DRILLING ROCK BIT Russian patent published in 2013 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: drilling rock bit comprises legs with inclined journals, displaced in plan in parallel to the bit axis, and conical roller cutters installed onto them by means of a lock bearing with milled or cast teeth. In all roller cutters at least some crowns are made with slant teeth, besides, slant teeth are inclined to the axis of the journal so that the total axial component of the face reaction to the axis of rotation of the bearing unit in each roller cutter is directed towards the axis of the bit. The angle of inclination of cutting edges of slant teeth to the roller cutter generatrix may amount to 10-30°, at the same time the smaller value of the inclination angle complies with the smaller value of the journal inclination angle to the bit axis.

EFFECT: invention provides for unloading of a lock bearing, higher resistance and efficiency of a support and a bit as a whole.

2 cl, 3 dwg