Auxiliary electrical drive for bicycle has output shaft of electric motor supplied from electrical storage device and coupled to rear wheel hub via planetary gear with three gear stages

摘要

The cycle has an auxiliary electrical drive (2) with an output shaft of an electric motor supplied from an electrical storage device that can be coupled to the hub (3) of the rear wheel (4) via a planetary gear with three gear stages. The hollow shaft electric motor is mounted with its central axis coaxial with that of the rear wheel.