[PROBLEM] A load of a rider is prevented from increasing.[SOLUTION] A power assist unit for a bicycle includes a small-diameter sun gear; a large-diameter sun gear; a first planetary gear configured to mesh with the small-diameter sun gear; a second planetary gear configured to mesh with the first planetary gear and the large-diameter sun gear; a shared carrier configured to connect the first planetary gear and the second planetary gear to rotatably support the first planetary gear and the second planetary gear; a ring gear configured to mesh with the second planetary gear; a first brake configured to lock rotation of the shared carrier; a second brake configured to lock rotation of the large-diameter sun gear; a clutch configured to detachably couple the small-diameter sun gear and the shared carrier; an electric motor configured to assist a drive force in accordance with the pedaling force from the rider; a gear mechanism configured to transmit the drive force output from the electric motor to the ring gear; and a case fixed to the ring gear and configured to transmit at least one of the pedaling force and the drive force to a drive wheel.
POWER ASSIST UNIT FOR BICYCLE AND POWER ASSISTED BICYCLE
HILFSANTRIEBSVORRICHTUNG FÜR FAHRRAD UND HILFSANTRIEBSFAHRRAD
UNITÉ D'ASSISTANCE ÉLECTRIQUE POUR BICYCLETTE ET BICYCLETTE À ASSISTANCE ÉLECTRIQUE
2025-04-30
Patent
Electronic Resource
English
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