OMNI-WHEEL, FRICTIONAL PROPULSION DEVICE AND OMNI-DIRECTIONAL VEHICLE

Provided is an omni-wheel including an annular core member for rotatively supporting a plurality of free roller that is light, economical and strong. The omni-wheel comprises an annular core member (32) having at least one junction (A) defined by mutually circumferentially opposing ends (35) thereof, a plurality of sleeve members (36) defining an inner bore (38) and passed onto the core member and a free roller (60) rotatably supported on an outer surface of each sleeve member in a coaxial relationship, wherein the mutually opposing ends of the annular core member at each junction are fitted into either end of the inner bore of the corresponding sleeve member.