公开(公告)号：US20200269953A1

公开(公告)日：2020-08-27

申请号：US16282239

申请日：2019-02-21

Applicant: SHIMANO INC.

Inventor： Yasufumi FUKUNAGA ,  Atsuhiro EMURA ,  Kohei HOKAI

IPC: B62M9/10 ,  F16H55/30

Abstract: A bicycle rear sprocket comprises a sprocket body and a plurality of sprocket teeth including a plurality of driving-noise reduction teeth. Each of the plurality of driving-noise reduction teeth comprises an upstream circumferential surface, a downstream circumferential surface, a first chamfer, and a second chamfer. The first chamfer has a first borderline relative to the bicycle outward surface. The second chamfer has a second borderline relative to the bicycle outward surface. A first opposite end of the first borderline and a second opposite end of the second borderline are disposed radially outwardly from each of a first end of the first borderline and a second end of the second borderline with respect to the rotational center axis. A total number of the plurality of driving-noise reduction teeth is equal to or larger than one-third of a total tooth-space number of the plurality of sprocket teeth.