Driving unit for an electric motor driven bicycle

B - Operations – Transporting – 62 – M

Patent

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Details

B62M 6/50 (2010.01) B62K 11/00 (2006.01)

Patent

CA 2216475

In a driving unit for an electric motor driven bicycle, a motor (31) has an output shaft coaxial with a crank shaft (39) of a pedal. A planet roller reducer (40) has a sun roller shaft coincident with the output shaft. Through the planet roller reducer (40) and a two-stage reducing gear mechanism (50) for further reducing the output of the planet roller reducer (40), a torque of the motor (31) is transmitted to a driving chain sprocket (4). Provided that the torque of the motor (31) exceeds a predetermined pedaling torque level, the torque is transmitted to the driving chain sprocket (4).

Cette invention concerne un entraînement électrique d'appoint pour bicycle dont le moteur (31) a un arbre de sortie dont l'axe de rotation coïncide avec celui de la manivelle (39) du pédalier. L'axe porte-planétaire d'un réducteur planétaire à rouleaux (40) se trouve dans le prolongement de l'arbre de sortie susmentionné. Le couple du moteur (31) est transmis au plateau d'entraînement de la chaîne par l'intermédiaire du réducteur (40) et un engrenage réducteur à deux rapports (50) placé à la suite du réducteur (40). Le couple du moteur (31) est transmis au plateau (4) seulement lorsqu'il dépasse un niveau prédéterminé de couple au pédalier.

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