Rotary cone drill bit with enhanced journal bushing
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United States of America Patent
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-
Jul 17, 2001
Grant Date -
N/A
app pub date -
Jan 25, 1999
filing date -
Jan 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention allows the load carrying capability of a drill bit journal bearing or bushing to be increased. The present invention increases the length of the journal bushing by using the ball bearings to retain the journal bushing at a desired location between the journal and the cutter cone assembly. Normally, the journal bushing is retained by a flange formed on the interior surface of the cutter cone assembly. In the present invention, this flange is removed, and the ball bearings are used as a retention device for the journal bushing. With the flange removed, the length of the journal bushing may be increased.
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