Bearing equipment for vacuum devices
US4955731A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/1035
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bearing for a vacuum device having an annular permanent magnet disposed about a rotatable shaft which has one end exposed to low pressure and the other end exposed to atmospheric pressure in which the rotatable shaft has a spherical member formed on the high pressure end for mating with a concave bearing surface having a magnetic fluid interposed therebetween and the rotatable shaft has a plurality of grooves formed thereon for aligning with a plurality of rings formed on an annular pole piece in which a magnetic fluid is disposed between the rings and grooves, which can be formed on the shaft, for providing a high pressure seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.