Fluid dynamic pressure bearing and recording disk drive device comprising the same
US7380989B2 · kind B2 · utility
1Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2005 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Sep 10, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a radial minute gap between a substantially columnar shaft and an inner peripheral face of a substantially cylindrical sleeve, oil is retained and a radial dynamic pressure bearing is formed. A plurality of recessed portions are arranged in a circumferential direction on at least one of an outer peripheral face of the shaft and the inner peripheral face of the sleeve and a first hill portion is provided to an axial end portion of each the recessed portion. Thus, it is possible to achieve a dynamic pressure bearing with which sufficient radial shaft support can be obtained in spite of a short axial length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.