HYDRAULIC DOWNHOLE MOTORS WITH THRUST BEARING WITH INCREASED TORQUE Russian patent published in 2020 - IPC E21B4/02 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to well drilling. Hydraulic downhole motor comprises a drive shaft configured to rotate the drill bit, thrust bearing is connected with drive shaft and comprises unitary element of inner cage, which contains multiple spaced along axis of inner cages, located around outer surface of unitary element of inner cage and set of rolling elements, arranged in each inner cage of multiple inner cages. Each inner holder is enclosed in appropriate separate element of outer cartridge securing set of rolling elements in every inner cartridge. Each element of outer shell is made of two parts and between two outer race parts there is space, in which there is separate support element.

EFFECT: transmission of higher torque as compared to currently used thrust bearings and reduction of failures during drilling, such as cracking of drive part, which contains thrust bearing, and discontinuities of outer diameter of drive part caused by torsional movement between holders of thrust bearings.

14 cl, 5 dwg