Rotary rock bit with improved thrust flange

E - Fixed Constructions – 21 – B

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E21B 10/22 (2006.01) E21B 10/24 (2006.01)

Patent

CA 1162183

ROTARY ROCK BIT WITH IMPROVED THRUST FLANGE Abstract of the Disclosure A rolling cone cutter earth boring bit is provided having a pair of facing thrust bearing surfaces, one such surface on the rolling cone and the other surface on the journal pin. The latter surface defines an annular groove which has separate arcuate segments thereof filled with a hardfacing material and machined to provide a complimentary engaging surface with the cone thrust bearing surface. The spaces in the groove between the hardfacing segments define pockets providing lubricant reservoirs and debris traps for the immediately adjacent thrust bearing surfaces.

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