Hydrodynamic bearing device, spindle motor including the same, and recording and reproducing apparatus
US7478951B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2006 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Mar 10, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A cylindrical sleeve is rotatably fitted over a fixed shaft erected on a base, the sleeve including an outer collar part at an outer periphery of the lower end portion thereof, a slip-out preventing member for preventing the slip-out from the fixed shaft while allowing the sleeve to rotate is provided on the base, the slip-out preventing member including an inner collar part that engages with the outer collar part in the slip-out direction. A hub is provided on the upper end portion of the sleeve, a pair of upper and lower radial bearings formed with a dynamic pressure generating groove are provided on the inner peripheral surface of the sleeve, and a thrust bearing formed with a dynamic pressure generating groove is provided at the lower end face of the sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.