Ratio control for toroidal-type traction drive incorporating lost motion cam actuator

A ratio control for a toroidal-type traction drive, comprising:

• toroidal discs defining a toroidal cavity;
• traction roller assemblies having pivot trunnions rotatably supporting traction rollers disposed in the toroidal cavity and engaged between the toroidal discs, each of the pivot trunnions having a pivot axis, the pivot trunnions including a predetermined pivot trunnion;
• a ratio control element positionable to establish various ratios between the toroidal discs;
• a linkage having one end portion connected to the ratio control element, an opposite end portion connected to a cam follower, the linkage having a third portion between the one and the opposite end portions;
• a ratio control valve connected to the third portion of the linkage to hydraulically control the traction roller assemblies;
• a feedback cam cooperating with the cam follower;
• and
• a lost motion cam actuator between the predetermined pivot trunnion and the feedback cam, the lost motion actuator including pin and guide means for permitting limited independent deflected movement of the predetermined pivot trunnion from the pivot axis thereof without requiring corresponding movement of the feedback cam.