Resultant force transmitting body (29) which is freely rotatable by a resultant force that is a combination of a human power driving force and an auxiliary driving force, driving sprocket (13) to which rotation of resultant force transmitting body (29) is transmitted, and a gear shift mechanism which includes a plurality of selectable gear shift stages having different gear ratios and transmits a driving force to the resultant force transmitting body, are provided in driving unit (20) installed at an intermediate location between a front wheel and a rear wheel. The gear shift mechanism includes a plurality of transmission gears and switching body moving portion (62) that moves in accordance with a selected gear shift stage, and an electric switching device which includes a gear shift stage switching motor that is a gear shift stage switching driving source that generates a driving force which moves switching body moving portion (62) is installed in driving unit (20).
ELECTRIC-ASSIST BICYCLE
FAHRRAD MIT ELEKTRISCHEM HILFSFANTRIEB
BICYCLETTE À ASSISTANCE ÉLECTRIQUE
2019-09-11
Patent
Electronic Resource
English
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