SCREW HYDRAULIC MACHINE GEROTOR MECHANISM Russian patent published in 2004 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to gerotor mechanisms of downhole screw motors used at drilling of oil and gas wells, to screw pumps used in production of oil and transfer of liquids and to screw hydraulic motors of general application. Profiles of rotor and/or stator in their end face section are described as envelopes of generating rack formed by conjugation of arcs of circles at rolling of generating rack without sliding along corresponding circles, radii of arcs of circles of basic rack being calculated by definite equations. EFFECT: improved power characteristics, increased service life and manufacturability, reduced hydromechanical losses and cost. 2 cl, 8 dwg