Title:
DYNAMIC PRESSURE BEARING AND SPINDLE MOTOR
Document Type and Number:
WIPO Patent Application WO/2000/065246
Kind Code:
A1
Abstract:
A long-life spindle motor bearing which can prevent a swing of shaft due to oscillation during rotation, a reduction in rotating accuracy and a contact between the shaft and a bearing, and provide a high rotating accuracy, wherein the shaft (11) and a sleeve (12) are inclined by an external energizing force relatively to each other to utilize a dynamic pressure produced on a bearing part when they are rotated relatively to each other, a cylindrical surface (C) in parallel with the axis of the sleeve (12) is provided at the center part of the sleeve (12) and two tapered parts (A) and (B) diverging toward the outside are provided at both end parts of the cylindrical surface (C) continued to these tapered parts (A) and (B) to produce a dynamic pressure between the tapered parts (A) and (B) at both end parts and the shaft (11), the inclinations of the tapered parts (A) and (B) are made identical to that of the shaft (11) and the lengths of the tapered parts (A) and (B) should desirably be 1/4 or more of the length of the sleeve (12), the same effect being enabled also by forming the sleeve (12), to the contrary, in cylindrical shape, and providing a flat part (e) and tapered parts (a) and (b) at the center and on both sides of the outer peripheral part of the shaft (11), respectively.
Inventors:
OTSUKI MAKOTO (JP)
KOMURA OSAMU (JP)
MURABE KAORU (JP)
KOMURA OSAMU (JP)
MURABE KAORU (JP)
Application Number:
PCT/JP2000/002627
Publication Date:
November 02, 2000
Filing Date:
April 21, 2000
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
OTSUKI MAKOTO (JP)
KOMURA OSAMU (JP)
MURABE KAORU (JP)
OTSUKI MAKOTO (JP)
KOMURA OSAMU (JP)
MURABE KAORU (JP)
International Classes:
F16C23/04; F16C33/10; F16C33/24; F16C17/02; G11B19/20; H02K7/08; H02K7/09; (IPC1-7): F16C17/10; F16C33/24; H02K7/08
Foreign References:
| JPH05332354A | 1993-12-14 | |||
| JPH02149784A | 1990-06-08 | |||
| JPH0373721U | 1991-07-24 | |||
| JPH0925930A | 1997-01-28 | |||
| JP2000170749A | 2000-06-20 | |||
| JPH05105192A | 1993-04-27 | |||
| JPS5536456U | 1980-03-08 | |||
| JPH1118357A | 1999-01-22 | |||
| JPH1155918A | 1999-02-26 | |||
| JPH1137157A | 1999-02-09 |
Other References:
See also references of EP 1098096A4
Attorney, Agent or Firm:
Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)
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