DRILLING BIT BEARING STRUCTURE Russian patent published in 2018 - IPC E21B10/22 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to a rock cutting tool, namely to the support of a drill roller cone bit. Support of the roller cutter includes a stepped pin, a bushing located between the pin and the roller cutter mounted on the pin by means of a lock bearing and a sliding bearing made with longitudinal grooves under tension rollers, mounted between the cutter and the bushing. Lower part of the journal between the tensioning rollers is formed with a groove having in the cross section the shape of an annular segment and intended to accommodate auxiliary support rollers mounted rotatably about its longitudinal axis. Floating sleeve is made of an elastic material.

EFFECT: technical result consists in increasing the efficiency of the support and the bit in general.

1 cl, 2 dwg