the eccentric rolling-mechanism gearheads known as cycloidal reducers are a type of servo gearing that has an input shaft that drives a bearing assembly. this in turn drives a cycloidal disc (sometimes called a cam) that connects to an output shaft. the cam has lobes or teeth that engage with a cam follower typically with pin or needle bearings. the eccentric cam rotation induces rotation of an output shaft at a lower speed and higher torque than the input.

    Because of the pin-and-gear structure, cycloidal gearing maintains continuous and distributed power-transmission contact for higher shock resistance than traditional reducers. In fact, some variations can withstand transitory exposure to quadruple their rated torque. High torque density makes for ratios to 185:1 in reasonable gearbox footprints.