公开(公告)号：US20210048103A1

公开(公告)日：2021-02-18

申请号：US16768864

申请日：2018-11-13

Applicant: Mazda Motor Corporation

Inventor： Masanori SASAKI ,  Masamichi FUJIKAWA ,  Kazuhiro YAMADA ,  Kensuke UEDA ,  Sayaka KATAYAMA ,  Yasuo MIURA ,  Takeyuki TANAKA ,  Hirokazu KOUNO ,  Takashi MIYAMOTO ,  Ryohei HANAMURE ,  Siyuan TAO

IPC: F16H63/30 ,  F16H3/66 ,  F16H57/10 ,  F16D65/12 ,  F16D55/36

Abstract: A power transmission device in an automatic transmission includes a friction tightening element (a second brake) having a drum member, and a transmission path constituent member (a third ring gear) coupled to the drum member via a coupling part extending circumferentially along the drum member, the drum member having low-rigidity parts (long holes) provided at a plurality of circumferential positions on the drum member in at least one of portions radially outside and inside the coupling part.