Fluid dynamic-pressure bearing, spindle motor and recording disk driving device
US7374340B2 · kind B2 · utility
2Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2005 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Aug 29, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid dynamic-pressure bearing includes a thrust dynamic-pressure bearing between a bearing member and a rotor hub and a tapered sealing portion continuous with the thrust dynamic-pressure bearing and defining a radial gap whose width gradually increases in the axial direction. A neck is formed in a passageway between the thrust dynamic-pressure bearing and a lubricating fluid/air interface maintained in the tapered sealing portion for increasing flow resistance of the lubricating fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.