| 摘要 |
A rotary drive transmission having a rotary drive input (20) and a rotary driven output (30), the drive transmission being capable of selectively varying the drive ratio between the rotary drive input (20) and rotary driven output (30), the drive transmission including a main drive shaft defining the rotary drive input (20), a differential transmission assembly (40) having a rotary output member (30) which defines said rotary driven output (30), the differential assembly (40) including a first rotary drive input (I1) and a separate second rotary drive input (I2), the first (I1) and second rotary drive (I2) inputs and said rotary driven output (30) member being drivingly interconnected with one another such that changes in the relative rotation of the first (I1) and second rotary drive (I2) inputs causes a rotational change in said rotary output member (30), and selectively operable rotary adjustment means (53, 56) for adjusting the rotation of the second rotary drive input (I2) for selectively controlling rotation of the rotary output member (30), the differential assembly (40) and the adjustment means (53, 56) each being mounted on the main drive shaft such that said first rotary drive input (I1) and the rotary adjustment means (53, 56) are directly driven thereby. |
