Patent ID: 6666792
Filing Date: 2003-12-23
Classification: C23C,F16H

Abstract:
A toroidal continuously variable transmission comprising an input disk attached to an input shaft, an output disk attached to an output shaft, and a power roller bearing including an inner ring, an outer ring, and a plurality of rolling elements, said inner ring engaging with said input and output disks to transmit power from said input shaft to said output shaft;wherein at least one of said input disk, output disk, and an inner ring of a power roller bearing is formed of an alloy steel and subjected to either carburizing processing and grinding, or carbonitriding processing and grinding, wherein at least one of said input disk, output disk and inner ring of the power roller bearing has an effective hardened layer of at least Hv 653 at a depth between 2.00 mm and 4.00 mm from a surface, and wherein at least one of said input disk, output disk and inner ring of the power roller bearing has a grain size of 8 or more, as defined by Japanese Industrial Standard JIS 0551, in the surface, and a grain size of 4 or more, as defined by Japanese Industrial Standard JIS 0551, in a core.