DRILLING BIT ROLLER CUTTER SUPPORT Russian patent published in 2018 - IPC E21B10/22 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to roller cone drill bits, in particular to roller bearing support. Drill bit support contains two radial roller bearings for the taking of radial drilling forces perpendicular to the roller cutter axis, supporting end strengthened surfaces of cutters and paws for perception of axial forces along the cutter axis, separated by intermediate antifriction washers, lock ball bearing to ensure the assembly of the support as a single unit, paws with trunnions for locating the rollers of radial bearings, which act as inner rings for the rollers of the radial bearings on which the flats are made in the area of the drilling force. On both pivots, the paws for placing the rollers of the large and small bearings are made as a part of a cylindrical surface on a sector of 100-130°. Depth of the flatten in the middle part and the radius of its arc are determined from the reduced mathematical expression.

EFFECT: technical result consists in the uniform loading of all the rollers in the zone of the drilling force, which leads to a reduction in the maximum contact stresses on the paw path and an increase in the fatigue life of the roller bearings.

1 cl, 2 dwg