Mazda Motor Corporation

Hirokazu Kouno

Masanori Sasaki

Masamichi Fujikawa

Yasuo Miura

Takeyuki Tanaka

Kensuke Ueda

Kazuhiro Yamada

Shinya Okumura

Kazuyuki Shiino

Masashi Morihiro

Takashi Miyamoto

Ryohei Hanamure

Sayaka Katayama

Siyuan Tao

Yuya Takemura

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

Hirokazu Kouno