TOROIDAL CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A toroidal continuously variable transmission (T) comprises a main shaft (1) having a step section (1A). An input disc (2A, 2B) is drivably supported on the main shaft (1) and axially movable along the axis of the main shaft. An output disc (3A, 3B) is rotatably supported on the main shaft (1) and located facing the input disc (2A, 2B). A power roller (4, 5) is disposed between and in frictional engagement with the input disc (2) and the output disc (3) so as to make transmission of power from the input disc (2) to the output disc (3). Belleville springs (7) (each having a center opening) are disposed around the main shaft (1) and located at an opposite side of the input disc (2) with respect to the output disc (3) so as to press the input disc (2) toward the output disc (3). A loading nut (8) is screwed on the main shaft (1) to restrict a contraction amount of the belleville springs (7). The loading nut (8) axially faces the step section of the main shaft. A sleeve (S) is disposed between the loading nut (8) and the step section (1A) of the main shaft (1). The sleeve (S) is separable from the loading nut (8). The belleville springs (7) are mounted on the sleeve (S) in a manner that the sleeve (S) passes through the central opening of each belleville spring (7).