Compressible pressure compensator within closed lubricant...

Details Compressible pressure compensator within closed lubricant... Compressible pressure compensator within closed lubricant...

E - Fixed Constructions

21

B

184/44, 255/78

E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 33/72 (2006.01) F16C 33/76 (2006.01) F16J 15/40 (2006.01) F16N 11/10 (2006.01) F16N 19/00 (2006.01)

Patent

CA 1202954

COMPRESSIBLE PRESSURE COMPENSATOR WITHIN CLOSED LUBRICANT VOLUME OF AN EARTH BORING APPARATUS Abstract of the Disclosure A compressible pressure compensating member is disposed within a sealed lubricant volume enclosing a bearing and seal system of an earth boring apparatus. Lubricant is maintained within the volume by metal face seals so that both the bearing and the seal structure are lubricated thereby. As the lubricant expands, due to thermal expansion under use, the increased pressure is accommodated by compression of the compressible member so that no lubricant is expelled through the seals. When the lubricant cools and contracts, the compensator expands to maintain the lubricant volume at the initially filled level.

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