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:
Jun. 23, 2020
Filed:
Jan. 30, 2019
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
An automatic transmission is provided with a brake including a hub member coupled to a transmission case, a drum member coupled to a given rotary member, friction plates, a piston configured to engage the friction plates, and a hydraulic chamber for engagement disposed radially inward of the hub member and to which hydraulic fluid for biasing the piston in an engaging direction is supplied. The piston includes a pressing part configured to press the friction plates, a hydraulic chamber for engagement forming part, and a coupling part coupling the pressing part to the hydraulic chamber for engagement and extending radially. The hub member includes spline parts with which the friction plates are spline-engaged. Notches are formed by cutting the coupling part of the piston so as to be spaced apart from each other in circumferential directions, and end parts of the spline parts in axial directions enter into the notches.