Title: In-drum drive and speed reducer

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Abstract: An electric motor for rotatably driving a drum is stationarily disposed within the drum and provided with a pair of bearing surfaces eccentrically and oppositely disposed relative to the center of the motor shaft to which the bearing surfaces are coupled, each eccentric bearing surface supporting an externally toothed wheel having a predetermined number of peripheral teeth engageable with an output ring secured to the inner cylindrical surface of the drum, the output ring having a predetermined greater number of internal teeth than the predetermined number of external teeth of the toothed wheels. Each toothed wheel is provided with a plurality of equally spaced-apart apertures disposed along a common radius from the associated bearing surface, the corresponding apertures of each wheel being restrained rotationally by a roller passing therethrough and carried by a shaft forming a part of the stationary frame structure supporting the motor, the diameter of each aperture being equal to the diameter of its restraining roller plus twice the eccentric distance between the center of the bearing surface and the center of the motor shaft, whereby each revolution of the motor shaft will produce an eccentric non-revolving motion of the toothed wheels to thereby rotate the drum a distance equal to the excess of the number of teeth in the output ring over the number of teeth in the toothed wheels.


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