| 摘要 |
<p>A variable-speed drive (1) having an input shaft (3), at least one output shaft (4), and a system (5) for connecting the input shaft (3) to the output shaft (4) and enabling the velocity ratio of the shafts (3, 4) to be varied continuously; which system is defined by a first truncated-cone-shaped rotary body (6) angularly integral with the output shaft (4) and defined laterally by a curved convex surface (7) having a given curve radius, and by a number of second truncated-cone-shaped rotary bodies (8) angularly integral with the input shaft (3) and arranged in a ring about the first rotary body (6). Each second rotary body (8) is defined laterally by a curved concave surface (9) having a curve radius greater than that of the convex surface (7) defining the first rotary body (6), is pressed against the first rotary body (6) by a forcing device (43) defined by a pair of helical gears (41, 42), and is controlled by a device (10) for rocking each second rotary body (8) to and from the axis of rotation (14) of the first rotary body (6), so that the curved surfaces (7, 9) cooperate mutually at a single point of tangency (P).</p> |
