Rotary cone bit with improved thrust bearing

Details Rotary cone bit with improved thrust bearing Rotary cone bit with improved thrust bearing

E - Fixed Constructions

21

B

E21B 10/22 (2006.01) F16C 19/30 (2006.01)

Patent

CA 2394212

An improved rotary cone bit includes a drill bit body having two or more leg portions extending from one end of the drill bit body. Formed integrally with each of the leg portions is a bearing pin that extends inwardly toward the longitudinal axis of the drill bit body and includes a circumferential shelf formed proximal to the distal end of the pin. On each of the bearing pins there is rotatably mounted a cutter cone that includes an internal shelf formed to mate with the circumferential shelf of a respective bearing pin. Positioned between the circumferential shelf of the bearing pin and the internal shelf of the cutter cone is a thrust bearing having a plurality of cylindrical rollers positioned in a retainer ring. The thrust bearing transfers forces generated on the cutter cone by conventional drilling action to the distal end of the bearing pin.

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