Mazda Motor Corporation

Takeyuki Tanaka

Yasuo Miura

Masanori Sasaki

Masamichi Fujikawa

Kazuhiro Yamada

Hirokazu Kouno

Kensuke Ueda

Akira Hashimoto

Masashi Morihiro

Takashi Miyamoto

Shinya Okumura

Kazuyuki Shiino

Tomoya Nakano

Sayaka Katayama

Yuya Takemura

Hiroyuki Enoki

Ryohei Hanamure

Siyuan Tao

An automatic transmission which includes a first rotating member and a second rotating member is provided. The first rotating member includes an outer rotating member having a first outer power transmission part and an outer extending part, and an inner rotating member which is made of a different material from the outer rotating member and has a first inner power transmission part and an inner extending part. The outer and inner extending parts are coupled through a first extending part formed by axially joining them to each other at a caulking part. The second rotating member includes a second extending part having a recess indented on an opposite side of the first extending part. The caulking part has a protrusion protruding by being recessed from the first extending part to the second extending part. At least a part of the protrusion is located inside the recess.

Automatic transmission

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.

Automatic transmission power transmission device

A friction engagement device of an automatic transmission is provided, which includes a rotational member comprised of at least one of a drum member and a hub member including a spline part engaged with a friction plate to be movable in axial directions of the automatic transmission, and a drive force transmitting part for exchanging a drive force with another rotational element. The drive force transmitting part of the rotational member is made of a ferrous metal. A part of the rotational member other than the drive force transmitting part is made of a clad material containing a first material that is easily joined to the ferrous metal and a second material that is less easily joined to the ferrous metal compared to the first material and weighs less than the ferrous metal.

Friction engagement device of automatic transmission

Growing community of inventors

Hiroshima, Japan

Takeyuki Tanaka