KR20140035650A - Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same - Google Patents

Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same Download PDF

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Publication number
KR20140035650A
KR20140035650A KR1020120102154A KR20120102154A KR20140035650A KR 20140035650 A KR20140035650 A KR 20140035650A KR 1020120102154 A KR1020120102154 A KR 1020120102154A KR 20120102154 A KR20120102154 A KR 20120102154A KR 20140035650 A KR20140035650 A KR 20140035650A
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KR
South Korea
Prior art keywords
sleeve
shaft
stopper plate
bearing assembly
rotor
Prior art date
Application number
KR1020120102154A
Other languages
Korean (ko)
Inventor
김성훈
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 KR1020120102154A priority Critical patent/KR20140035650A/en
Publication of KR20140035650A publication Critical patent/KR20140035650A/en

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    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/56—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

Abstract

The present invention relates to a fluid dynamic bearing assembly, a spindle motor comprising the same, and a hard disk drive comprising the same, and comprises: a sleeve in which a shaft is inserted; a rotor combined to the upper part of the shaft and rotating with the shaft; and a stopper plate which the lower surface is fixedly combined on the upper surface of the inner side in a radial direction of the sleeve and prevents damage of the shaft when the shaft is rotating.

Description

Hydrodynamic bearing assembly, spindle motor comprising same and hard disk drive comprising same {Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same}

The present invention relates to a hydrodynamic bearing assembly, a spindle motor comprising the same, and a hard disk drive comprising the same.

The compact spindle motor used in the recording disc drive device includes a fixed member, a rotating member coupled to the fixed member to rotate about an imaginary rotation axis, a stopper member for preventing the rotation member from being separated, and interposed between the rotating member and the fixed member. It consists of a lubricating fluid to be rotated, the rotation of the rotating member is supported by the fluid pressure generated by the lubricating fluid.

The stopper member is fixedly coupled to the rotating member, and includes a flange-shaped member coupled to the shaft of the rotating member, and a ring-shaped member coupled to the rotor case of the rotating member.

However, the flange type stopper member is difficult to be integrally processed with the shaft, and when separately processed and assembled to the shaft, there is a problem that a high level of process quality such as sealing management and coaxiality management is required.

In addition, the ring-shaped stopper member has a solid friction behavior because no lubricating fluid is interposed between the stopper member and the fixing member, thereby increasing wear and friction loss between the members and introducing particles from the wear into the bearing. There is a problem that there is a risk.

In order to solve the above problems, the applicant has filed and registered in Korean Patent Application Publication No. 10-2012-0006717 (hereinafter referred to as "registered patent"). However, the bypass flow path provided in the registered patent is in communication with the bearing gap formed by the shaft and the sleeve, there is a problem that the circulation of the fluid and the discharge of bubbles is difficult.

Korean Patent Publication No. 10-2012-0006717

The present invention is to solve the above problems, it is possible to provide a stopper plate to prevent over-injury of the rotor and the shaft and to provide the thrust dynamic pressure bearing in the most efficient position.

Furthermore, the present invention may allow the upper end of the bypass passage communicating with the upper and lower sides of the sleeve to communicate with the outer side of the sleeve to facilitate the circulation of the lubricating fluid and the discharge of bubbles.

The hydrodynamic bearing assembly according to an embodiment of the present invention includes a sleeve into which a shaft is inserted; A rotor coupled to an upper portion of the shaft and rotating together with the shaft; And a stopper plate fixedly coupled to a radially inner upper surface of the sleeve and preventing injury of the shaft during rotation of the shaft.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, at least one of an upper surface of the stopper plate and a lower surface of the rotor corresponding thereto may be formed with a dynamic pressure generating groove.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the dynamic pressure generating groove may be formed on at least one of a radially outer upper surface of the stopper plate and a lower surface of the rotor corresponding thereto.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, a gap may be formed so that a lubricating fluid is filled on an inner circumferential surface of the stopper plate and an outer circumferential surface of the shaft corresponding thereto.

In the fluid dynamic bearing assembly according to the exemplary embodiment of the present invention, the inner diameter of the stopper plate may be smaller than the inner diameter of the sleeve.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the shaft may include a step that is caught on the lower surface of the inner diameter side of the stopper plate.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the rotor includes a cylindrical wall portion extending downward in an axial direction, and a gas-liquid interface of a lubricating fluid is formed between the inner surface of the cylindrical wall portion and the outer surface of the regular sleeve. Can be.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the sleeve has a bypass flow path communicating with an axial upper surface and a lower surface, and the bypass flow path is connected between the sleeve and the stopper plate to an outer surface of the sleeve. A communication unit communicating with may be provided.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the communication portion may be a first communication groove formed on an axial upper surface of the sleeve and communicating the bypass passage with an outer surface of the sleeve.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the communicating portion may be a second communicating groove formed on an axial lower surface of the stopper plate and communicating the bypass passage with an outer surface of the sleeve.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the communicating portion may be a stepped gap formed on an axial upper surface of the sleeve and stepped axially downward from the radially inner side to the outer side with respect to the bypass flow path. have.

In at least one of an upper surface of the stopper plate and a lower surface of the rotor corresponding thereto in the hydrodynamic bearing assembly according to an embodiment of the present invention, a dynamic pressure generating groove is formed outside the axial upper surface communication portion of the bypass flow path formed in the sleeve. This can be formed.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the stopper plate may be provided to cover all of the upper surface of the sleeve.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the stopper plate has a fixing protrusion projecting downward in the axial direction in the radially inner side, and the sleeve has a fixing groove in which the fixing protrusion is fitted to the upper surface in the radial direction. It may be provided.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the fixing protrusion and the fixing groove may be continuously provided along the circumferential direction.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the fixing protrusion may be press-fitted to the fixing groove.

In the hydrodynamic bearing assembly according to an embodiment of the present invention, the fixing protrusion may be bonded to the fixing groove by an adhesive.

Spindle motor according to an embodiment of the present invention includes a rotor including a hollow shaft is inserted into the shaft and a magnet support extending from the hub in the outer diameter direction and bent downward in the axial direction to support the magnet; A bearing member including a sleeve for supporting rotation of the shaft and a stopper plate fixedly coupled to an upper surface in a radially inner upper surface of the sleeve and preventing the floating of the shaft during rotation of the shaft; And a stator positioned at an outer side of the sleeve and including a core to which a winding coil is wound to generate a rotational driving force by electromagnetic interaction with the magnet.

According to an aspect of the present invention, there is provided a hard disk drive including: a spindle motor that rotates a disk by a power supplied through a substrate; A magnetic head for recording and reproducing data of the disk; And a head transfer part for moving the magnetic head to a predetermined position on the disc.

With the present invention, a stopper plate can be provided to prevent over-injury of the rotor and shaft and to provide the thrust dynamic bearing in the most efficient position.

Furthermore, the present invention allows the upper end of the bypass passage communicating with the upper and lower sides of the sleeve to be communicated toward the outer side of the sleeve to facilitate the circulation of the lubricating fluid and the discharge of bubbles.

1 is a schematic cross-sectional view for explaining a hydrodynamic bearing assembly and a spindle motor including the same according to an embodiment of the present invention.
2 is an enlarged view of a portion A in Fig.
3 is a cutaway perspective view of a fluid dynamic bearing assembly according to an embodiment of the present invention.
4 (a) and 4 (b) are cutaway perspective views of a stopper plate according to an embodiment of the present invention.
5A and 5B are cutaway perspective views of a sleeve according to an embodiment of the present invention.
6 is a pattern diagram of a herringbone groove of a thrust dynamic bearing according to an embodiment of the present invention.
7 is a pattern diagram of a helical groove of a thrust dynamic bearing according to an embodiment of the present invention.
8 is a cross-sectional view illustrating a hard disk drive according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. 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 that fall within the scope of the inventive concept may be easily suggested, but are also included within the scope of the present invention.

In addition, the component with the same function within the range of the same idea shown by the figure of each embodiment is demonstrated using the same or similar reference numeral.

1 is a schematic cross-sectional view illustrating a fluid dynamic bearing assembly and a spindle motor including the same according to an embodiment of the present invention, FIG. 2 is an enlarged view of a portion A of FIG. 1, and FIG. 3 is an embodiment of the present invention. Cutaway perspective view of a fluid dynamic bearing assembly according to an example, Figure 4 is a cutaway perspective view of the stopper plate according to an embodiment of the present invention, Figure 5 (a) and (b) is a sleeve according to an embodiment of the present invention Incision perspective view.

1 and 2, the spindle motor 1000 according to an embodiment of the present invention may include a fluid dynamic bearing assembly 100, a rotor 20, and a stator 40.

Specific embodiments of the hydrodynamic bearing assembly 100 will be described below, and the spindle motor 1000 according to the present invention may have all the specific features of each of the embodiments of the hydrodynamic bearing assembly 100. .

The rotor 20 is a rotating structure rotatably provided with respect to the stator 40, and a rotor case having a ring-shaped magnet 26 corresponding to each other at predetermined intervals from the core 44 on the inner circumferential surface thereof. It may include.

In addition, the magnet 26 is provided as a permanent magnet in which the N pole and the S pole are alternately magnetized in the circumferential direction to generate a magnetic force of a predetermined intensity. The rotor 20 is rotated by the electromagnetic interaction between the coil 46 and the magnet 24.

Here, the rotor case is a hub 22 fixed to the upper end of the shaft 110 and extends radially outward from the hub 22 and bent downward in the axial direction to the magnet 26 of the rotor 20 It consists of a magnet support 24 for supporting.

The hub 22 is a lubricating fluid so as to protrude axially downward from the disc portion 22a and the disc portion 22a having a hollow in which the shaft 110 is inserted, and seal oil between the outer peripheral surface of the sleeve 120. It may include a cylindrical wall portion 22b to form a meniscus of the gas-liquid interface. In this case, the cylindrical wall portion 22b may be formed to have an inner circumferential surface inclined to taper the oil.

On the other hand, when defining the term for the direction, as shown in Figure 1, the axial direction refers to the up and down direction relative to the shaft 110, the radially inner (inner diameter) or outer (outer diameter) direction refers to the shaft 110 By reference to the outer end direction of the rotor 20 or the outer end of the rotor 20 means the center direction of the shaft 110. In addition, the circumferential direction may mean a direction of rotating along a predetermined radius about the rotation axis.

The stator 40 is a fixed structure including a winding coil 46 generating a predetermined magnitude of electromagnetic force when power is applied and a core 44 on which the winding coil 46 is wound.

The core 44 is fixedly disposed on an upper portion of the base 42 having a printed circuit board (not shown) on which a pattern circuit is printed, and on the upper surface of the base 42 corresponding to the winding coil 46. A plurality of coil holes having a predetermined size may be formed to expose the winding coil 46 downward, and the winding coil 46 may be electrically connected to the printed circuit board to supply external power.

The hydrodynamic bearing assembly 100 may include a shaft 110, a sleeve 120, a stopper plate 130, a hub 20, and a cover plate 140. The hub 20 may be configured to configure the fluid dynamic bearing assembly 100 while constituting the rotor 20.

3 to 5, the shaft 110 is inserted into a hollow portion formed in the central portion of the sleeve 120, and the stopper plate 130 is disposed at an axial upper portion of the sleeve 120, and a cover plate. 140 is disposed below the shaft 110 and the sleeve 120.

Here, the shaft 110 is inserted to have a hollow portion and a micro clearance 125 of the sleeve 120. The minute gap 125 is filled with oil (lubricating fluid), and the shaft 110 and its pressure are generated by a radial bearing formed in at least one of an outer diameter of the shaft 110 and an inner diameter of the sleeve 120. Rotation of the rotor 20 fixed to the top can be supported more smoothly.

In this case, at least one of an outer circumferential surface of the shaft 110 and an inner circumferential surface of the sleeve 120 may be formed with a spiral or herringbone shape groove, and the oil filled in the groove and the minute gap when the shaft 110 is rotated. The radial bearing is formed by the rotation of the shaft 110 can be smoothly supported.

In addition, the shaft 110 may include a stepped portion 112 that is caught on the lower surface of the inner diameter side of the stopper plate 130 to be described later. The step 112 may be provided in a stepped shape up and down in the axial direction. The stepped portion 112 may be engaged with an inner diameter surface of the stopper plate 130 to serve as a stopper for preventing over-injury of the shaft 110 and the rotor 20.

The cover plate 140 covers the lower portion of the sleeve 120 to support the sleeve 120 and the shaft 110. The cover plate 140 may be coupled to the outer circumferential surface by contacting the inner circumferential surface of the sleeve 120, and the bent portion formed such that the outer circumferential surface thereof is directed in the axial direction may be coupled to the inner circumferential surface of the sleeve 120. Oil may be accommodated in the gap between the cover plate 140 and the sleeve 120, and as such, may function as a bearing supporting the lower surface of the shaft 110.

The sleeve 120 has a hollow portion formed such that the shaft 110 is inserted into the center portion. In addition, the outer circumferential surface of the sleeve 120 is coupled to the base 42 of the stator 40 at the bottom. The outer circumferential surface of the sleeve 120 faces the cylindrical wall portion 22b of the hub 22 at the top. In this case, a gas-liquid interface (maniscus) 152 of a lubricating fluid (oil) may be formed between the upper portion of the outer circumferential surface of the sleeve 120 and the cylindrical wall portion 22b.

Spiral or herringbone grooves may be formed on the inner circumferential surface of the sleeve 120 to generate dynamic pressure between the shaft 110 and the shaft 110.

In addition, the upper and lower portions of the sleeve 120 may communicate with each other, and a bypass passage 122 may be formed to disperse the pressure of the oil (lubricating fluid). At this time, the communication unit 126 for communicating the bypass passage 122 with the outer surface of the sleeve 120 between the sleeve 120 and the stopper plate 130 disposed on the sleeve 120. ) May be provided.

The communication part 126 may be a first communication groove 127 formed on an axial upper surface of the sleeve 120 and communicating the bypass flow path 122 with an outer surface of the sleeve 120.

In addition, the communication portion 126 is formed on the upper surface of the axial direction of the sleeve 120 and the stepped gap portion 128 stepped axially downward from the radially inner side to the outer side with respect to the bypass flow passage 122 Can be. The stepped gap portion 128 may be provided on the front surface or a portion of the sleeve 120 along the circumferential direction.

Furthermore, as will be described below, the communication portion 126 is formed on the axial lower surface of the stopper plate 130 and has a second communication groove communicating the bypass passage 122 with the outer surface of the sleeve 120. (137).

On the other hand, the sleeve 120 may be provided with a fixing groove 124 on the radially inner upper surface. The fixing groove 124, as will be described in detail below, the fixing protrusion 131 which is provided in the radially inner side of the stopper plate 130 and protrudes downward in the axial direction may be fitted.

The fixing groove 124 may be continuously provided in the circumferential direction, and in this case, the fixing protrusion 131 may be continuously provided in the circumferential direction.

Here, the fixing protrusion 131 may be fitted into the fixing groove 124 by a coupling method such as press-fitting or slide. In addition, at the same time as the fitting bonding, bonding bonding by the application of the adhesive, various types of welding bonding can be made.

The sleeve 120 may be formed by forging Cu or Al, or sintering Cu—Fe alloy powder or SUS powder.

The stopper plate 130 may be fixedly coupled to the radially inner side of the sleeve 120 in the axial direction. The stopper plate 130 may include a fixing protrusion 131 protruding downward in the axial direction in the radially inner side. In addition, the entire upper surface of the sleeve 120 may be attached to the lower surface of the stopper plate 130.

The sleeve 120 and the stopper plate 130 may be coupled to each other by adhesive bonding, welding, or the like, in addition to the coupling by the fixing groove 124 and the fixing protrusion 131 described above.

A minute gap is formed between the inner circumferential surface of the stopper plate 130 and the outer circumferential surface of the shaft 110 so that oil may be filled as the lubricating fluid 150.

The stopper plate 130 protrudes radially inward from the inner circumferential surface of the sleeve 120 and includes a protrusion 132 that is caught by the stepped portion 112 formed on the outer circumferential surface of the shaft 110 when the shaft 110 rotates. can do. That is, the inner diameter of the stopper plate 130 may be smaller than the inner diameter of the sleeve 120.

When the shaft 110 rises due to the pressure of oil (lubricating fluid) during rotation of the shaft 110, the stepped portion 112 of the shaft 110 is caught by the protrusion 132 of the stopper plate 130 to prevent over-injury. Can be.

A thrust dynamic pressure generating groove 135 may be formed on an upper surface of the stopper plate 130, and oil may be provided as a lubricating fluid 150 between the disc portion 22a of the hub 22 and the upper surface of the stopper plate 130. Once filled, a thrust bearing can be formed.

Here, the thrust dynamic pressure generating groove 135 may be formed at any position on the upper surface of the stopper plate 130. In general, when the thrust dynamic pressure groove is formed on the upper surface of the sleeve, since the bypass flow path communicates with the upper surface of the sleeve, a position capable of forming the thrust dynamic pressure groove may be proposed. However, in the case of the hydrodynamic bearing assembly 100 according to an embodiment of the present invention, a stopper plate 130 is separately provided on an upper surface of the sleeve, and the bypass flow passage communicates with an upper surface of the stopper plate 130. The use of space to form a thrust dynamic pressure generating groove may vary. For example, the thrust dynamic pressure generating groove may be formed on at least one of a radially outer upper surface of the stopper plate and a lower surface of the hub corresponding thereto. Further, the thrust dynamic pressure generating groove may be formed radially outward from the sleeve upper surface communication portion of the bypass flow path formed in the sleeve.

The gap between the stopper plate 130 and the hub 22 and the gap between the sleeve 120 and the shaft 110 communicate with each other, and the oil injected into each of them can freely flow and circulate. That is, it is possible to form a bearing gap that is connected to the whole, and this structure is also referred to as a full-fill structure.

In an embodiment of the present invention, although the thrust dynamic pressure generating groove 135 is formed and described on the upper surface of the stopper plate 130, the present invention is not limited to this, but is formed on the lower surface of the disc portion 22a. Alternatively, the upper surface of the stopper plate 130 and the lower surface of the disc portion 22a may be formed.

In addition, the communication part 126 which communicates the bypass flow path 122 with the outer surface of the said sleeve 120 is formed in the axial lower surface of the stopper plate 130, and the said bypass flow path 122 It may be a second communication groove 137 in communication with the outer surface of the sleeve 120.

In addition, in this embodiment, the oil is taken as an example of the lubricating fluid, but the present invention is not limited thereto, and the friction between the fixed member and the fixed member can be reduced during rotation of the rotating member, so that the rotating motion can be stably supported. Of course, other fluids having

Hereinafter, the pumping groove 300, which is a thrust dynamic pressure generating groove, will be described with reference to FIGS. 6 and 7.

6 is a pattern diagram of a herringbone groove of a thrust dynamic pressure bearing formed in a stopper plate according to an embodiment of the present invention, Figure 7 is a spiral groove of the thrust dynamic pressure bearing formed in a stopper plate according to an embodiment of the present invention It is a pattern diagram.

The herringbone-shaped pumping groove 300 of FIG. 6 is formed by continuously herringbone groove 320 having an intermediate bent portion 340, and the spiral pumping groove 300 of FIG. 7 has a spiral groove 360 continuously. Is formed.

Looking at the hydrodynamic bearing structure generated when the motor including the hydrodynamic bearing assembly according to the present invention rotates, the outer peripheral surface and the sleeve of the shaft 110 during the rotation of the rotating member including the shaft 110 and the rotor 20 ( The radial bearing is formed by the pressure generated by the oil filled in the micro clearance 125 between the inner circumferential surfaces of the 120, and the upper surface of the stopper plate 130 and the lower surface of the hub 22, in particular of the disc portion 22a The thrust bearing is formed by the pressure generated by the oil filled in the micro clearances between the lower surfaces.

At this time, the outer peripheral surface of the sleeve 120 and the cylindrical wall portion of the hub 22 by pumping by the thrust dynamic pressure generating groove 135 formed on at least one of the upper surface of the stopper plate 130 and the lower surface of the disc portion 22a. The oil between 22b) is pumped to form a gas-liquid interface (maniscus) 152.

Since the stopper plate 130 is fixedly coupled to the upper portion of the sleeve 120 in the axial direction, a minute gap is formed between the inner circumferential surface of the stopper plate 130 and the outer circumferential surface of the shaft 110, and oil may be filled therein. . Therefore, the thrust bearing and the radial bearing can communicate.

On the other hand, since the oil may be filled in the bypass passage 122 formed to axially penetrate the sleeve 120 or the sleeve 120 and the stopper plate 130, the sleeve 120 by the oil pressure of the radial bearing The oil filled in the gap between the axial bottom surface of the cover plate 140 and the cover plate 140 may be moved into the bypass flow path 122.

At this time, the oil in the axial upper portion of the radial bearing may be moved into the bypass flow path 122 through the groove 124. When the bypass flow passage is formed to penetrate the stopper plate 130 and the sleeve 120 in the axial direction, the oil may be moved into the bypass flow passage through the thrust dynamic pressure generating groove 135.

According to the fluid dynamic bearing assembly and the motor including the same according to the present invention, since the rotating member is composed only of the shaft and the rotor, the weight of the rotating member is reduced, the impact resistance is improved, low current driving is possible, and the number of the rotating members is also reduced. Since the imbalance generated in the assembly process of the rotating body is reduced, the rotational precision may be improved.

Fig. 8 is a schematic cross sectional view showing a recording disk drive device equipped with a motor according to the present invention.

Referring to FIG. 8, the recording disk driving apparatus 800 equipped with the spindle motor 1000 according to the present invention is a hard disk driving apparatus, and includes a spindle motor 1000, a head conveying unit 810, and a housing 820. can do.

The spindle motor 1000 has all the features of the motor of the present invention described above, and can carry a recording disc 830.

The head transfer unit 810 may transfer the magnetic head 815 for detecting information of the recording disc 830 mounted on the spindle motor 1000 to the surface of the recording disc to be detected.

Here, the magnetic head 815 may be disposed on the support portion 817 of the head conveyance portion 810.

The housing 820 may cover a top of the motor mounting plate 822 and the motor mounting plate 822 to form an inner space for accommodating the spindle motor 1000 and the head transfer part 810. 824.

20: rotor 22: hub
24: magnet support 26: magnet
40: stator 42: base
44: core 46: winding coil
100: hydrodynamic bearing assembly 110: shaft
120: sleeve 130: stopper plate
140: Cover plate

Claims (19)

A sleeve into which the shaft is inserted;
A rotor coupled to an upper portion of the shaft and rotating together with the shaft; And
And a stopper plate fixedly coupled to a radially inner upper surface of the sleeve and preventing the floating of the shaft during rotation of the shaft. The method of claim 1,
And a dynamic pressure generating groove is formed in at least one of an upper surface of the stopper plate and a lower surface of the rotor corresponding thereto. 3. The method of claim 2,
And the dynamic pressure generating groove is formed in at least one of a radially outer upper surface of the stopper plate and a corresponding lower surface of the rotor. The method of claim 1,
And a gap is formed between the inner circumferential surface of the stopper plate and the outer circumferential surface of the shaft corresponding thereto to fill a lubricating fluid. The method of claim 1,
And an inner diameter of the stopper plate is smaller than an inner diameter of the sleeve. 6. The method of claim 5,
The shaft is a hydrodynamic bearing assembly comprising a step that is caught on the inner diameter lower surface of the stopper plate. The method of claim 1,
The rotor has a cylindrical wall portion extending downward in the axial direction,
And a gas-liquid interface of a lubricating fluid is formed between the inner side surface of the cylindrical wall portion and the outer side surface of the sleeve. The method of claim 1,
The sleeve has a bypass flow passage communicating the upper and lower surfaces in the axial direction,
And a communication portion communicating between the sleeve and the stopper plate, the bypass flow passage communicating with an outer surface of the sleeve. 9. The method of claim 8,
And the communication portion comprises: a first communication groove formed on an axial upper surface of the sleeve and communicating the bypass passage with an outer surface of the sleeve. 9. The method of claim 8,
And the communication portion comprises: a second communication groove formed at an axial lower surface of the stopper plate and communicating the bypass passage with an outer surface of the sleeve. 9. The method of claim 8,
And the communicating part is formed on an axial upper surface of the sleeve and is a stepped gap spaced axially downward in a radially inward to outward direction with respect to the bypass flow path. 9. The method of claim 8,
At least one of an upper surface of the stopper plate and a lower surface of the rotor corresponding thereto has a dynamic pressure generating groove formed at an outer side of an axial upper surface communication portion of the bypass flow path formed in the sleeve. The method of claim 1,
The stopper plate is provided to cover all of the upper surface of the sleeve hydrodynamic bearing assembly. The method of claim 1,
The stopper plate has a fixing protrusion projecting downward in the axial direction in the radially inner side,
The sleeve has a hydrodynamic bearing assembly having a fixing groove in which the fixing projection is fitted on the radially inner upper surface. 15. The method of claim 14,
The fixed protrusion and the fixed groove is a hydrodynamic bearing assembly provided continuously along the circumferential direction. 15. The method of claim 14,
The fixing protrusion is a fluid dynamic bearing assembly which is press-fit to the fixing groove. 15. The method of claim 14,
The fixing protrusion is a hydrodynamic bearing assembly bonded to the fixing groove by an adhesive. A rotor including a hub having a hollow in which a shaft is inserted, and a magnet support extending in an outer diameter direction from the hub and bent downward in an axial direction to support a magnet;
A bearing member including a sleeve for supporting rotation of the shaft and a stopper plate fixedly coupled to an upper surface in a radially inner upper surface of the sleeve and preventing the floating of the shaft during rotation of the shaft; And
And a stator positioned outside the sleeve, the stator including a core to which a winding coil is wound to generate a rotational driving force by electromagnetic interaction with the magnet. A spindle motor of claim 18 for rotating the disc by a power source applied through the substrate;
A magnetic head for recording and reproducing data of the disk; And
And a head conveyer for moving the magnetic head to a predetermined position on the disk.
KR1020120102154A 2012-09-14 2012-09-14 Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same KR20140035650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120102154A KR20140035650A (en) 2012-09-14 2012-09-14 Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120102154A KR20140035650A (en) 2012-09-14 2012-09-14 Hydrodynamic bearing assembly, spindle motor including the same and hard disk drive including the same

Publications (1)

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KR20140035650A true KR20140035650A (en) 2014-03-24

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