公开(公告)号：US10000255B2

公开(公告)日：2018-06-19

申请号：US15057984

申请日：2016-03-01

Applicant: Shimano Inc.

Inventor： Satoshi Shahana ,  Tomohisa Yamamoto ,  Hiroyuki Urabe ,  Yusuke Nishikawa

IPC: F16H3/72 ,  B62M6/55 ,  B62K25/28 ,  B62M11/14 ,  F16H1/28

Abstract: A bicycle drive unit is basically provided with an assist motor and a housing such that the distance between a crankshaft and a rear end of the housing is prevented from becoming long. The assist motor is configured to apply an assisting force to a manual drive force, which is inputted from a crankshaft. The housing is provided to the assist motor and at least a part of the crankshaft. The housing is disposed around the crankshaft. The housing is formed so that, when the bicycle drive unit is attached to a bicycle frame, the minimum distance from a center axis of the crankshaft and the rear end surface of the frame on the rear end side of the housing is equal to or less than 50 mm and greater than the radius of the crankshaft, as viewed from parallel to the center axis of the crankshaft.

公开(公告)号：US09896152B2

公开(公告)日：2018-02-20

申请号：US14720944

申请日：2015-05-25

Applicant: SHIMANO INC.

Inventor： Tomohisa Yamamoto ,  Satoshi Shahana ,  Makoto Usui

IPC: B62M6/45 ,  B62M6/55 ,  B62M9/122 ,  B62M9/132 ,  B62M25/08 ,  B62M25/00

CPC classification number: B62M6/45 ,  B62M6/55 ,  B62M9/122 ,  B62M9/132 ,  B62M25/08 ,  B62M2025/003

Abstract: A bicycle transmission system comprises a first input device, a transmission, an assist device, and a controller. The first input device is configured to receive a first input operation from a user. The transmission is configured to transmit a pedaling torque to a wheel at a current gear ratio among a plurality of gear ratios. The assist device is configured to assist a rotation of the wheel at a current assist ratio among a plurality of assist ratios. The controller is configured to change the current gear ratio into a predetermined gear ratio without changing the current assist ratio based on the first input operation in a first condition. The controller is configured to change the current gear ratio into a predetermined gear ratio and change the current assist ratio into a predetermined assist ratio based on the first input operation in a second condition.