BEARING ASSEMBLY OF ROLLER-CUTTER DRILLING BIT Russian patent published in 1996 - IPC

FIELD: bearing assemblies of roller-cutter drilling bits provided with radial bearings between pin and roller cutter, and thrust bearings between pin end and roller cutter. SUBSTANCE: cylinder 6 in bearing assembly of roller-cutter drilling bit have radial grooves 15 on end surfaces and spiral grooves 14 on the external and internal surfaces. Direction of spirals coincides with direction of roller cutter rotation. Disks 7 have holes radial grooves 16 and axial grooves 17. Grooves 15 and 14 and also 16 and 17 are connected by pairs. Cylinders 6 are installed with partial overlapping each other on the side of end face of pin 2 for interaction of contacting surfaces. EFFECT: higher efficiency. 3 dwg