DRILL BIT Russian patent published in 2018 - IPC E21B10/25 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to drilling equipment, namely to the roller bits of a rock drilling type. Drilling bit comprises the body with the inclined trunnions, on which the cutters with the annular boring are installed by means of the annular bearing and the sealing assemblies, which are located therein, each of which is formed by means of the elastic clamping ring and the package of rigid sealing rings, which are located with the radial clearance with respect to the walls of the annular boring of the cutter. Lateral surfaces of rigid sealing rings are reinforced with wear-resistant material with a different friction coefficient. Friction coefficient of rigid rings increases in the direction from the base of the trunnion to the axis of the bit.

EFFECT: technical result consists in improvement of drilling bit operation efficiency.

1 cl, 1 dwg