ROLLER BIT BEARING Russian patent published in 2012 - IPC E21B10/25 

FIELD: mining.

SUBSTANCE: invention relates to rock cutting tools, particularly, to roller cutter bearings. Roller cutter bearing comprises journal with seal fitted thereon and roller cutter locked by lock bearing. Proposed bearing is provided with bush made from material with lower liner expansion factor compared with that of journal and roller cutter material. Note here that said bush has groove made on its outer surface to receive said seal. In compliance with another version, bush has annular bead on inner surface while bush has annular groove on outer surface.

EFFECT: higher reliability and longer life.

2 cl, 2 dwg