Ball bearing for use in vacuum and turbo-molecular pump incorpor

Details Ball bearing for use in vacuum and turbo-molecular pump incorpor Ball bearing for use in vacuum and turbo-molecular pump incorpor

1991-02-27

1992-08-18

Smith, Leonard E.

Pumps

Motor driven

Electric or magnetic motor

384488, 384492, 3849071, 415 90, 41742313, F04B 3714, F16C 3361, F04D 1904

Patent

active

051393964

ABSTRACT:
A ball ball bearing for use in a vacuum is a sealed full-type ball bearing comprising an inner ring and an outer ring both made of stainless steel, balls made of a ceramic composed primarily of silicon nitride, and stainless steel shield plates. The bearing has enclosed therein a grease of low-volatility composition comprising a diester synthetic oil serving as a base oil, an organic condensation agent and an ethylene tetrafluoride resin additive.

REFERENCES:
patent: 4183592 (1980-01-01), Sudd et al.
patent: 4332522 (1982-01-01), Saulgeot
patent: 4827168 (1989-05-01), Nakajima
patent: 4957417 (1990-09-01), Tsuboi
patent: 4966552 (1990-10-01), Gonser
patent: 5028219 (1991-07-01), Schuetz et al.

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