BEARING UNIT OF ROLLER CUTTER OF BORE BIT Russian patent published in 2011 - IPC E21B10/22 E21B10/24 

FIELD: oil and gas production.

SUBSTANCE: roller cutter is mounted on journal by bearing support allowing their mutual axial displacement eliminating effect of axial forces; packing between roller cutter and journal forms closed cavity filled with liquid functioning as cavity of hydraulic thrust bearing taking one-sided axial forces. Also, the cavity is refilled with liquid from open spring hydro-accumulator via a back valve. Descent of the roller cutter from the journal is restricted with a lock fixing device.

EFFECT: raised bearing ability of bearing support by taking only radial forces.

4 cl, 1 dwg