Hydrodynamic bearing apparatus and spindle motor having the same
US8641283B2 · kind B2 · utility
0Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2012 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Apr 11, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/1075
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
There is provided a hydrodynamic bearing apparatus, including: a shaft; and a sleeve rotatably supporting the shaft, wherein at least one of an outer surface of the shaft and an inner surface of the sleeve includes upper and lower hydrodynamic grooves generating hydrodynamic fluid pressure while the shaft rotates, and at least one of the upper and lower hydrodynamic grooves has a depth of a lower part thereof greater than that of an upper part thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.