Patent ID: 6440034
Filing Date: 2002-08-27
Classification: F16H

Abstract:
A toroidal-type continuously variable transmission, comprising:a rotary shaft; first and second disks rotatably supported on the periphery of said rotary shaft respectively, each of said disks including an inner surface formed as a concave surface having an arc-shaped section; a plurality of trunnions respectively swingable about pivot shafts disposed at torsional positions with respect to the center axes of said first and second disks, each of said trunnions including a circular hole formed in the middle portion thereof in a direction perpendicular to the axial direction of said pivot shafts; a plurality of displacement shafts each including a support shaft portion and a pivot shaft portion, which extend in parallel to each other and are offset from each other; a first radial needle roller bearing disposed inside said circular hole of said trunnion, for rotatably supporting said support shaft portion; a plurality of power rollers respectively held by and between said first and second disks, each of said power rollers including peripheral surface formed as a spherically convex surface; and, a second radial needle roller bearing disposed on the periphery of said pivot shaft portion, for rotatably supporting said power roller, wherein the radial clearance of said second radial needle roller bearing is set larger than the radial clearance of said first radial needle roller bearing.