Roller bearing in a deep-drilling apparatus

Details Roller bearing in a deep-drilling apparatus Roller bearing in a deep-drilling apparatus

2006-03-07

2006-03-07

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Plain bearing

C384S521000, C384S907100

Reexamination Certificate

active

07008113

ABSTRACT:
A ball-bearing unit for a bearing of a deep-drilling apparatus having bearing races made from steel with balls disposed therebetween. Contaminated drilling medium passes into the space between the bearing races. Load-bearing balls made from ceramic alternate with separating balls of smaller diameter made from steel between the bearing races to extend significantly the service life of the ball-bearing unit.

REFERENCES:
patent: 4872771 (1989-10-01), Ueno et al.
patent: 5904426 (1999-05-01), Tsuru et al.
patent: 6149311 (2000-11-01), Gabelli et al.
patent: 2002/0136476 (2002-09-01), Bouille
patent: 2527237 (1977-01-01), None

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