Dynamic pressure bearing assembly
US5372432A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1993 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Jul 16, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C33/1035
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A dynamic pressure bearing with a magnetic fluid sealed therein is reduced in size without degrading the bearing performance and includes a sleeve 5 having an insertion hole 6 axially formed therein fixed in a housing 1, and a pair of pole pieces 9a, 9b disposed with clearances defined between the opposed surfaces of the sleeve 5 and the housing 1. A shaft 7 is inserted in and fixed to the pole pieces 9a, 9b, and is disposed in the insertion hole 6 with a clearance defined therebetween, and a magnetic fluid 15 is sealed in these clearances, thus forming a dynamic pressure bearing assembly. The sleeve 5 is made of nonmagnetic material while the housing 1, shaft 7 and pole pieces 9a, 9b are made of magnetic material. A permanent magnet 2 is interposed therebetween to form magnetic fields in the clearances between the housing 1 and the pole pieces 9a, 9b, thus sealing the magnetic fluid 15 therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.