Patent ID: 6905437
Filing Date: 2005-06-14
Classification: F16C,F16H,Y02T

Abstract:
1. A power roller bearing of a toroidal continuously variable transmission unit, which is provided for swinging motion between an input disc capable of being rotated by means of a drive source and an output disc opposed to said input disc, the power roller bearing of the toroidal continuously variable transmission unit comprising: an outer race; a power roller in rolling contact with said input disc an output disc; and balls provided for rolling motion between said outer rap and said power roller, said outer race and said power roller having heat-treated and ground annular raceway grooves, respectively, in which said balls roll individually, said raceway grooves being lubricated with a traction oil; wherein a heat-treated-surface layer is formed in at least one of the raceway grooves of said outer race and said power roller, the heat-treated-surface layer comprising a residual compression stress layer subjected first to super finishing and then to shot-preening, said residual compression stress layer having: residual compression stress ranging from −20 kgf/mm depressions, formed by said shot-preening for holding said traction oil.