Compressible pressure compensator within closed lubricant volume

Details Compressible pressure compensator within closed lubricant volume Compressible pressure compensator within closed lubricant volume

1983-08-26

1985-04-09

Novosad, Stephen J.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

175371, 384 93, 384 94, E21B 1024

Patent

active

045096074

ABSTRACT:
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.

REFERENCES:
patent: 1532178 (1925-04-01), Godbold
patent: 2187037 (1940-01-01), Kirkpatrick
patent: 2611668 (1952-09-01), Douglass
patent: 3419093 (1968-12-01), Lichte et al.
patent: 3844364 (1974-10-01), Crow
patent: 3866716 (1975-02-01), Matson
patent: 4182425 (1980-01-01), Garrett
patent: 4261426 (1981-04-01), Garrett
patent: 4287957 (1981-09-01), Evans
patent: 4335791 (1982-06-01), Evans

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