ROCK BIT SUPPORT Russian patent published in 2011 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: rock bit support comprises a journal made as a whole with a leg and having grooves for lubricant supply, and a cutter fixed on the journal by means of sliding bearings in the form of a floating bushing and a retaining rolling bearing. The feature of the proposed support is the fact that the journal for the rolling bearing has a conical collar near the base, and there is a bush with a conical end at the opposite end of the journal. Tops of conical surfaces face each other and are arranged on the journal axis, at the same time the conical surfaces are made with the identical taper angle, and the floating bush is arranged at the ends with response conical sections, length of which makes (0.1-0.2) of the bush length.

EFFECT: reduced specific load at a rolling bearing, which results in increased service life.

1 dwg