TURBODRILL-REDUCTION GEAR Russian patent published in 2003 - IPC

FIELD: mining, particularly, equipment for drilling oil and gas wells, more specifically, downhole motors. SUBSTANCE: turbodrill-reduction gear has three independent interconnected sections: lower section - bit shaft; middle section - reduction gear; and upper section - turbine. Turbodrill-reduction gear is made so that driving and driven shafts of reduction gear section are locked in radial and axial positions in false body having distance pieces with the help of rotary members of radial bearings and radial-thrust bearings locked in its turn in body of reduction gear section by double nipple sub. Driving shaft has nut-carrier to whose eccentric trunnion, internal gear-wheel is secured and connected with driving shaft by means of double-slider coupling and bit shaft seal is throttle. In this case, stator members of throttle seal of bit shaft, stator holders of pivot and their distant rings are locked in body of bit shaft section with the help of nipple nut. Rotary bushings of shaft throttle seal, pivot, rotary holders and their distance rings are locked on bit shaft with the help of nut-coupling. In this case, chord of blades profile of stator stages of turbine section has direction of left-hand screw, and chord of blades profile of rotor stages has direction of right-hand screw. EFFECT: increased efficiency and service life. 4 cl, 6 dwg