公开(公告)号：US20220379997A1

公开(公告)日：2022-12-01

申请号：US17332942

申请日：2021-05-27

Applicant: SHIMANO INC.

Inventor： Kohei OHYABU ,  Tomohiro NOMA ,  Hiroyuki TORII

IPC: B62M9/10 ,  B62M9/136

Abstract: A front sprocket assembly comprises a first sprocket and a second sprocket. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. At least one tooth of the plurality of second sprocket teeth includes a less chain-interference recess provided to the second axially inwardly facing surface. The less chain-interference recess is configured to reduce interference between the at least one tooth of the plurality of second sprocket teeth and a chain in an upshifting operation in which the chain is shifted from the first sprocket toward the second sprocket. The less chain-interference recess has a radially innermost end positioned radially inwardly from a tooth bottom circle of the plurality of second sprocket teeth. A radial distance radially defined from the tooth bottom circle to the radially innermost end with respect to a rotational center axis is equal to or larger than 1.0 mm.