| 摘要 |
PCT No. PCT/IT92/00104 Sec. 371 Date Jul. 8, 1994 Sec. 102(e) Date Jul. 18, 1994 PCT Filed Aug. 12, 1992 PCT Pub. No. WO93/05318 PCT Pub. Date Mar. 18, 1993A 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 secured to the output shaft (4) and defined laterally by a curved convex surface (7) having a given radius of curvature and by a number of second truncated-cone-shaped rotary bodies (8) angularly secured to 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 radius of curvature greater than that of the convex surface (7) defining the first rotary body (6). The rotary bodies (7) are pressed against the first rotary body (6) by a forcing device (43) formed by a pair of helical gears (41, 42), and is controlled by a device (10) for rocking each second rotary body (8) relative to the axis of rotation (14) of the first rotary body (6), so that the curved surfaces (7, 9) mutually engage at a single point of tangency (P). |
