Patent ID: 6780139
Filing Date: 2004-08-24
Classification: F16H

Abstract:
A toroidal continuously variable transmission comprising:an input disc having a concave raceway surface in a side surface thereof; an output disc having a concave raceway surface opposing said raceway surface of the input disc; and a plurality of rollers disposed in a toroidal space defined by said raceway surfaces of the input disc and the output disc and rotated in contact with said raceway surfaces via oil films for transmitting torque between said discs by means of shear force on the oil films, wherein said discs and rollers are formed of a heat-resisting bearing steel and subjected to tempering at a temperature of 240Â° C. or over, and wherein at least a peripheral surface of said roller is subjected to a surface hardening treatment by shot peening thereby having a compressive residual stress of 0.6 to 1.2 GPa and a hardness of HRC 63 to 66 at an outermost surface thereof.