| 摘要 |
PURPOSE:To rotate an output shaft by speed change ratio related to the rotary speed of an input shaft, by rotatably and slidably arranging a conical wheel to be concentrically provided with a fixed plate, on which ball units move rolling, and utilizing a planetary motion made by the ball units. CONSTITUTION:A carrier 2 is fixed to an input shaft 1, and steel balls 3, being housed in a plural number of grooves 21 having a predetermined tilt angle theta in both directions with respect to the peripheral direction of the carrier 2, move rolling on a fixed plate 8 while the steel balls 3 are forced to come into contact with its internal peripheral surface having a conical face. Further a conical wheel 9 having a conical face, on which the steel ball 3 moves rolling while being brought into forced contact with the periphery, is rotatably and slidably provided and pressed to a side of the input shaft 1 by providing a cam face 101 on the side of an output shaft 10 to be opposed to a cam face 91 provided on a side face of the conical wheel 9 and generating a load in the axial direction in accordance with load torque by the cam face 101. Accordingly, the steel ball automatically changes its own center, on which it revolves, so as to obtain predetermined speed change ratio by force acting on three points of the carrier 2, conical wheel 9 and the fixed plate 8 forced to be brought into contact with the steel ball 3 and by centrifugal force acting on a cam mechanism generating axial force in accordance with the load and the steel ball. |
