Roller bearing in a deep-drilling apparatus
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United States of America Patent
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Mar 7, 2006
Issued Date -
N/A
app pub date -
Dec 19, 2002
filing date -
Dec 19, 2001
priority date (Note) -
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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.
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