Patent ID: 6475111
Filing Date: 2002-11-05
Classification: F16H

Abstract:
A toroidal continuously variable transmission comprising:an input disk and an output disk disposed facing each other on a common axis, power rollers provided so that it can transmit engine torque between these input/output disks, press member disposed at the rear of one of the input disk and the output disk which presses in the direction of the other disk, and trunnions which support the power roller free to rotate and is able to gyrate around a gyration axis perpendicular to a rotation axis of the power roller, wherein: the trunnions support the power rollers, so that they support a thrust force acting in the power rollers rotation axis direction and a traction force acting in the gyration axis direction, the each of power rollers comprises a power roller inner wheel in frictional contact with the input/output disks, a power roller outer wheel supported in the trunnion, a ball bearing interposed between the power roller inner wheel and the power roller outer wheel, and an inner wheel supporting shaft which supports the power roller inner wheel such that it is free to rotate, the shaft having a shaft base part provided in the trunnion, and arranged so that the radial support rigidity is set high in the gyration axis direction and set low in the direction perpendicular to the trunnion gyration axis and the power roller rotation axis, and when one of the disks is pressed and displaced in the direction of the other disk by a press member, the power roller inner wheel displaces with the ball bearing by the displacement of the one of the disks.