BALL BIT SHAFT OF DOWNHOLE MOTOR Russian patent published in 2002 - IPC

FIELD: drilling of deep wells with use of downhole motors. SUBSTANCE: ball bit body has stator members of radial bearings locked immovably with the help of shank and upper connecting sub; stator races of thrust bearing with Rockwell hardness of conical races equaling 49-53 units; stator distant rings of thrust bearing whose internal cylindrical surface is coated with vulcanized rubber layer; stator disc of labyrinth seal; stator distant rings of labyrinth seal. Rotor members of radial bearings are immovably locked to hollow shaft with the help of nut-coupling half. Rotor races of thrust bearing with hardness of surfaces of conical races equaling 52-57 units; rotor distance rings of thrust bearing; rotor discs of labyrinth seal. EFFECT: higher reliability due to high mean-time-between failures and prolonged service life. 2 cl, 3 dwg