Treadle-drive transmission wheel series with periodically varied speed ratio and having inward packing auxiliary wheel

摘要

In the present invention, one or both of an active wheel (113) or a passive wheel (413) is composed of an eccentric transmission wheel and is combined with a synchronous transmission belt (100) for forming an eccentric wheel transmission wheel series (1000), so that when the feet input forces at different angles from the treadle shafts (103, 203) of the treadles (102, 202) to an active wheel shaft (111) combined on the active wheel (113) through cranks (101, 201), the active wheel (113) forms different transmission speed ratios relative to the passive wheel (413) according to the treadle angle, and random inward packing (belt tensioning by auxiliary wheel 312) is performed to the transmission belt (100) of the engage end of the eccentric passive wheel (413) during the transmission for stabling the operation.