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A traction drive of planetary configuration includes a cone, a pair of cups surrounding the cone, transfer rings located between the cone and the cups, and a cage that positions the transfer rings. The cone is unitary and has a pair of raceways which are presented outwardly and taper downwardly towa

A traction drive of planetary configuration includes a cone, a pair of cups surrounding the cone, transfer rings located between the cone and the cups, and a cage that positions the transfer rings. The cone is unitary and has a pair of raceways which are presented outwardly and taper downwardly toward each other. The two cups have tapered raceways which are presented inwardly toward the cone raceway. The transfer rings on their peripheral surfaces are tapered and slightly crowned. The cage includes end disks which lie beyond the ends of the transfer rings and studs which connect the end disks and further serve as journals for the transfer rings, thus maintaining the rings at equal circumferential intervals. The two cups are held together, and springs, either at the rollers or along the cups, urge the tapered raceways of the cone and cups and the tapered peripheral surfaces of the transfer rings snugly together. The spring force is supplemented with an axial force derived from the torque transferred by the drive. Power may be applied at the cone or at the cups or at the cage, and may be delivered at either of the remaining two components.

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A traction drive comprising: a cone having a pair of raceways which are located around a center axis and taper downwardly toward each other so that the raceways have their least diameters where they are closest; a pair of cups located around the cone and concentric to the cone about the center axis,

A traction drive comprising: a cone having a pair of raceways which are located around a center axis and taper downwardly toward each other so that the raceways have their least diameters where they are closest; a pair of cups located around the cone and concentric to the cone about the center axis, each cup having a tapered raceway, with the raceway of the one cup being located opposite one raceway of the cone and the raceway of the other cup being located opposite the other raceway of the cone, the raceways of the two cups having their greatest diameters where they are closest; transfer rings located between the cone and cups and having peripheral surfaces which are tapered and contact the raceways of the cone and the cups; and a cage having annular end disks located beyond the ends of the transfer rings and are also located between the cone and the cups such that the end disks are exposed at the ends of the traction drive but do not project axially beyond the cone or the cups, the cage also having axles located between and attached to the disks, the axles extending through the transfer rings to establish remote axes about which the rings revolve, the cage further having bearings located within the transfer rings and around the axles to enable the transfer rings to rotate about the remote axes.