| 摘要 |
<p>A drive transmission (10) comprising a carrier member (32) is mounted on a rotatable crank shaft (16) a plurality of spaced, pivotally mounted segments (58) each segment carrying a rotatable drive element. A roller chain (76), is coupled with the sprocket (85), each segment (58) being in mesh with a free-wheeling gear rotatably mounted on the crank shaft (16). A chain takeup damper (89) is carried in spaced relationship to the crank shaft (16) and applies tension to a part of the chain at all times. As torque requirements on the crank shaft increase, the other part of the chain increases in tension causing the sprockets to be rotated toward the crank shaft to increase the drive ratio of the transmission. A resilient endless flexible band (82) biases the segments outwardly of the crank shaft and into a maximum drive ratio. A servo system (120) changes in the drive ratio which are dependent upon crank shaft speed.</p> |
