CONE BIT BEARING (VARIANTS) Russian patent published in 2007 - IPC E21B10/00 

FIELD: rock-cutting tools, particularly cone drilling bits.

SUBSTANCE: cone bit bearing comprises axle with axial channel and end conical boring, milling cutter secured by means of retaining bearing member and compensator installed in axial axle channel. The compensator is provided with cylindrical stem and conical section congruent to the end conical boring. Axial axle channel and compensator stem have mating threads, which create screw pair with adjusting unit, which regulates compensator position with respect to axle. The adjusting unit is made as hollow stop disc coaxial to axle and fixedly secured to it and as spring arranged between the disc and compensator end. The compensator end is provided with groove. In accordance with another embodiment compensator is stepped and spring-loaded in axial direction. The compensator is installed in axle interior and may slide in axial direction under the action of well wall reaction force. Outer compensator stem end is parallel to bit axis and spaced a distance equal to bit radius from bit axis.

EFFECT: increased working ability.

3 c, 4 dwg