| 摘要 |
<p>A bicycle chain transmission, comprising a pedal link (4) adjustably fastened in a holder plate (30) mounted on the outer side of a chain wheel (3) and connected with a side projection (241) of a bearing block (24) which is mounted on an eccentric sleeve (2040) at the bottom of a bottom bracket bearing axle of a bicycle. The eccentric motion of the eccentric sleeve (2040) forces the bearing block (24) to rotate eccentrically so as to squeeze the pedal link (4) to adjust the length of its arm of force according to its angle position relative to the chain wheel (3), so that reduced labor consumption in pedaling can be achieved. <IMAGE></p> |
