| 摘要 |
A continuously variable transmission comprises a driving pulley (11), a driven pulley (21), an endless dry-type belt (15) wound around both pulleys, a tension-adjusting device (50) arranged between the driving and driven pulleys for pressing the slack side of the belt to generate belt tension, stroke mechanisms (14, 22) provided on the driving and driven pulleys respectively for axially shifting the movable sheaves depending on inputted rotational force, a ratio-changing motor (40), and a gear mechanism for transmitting the rotational force generated by the motor to both stroke mechanisms as well as for mechanically connecting both stroke mechanisms in such a way that the movable sheaves of both pulleys can be shifted synchronously and axially oppositely in relation to the fixed sheaves. With this arrangement, the belt is prevented from slipping, the transmission ratio can be controlled precisely and stably, and the shift-response of this transmission can be improved. The motor can be reduced both in its size and its consumption of electric power.
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