SPINDLE OF DOWNHOLE MOTOR Russian patent published in 2003 - IPC

FIELD: drilling equipment, drilling of oil and gas wells. SUBSTANCE: spindle has body, hollow shaft, radial and axial supports, sleeve coupling with windows for passage of flushing fluid through hollow shaft, upper sub and nipple. Hollow shaft is mounted in body for movement along axis. It also has hydraulic rest with repelling chamfer put on sleeve coupling beneath windows for passage of flushing fluid, is fitted with ring seals placed in recesses in body and nipple. Radial and axial supports are installed beneath hydraulic rest and are positioned between ring seals. EFFECT: reduced leak of flushing fluid into bearing units of spindle, decreased friction factor, prevented cracking and premature destruction of balls in axial supports. 4 cl, 1 dwg