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. 28, 2012
Filed:
Dec. 02, 2009
Tomomi Ishikawa, Okazaki, JP;
Hiroyuki Kutsubo, Anjo, JP;
Tetsuya Shimizu, Anjo, JP;
Kenichi Tsuchida, Hazu-gun, JP;
Kazunori Ishikawa, Toyota, JP;
Naoyuki Fukaya, Okazaki, JP;
Tomomi Ishikawa, Okazaki, JP;
Hiroyuki Kutsubo, Anjo, JP;
Tetsuya Shimizu, Anjo, JP;
Kenichi Tsuchida, Hazu-gun, JP;
Kazunori Ishikawa, Toyota, JP;
Naoyuki Fukaya, Okazaki, JP;
Aisin AW Co., Ltd., Anjo-shi, Aichi-ken, JP;
Abstract
A hydraulic control device for an automatic transmission, including: a hydraulic pressure source; a plurality of friction engagement elements; a line pressure regulating valve that regulates hydraulic pressure from the hydraulic pressure source to a predetermined line pressure; a plurality of operation pressure regulating valves that regulate the line pressure as operation pressure for a hydraulic servo operating a friction engagement element; a maximum pressure conducting circuit that feeds a maximum pressure, among the operation pressures, to the line pressure regulating valve, wherein the friction engagement elements are engaged and released to achieve a plurality of forward speeds and a reverse speed, and the line pressure regulating valve regulates the line pressure during forward travel based on the maximum operation pressure, and regulates the line pressure during reverse travel based on the operation pressure input from a specific operation pressure regulating valve.