Patent ID: 6656081
Filing Date: 2003-12-02
Classification: F16H

Abstract:
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 feedback structure connected to the ratio control element and including a ratio control valve to hydraulically control the traction roller assemblies, and a cam follower; a feedback cam cooperating with the cam follower; and a lost motion cam actuator between the predetermined pivot trunnion and the feedback cam to permit limited independent deflected movement of the predetermined pivot trunnion from the pivot axis thereof without requiring corresponding movement of the feedback cam.