Fluid dynamic bearing thermal compensation
US6731456B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Jul 9, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S384/905
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hub and shaft are provided which are mounted for relative rotation by providing two conical bearings spaced apart along the shaft, and a bearing seat facing each conical bearing. Fluid is maintained in the gap between each cone and the facing bearing seat, supporting the cone and seat for relative rotation. The outer surface of the bearing seat is insulated from the remainder of the motor by a thermal insulator which extends at least part way along the outer surface of the seats. This insulator is effective at keeping the bearings warm even in a relatively low temperature environment in which the motor may be used. The insulator may comprise a cylindrical ceramic or similar low thermal conductivity material extending at least part way along the axial distance outside of the bearing cones. Alternatively, an air space may be defined in the outer surface of the bearing seat, extending at least part way between the bearing cones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.