SPIRAL BOTTOM-HOLE MOTOR FOR DIRECTIONAL DRILLING Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: motor has power section with its rotor and torsion bar interconnected in their upper part, spindle section with its body connected with power section body by adapter unit. Motor is provided with pivoted unit kinematically connected with free end of torsion bar and spindle section. Pivoted unit is made in the form of coupling located with its upper part in hole of torsion bar, half-coupling with hole in which seated is lower part of coupling. Also included in pivoted unit are two pins located in two interperpendicular planes and seated in holes made in torsion bar, coupling and half-coupling. Holes in torsion bar and half-coupling in which coupling is seated and also ends of coupling are made with tapered sections. EFFECT: high efficiency. 3 dwg