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Downhole motor

Image Number 2 for United States Patent #6230823.

A downhole hydraulic motor consisting of an outer rim having six or eight lobes on the toothed inner surface, a rotor having four or six lobes respectively on the toothed outer surface as well as a number of planetary gears being constantly engaged with both the outer rim and the rotor and dividing the space between the rim and the rotor into a number of working chambers changing their volume with the rotation of the motor. The working fluid is supplied to the working chambers through channels both in the rotor and the side covers, one of which can slide inside the outer rim to allow adjustment of the gap between the ends of the planetary gears and the side covers.

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