Title:
BEARING DEVICE, AND TURBO-MOLECULAR PUMP
Document Type and Number:
WIPO Patent Application WO/2008/015849
Kind Code:
A1
Abstract:
A protective bearing equipped with rolling elements of nonmagnetic body in which corotation of a magnetized inner ring is suppressed. An inner ring and an outer ring are formed of a member of magnetic body, respectively, and rolling elements are formed of nonmagnetic body. A magnetism inductor is a member formed of a magnetic material and has a function for inducing magnetism of a magnetized inner ring to a closed magnetic path passing the inner ring and the outer ring. A magnetism inducing portion is constituted of a part stretching out in the extending direction and the axial direction of a bearing fixing portion from the inner circumferential edge thereof, and touches the outer ring in order to reduce reluctance. The interval β of the clearance between the inner ring of the protective bearing and the magnetism inducting portion is set sufficiently smaller than the interval α of the clearance between the inner circumferential surface of the inner ring and the outer circumferential wall face of a shaft. Since the magnetism inductor is provided such that the interval β becomes smaller than the interval α, more magnetic fluxes can be picked up and induced to the closed magnetic path passing the inner ring and the outer ring.
More Like This:
Inventors:
KABASAWA TAKASHI (JP)
OKUDERA SATOSHI (JP)
OKUDERA SATOSHI (JP)
Application Number:
PCT/JP2007/062236
Publication Date:
February 07, 2008
Filing Date:
June 18, 2007
Export Citation:
Assignee:
BOC EDWARDS JAPAN LTD (JP)
KABASAWA TAKASHI (JP)
OKUDERA SATOSHI (JP)
KABASAWA TAKASHI (JP)
OKUDERA SATOSHI (JP)
International Classes:
F16C32/04; F04D19/04; F04D29/05; F04D29/056; F16C17/20; F16C33/32
Foreign References:
| JPH09210061A | 1997-08-12 | |||
| JP2001003890A | 2001-01-09 | |||
| JP2000274433A | 2000-10-03 | |||
| JP2005105846A | 2005-04-21 | |||
| JPH10176714A | 1998-06-30 |
Attorney, Agent or Firm:
NAKANO, Hitoshi et al. (12-8Nishishinjuku 8-chome,Shinjuku-k, Tokyo 23, JP)
Download PDF: