DOWNHOLE DRILLING MOTOR WITH CONCENTRIC ROTARY DRIVE SYSTEM Russian patent published in 2017 - IPC E21B4/02 E21B17/02 F16D41/12 

FIELD: mining.

SUBSTANCE: rotary drive for fluid medium has the first and the second housing, at that the second housing is made rotatable relatively and inside the first housing, forming between them the gap for the working fluid medium. The gates are supported by the first housing, and the second housing has the blades. The pockets for the gates are formed in the first housing, the gates, when in contact with the blades, are displaced into them by turning on the pitch hinge. The gates and the pockets for the gates are mutually configured to form between them the cavity for the foreign particles, capable to contain temporarily the solid foreign particles, included in the working fluid. Each gater has the surface, facing the associated pocket for the gate and having the series of protruberances, at that the gaps between the adjacent protruberances form the flow path in the pocket for the gate. The working fluid can pass through each flow path in the pocket for the gate into the gap for the working fluid, when the corresponding gate is displaced into the associated pocket for the gate to the maximum.

EFFECT: total gates displacement and obtaining wide ranges of the torque and rotation speed.

28 cl, 20 dwg