Assembly method of motor using magnetic lubrication fluid
US6574186B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Jun 27, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A conventional plain bearing, in which dynamic pressure is generated by means of lubricating oil, has been assembled in such a way that the whole bearing device is assembled and then the lubricating oil is poured in the interior. As a result, residual air bubbles are produced to cause lowering of the dynamic pressure. The present invention uses magnetic fluid as lubricating oil, and adopts, for enclosing the fluid, a method in which at the time of assembling a spindle motor, a permanent magnet is used, magnetic fluid of a specified amount is previously held in a bearing unit by the magnetic attraction force, and after the insertion of a shaft, the magnetic fluid is supplied into a narrow space of a bearing part by a capillary attraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.