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:
Feb. 27, 2018
Filed:
May. 23, 2014
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Koshiro Saji, Hiroshima, JP;
Shinya Kamada, Kure, JP;
Shotaro Nagai, Hiroshima, JP;
Yasunari Nakayama, Kure, JP;
Masaru Nakagishi, Hiroshima, JP;
Yasuo Shigenaka, Otake, JP;
Motomi Kobayashi, Hiroshima, JP;
MAZDA MOTOR CORPORATION, Aki-gun, Hiroshima, JP;
Abstract
A hydraulic control circuit includes: a shift valve configured to be switched between a state of supplying oil pressure to a clearance adjusting chamber of an LR brake and a state of discharging the oil pressure from the clearance adjusting chamber of the LR brake; and a linear SV configured to control the oil pressure supplied to a pressing chamber of the LR brake. The hydraulic control circuit further includes a source pressure oil passage through which oil pressure equal to the oil pressure supplied from the shift valve to the clearance adjusting chamber is supplied to a source pressure port a of the linear SV. By discharging the oil pressure in the clearance adjusting chamber at the time of opening malfunction of the linear SV, the oil pressure in the pressing chamber is also discharged through a drain port of the shift valve.