Earth boring bit with improved two piece bearing and seal assembly
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United States of America Patent
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-
Feb 27, 1990
Grant Date -
N/A
app pub date -
Jun 23, 1988
filing date -
Jun 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An earth boring bit having an improved two piece bearing and seal assembly containing a cantilevered bearing lug that is threaded to receive a mating bearing sleeve, the lug having a transverse shoulder intersected by a mouth on the sleeve to define a bearing shaft upon which is supported a rotatable cutter. A lubrication system includes a hydrostatic pressure compensator and seal means, the transverse shoulder being positioned inwardly of the seal means toward an inner end region of the lug to avoid exposure of the transverse shoulder of the lug and the mouth of the bearing sleeve to ambient drilling fluid. The seal means is a rigid face seal assembly which includes a rigid, sealing ring and a resilient energizer ring.
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