Earth boring bit with pressure compensating metal face seal

Details Earth boring bit with pressure compensating metal face seal Earth boring bit with pressure compensating metal face seal

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) F16J 15/34 (2006.01)

Patent

CA 1215966

ABSTRACT OF THE DISCLOSURE An earth boring bit having a cantilevered bearing shaft and a compensator system to equalize the pressure of the lubricant with the hydrostatic pressure of the drilling fluid surrounding the bit. A rigid face seal assembly, positioned between the cutter and bearing shaft of the bit, moves axially in response to, and to compensate for, dynamic pressure changes in the lubricant adjacent the seal. This is accom- plished by the positioning and sizing of resilient energizer rings in relationship to the geometries of the mating grooves between the cutter and shaft and the rigid sealing rings of the face seal assembly.

457540

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