CN1120944C - Dynamic pressure type fluid bearing device - Google Patents
Dynamic pressure type fluid bearing device Download PDFInfo
- Publication number
- CN1120944C CN1120944C CN01800276A CN01800276A CN1120944C CN 1120944 C CN1120944 C CN 1120944C CN 01800276 A CN01800276 A CN 01800276A CN 01800276 A CN01800276 A CN 01800276A CN 1120944 C CN1120944 C CN 1120944C
- Authority
- CN
- China
- Prior art keywords
- dynamic pressure
- sealed department
- hollow shaft
- mentioned
- type fluid
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
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Classifications
-
- 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
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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
- 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
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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
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/026—Sliding-contact bearings for exclusively rotary movement for radial load only with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
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- 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
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
- H02K5/1677—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
-
- 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
- H02K7/086—Structural association with bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
Abstract
A dynamic pressure type fluid bearing capable of preventing lubricating oil from flowing out to the outside by exhausting air mixed into the bearing, wherein a thrust bearing (1) installed on a fixed shaft (2) is held spacedly by a sleeve (3) and a thrust plate (4) installed on one end side of the sleeve (3), asymmetrical herringbone-like dynamic pressure generating grooves (8a, 8b) are formed in at least either of the outer peripheral surface of the fixed shaft (2) and the inner peripheral surface of the sleeve (3), a first capillary seal part (7a) is formed between one end of the fixed shaft (2) and the sleeve (3), a second capillary seal part (7b) is formed between the other end of the fixed shaft (2) and the thrust plate (4), and an air bleeding groove part (9) is formed between the first capillary seal part (7a) and the second capillary seal part (7b).
Description
Technical field
The present invention relates to dynamic pressure type fluid bearing device.
Background technique
All the time, information apparatuss such as disk drive adopt the spindle drive motor that uses dynamic pressure type fluid bearing device, as: the spy opens flat 9-210054 communique and has announced the dynamic pressure type fluid bearing device that prevents oil leak.
Fig. 5 has shown present dynamic pressure type fluid bearing device.
But free rotary ground supporting is equipped with thrust plate 4 in the end as the hollow shaft 3 of axle on 2 of stationary axle, is the clamping of free unoccupied place to be installed in a thrust shaft 1 on spools 2 with hollow shaft 3 and thrust plate 4.Sealing plate 5 is pressed into the other end that is fixed on hollow shaft 3, at the inner face and 2 formation of the axle short space of sealing plate 5.Motor lining 6 is crimped on the outer circumferential face of hollow shaft 3.
1 of space, hollow shaft 3 and thrust plate 4 between the axle 2 and the inner peripheral surface of hollow shaft 3 and thrust bearing clearance filled has lubricant oil, for preventing oil leak, forms the 1st, the 2nd capillary sealed department 7a, 7B in the both end sides of bearing space.
That is: upper end portion and 2 on the axle at the inner peripheral surface of hollow shaft 3 is provided with V-shape the 1st capillary sealed department 7a that forms the conical surface vertically, is provided with the 2nd capillary autumn of the V-shape shape sealed department 7b that forms the conical surface vertically at thrust plate 4 and 2 of stationary axle.By the 1st, the 2nd capillary sealed department 7a, 7b are set, can utilize wicking that lubricant oil is retained in the bearing, from preventing oil leak.
At at least one face in the two of the inner peripheral surface of the outer circumferential face of axle 2 and the hollow shaft 3 relative with this outer circumferential face, be on the inner peripheral surface of hollow shaft 3 here, formation man type dynamic pressure occurrence groove 8a, 8b between the 1st capillary sealed department 7a and the 2nd capillary sealed department 7B.As shown in Figure 5, make its height consistent with hollow shaft 3, the position is traversing.
The shape of the dynamic pressure occurrence groove 8a of the radial bearing face on the inner peripheral surface of hollow shaft 3 is asymmetric, and the 10a of central bend portion of driven pressure occurrence groove 8a is long to the width B of end 10c from central curved part 10a to the width A ratio of end 10B.And this asymmetric dynamic pressure occurrence groove is formed at from thrust bearing 1 position farthest.Utilize this kind structure, the movement direction of the oil that produces owing to the imbalance of dynamic pressure is limited in the side by thrust bearing, and the liquid level position of lubricant oil is very stable between 10a, the 10b of dynamic pressure occurrence groove 8a.
Therefore, in the Hydrodynamic bearing device of above-mentioned structure, the rotation of motor makes the power of lubricant oil generation towards bearing centre, and the height of liquid level moves, liquid level stabilizing.
But in motor rotation time,, the lubricant oil liquid level will move to the position that dynamic pressure in dynamic pressure occurrence groove 8a, the 8B reaches balance, so the part of dynamic pressure occurrence groove 8a, 8b is exposed in the air, causes air easily to enter the dynamic pressure occurrence groove and enters in the bearing.
If the air trapping of sneaking in bearing, will produce the pressure of air and lubricant oil is extruded onto the outside, cause lubricant oil to flow out from opening portion.
Disclosure of an invention
The objective of the invention is to address the above problem, provide a kind of and the air of sneaking in the bearing can be discharged, prevents that flow of lubricant is to outside dynamic pressure type fluid bearing device.
The feature of dynamic pressure type fluid bearing device of the present invention is the outer surface formation air vent at stationary axle.
By the present invention, can discharge the air of sneaking in the bearing all the time, prevent that lubricant oil from flowing out.
Being configured to of the Hydrodynamic bearing device of technical solution of the present invention 1, at an end that is rotatably freely supported on the hollow shaft on the stationary axle thrust plate is installed, be installed in thrust bearing on the said fixing axle with above-mentioned hollow shaft and thrust plate clamping with a gap, in the inner peripheral surface of the outer circumferential face of said fixing axle and the hollow shaft relative, form asymmetric chevron dynamic pressure occurrence groove at least one face with this outer circumferential face, gap between stationary axle and hollow shaft inner peripheral surface, filling lubricant oil in the gap between above-mentioned hollow shaft and above-mentioned thrust plate and the above-mentioned thrust bearing, between end of said fixing axle and above-mentioned hollow shaft, form the 1st capillary sealed department that forms the conical surface vertically, between the other end of said fixing axle and thrust plate, form the 2nd capillary sealed department that axially forms the conical surface, it is characterized in that, be the scope that above-mentioned thrust bearing is installed between above-mentioned the 1st capillary sealed department and the 2nd capillary sealed department at least, outer circumferential face at the said fixing axle is provided with air vent vertically.By this structure, even entrained air in the lubricant oil also can drain into the outside with the air of sneaking into by air vent, so may command prevents that owing to the expansion that air temperature and variation in pressure cause flow of lubricant is to the outside.
The dynamic pressure type fluid bearing device of technical solution of the present invention 2 is in technological scheme 1, and slot part is located near the 2nd capillary sealed department one side.
The dynamic pressure type fluid bearing device of technical solution of the present invention 3 is in technological scheme 2, and slot part is extended down to the 2nd capillary sealed department.
Utilize this structure, be easier to the air of sneaking in the lubricant oil is discharged.
The dynamic pressure type fluid bearing device of technical solution of the present invention 4 is in technological scheme 1～3, and the length of the 2nd capillary sealed department is greater than the length of the 1st capillary sealed department.
By this structure, can increase the maintenance capacity of the lubricant oil of capillary sealed department, prevent that oil leak is to outside.
The simple declaration of accompanying drawing
Fig. 1 is the sectional view of the spindle drive motor of the dynamic pressure type fluid bearing device of use the invention process form 1.
Fig. 2 is the explanatory drawing of dynamic pressure occurrence groove that is formed at the axle of dynamic pressure type fluid bearing device shown in Figure 1.
Fig. 3 is the sectional view of the spindle drive motor of the dynamic pressure type fluid bearing device of use the invention process form 2.
Fig. 4 is the sectional view of the spindle drive motor of the dynamic pressure type fluid bearing device of use the invention process form 3.
Fig. 5 is the sectional view of the spindle drive motor of the present dynamic pressure type fluid bearing device of use.
The working of an invention form
Utilize Fig. 1～4 explanations each example of the present invention below.
Fig. 5 with the expression conventional case is played the parts of same purpose, and the mark prosign is illustrated.
Example 1
Fig. 1 and Fig. 2 represent example 1 of the present invention.
In this example 1, for preventing oil leak, be provided with air vent 9 at the peripheral part of axle 2, in addition, other structures are identical with the Fig. 5 that represents conventional case.
As shown in Figure 1, being configured in of dynamic pressure type fluid bearing device is rotatably freely supported on the distolateral thrust plate 4 that is equipped with as hollow shaft 3 on the axle 2 of stationary axle, that made by brass, is the clamping of free unoccupied place to be installed in a thrust bearing 1 of spools 2 with hollow shaft 3 and thrust plate 4.At the other end of hollow shaft 3, sealing plate 5 crimping are fixed on the axle 2, form short space between the inner peripheral surface of sealing plate 5 and spools 2.
The axle 2 that is fixed with thrust bearing 1 is inserted in the hollow shaft 3.Outer circumferential face crimping motor lining 6 at hollow shaft 3.
Inner peripheral surface at hollow shaft 3 forms lambdoid dynamic pressure occurrence groove 8a, 8b.
The dynamic pressure occurrence groove 8a that is located at upside as shown in Figure 2, the 10a of central bend portion of driven pressure occurrence groove 8a to the width A of end 10b greater than wide B from central curved part 10a to end 10c, be asymmetric shape.By this structure, lubricant oil produces the power towards the thrust bearing side from the bearing upper end portion, so the movement direction of the oil that restriction produces owing to the imbalance of dynamic pressure, the liquid level height of lubricant oil is stabilized in the kinetic pressure balancing position between 10a and 10b.
And clearance filled between the gap between the inner peripheral surface of axle 2 and hollow shaft 3, hollow shaft 3 and thrust plate 4 and thrust bearing 1 has lubricant oil.
Between the upper end portion of the inner peripheral surface of hollow shaft 3 and axle 2, be provided with V-shape the 1st capillary sealed department 7a that axially forms the conical surface, between thrust plate 4 and spools 2, be provided with V-shape the 2nd capillary sealed department 7b that axially forms the conical surface.By the 1st, the 2nd capillary sealed department 7a, 7b are set, produce the phenomenon that move to narrow position at lubricant oil liquid position leniently, promptly wicking can remain on lubricant oil bearing portion, prevents that oil leak is to outside.
On the outer surface of the axle 2 between the 1st capillary sealed department 7a and the 2nd capillary sealed department 7b, form a plurality of air vents 9.
By this structure, when motor rotated, lubricant oil produced power towards thrust bearing 1 direction of below, and liquid level height moves, liquid level stabilizing.At this moment, because the 10a of the driven pressure occurrence groove of liquid level height 8a moves to the kinetic pressure balancing position of 10b, so the part of dynamic pressure occurrence groove 8a is exposed in the air, air enters in the bearing.
But, in this example 1, owing to be provided with a plurality of air vents 9 at the outer circumferential face of axle 2, so the air of sneaking into can discharge from the 2nd capillary sealed department 7b by air vent 9 all the time.
Therefore, can prevent to sneak into lubricant oil and cause lubricant oil outflow owing to air.
But, the number of air vent 9 does not limit especially, can be odd number, can be majority yet.Shape does not limit yet.
Example 2
Fig. 3 represents example 2 of the present invention.
In this example 2, except that air vent 9 being extended to the 2nd capillary sealed department 7b, other structures are identical with above-mentioned example 1.
Like this, by air vent 9 being extended to the 2nd capillary sealed department 7b side, be easier to the air of sneaking in the bearing is discharged.
Example 3
Fig. 4 represents example 3 of the present invention.
In above-mentioned each example, the length of best the 2nd capillary sealed department 7b is longer than the length of the 1st capillary sealed department 7a.
That is to say, in dynamic pressure type fluid bearing device, make the motor rotation, lubricant oil axial thrust bearing direction is moved by the asymmetric chevron groove 8a that is located at radial bearing, making it to keep it stable, and keep mobile lubricant oil with the 2nd capillary sealed department.
For the air that will sneak into bearing also discharges from the 2nd capillary sealed department, the length of length d 2 to the 1 capillary sealed department d1 of the 2nd capillary sealed department 7b is long, preferably its 1.5～3 times, like this, just can increase the lubricant oil maintenance dose of the 2nd capillary sealed department 7b, can more effectively prevent the lubricant oil outflow.
In above-mentioned each example, dynamic pressure occurrence groove 8a, 8b are located on the inner peripheral surface of hollow shaft 3, but the present invention is not limited to this, also the dynamic pressure occurrence groove can be located at the axle 2 on, or the axle 2 and hollow shaft 3 both sides all establish, all can obtain same effect.
In addition, in above-mentioned each example, the difference in size of asymmetric dynamic pressure occurrence groove is 0.2mm, the 3um that is spaced apart of hollow shaft 3 and axle 2, and air vent 9 is 8, dark 0.3mm, wide 0.3mm.
From above-mentioned each example, can know and know, utilize dynamic pressure type fluid bearing device of the present invention, owing between end of stationary axle and hollow shaft, be provided with the 1st capillary sealed department, between the other end of said fixing axle and thrust plate, be provided with the 2nd capillary sealed department, the outer surface of the said fixing axle between above-mentioned the 1st capillary sealed department and the 2nd capillary sealed department is provided with air vent, so the air that enters in the bearing can be discharged all the time, prevent that flow of lubricant from arriving the outside.
In addition, by prolonging the capillary sealed department of exhaust side, can prevent that flow of lubricant from arriving the outside.
Claims (4)
1. dynamic pressure type fluid bearing device, end at the hollow shaft that is rotatably freely supported on stationary axle (2) (3) is equipped with thrust plate (4), there is the clamping of free unoccupied place to be installed in thrust bearing (1) on the said fixing axle (2) with above-mentioned hollow shaft (3) and thrust plate (4)
In the inner peripheral surface of the outer circumferential face of said fixing axle (2) and the hollow shaft (3) relative, be provided with asymmetric man type dynamic pressure occurrence groove at least one face with this outer circumferential face,
Be filled with lubricant oil in the gap between gap between the inner peripheral surface of stationary axle (2) and hollow shaft (3), above-mentioned hollow shaft (3) and above-mentioned thrust plate (4) and the above-mentioned thrust bearing (1),
Between end of said fixing axle (2) and above-mentioned hollow shaft (3), be provided with the 1st capillary sealed department (7a) that axially forms the conical surface, between the other end of said fixing axle (2) and thrust plate (4), be provided with the 2nd capillary sealed department (7b) that axially forms the conical surface
It is characterized in that, be scope that above-mentioned thrust bearing is installed at least between above-mentioned the 1st capillary sealed department (7a) and the 2nd capillary sealed department (7b), be provided with air vent (9) vertically at the outer circumferential face of said fixing axle (2).
2. dynamic pressure type fluid bearing device as claimed in claim 1 is characterized in that, above-mentioned groove (9) is located at a side of close the 2nd capillary sealed department (7b).
3. dynamic pressure type fluid bearing device as claimed in claim 2 is characterized in that, above-mentioned groove (9) is extended to the 2nd capillary sealed department (7b).
As claim 1 to each described dynamic pressure type fluid bearing device of claim 3, its feature just is that the length of the 2nd capillary sealed department (7b) is longer than the length of the 1st capillary sealed department (7a).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP46661/00 | 2000-02-24 | ||
| JP2000046661A JP2001234926A (en) | 2000-02-24 | 2000-02-24 | Dynamic pressure type fluid bearing device |
| JP46661/2000 | 2000-02-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1363022A CN1363022A (en) | 2002-08-07 |
| CN1120944C true CN1120944C (en) | 2003-09-10 |
Family
ID=18569035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01800276A Expired - Fee Related CN1120944C (en) | 2000-02-24 | 2001-02-19 | Dynamic pressure type fluid bearing device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2001234926A (en) |
| KR (1) | KR100480758B1 (en) |
| CN (1) | CN1120944C (en) |
| TW (1) | TW470825B (en) |
| WO (1) | WO2001063133A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248162A (en) * | 2012-02-01 | 2013-08-14 | 日本电产株式会社 | Motor and disk drive apparatus |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10200506A1 (en) * | 2002-01-09 | 2003-07-24 | Minebea Co Ltd | Method of manufacturing a spindle motor and spindle motor for a hard disk drive |
| JP4127036B2 (en) * | 2002-12-03 | 2008-07-30 | 松下電器産業株式会社 | Hydrodynamic bearing device and disk rotating device |
| CN100422583C (en) * | 2003-04-24 | 2008-10-01 | 松下电器产业株式会社 | Fluid bearing device and disk rotating device |
| WO2004094848A1 (en) | 2003-04-24 | 2004-11-04 | Matsushita Electric Industrial Co., Ltd. | Fluid bearing device and disk rotating device |
| JP4614740B2 (en) * | 2004-11-17 | 2011-01-19 | パナソニック株式会社 | Spindle motor |
| CN101225854B (en) * | 2007-01-17 | 2010-08-25 | 富准精密工业(深圳)有限公司 | Hydrodynamic bearing manufacturing method |
| KR101300338B1 (en) | 2011-07-22 | 2013-08-28 | 삼성전기주식회사 | Spindle motor |
| KR20130058955A (en) | 2011-11-28 | 2013-06-05 | 삼성전기주식회사 | Spindle motor and method for manufacturing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5806987A (en) * | 1996-02-07 | 1998-09-15 | Sankyo Seiki Mfg. Co., Ltd. | Hydrodynamic bearing apparatus |
| JPH11153130A (en) * | 1997-11-21 | 1999-06-08 | Sankyo Seiki Mfg Co Ltd | Dynamic pressure bearing device |
| JP3549380B2 (en) * | 1997-11-25 | 2004-08-04 | 日本電産株式会社 | Hydrodynamic bearing device and electric motor |
-
2000
- 2000-02-24 JP JP2000046661A patent/JP2001234926A/en active Pending
-
2001
- 2001-02-19 KR KR10-2001-7013619A patent/KR100480758B1/en not_active IP Right Cessation
- 2001-02-19 WO PCT/JP2001/001182 patent/WO2001063133A1/en active Application Filing
- 2001-02-19 CN CN01800276A patent/CN1120944C/en not_active Expired - Fee Related
- 2001-02-21 TW TW090103895A patent/TW470825B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248162A (en) * | 2012-02-01 | 2013-08-14 | 日本电产株式会社 | Motor and disk drive apparatus |
| CN103248162B (en) * | 2012-02-01 | 2015-07-15 | 日本电产株式会社 | Motor and disk drive apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| TW470825B (en) | 2002-01-01 |
| JP2001234926A (en) | 2001-08-31 |
| KR20020006711A (en) | 2002-01-24 |
| KR100480758B1 (en) | 2005-04-06 |
| CN1363022A (en) | 2002-08-07 |
| WO2001063133A1 (en) | 2001-08-30 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030910 Termination date: 20100219 |