Fluid-Dynamic Bearing System

Patent metadata

Field	Value
Publication number	US-2016115995-A1
Application number	US-201514874590-A
Country	US
Kind code	A1
Filing date	Oct 5, 2015
Priority date	Oct 22, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

The invention relates to a fluid-dynamic bearing system comprising a stationary bearing component ( 12, 16, 18 ) and a bearing component ( 14, 14 a ) rotatable about a rotation axis, wherein, during operation of the hearing, the stationary and rotary components are separated from each other by a bearing gap ( 20 ) filled with a bearing fluid, wherein at least one fluid-dynamic radial bearing ( 22, 24 ) and at least one fluid-dynamic thrust bearing ( 28 ) or, alternatively, at least one conical fluid-dynamic bearing are arranged along the bearing gap ( 20 ), and wherein the bearing gap ( 20 ) comprises first and second open ends sealed by a first sealing gap ( 34 ) and a second sealing gap ( 36 ). According to the invention, the second sealing gap ( 36 ) exclusively extends normal to the rotation axis ( 40 ).

First claim

1 . A fluid-dynamic bearing system comprising a stationary bearing component ( 12 ; 16 , 18 ) and a bearing component ( 14 , 14 a ) rotatable about a rotation axis, wherein, during operation of the bearing, the stationary and rotary components are separated from each other by a bearing gap ( 20 ) filled with a bearing fluid, wherein at least one fluid-dynamic radial bearing ( 22 , 24 ) and at least one fluid-dynamic thrust bearing ( 28 ) or, alternatively, at least one conical fluid-dynamic bearing are arranged along the bearing gap ( 20 ), and wherein the bearing gap ( 20 ) comprises first and second open ends sealed by a first sealing gap ( 34 ) and a second sealing gap ( 36 ), characterized in that the second sealing gap ( 36 ) exclusively extends normal to the rotation axis ( 40 ).

2 . The fluid-dynamic bearing system according to claim 1 , characterized in that the first sealing gap ( 34 ) extends parallel to the rotation axis.

3 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ), with respect to the rotation axis ( 40 ), begins at a diameter a, extends radially outward, and ends at a diameter d.

4 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) is arranged between a surface, extending vertical to the rotation axis ( 40 ), of the stationary bearing component ( 18 ), and a surface, at least partially extending vertical to the rotation axis ( 40 ), of the rotary component ( 14 a ) and is at least partially filled with bearing fluid.

5 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section ab connected to the bearing gap ( 20 ), which begins at diameter a and ends at diameter b.

6 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section be beginning at diameter b and ending at a diameter c.

7 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section cd beginning at diameter c and ending at diameter d.

8 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section bb1 beginning at diameter b and ending at a diameter b1.

9 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section b1c beginning at diameter b1 and ending at a diameter c.

10 . The fluid-dynamic bearing system according to claim 1 , characterized in that the second sealing gap ( 36 ) comprises a section b2c beginning at diameter b2 and ending at diameter c.

11 . The fluid-dynamic bearing system according to claim 1 , characterized in that an opening of a recirculation channel ( 30 ) opens out into the section ab of the second sealing gap ( 36 ).

12 . The fluid-dynamic bearing system according to claim 11 , characterized in that a circumferential groove ( 60 ) is arranged in section ab of the second sealing gap ( 36 ).

13 . The fluid-dynamic bearing system according to claim 6 , characterized in that a dynamic pump seal ( 38 ) is arranged along section bc of the second sealing gap ( 36 ), characterized by pump grooves arranged on at least one of the surfaces defining section be.

14 . The fluid-dynamic bearing system according to claim 7 , characterized in that the third section cd of the second sealing gap ( 36 ) is formed as a conical capillary seal having a cross-section enlarged starting from diameter c up to diameter d.

15 . The fluid-dynamic bearing system according to claim 8 , characterized in that a dynamic pump seal ( 38 ) is not arranged along section bbl of the second sealing gap ( 36 ).

16 . The fluid-dynamic bearing system according to claim 9 , characterized in that a dynamic pump seal ( 38 ) is arranged along section bi c of the second sealing gap ( 36 ), which is characterized by pump grooves arranged on at least one of the surfaces defining section b1c.

17 . The fluid-dynamic bearing system according to claim 10 , characterized in that the gap width of section b2c of the second sealing gap ( 36 ) is larger than in the sections radially further inward.

18 . The fluid-dynamic bearing system according to claim 1 , characterized in that diameter a is equal to the inner circumference of the bore of the rotary bearing component ( 14 a ).

19 . The fluid-dynamic bearing system according to claim 1 , characterized in that diameter b is equal to the diameter on which the radially outermost area of the upper opening of the recirculation channel ( 30 ) is situated.

20 . The fluid-dynamic bearing system according to claim 1 , characterized in that diameter c is equal to the diameter at which the radially extending surface of the rotary bearing component ( 14 a ) transitions into a surface obliquely extending downwards.

21 . The fluid-dynamic bearing system according to claim 1 , characterized in that diameter d is equal to the outer circumference of the stationary bearing component ( 18 ).

22 . The fluid-dynamic bearing system according to claim 19 , characterized in that a diameter b1 is arranged between diameter b and a diameter c.

23 . The fluid-dynamic bearing system according to claim 20 , characterized in that a diameter b2 is arranged between diameter b1 and diameter c.

24 . A spindle motor having a fluid-dynamic bearing system according to claim 1 .

25 . The spindle motor according to claim 24 for driving a hard disk drive or a fan.

Assignees

• Minebea Co Ltd

Inventors

• Fuss Thomas
• Kirchmeier Tobias
• Vogt Oliver

Classifications

• F16C33/743

  retained in the sealing gap · CPC title

• F16C2370/12

  Hard disk drives or the like · CPC title

• F16C33/107

  Grooves for generating pressure · CPC title

• H02K5/1675

  radially supporting the rotary shaft at only one end of the rotor (H02K5/1677 takes precedence) · CPC title

• F16C33/745

  by capillary action · CPC title