Bicycle i.e. pedelec, has chain pinion that moves vertically against spring force and releases electrical switch in track-dependent manner, where electromotive drive is controlled by electrical switch

摘要

The bicycle has an electromotive drive provided as a pedal assistance unit with a pedal force sensor. The sensor has a vertically mobile chain pinion (9) that intervenes in an upper chain strand. The pinion functions as a spring-tensioned chain tightener. The drive only is connected, when the strand is tightened between a chain wheel (1) of a bottom bracket (2) and a drive pinion (3) of a rear wheel (4) by a pedal force. The pinion moves vertically against a spring force and releases an electrical switch (11) in a track-dependent manner, where the switch controls the drive.