SCREW HYDRAULIC GEROTOR MOTOR Russian patent published in 2008 - IPC F03C2/08 E21B4/02 F01C1/107 

FIELD: oil and gas producing industry.

SUBSTANCE: invention relates to gerotor mechanisms of multistart screw hydraulic motors in which rotor with bit is rotated by fluid medium delivered by pump which are used in drilling oil and gas wells. Proposed screw hydraulic gerotor motor has stator in form of tubular housing with fitted on elastomer, for instance, rubber lining with internal helical teeth, and rotor arranged eccentrically inside stator with external helical teeth whose number is less by one than number of teeth of lining, pitches of helical teeth of lining and rotor are proportional to number of their teeth, end face profiles of lining and rotor are formed by common basic rack with displacement, and profile of said contour is inscribed by equidistant shortened cycloid. Invention contains expressions and relations improving energy characteristics, mainly developed power and torque by providing larger cross section area occupied by working medium at equal contour diameter, value of eccentricity of engagement in mechanism, number of teeth of lining and rotor owing to optimization of value of circumference generatrix radius.

EFFECT: improved energy characteristics.

3 cl, 8 dwg