Friction drive for high speed application - operates with ball bearings held between contoured friction rings with two contact points on each ring.

摘要

The ball bearings are held in a cage (4) between the two friction rings and with the contact surfaces of the rings comprising two profiles meeting at a mid plane. This provides two contact points per ring and has each ball bearing held between four contact points (A,B,C,D). The inner- and outer contact points are on common radii resulting in balanced input- and output torques for each ball bearing irrespective of the direction of thrust. The lines joining the points of contact on each friction ring intersect on the axis of the rings. The friction surfaces are provided by two curved profiles with radii greater than that of the ball bearing. USE/ADVANTAGE - Infinitely variable ratio drive with even torque control for wide range of speeds, friction control even in either direction.