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Patent Searching and Data


Title:
BALL BEARING FOR VACUUM AND TURBO-MOLECULAR PUMP USED THE SAME
Document Type and Number:
Japanese Patent JPH03255215
Kind Code:
A
Abstract:

PURPOSE: To prolong the lifetime by making up a ball bearing for supporting a rotating body of inner and outer rings of stainless steel, balls made of ceramics whose main constituent is silicon nitride, and shield plates of stainless steel.

CONSTITUTION: A bearing 4 is an angular contact all-ball bearing consisting of an inner ring 11 in which a counter-bore is formed, an outer ring 12 in which no counter-bore is formed, balls 13, and shield plates 14 fitted in both end parts of the outer ring 12. The inner ring 11, the outer ring 12, and the shield plates 14 are made of stainless steel. The balls 13 are made of ceramics whose main constituent is silicon nitride. And between the inner ring 11 and the outer ring 12, glease made of low volatile matter or base oil of diester synthetic oil, for example, glease containing approximately 1% of organic coagulant such as bentonite and approximately 29% of tetrafluoroethylene resin additive that has good stability at high temperatures and is excellent in lubricity is filled.


Inventors:
Suzuki, Kazuya
Takii, Yuichi
Application Number:
JP1990000054497
Publication Date:
November 14, 1991
Filing Date:
March 05, 1990
Export Citation:
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Assignee:
KOYO SEIKO CO LTD
International Classes:
C10M169/04; F04D19/04; F16C19/16; F16C33/30; F16C33/32; F16C33/62; F16C33/66; C10N50/10; (IPC1-7): C10M169/04; C10N50/10; F04D19/04; F16C19/16; F16C33/32; F16C33/62; F16C33/66