| 摘要 |
<p>A continuously variable transmission unit comprises a plurality of drive units each comprising a tapered input roller 10, a tapered output roller 11 and a drive belt 12 interconnecting said rollers, wherein all input and output rollers of the transmission unit are positioned with their axes parallel and with the tapers of the input rollers opposing those of the output rollers, the unit further comprising an adjuster unit (4, figure 2) that controls the position of the drive belts in a direction parallel to the axes of the rollers. The adjuster unit may comprise a hollow shaft with an externally threaded section (16, figure 10), an adjuster nut mounted on the shaft and a belt tensioner (18, 19) for each of the drive units. The system is preferably electronically controlled. Also disclosed is a bicycle comprising the transmission unit of the invention.</p> |
