HYDRAULIC DOWNHOLE MOTOR Russian patent published in 2019 - IPC E21B4/02 F04C2/107 F01C1/107 

FIELD: machine building.

SUBSTANCE: invention relates to hydraulic drives for rotary drilling located in a well. Elastomer cover, fixed in tubular housing of hydraulic downhole motor, is made with asymmetric arrangement of its surface profile with internal helical teeth, contacting with helical teeth on outer surface of rotor, relative to profile of its surface adjacent to inner helical teeth in tubular housing, and includes first and second sides of each helical tooth of the elastomer plate such that the geometry of the first side of the lining adjacent to the side surface of the inner helical tooth of the tubular body forms a sealing surface with helical teeth on the outer surface of the rotor and is made with a maximum thickness of the lining, and the geometry of the second side of the lining adjacent to the side surface of said inner helical tooth of the tubular body forms a loading surface and is made with minimum thickness of the lining.

EFFECT: increased service life and reliability, accuracy of driving at drilling of directed wells, rate of set of parameters of well curvature, and also improved cross-country capacity, id est reduced resistance and stress in assembly of drill string bottom.

3 cl, 9 dwg