Toroidal-type continuously variable transmission

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, said inner surfaces of said disks being opposed to each other;
• 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 respectively projecting from the inner surfaces of said trunnions, each of said displacement shafts 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 a peripheral surface formed as a spherically convex surface, the peripheral surfaces of said power rollers being contacted with the inner surfaces of said first and second disks;
• a second radial needle roller bearing disposed on the periphery of said pivot shaft portion of said displacement shaft, for rotatably supporting said power roller;
• and,
• a plurality of thrust ball bearings respectively interposed between said power rollers and the inner surfaces of said trunnions, for supporting thrust-direction loads applied to said power rollers,
• 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.