ELECTRIC ASSISTED BICYCLE

A provided electric assisted bicycle is configured such that an internal derailleur is provided in a drive unit that internally combines a human driving force and an auxiliary driving force, and the electric assisted bicycle can automatically change gears. The drive unit disposed at an intermediate...

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Bibliographische Detailangaben
1. Verfasser: KAWAKAMI, Masafumi
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:A provided electric assisted bicycle is configured such that an internal derailleur is provided in a drive unit that internally combines a human driving force and an auxiliary driving force, and the electric assisted bicycle can automatically change gears. The drive unit disposed at an intermediate position between a front wheel and a rear wheel includes a transmission mechanism (25) that transmits a resultant force of a human driving force and an auxiliary driving force from a motor while changing multiple gears. The transmission mechanism (25) includes a transmission weight (81) whose orientation is changed according to a centrifugal force during a rotation of the transmission weight (81). An increase in the rotation speed of a crank shaft (7a) changes the orientations of the transmission weights (81) so as to change from a low gear to a high gear.