Abstract: A cycloid transmission comprises a shaft having at least two eccentrics thereon, and a corresponding number of cycloid discs co-operating with respective ones of the eccentrics, with the shaft being mounted in a floating condition in the cycloid discs. The cycloid discs have raised portions at their outer radial peripheries, formed by a closed cycloid curve configuration, the raised portions engaging with rolling members carried by an outer ring member which may also form an outer casing of the assembly. Disposed on both axial sides of the cycloid discs are drive discs which support respective axial ends of drive pins that extend through bores in the cycloid discs. The outer ring member is supported on a bearing disposed at the outer periphery of the drive discs.

Abstract: A planetary gear arrangement which includes at least one planet wheel moved by way of an eccentric and at least one further wheel concentrically disposed with respect to the planet wheel. The planet wheel and further wheel are brought into engagement by a closed cam plate cycloid provided on one wheel and a ring of rollers provided on one wheel and a ring of rollers provided on the other wheel. The contact points of the rollers with the cam plate describe points of a reference cycloid with both the cam plate cycloid and the reference cycloid having a predetermined mathematical relationship.