DRILLING MOTOR WITH COUPLING ROTATING IN ONE DIRECTION Russian patent published in 2017 - IPC E21B4/02 E21B17/02 F16D41/12 

FIELD: engine devices and pumps.

SUBSTANCE: drilling motor assembly comprises a body, a spindle having a recess, a pawl adapted to be selectively engaged with the recess, the pawl having an axis of rotation and a generally flat contact surface which is adapted to engage with a flat contact surface of the recess, wherein the engaging contact surfaces of the pawl and the recesses are arranged at an angle to the radius passing from the axis of rotation to the engaging surfaces of the pawl and the recess. The pawl is rotatable about a pivot pin inserted into an elongated hole, such that the pivot pin is located at a distance from the body in the direction of the elongated part of the elongated hole cross-section, the pivot pin does not transmit torque between the body and the spindle while preventing relative rotation between the body and the spindle.

EFFECT: no perception of compressive force by the pawl pivot pins when transmitting torque from the spindle to the body.

31 cl, 5 dwg