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 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 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, and central longitudinal axes of rotor and lining are displaced relative to each other through value of eccentricity. Invention contains expressions and relations improving energy characteristics, mainly, developed power and torque, by providing maximum 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 values of radii of circumferences whose envelopes inscribe end face profiles of teeth in lining and rotor, thus providing reduction of hydromechanical losses owing to uniform tension in all phases of contact of lining and rotor teeth, improved sealing over contact lines in zones of poles of engagement and reduction of contact loads in zone of maximum sliding speed.

EFFECT: improved energy characteristics.

3 cl, 7 dwg