BOTTOM-HOLE MOTOR Russian patent published in 1998 - IPC

FIELD: bore-hole drilling machinery and equipment. SUBSTANCE: this is used for bringing bit to rotation in drilling bore-holes. located in hollow of body of bottom-hole motor is rotor. Chamber is created between outer surface of rotor and inner surface of body. Rotor has radial holes arranged along spiral line, and seated in aforesaid holes are sealing pistons. Arranged in inner space of rotor is flexible hermetic sleeve which by its lower part rests on end wall of rotor at liquid outlet side. Flexible sleeve by its front part at liquid inlet side is rigidly connected with front end of rotor. Flexible hermetic sealing ensures reliable tightness of rotor spiral surface relative to body walls. EFFECT: high efficiency. 2 dwg