Earth boring bit with improved rigid face seal assembly

Details Earth boring bit with improved rigid face seal assembly Earth boring bit with improved rigid face seal assembly

E - Fixed Constructions

21

B

255/78

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

Patent

CA 1244400

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. The positioning of the seal groove and seal assembly in relation to the bearing surface is such that rigid face seal movement is decreased relative to axial cutter movement during drilling to enhance seal life. Preferably the ratio of rigid ring movement to axial cutter movement is substantially one half to one.

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