Traction drive with slip control and method of controlling the slip

Abstract

A traction drive transmits power between an input shaft and an output shaft through a friction drive that includes an input disc, an output disc and a plurality of traction rollers. A slip speed occurs between the discs and the traction rollers which is maintained within a predetermined range which is limited by the coefficient of traction of the fluid on the surface of the discs and rollers. The angle of the rollers relative to the discs is recorded and the offset of the rollers relative to the one to one ratio is calculated from data including the speeds of the input and output discs and the traction rollers. The determination of the offset is made at a zero torque transmission condition. This offset is used to determine the appropriate normal force to be applied to the discs and roller interface to maintain the slip speed in the predetermined range when torque is being transmitted.

Dependencies are inferred from the claim text.