Patent ID: 7326146

Claim:
A continuously variable transmission comprising: a casing; a rotary shaft rotatably supported in an interior of the casing; a pair of outside disks each including an axial-direction one-side surface having an arc-shaped section and supported on the rotary shaft so as to be rotated in synchronization with the rotary shaft, the respective axial-direction one-side surfaces being opposed to each other; an inside disk including axial-direction two-side surfaces each having an arc-shaped section and rotatably supported on the periphery of the middle portion of the rotary shaft so as to be rotated with respect to the rotary shaft, the axial-direction two-side surfaces being opposed to the axial-direction one-side surfaces of the two outside disks; support members disposed by two or more respectively between the one side axial-direction surface of the inside disk and the axial-direction one-side surface of the out side disk with respect to the axial direction of the toroidal-type continuously variable transmission so as to be swung and shifted about pivot shafts disposed on the two end portions thereof; power rollers each including a peripheral surface formed as a spherical-shaped convex surface, the power rollers respectively being rotatably supported on the support members, the peripheral surface of the power rollers being contacted with the axial-direction two-side surface of the inside disk and the axial-direction one-side surface of the outside disk; ball bearings having inner and outer races, with a preload applied thereto, for supporting the inside disk in such a manner that the inside disk is rotated with respect to the casing, and a member fixed to the inner surface of the casing, wherein the inside disk includes axial-direction two end portions and the ball bearings are thrust bearings which support the member fixed to the inner surface of the casing in such a manner that the member is rotated with respect to small-diameter side of the end portion of the inside disk; the thrust bearings are interposed between a retaining portion and the axial-direction two end portions; and a plurality of projecting strips extending from the outer bearing races and fitted to an inner surface of the retaining portion, and a plurality of projecting strips extending from the inner bearing races and fitted to the arc shaped portion of the inside disk.