ROLLING DRILLING BIT BEARING STRUCTURE Russian patent published in 2014 - IPC E21B10/25 

FIELD: mining.

SUBSTANCE: invention refers to a rock-destructing tool, and namely to bearing structures of rolling drilling bits. A rolling drilling bit bearing structure includes a trunnion, a rolling cutter fixed on the trunnion with a retaining bearing with a retainer against axial movement, and a sealing assembly with an O-ring, which is arranged at the trunnion bottom, and with a metal bushing made from spring steel, which is arranged inside it. The metal bushing of the sealing assembly is made in the form of a corrugated cylinder arranged in an O-ring cavity so that it can be turned; corrugations of the metal bushing have the shape of a sine curve and are located parallel to the trunnion axis.

EFFECT: enhanced stability of a bearing structure by improving its sealing reliability.

2 dwg