BOREHOLE HELICAL MOTOR Russian patent published in 2014 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to borehole helical motors. This motor consists of two, tope and bottom sections. Each of the latter comprises screw working members built around multistart gerotor mechanism with internal cycloidal engagement. Spindle with output shaft runs in axial and radial bearings. Hinge joint of rotor helical working members with output shaft and fluid passages. Helical working members stator of top section is fixed at drilling string. Bottom section output shaft is coupled with rock cutting tool. Top section output shaft is rigidly coupled with bottom section helical working member stator fitted in adapter bore coupling fixed bodies of spindles and concentrically spinning in adapter radial bearing.

EFFECT: enhanced power characteristics, particularly, higher output shaft rpm.

2 cl, 5 dwg