The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2020
Filed:
Feb. 16, 2017
Mazda Motor Corporation, Hiroshima, JP;
Yutaro Fukuda, Hiroshima, JP;
Tadashi Saito, Hiroshima, JP;
Masahiro Kaji, Hiroshima, JP;
Manabu Sasahara, Hiroshima, JP;
Tomohiro Kubo, Hiroshima, JP;
Shinya Kamada, Kure, JP;
Norio Iwashita, Hiroshima, JP;
Kaori Sako, Hiroshima, JP;
Tomotaka Ishizaka, Hiroshima, JP;
Tatsuhiko Iwasaki, Hiroshima, JP;
Koshiro Saji, Tokai, JP;
Tatsutoshi Mizobe, Hiroshima, JP;
MAZDA MOTOR CORPORATION, Hiroshima, JP;
Abstract
An automatic transmission includes a piston movable in an axial direction, a plurality of friction plates disposed on a side of a first surface of the piston, a fastening hydraulic chamber applying a hydraulic pressure to a second surface of the piston to move the piston to a fastening position where the friction plates are pressed to be fastened to each other, a release hydraulic chamber applying a hydraulic pressure to the first surface of the piston to move the piston to a release position where the friction plates are released, and a hydraulic pressure control valve that supplies and discharges the hydraulic pressure to and from each of the fastening hydraulic chamber and the release hydraulic chamber. An area of the second surface of the piston for receiving the hydraulic pressure is set to be larger than an area of the first surface for receiving the hydraulic pressure.