VOLUME TYPE ENGINE WITH RADIALLY LIMITED ROTOR ENGAGEMENT Russian patent published in 2016 - IPC E21B4/02 F03C2/08 F04C2/107 

FIELD: mining.

SUBSTANCE: group of inventions relates to well drilling. Assembly of drilling unit, which comprises assembly of downhole motor, comprising upper adapter, containing collar, with first inner diameter near distal end of upper adapter, and working pair including screw motor with stator and rotor, made capable to eccentric rotation at passage of drilling mud through engine, and having near end and distal end, near end of stator being attached to distal end of upper adapter; engagement of rotor comprises shaft with near end and distal end, and eccentrically rotating by means of transmission of eccentric rotor gear; distal end of shaft is directly or indirectly attached to near end of rotor; and shaft extends from distal end of rotor engagement to upper adapter at some distance past collar, wherein at least part of shaft extending past collar has outer diameter less than first inner diameter of collar; near end of shaft has effective outer diameter larger than first inner diameter, and/or is attached to assembled rotor engagement, containing one or more parts, which have effective outer diameter larger than first inner diameter; at least one device arranged between near end and distal end of shaft of rotor engagement, which allows limiting radial and/or tangential movement of shaft of rotor engagement, and by means of transmission through shaft to restrict radial and/or tangential motion of rotor; external shaft of engine directly or indirectly attached to near end of rotor; drilling bit, directly or indirectly attached to distal end of external shaft of engine.

EFFECT: higher engine efficiency is provided.

26 cl, 17 dwg