KR20120108191A - Spindle motor - Google Patents
Spindle motor Download PDFInfo
- 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
Links
Images
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
Landscapes
- Sliding-Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
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
On the other hand, the
The
That is, the
The
That is, the inner circumferential surface of the
In addition, a dynamic pressure groove (not shown) may be formed on an inner circumferential surface of the
The lower end portion of the
Meanwhile, the
The
In addition, a
Meanwhile, the
In addition, the
The
In addition, the
In addition, the
The rotating
Here, when defining terms for the direction, the axial direction refers to the up and down direction with respect to the
The
The
On the other hand, the
In addition, the bearing clearance C is formed by the
The
On the other hand, the
In other words, when the
As a result, the
The
Meanwhile, the fixing
In addition, the
To this end, the
That is, the
The lubricating
That is, the lubricating
In more detail, when the impact is applied from the outside, the lubricating fluid filled in the
However, the
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
As described above, by extending the leakage path of the lubricating fluid through the lubricating
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
On the other hand, the fixing
In addition, the
However, the
Meanwhile, the
A bearing gap C is formed by the bottom surface of the
In addition, the
On the other hand, the lubricating
However, in the present embodiment, the case where the
In this case, the lubricating fluid flow channel 2800 may be formed in the
On the other hand, the
100, 200:
140, 240:
180, 280: lubricating fluid flow channel
Claims (6)
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.
And the rotating part has 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 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 lubricating fluid flow channel is formed on an inclined portion provided in the cap member, the spindle motor having a threaded shape.
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 lubricating fluid flow channel is a spindle motor formed in the inclined portion provided in the extension wall.
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
ID=47279828
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) |
-
2011
- 2011-03-23 KR KR1020110025807A patent/KR20120108191A/en not_active Application Discontinuation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WITN | Withdrawal due to no request for examination |