Toroidal type continuously variable transmission

Abstract

A toroidal type continuously variable transmission comprises input and output discs coaxially and rotatably arranged about a common axis. The input and output discs have respective toroidal concave surfaces which face each other. Power rollers are arranged each having a rounded outer surface and being interposed between the toroidal concave surfaces of the input and output discs. A loading cam is provided that presses the input disc against the power rollers by a force that is proposal to an input torque. Trunnions are provided each supporting the corresponding power roller in such a manner that the power roller is inclinable relative to a center of curvature of the input and output discs. Power roller bearings are arranged to rotatably support the power rollers relative to the respective trunnions. The following inequality is established: Ro/(2×R22)≦0.63 wherein: Ro: radius of curvature of the toroidal concave surface of each of the input and output discs, that is defined on a cross section of each of the input and output discs taken along the common axis, R22: radius of curvature of the rounded outer surface of each power roller, that is defined on a cross section of the power roller taken along the common axis.

Dependencies are inferred from the claim text.