SCREW HYDRAULIC MACHINE HELICAL GEAR ROTATION MECHANISM Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to helical gear rotation mechanisms of screw downhole motors, screw downhole motors, screw pumps and general-purpose screw hydraulic motors. Cycloidal profiles of one half rotor tooth and one half of stator tooth in end face section are described by equidistant curve of curtate cycloid, and corrected profiles of other half of rotor tooth and other half of stator tooth in end face section are obtained as envelopes of reference profile of conjugate rack formed by conjugation of arcs of circumferences at running over reference profiles without slipping along corresponding diameters. Radius of one of circumferences forming reference profile is equal to radius of equidistant curve, and radius of other circumference is defined by mathematical expression. Invention improved performance characteristics and reliability of mechanism and increases its service life, making it possible to assemble working members without selection and to manufacture rotor and die core by one tool. EFFECT: improved reliability and increased service life. 7 dwg