| 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 (I 1 ) and a separate second rotary drive input (I 2 ), the first (I 1 ) and second rotary drive (I 2 ) inputs and said rotary driven output ( 30 ) member being drivingly interconnected with one another such that changes in the relative rotation of the first (I 1 ) and second rotary drive (I 2 ) 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 (I 2 ) 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 (I 1 ) and the rotary adjustment means ( 53, 56 ) are directly driven thereby. |
