HYDRAULIC DOWNHOLE MOTOR Russian patent published in 2009 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to hydraulic drives of rotary drilling units located in holes and can be used in hydraulic screw motors and turbo drills designed to drill inclined and horizontal oil and gas holes. Proposed motor comprises housing with rotor arranged there inside to revolved by forced feed of working fluid. It comprises also spindle shaft fitted on axial support representing radial thrust multi-row bearing, and in upper and lower sliding bearings. It includes a threaded adapted jointed to motor spindle housings. Spindle shaft comprises fishing collar and is linked up with rotor. Spindle housing thread accommodates a nut attached thereto and furnished with fishing belt. Spindle shaft features a centering flange and thread arranged right between lower radial bearing and shaft extension. Aforesaid fishing flange is made in fishing ring fitted on the spindle shaft centering flange. Nut fishing belt features the grooves with their width and diametre exceeding those of fishing ring. Nut inside has circular space accommodating with fishing belt grooves. Note that circular space exceeds diametre of fishing flange of fishing rings.

EFFECT: longer life, higher reliability.

3 cl, 4 dwg