KR20120108191A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20120108191A
KR20120108191A KR1020110025807A KR20110025807A KR20120108191A KR 20120108191 A KR20120108191 A KR 20120108191A KR 1020110025807 A KR1020110025807 A KR 1020110025807A KR 20110025807 A KR20110025807 A KR 20110025807A KR 20120108191 A KR20120108191 A KR 20120108191A
Authority
KR
South Korea
Prior art keywords
lubricating fluid
sleeve
leakage
spindle motor
shaft
Prior art date
Application number
KR1020110025807A
Other languages
Korean (ko)
Inventor
양현기
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 KR1020110025807A priority Critical patent/KR20120108191A/en
Publication of KR20120108191A publication Critical patent/KR20120108191A/en

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Classifications

    • 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
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1446—Reducing contamination, e.g. by dust, debris
    • G11B33/1473—Reducing contamination, e.g. by dust, debris of/from bearings
    • 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
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/03—Machines characterised by thrust bearings

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  • Sliding-Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

PURPOSE: A spindle motor is provided to extend a leakage route of lubricant fluid through a lubricant fluid flow channel, thereby reducing of the amount of leaked lubricant fluid. CONSTITUTION: A fixing unit(120) includes a sleeve which supports a shaft to be rotatable. A rotating unit(140) rotates in connection with the shaft. A leakage preventing unit(160) is formed by the fixing unit and the rotating unit. The leakage preventing unit includes a surface of lubricant fluid with which a bearing gap is filled. A lubricant fluid flow channel(180) is formed on at least one of the fixing unit and the rotating unit. The lubricant fluid flow channel is arranged on the leakage preventing unit. The lubricant fluid flow channel lengthens a lubricant fluid leakage route to guide the lubricant fluid flow channel in a columnar direction.

Description

[0001] The present invention relates to a spindle motor,

The present invention relates to a spindle motor, and more particularly to a spindle motor having a bearing clearance filled with lubricating fluid.

Small spindle motors typically used in hard disk drives (HDDs) are equipped with a hydrodynamic bearing assembly and provide oil-like lubrication to bearing clearances formed between the shaft and sleeve of the hydrodynamic bearing assembly. The fluid is filled.

The oil filled in the bearing gap is compressed during rotation of the shaft to form a fluid dynamic pressure to rotatably support the shaft.

On the other hand, when an impact is applied from the outside, the lubricant can flow out from the bearing gap, that is, from the side forming the interface between the lubricant and air, to the outside of the bearing gap.

As such, when the lubricating fluid flowing out to the outside is scattered, the inside of the spindle motor is contaminated by the lubricating fluid.

In addition, when the lubricating fluid is leaked to the outside, the fluid dynamic pressure generated by the lubricating fluid is lowered, and eventually the performance of the spindle motor is lowered, and the service life is shortened.

An object of the present invention is to provide a spindle motor that can reduce the leakage of the lubricating fluid filled in the bearing gap by the external impact.

Spindle motor according to an embodiment of the present invention is filled in the fixed portion including a sleeve for rotatably supporting the shaft, the rotating portion rotated in conjunction with the shaft, the bearing gap formed by the fixed portion and the rotating portion The interface of the lubricating fluid is disposed and formed in at least one of the fixing part and the rotating part to be disposed in the leakage preventing part and the leakage preventing part formed by the fixing part and the rotating part, the lubricating fluid filled in the bearing gap is And a lubricating fluid flow channel guiding the flow path of the lubricating fluid along the circumferential direction to increase the length of the leaking leakage path and thereby reduce the leakage of the lubricating fluid from the bearing clearance.

The rotating part may include a thrust plate coupled to the shaft so as to be disposed above the sleeve.

The fixing part has a cap member installed on the sleeve to be disposed above the thrust plate, the leakage preventing portion is formed by the cap member and the thrust plate, the cap member for preventing leakage of lubricating fluid An inclined portion may be provided.

The lubricating fluid flow channel is formed on an inclined portion provided in the cap member, and may have a thread shape.

The rotor case may include an extension wall portion extending in the sleeve direction, the leakage preventing portion may be formed by the extension wall portion and the sleeve, and the extension wall portion may be provided with an inclination portion for preventing leakage of lubricating fluid. .

The lubricating fluid flow channel may be formed on an inclined portion provided in the extension wall portion.

According to the present invention, it is possible to reduce the leakage of the lubricating fluid by extending the leakage path of the lubricating fluid through the lubricating fluid flow channel through which the lubricating fluid flows.

1 is a schematic sectional view showing a spindle motor according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A of FIG. 1.
3 is a bottom perspective view showing a cap member according to an embodiment of the present invention.
4 is a schematic cross-sectional view showing a spindle motor according to another embodiment of the present invention.
5 is an enlarged view of a portion B of FIG. 1.
6 is a bottom perspective view showing a rotor case according to another 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 which fall within the scope of the inventive concept may be easily suggested, but are also included within the scope of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic cross-sectional view showing a spindle motor according to an embodiment of the present invention, Figure 2 is an enlarged view of a portion A of Figure 1, Figure 3 is a bottom perspective view showing a cap member according to an embodiment of the present invention.

1 to 3, the spindle motor 100 according to an embodiment of the present invention includes a fixing part 120, a rotating part 140, a leakage preventing part 160, and a lubricating fluid flow channel 180. Can be configured.

On the other hand, the spindle motor 100 according to an embodiment of the present invention may be a motor applied to the recording disk drive device for rotating the recording disk.

The fixing part 120 may include a sleeve 122 that rotatably supports the shaft 142.

That is, the fixing unit 120 means all fixing members except the rotating member, and the winding coil 128 wound around the sleeve 122, the base member 124, the stator core 126, and the stator core 126. ), And a cover plate 130.

The sleeve 122 rotatably supports the shaft 142 as described above, and when the shaft 142 is installed in the sleeve 122, the bearing gap is formed by the inner circumferential surface of the sleeve 122 and the outer circumferential surface of the shaft 142. (C) is formed.

That is, the inner circumferential surface of the sleeve 122 and the outer circumferential surface of the shaft 142 are spaced apart by a predetermined interval to form a bearing gap C, and the bearing gap is filled with lubricating fluid O.

In addition, a dynamic pressure groove (not shown) may be formed on an inner circumferential surface of the sleeve 122 to generate a fluid dynamic pressure when the shaft 142 rotates. Accordingly, fluid dynamic pressure is generated when the shaft 142 is rotated, so that the shaft 142 may be rotated more stably.

The lower end portion of the sleeve 122 may be indented to an upper side thereof, and an installation portion 122a may be provided to insert the cover plate 130.

Meanwhile, the sleeve 122 may be formed by forging Cu or Al, or sintering Cu—Fe alloy powder or SUS powder.

The base member 124 may include a sleeve housing 124a to which the sleeve 122 is fixedly installed. That is, the sleeve 122 is fixedly installed in the sleeve housing 124a of the base member 124, and an adhesive may be applied to the outer circumferential surface of the sleeve 122 and the inner circumferential surface of the sleeve housing 124a.

In addition, a stepped portion 124b on which the stator core 126 is installed may be provided on an outer circumferential surface of the sleeve housing 124a.

Meanwhile, the stator core 126 may be fixedly installed on the outer circumferential surface of the sleeve housing 124a by an adhesive or the like. For this purpose, the stator core 126 may include a core bag 126a having an opening through which the sleeve housing 124a penetrates. It may be composed of a tooth portion 126b extending from the core back.

In addition, the stator core 126 may be formed by stacking a plurality of cores pressed into sheets using a silicon steel sheet. However, the present invention is not limited thereto, and the stator core 126 may be formed through sintering.

The winding coil 128 is wound around the stator core 126, and may be wound around the tooth portion 126b in more detail.

In addition, the cover plate 130 may be fixedly installed on the mounting portion 122a of the sleeve 122 as described above. In addition, the cover plate 130 forms a bearing gap C together with the shaft 142 and the sleeve 122, and the bearing gap C is also filled with a lubricating fluid.

In addition, the cover plate 130 serves to prevent the lubricating fluid filled in the bearing gap (C) to leak to the lower side. On the other hand, the cover plate 130 may be fixed to the mounting portion 122a of the sleeve 122 by an adhesive or by welding.

The rotating unit 140 is rotated in conjunction with the shaft 142. That is, the rotating part 140 means all rotating members that rotate together with the shaft 142, and may include a shaft 142, a rotor case 144, a thrust plate 146, and a magnet 148. have.

Here, when defining terms for the direction, the axial direction refers to the up and down direction with respect to the shaft 142 as shown in Figure 1, the radial direction of the outer end direction of the rotor case 144 relative to the shaft 142 Or it means the center direction of the shaft 142 with respect to the outer end of the rotor case 144, the circumferential direction means the direction of rotation along the outer peripheral surface of the shaft 142.

The shaft 142 is rotatably installed in the sleeve 122, and when the rotor case 144 is rotated, the shaft 142 rotates in association with the rotor case 144. On the other hand, the shaft 142 may have a cylindrical shape, the rotor case 144 may be fixed to the upper end of the shaft 142.

The rotor case 144 may include a through hole 144a through which the shaft 142 penetrates, and a magnet coupling part 144b on which an inner surface of the magnet 148 is installed. That is, the rotor case 144 may have a cup shape in which a through hole 144a is formed at the center portion.

On the other hand, the thrust plate 146 is fixed to the shaft 142 to be disposed on the upper portion of the sleeve 122 is rotated with the shaft 142. In addition, the thrust plate 146 may be formed with a dynamic pressure groove (not shown) so that fluid dynamic pressure may be generated during rotation.

In addition, the bearing clearance C is formed by the thrust plate 146 and the sleeve 122, and the bearing clearance C is also filled with lubricating fluid.

The magnet 148 may have a ring shape, and may be a permanent magnet in which N poles and S poles are alternately magnetized in the circumferential direction to generate a magnetic force of a predetermined intensity. And, the magnet 148 is fixed to the magnet coupling portion 144b of the rotor case 144.

On the other hand, the magnet 148 is disposed opposite to the tip of the stator core 126, the winding coil 128 is wound, the rotor case 144 by the electromagnetic interaction of the magnet 148 and the winding coil 128 Is rotated.

In other words, when the rotor case 144 is rotated, the shaft 142 is rotated in conjunction with the rotor case 144.

As a result, the rotating part 140 including the rotor case 144 is rotated by the electromagnetic interaction between the magnet 148 and the winding coil 128.

The leakage preventing part 160 has an interface between the lubricating fluid and air filled in the bearing gap C formed by the fixing part 120 and the rotating part 140, and the fixing part 120 and the rotating part 140. Is formed by.

Meanwhile, the fixing part 120 may further include a cap member 132 installed on the sleeve 122 to be disposed on the thrust plate 146.

In addition, the leakage preventing part 160 may be formed by the cap member 132 and the thrust plate 146, and the leakage preventing part 160 may be formed to enlarge a cross-sectional area that opens toward the radially inner side.

To this end, the cap member 132 may be provided with an inclined portion (132a).

That is, the leakage preventing unit 160 may reduce the leakage of the lubricating fluid from the leakage preventing unit 160 by the capillary phenomenon.

The lubricating fluid flow channel 180 is formed in at least one of the fixing part 120 and the rotating part 140 to be disposed in the leakage preventing part 160, and increases a leakage path through which the lubricating fluid filled in the bearing gap C leaks. To guide the flow path of the lubricating fluid along the circumferential direction so as to reduce the leakage of the lubricating fluid from the bearing clearance C.

That is, the lubricating fluid flow channel 180 is formed on the inclined portion 132a of the cap member 132 and may have a thread shape.

In more detail, when the impact is applied from the outside, the lubricating fluid filled in the leakage preventing unit 160 may leak from the leakage preventing unit 160. At this time, the lubricating fluid flows along the surface of the cap member 132 or the thrust plate 146 forming the leakage preventing part 160.

However, the spindle motor 100 according to the embodiment of the present invention is provided with a lubricating fluid flow channel 180, and more specifically, a lubricating fluid flow channel having a threaded shape on the inclined portion 132a of the cap member 132. Since 180 is provided, the lubricating fluid flows along the lubricating fluid flow channel 180.

Therefore, the length of the leakage path of the lubricating fluid flowing out is increased, and eventually the lubricating fluid which cannot pass through the lubricating fluid flow channel is returned to the leakage preventing unit 160 to reduce the leakage of the lubricating fluid.

As described above, by extending the leakage path of the lubricating fluid through the lubricating fluid flow channel 180 through which the lubricating fluid flows, the leakage of the lubricating fluid may be reduced even when an external impact is applied.

Hereinafter, a spindle motor according to another embodiment of the present invention will be described with reference to the drawings. However, a detailed description of the same components as those described above will be omitted and replaced with the above description.

Figure 4 is a schematic cross-sectional view showing a spindle motor according to another embodiment of the present invention, Figure 5 is an enlarged view of the portion B of Figure 1, Figure 6 is a bottom perspective view showing a rotor case according to another embodiment of the present invention.

4 to 6, the spindle motor 200 according to another embodiment of the present invention includes a fixing part 220, a rotating part 240, a leakage preventing part 260, and a lubricating fluid flow channel 280. Can be configured.

On the other hand, the fixing unit 220 is substantially the same configuration as the fixing unit 120 provided in the spindle motor 100 according to an embodiment of the present invention described above will be omitted.

In addition, the rotating part 240 may include a shaft 242, a rotor case 244, and a magnet 248.

However, the shaft 242 and the magnet 248 is substantially the same configuration as the shaft 142 and the magnet 248 provided in the spindle motor 100 according to an embodiment of the present invention, a detailed description will be described here. It will be omitted.

Meanwhile, the rotor case 244 may be disposed radially outward from the outer circumferential surface of the sleeve 222, and may include an extension wall portion 244c extending downward from the bottom surface of the rotor case 244.

A bearing gap C is formed by the bottom surface of the rotor case 244 and the top surface of the sleeve 222, and the bearing gap C is filled with lubricating fluid.

In addition, the leakage preventing part 260 is formed by the extension wall portion 244c and the outer circumferential surface of the sleeve 222, the extension wall portion 224c may be provided with an inclined portion 244d for preventing the leakage of the lubricating fluid.

On the other hand, the lubricating fluid flow channel 280 is formed on the inclined portion 244d provided in the extension wall portion 244c to serve to reduce the leakage of the lubricating fluid from the leakage preventing part 260 during an external impact.

However, in the present embodiment, the case where the inclined portion 244d is formed on the extension wall portion 244c has been described as an example. However, the present invention is not limited thereto, and the extension wall portion 244c is not provided with the inclined portion 244d and the extension wall portion is provided. An inclined portion that is formed to be inclined on the sleeve 222 disposed to face the inner circumferential surface of 244c may be provided.

In this case, the lubricating fluid flow channel 2800 may be formed in the sleeve 222. That is, the lubricating fluid flow channel 280 may be any of the sleeve 222 or the extension wall part 244c forming the leakage preventing part 260. It may be formed in one or in all.

On the other hand, the spindle motor 200 according to another embodiment of the present invention is different from the spindle motor 100 according to an embodiment of the present invention in the formation position of the leakage preventing part 260 and the lubricating fluid flow channel 280. There are only the same in other configurations and effects.

100, 200: spindle motor 120, 220: fixed part
140, 240: rotating part 160, 260: leakage preventing part
180, 280: lubricating fluid flow channel

Claims (6)

A fixing part including a sleeve rotatably supporting the shaft;
A rotating part rotated in association with the shaft;
An interface of the lubricating fluid filled in the bearing gap formed by the fixing part and the rotating part, and a leakage preventing part formed by the fixing part and the rotating part; And
Lubricating fluid is formed on at least one of the fixing part and the rotating part to be disposed in the leakage preventing part, and the length of the leakage path through which the lubricating fluid filled in the bearing gap leaks increases to reduce the leakage of the lubricating fluid from the bearing gap. Lubricating fluid flow channel for guiding the flow path of the circumferential direction;
Spindle motor comprising a. The method of claim 1,
And the rotating part has a thrust plate coupled to the shaft so as to be disposed above the sleeve. The method of claim 2,
The fixing part has a cap member installed on the sleeve so as to be disposed on the thrust plate,
The leakage preventing part is formed by the cap member and the thrust plate, the cap member is provided with a spindle motor is provided with an inclined portion to prevent leakage of lubricating fluid. The method of claim 3,
The lubricating fluid flow channel is formed on an inclined portion provided in the cap member, the spindle motor having a threaded shape. The method of claim 1,
The rotor case has an extending wall portion extending in the sleeve direction,
The leakage preventing portion is formed by the extension wall portion and the sleeve, the extension wall portion is a spindle motor having an inclined portion for preventing the leakage of lubricating fluid. The method of claim 5,
The lubricating fluid flow channel is a spindle motor formed in the inclined portion provided in the extension wall.
KR1020110025807A 2011-03-23 2011-03-23 Spindle motor KR20120108191A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110025807A KR20120108191A (en) 2011-03-23 2011-03-23 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110025807A KR20120108191A (en) 2011-03-23 2011-03-23 Spindle motor

Publications (1)

Publication Number Publication Date
KR20120108191A true KR20120108191A (en) 2012-10-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110025807A KR20120108191A (en) 2011-03-23 2011-03-23 Spindle motor

Country Status (1)

Country Link
KR (1) KR20120108191A (en)

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