Hydrodynamic bearing for use in an electric motor and an electric motor having the hydrodynamic bearing
US6066903A · kind A · utility
48Cited by
20References
34Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1999 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | Mar 15, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A spindle motor includes a stationary shaft and a rotor. A thrust bearing, a first radial bearing and a second radial bearing are defined between the shaft and rotor. A first annular air gap is established between the thrust bearing and the first radial bearing. A second annular air gap is established between the first radial bearing and the second radial bearing. The first annular air gap is able to vent to outside of the spindle motor via a breathing bore formed in a thrust plate of a stationary shaft. The second annular air gap is able to vent to outside the spindle motor only while the rotor is rotating about the shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.