a power transmission system utilizes a pair of pulleys in spaced parallel relation interconnected by a plurality of endless drive belts . each pulley contains a plurality of eccentric drive lobes . the drive lobes have no teeth or means for increasing sliding friction between the lobes and each drive belt . drive belts contain no apertures or joints and may be constructed of multiple wraps of any fiber or filament . a plurality of drive lobes spaced equally , about a 360 - degree arc , link both shafts fully providing a smooth and even delivery of continuous turning force in either direction of rotation .