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:
Mar. 10, 1998
Filed:
Jan. 30, 1996
Shinya Kamada, Hiroshima, JP;
Kenji Sawa, Hiroshima, JP;
Hiroshi Shinozuka, Hiroshima, JP;
Tomoo Sawazaki, Higashihiroshima, JP;
Koichi Yamamoto, Hiroshima, JP;
Kazushi Kurokawa, Hiroshima, JP;
Takamichi Teraoka, Hiroshima, JP;
Masakazu Hombo, Hiroshima, JP;
Naotaka Hirami, Hiroshima, JP;
Yasunori Kanda, Higashihiroshima, JP;
Akinobu Aoki, Higashihiroshima, JP;
Tatsuhiko Iwasaki, Aki-gun, JP;
Takeyoshi Kawa, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima-ken, JP;
Abstract
A hydraulic control system for an automatic transmission having at least a forward clutch which is unlocked in a fourth gear and locked in other forward gears and a lock-up clutch for coupling input and output elements of a torque converter together is equipped with a pressure control valve for controlling operating pressure for the forward clutch, a lock-up control valve for connecting and disconnecting the first valve from the lock-up clutch, a pressure line through which control source pressure is introduced into the forward clutch while the first valve is in communication with the lock-up clutch, and a shift valve for discharging the control source pressure from the pressure line.