CONE BIT BEARING STRUCTURE Russian patent published in 2007 - IPC E21B10/22 

FIELD: rock-cutting tools, particularly cone bit bearing structure.

SUBSTANCE: cone bit comprises leg axle and cutter secured to leg axle by means of retaining bearing. The retaining bearing is made as two collars touching each other along spherical surface. Inner collar is connected to leg axle. Outer one is secured to cone bit. Outer collar is made as two rings touching each other by side surfaces thereof and rigidly connected with each other. Maximal inner ring diameter from the side of touching surfaces thereof exceeds outer diameter of inner collar, which is greater than minimal inner ring diameter. The rings are connected with each other by means of pin, screw or thread. Touching side surfaces of rings have mating extensions and depressions.

EFFECT: simplified bearing structure assemblage and improved performance characteristics of drilling operations.

3 dwg