DRILLING BIT BEARING STRUCTURE Russian patent published in 2008 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: invention concerns rock destruction tool. Particularly it concerns drilling bit bearing structures. Bit bearing structure contains claw with inclined pin and crusher, installed on pin by means of bearings, one of which is claw. At that link rail of pin and crusher for each frictionless bearing is made of material with different friction ratio, at that friction ratio of couple: crusher - rolling element is more then of couple: pin - rolling element.

EFFECT: life time increasing offering structure at the expense of decreasing probability of bearing rolling element jamming.

1 dwg