DOWNHOLE MOTOR AND DRIVE ASSEMBLY THEREOF (EMBODIMENTS) Russian patent published in 2024 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: group of inventions relates to hydraulic drives for rotary drilling, placed in a well. Downhole motor drive assembly comprises a connecting shaft, at least a first flexible multi-section constant velocity hinge attached to a first end of the connecting shaft, and a mandrel in working connection with at least a first flexible multi-section hinge of equal angular speeds, so that when a rotational force is applied to the connecting shaft, the rotational force is transmitted to the mandrel. First flexible multi-section hinge of equal angular velocities comprises at least a first upper element having a longitudinal hole, an upper attachment section for attachment to the first end of the connecting shaft and a lower connecting section with a row of splines and recesses, at least a first middle element having a longitudinal opening, an upper connecting portion with a row of splines and recesses corresponding to a lower connecting portion of the at least first upper member, and a lower connecting portion with a row of splines and recesses, at least a first lower element having a longitudinal hole, an upper connecting portion with a row of splines and recesses corresponding to lower connecting section of at least first middle element, and at least a first connecting pin extending through the longitudinal holes of the upper element of the at least first middle element and the lower element for coaxial installation and securing of elements during use.

EFFECT: invention is aimed at improvement of design of downhole motors.

20 cl, 15 dwg