Patent ID: 6623400
Filing Date: 2003-09-23
Classification: F16H,Y10S

Abstract:
A toroidal-type continuously variable transmission, comprising:an input shaft supported so as to be freely rotatable; an input side disk rotatable together with said input shaft and including an inner surface formed as a concave surface having an arc-shaped section; an output side disk including an inner surface formed as a concave surface having an arc-shaped section, said output side disk being disposed concentrically with said input side disk in such a manner that said inner surface thereof is opposite to said inner surface of said input side disk; a plurality of trunnions respectively swingable about their associated pivot shafts disposed at tortional positions with respect to said input shaft; a plurality of displacement shafts respectively supported on said trunnions; a plurality of power rollers each including a peripheral surface formed as a spherical-shaped convex surface, disposed on the inner surfaces of said trunnions, and rotatably supported in the peripheries of said displacement shafts while said power rollers are held by and between said input side and output side disks; and, thrust rolling bearings for supporting thrust loads applied to said power rollers, each of said thrust rolling bearings including: an inner race raceway formed in the outer peripheral surface of said power roller; and an outer race disposed inside said trunnion and having an outer race raceway, wherein at least one of said concave surface of said input side disk, said concave surface of said output side disk, said convex surfaces of said power rollers, said inner race raceways and said outer race raceways of said thrust rolling bearings is, after heat treatment, subjected to grinding, superfinishing, shot-peening, and surperfinishing again in this order, and the value of the resultant surface residual compression stress is in the range from âˆ’780 to âˆ’1800 MPa.