STATOR OF SCREW GEROTOR MACHINE Russian patent published in 2009 - IPC E21B4/02 F04C2/107 F01C1/107 

FIELD: oil and gas production.

SUBSTANCE: invention is related to hydraulic drives for rotary drilling arranged in well. Stator comprises external pipe with internal surface made in the form of helicoid with internal screw teeth, elastomer facing fixed in external pipe and adjacent to internal surface of external pipe. Facing is made with internal screw teeth and matches in shape with internal screw teeth in external pipe, and facing thickness is maximum at teeth that are radially directed inside. In external pipe maximum thickness of facing along cavities of its internal screw surface arranged at maximum radial distance is equal to half of height of its internal screw teeth, at the same time minimum thickness of external pipe wall along cavities of its internal screw surface radially directed outside is equal to height of internal screw teeth in facing.

EFFECT: increased reliability and resource, and also provision of maximum power, force torque at output shaft in mode of maximum power and permissible axial load.

4 cl, 3 dwg