| 摘要 |
<p>A dual-pass continuously variable transmission includes an input shaft (12), an output shaft (16), gear sets forming gear trains having equal fixed ratios, and an asymmetric variator (48) having a ratio range with limits of an underdrive ratio numerically less than an overdrive ratio, which in turn is substantially equal to the fixed ratio. One-way clutches (26,44) are engageable for establishing a first drive path from tne input shaft (12) through selected gear sets (28,46) and the variator in one direction to the output shaft (16). Jaw clutches (32,38) are engageable for establishing a second drive path from the input shaft (12) through other selected gear sets (34,40) and the variator (48) in the opposite direction to the output shaft (16). The variator ratio is varied through its range from underdrive to overdrive in the one direction. The jaw clutches (32,38) are then engaged, establishing the second drive path and causing the one-way clutches to disengage as the variator ratio is varied through its range in the opposite direction.</p> |
