Magnetic fluid bearing apparatus and motor having magnetic fluid bearing apparatus
US5108198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Jul 17, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/746
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sliding bearing an an end ring are mounted on a housing. A magnetic fluid sealing member comprises a permanent magnet and a magnetic fluid. A space is formed between the magnetic fluid sealing member and a lubricating fluid. A shaft has projection member or the end ring forms a spiral groove on an inner peripheral portion. The projection member of the shaft or the spiral groove of the end ring is disposed in an opposite position of the magnetic fluid sealing member. A magnetic fluid flow is disturbed by the projection member of the shaft or the spiral groove of the end ring according to a rotation of the shaft, then a magnetic fluid film is destructed instantaneously and the pressure at the space lowers. Air in the space is discharged from the housing. The scatter degree of the magnetic fluid is made slightly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.