Patent ID: 6520888
Filing Date: 2003-02-18
Classification: F16H

Abstract:
A loading cam apparatus for a toroidal continuously variable transmission, said loading cam apparatus comprising:a first cam member having concave and convex portions thereon alternatively arranged along a circumferential direction thereof; a second cam member, having concave and convex portions thereon alternatively arranged along a circumferential direction thereof and disposed opposite to said first cam member in an axial direction thereof; a plurality of rolling elements interposed between said first cam member and said second cam member; and a retainer for holding said plurality of rolling elements in a freely rotatable state, wherein said retainer includes, a retainer main body of a circular annular shape, and pockets provided at outer periphery portions of said retainer main body for holding said plurality of rolling elements, respectively, and wherein said retainer main body is formed by carbonitriding material of iron system with a carbon concentration in a range of from 0.02 wt % to 0.20 wt % both inclusive, wherein said first cam member is formed on a loading cam, and wherein said retainer main body includes a guide portion fitted on said loading cam, outer diameter side projection portions provided at outer peripheral portions of said retainer main body to protrude on said second cam member side, and inner diameter side projection portions provided at inner peripheral portions of said guide portion to protrude on said first cam member side, wherein each of said inner diameter side projection portions is arranged to have a diameter larger than that of said guide portion thereby to form a step portion.