| 摘要 |
An apparatus (1000) for changing speed between two parallel shafts ((X), (J)) of a bicycle, for example. The apparatus (1000) includes a speed-change device (100; 100*; 100**), and a speed-change mechanism connected mechanically to the speed-change device (100; 100*; 100**). The apparatus (1000) is characterized in that the speed-change device (100; 100*; 100**) has two arc-shaped flexible members ((BNL1); (BNL2)) on which a chain rests. And the radius of curvature ((R1); (R2) ) of the two arc-shaped flexible members ((BNL1); (BNL2)) can be user-adjusted by operating actuating devices controlled by the speed-change mechanism, to achieve the desired velocity ratio of the two shafts ( (X), (J) ). |
