ROLLING DRILLING BIT BEARING STRUCTURE Russian patent published in 2013 - IPC E21B10/25 

FIELD: mining.

SUBSTANCE: rolling drilling bit bearing structure includes an arm with a trunnion, on which a rolling cutter is installed by means of bearings, and a sealing element with a metal ring arranged in the rolling cutter groove. The bearing structure feature is that the sealing element on the side of one end is provided with a concentric annular slot for an annular metal element made from material with linear expansion coefficient that is larger than that of the trunnion and the rolling cutter material. At that, annular metal element in longitudinal cross section can be T-shaped; at that, transverse part of annular metal element is located on the side of the base arm face.

EFFECT: increasing service life of the bearing structure, improving its sealing reliability, especially at drilling in forced modes.

2 cl, 2 dwg