Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1987-03-09
1988-06-28
Suchfield, George A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175372, 175359, 277 83, 277 84, 277 91, 277 92, 384 95, E21B 1020
Patent
active
047533030
ABSTRACT:
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. 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 minimize axial seal movement relative to cutter and shaft during drilling to enhance seal life. A threaded bearing lug receives an internally threaded bearing sleeve. The journal bearing surface is approximately midway between the shaft seal groove, a portion of which is on its bearing sleeve and another portion on the cutter seal groove.
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Felsman Robert A.
Hughes Tool Company--USA
Letchford John F.
Suchfield George A.
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