Patent ID: 6066068
Filing Date: 2000-05-23
Classification: F16H,Y10S

Abstract:
A toroidal type 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 component selected from the group consisting of said inner and outer rings of said power roller bearing and said input and output disks is made of a material containing 0.15 to 0.5 wt %, 0.15 to 1.5 wt %, and 0.1 to 1.5 wt % of C, Si, and Mo, respectively, equal or not more than 9 ppm of oxygen, and said at least one component is subjected to carbonitriding, hardening, tempering and grinding, such that a finished surface C and N amounts are 0.8 to 1.2 wt % and 0.05 to 0.20 wt %, respectively, and the surface hardness has a Vickers hardness of equal or not less than Hv720, and hardness of the material at a depth of Dx from a surface is not equal to or less than Hv650, the Dx being a critical equivalent stress generation position in a synthetic stress distribution of a shearing stress distribution and a bending stress distribution and meeting Dx=3.0 Zo to 5.0 Zo where Zo is a maximum dynamic shearing stress generation position from the surface.