DRILLING BIT BEARING STRUCTURE Russian patent published in 2012 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: drilling bit bearing structure includes inclined trunnion provided with axial lubrication supply channel and roller cutter installed on trunnion by means of locking bearing; at that, it is equipped with locking bearing unloading assembly made in the form of liquid wedge diaphragm arranged on lubrication movement way. As per the first version, liquid wedge diaphragm is formed with conical surface made on end section of trunnion and cylindrical surface of roller cutter cavity. As per the second version, liquid wedge diaphragm is formed with conical surface made on end section of internal surface of roller cutter and cylindrical surface of end section of trunnion.

EFFECT: increasing operating efficiency of locking bearing, bearing structure and bit as a whole.

4 cl, 5 dwg