the base 120 and welding, bonding and indentation.

In addition, a thrust dynamic pressure part (not shown) for generating a thrust dynamic pressure may be formed on at least one of an upper surface of the lower thrust part 150 or a bottom surface of the body part 132 of the rotor hub 130.

Here, an interface between oil O and air, that is, a fourth oil interface I4, may be formed between the inner circumferential surface of the wall portion 154 of the lower thrust portion 150 and the outer circumferential surface of the body portion 132 of the rotor hub 130. ) May be formed.

In detail, the outer circumferential surface of the body portion 132 of the rotor hub 130 facing the wall portion 154 may be inclined upward toward the radially inner side to form the fourth oil interface I4.

Accordingly, the oil O filled in the lower bearing gap B1 forms the second oil interface I2 and the fourth oil interface I4.

Spindle motor according to an embodiment of the present invention is provided with a fluid dynamic bearing assembly which is provided in two of the upper and lower by the configuration of the communication portion 131 for communicating the separation groove 112 provided in the shaft 110 with the outside. Done. That is, it is provided with a hydrodynamic bearing assembly having a partial-fill partition divided into two parts, not a full-fill shape. Partial fill fluid hydrodynamic bearing assembly may be difficult to fill the fluid in the bearing gap, it may be easier to do this according to an embodiment of the present invention.

That is, the shaft 120, the lower thrust portion 150, and the lower sleeve 132b (which can be integrally provided with the rotor hub 130) are installed on the base 120, and the lubricating fluid is provided through the separation groove 112. The second oil interface (I2) and the fourth oil interface (I4) may be formed by injecting the first fluid dynamic part below. Thereafter, the upper sleeve 132a and the upper thrust part 140 may be assembled to form the first oil interface I1 and the third oil interface I3.

According to this, it can be very easy to inject oil into the fluid dynamic bearing assembly of the parshall fill structure.

Through the above embodiment, the spindle motor 100 according to an embodiment of the present invention by implementing a conventional sleeve and the hub in one part, it is possible to improve the productivity and at the same time minimize the manufacturing tolerances.

In addition, it is possible to reduce the repeated run out (RRO) due to the reduction of the number of parts can minimize the micro-vibration to maximize the performance.

In addition, by integrating the sleeve 132 member into an upper side and a lower side, it is possible to facilitate the injection of the oil (O) having a parshall pill structure.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that such modifications or variations are within the scope of the appended claims.

100: spindle motor 110: shaft
112: separation groove 120: base
130: rotor hub 140: upper thrust portion
150: lower thrust part 180: coil
190: core

Claims (9)

A shaft fixed directly or indirectly to the base;
Upper and lower sleeves installed up and down as separate members rotatably through oil while maintaining the shaft and bearing gaps;
A rotor hub provided to be simultaneously fixed to outer peripheral surfaces of the upper and lower sleeves; And
And an upper and lower thrust part fixed to the shaft and configured to respectively form an oil interface between the upper and lower sleeves.
The method of claim 1,
The lower sleeve and the rotor hub are integrally provided with a hydrodynamic bearing assembly.
The method of claim 1,
One surface of the upper sleeve is inclined downward toward the radially inward so that the oil interface is formed with the upper thrust portion.
The method of claim 2,
The upper thrust portion is disposed on the upper surface of the upper sleeve fluid dynamic bearing having a fastening portion coupled to the shaft and an extension portion extending downward from the fastening portion to form an oil interface between one surface of the upper sleeve assembly.
The method of claim 1,
And the shaft has a separation groove formed by being recessed from an outer circumferential surface to separate the oil filled in the gap formed by the upper and lower sleeves and the shaft into an upper side and a lower side in an axial direction.
The method of claim 5,
The upper or lower sleeve has a communication portion disposed to face the separation groove to communicate the separation groove with the outside,
A fluid dynamic bearing assembly having an interface of the oil formed on an upper side and a lower side in the axial direction of the communicating portion, respectively.
The method of claim 6, wherein the communication unit,
A horizontal communication groove formed in an outer diameter direction of the upper or lower sleeve at a portion where the upper and lower sleeves abut; And
And a vertical communication groove communicating with the horizontal communication groove, the vertical communication groove being axially formed in at least one of the upper sleeve, the lower sleeve, and the rotor hub in a portion where the upper or lower sleeve is in contact with the rotor hub.
The method of claim 5,
The axial position of the surface in which the upper sleeve and the lower sleeve abuts corresponds to the axial position of the separation groove provided in the shaft.
A spindle motor comprising the fluid dynamic bearing assembly of claim 1.
KR1020110108442A 2011-10-24 2011-10-24 Hydrodynamic bearing assembly and spindle motor comprising thereof KR20130044406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110108442A KR20130044406A (en) 2011-10-24 2011-10-24 Hydrodynamic bearing assembly and spindle motor comprising thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110108442A KR20130044406A (en) 2011-10-24 2011-10-24 Hydrodynamic bearing assembly and spindle motor comprising thereof

Publications (1)

Publication Number Publication Date
KR20130044406A true KR20130044406A (en) 2013-05-03

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KR1020110108442A KR20130044406A (en) 2011-10-24 2011-10-24 Hydrodynamic bearing assembly and spindle motor comprising thereof

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