Patent ID: 6626795
Filing Date: 2003-09-30
Classification: F16C,F16H

Abstract:
A toroidal-type continuously variable transmission, comprising:an input shaft; an input disk rotatable together with said input shaft; an output disk disposed concentrically with said input disk and supported rotatable with respect to said input disk; a plurality of trunnions respectively swingable about support shafts disposed at twisted positions with respect to the center axes of said input and output disks; a plurality of shift shafts respectively supported on said trunnions; a plurality of power rollers respectively rotatably supported on said shift shafts and interposed between said input and output disks; and thrust ball bearings for supporting thrust loads applied to said power rollers, wherein each of said thrust ball bearing comprises: an inner ring raceway formed in the outer peripheral surface of said power roller; an outer ring including an outer ring raceway formed in the inner peripheral surface thereof; a plurality of rolling elements interposed between and rollable along said inner ring raceway and said outer ring raceway; and, a retainer for holding said balls therein, wherein said retainer is formed of high strength brass and said high strength brass has a micro structure in which the &agr; phase thereof is 40% or more in the area ratio thereof, and the hardness of said retainer is set at HB80 or higher.