A drive unit provided in an electric-assist bicycle includes: resultant force transmitter (29) rotatable by resultant force generated by a combination of human driving force and auxiliary driving force; driving force output wheel body (13) to which rotation of resultant force transmitter (29) is transmitted; and a transmission mechanism that has a plurality of selectable gear positions with different gear ratios, and transmits driving force to resultant force transmitter (29). The transmission mechanism includes: a plurality of transmission gears including low-speed position transmission gear (36) and high-speed position transmission gear (41); high-speed position clutch (55) capable of transmitting driving force of high-speed position transmission gear (41) to resultant force transmitter (29); and clutch switch body (61) engageable to and disengageable from high-speed position clutch (55) and shifted in accordance with the selected gear position.
DRIVE UNIT AND ELECTRIC-ASSIST BICYCLE
ANTRIEBSEINHEIT UND FAHRRAD MIT ELEKTRISCHEM HILFSFANTRIEB
UNITÉ D'ENTRAÎNEMENT ET BICYCLETTE À ASSISTANCE ÉLECTRIQUE
2019-09-04
Patent
Electronic Resource
English
DRIVE UNIT OF ELECTRIC ASSIST BICYCLE, AND ELECTRIC ASSIST BICYCLE
European Patent Office | 2019
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