FIELD: drilling technology. SUBSTANCE: this can be used for drilling horizontal holes. Device has main motor and additional motor. Body of device is connected by adapter with rotating stator of additional motor. Rotor of additional motor by means of tube and spindle shaft is connected with drilling string. Located inside adapter, rotor, and flexible tube is hydraulic distributor unit which is made up of two pistons interconnected by rod. Lower end of rod is provided with cam-type half-coupling. Mating half-coupling is located on end of adapter. Upper piston is connected with flexible tube by means of splined joint. Rod in upper part has seat for seating of throwing-off member which is made in the form of cylinder. Openings are made in adapter and flexible tube for passing liquid. EFFECT: high efficiency. 1 cl, 1 dwg
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