公开(公告)号：US09994284B2

公开(公告)日：2018-06-12

申请号：US14871679

申请日：2015-09-30

Applicant: Shimano Inc.

Inventor： Hioryuki Urabe ,  Tetsuya Hino ,  Takashi Yamamoto

IPC: B62M6/55 ,  B60K17/06 ,  B60L11/18

CPC classification number: B62M6/55 ,  B60K17/06 ,  B60L11/007 ,  B60L11/18 ,  B60L15/2045 ,  B60L15/2054 ,  B60L2200/12 ,  B60L2240/12 ,  B60L2240/423

Abstract: A bicycle assist unit is basically provided with a transmission and an assist motor. The transmission is configured to receive rotation of a crankshaft. The transmission includes a planetary gear mechanism. The planetary gear mechanism includes an output unit, a plurality of ring gears and a rotation restricting mechanism that selectively restricts rotation of the ring gears. The assist motor is configured to output a second drive force that is added to a first drive force that is outputted from the transmission on a power transmission path between the output unit and a front sprocket that is attached to the crankshaft.