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:
Dec. 08, 2009
Filed:
Dec. 22, 2006
Nobuhiro Sato, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Akira Fukatsu, Anjo, JP;
Mikio Iwase, Anjo, JP;
Kazutoshi Nozaki, Aichi-ken, JP;
Atsushi Honda, Seto, JP;
Nobuhiro Sato, Anjo, JP;
Tetsuya Yamaguchi, Anjo, JP;
Kazuyuki Noda, Handa, JP;
Akira Fukatsu, Anjo, JP;
Mikio Iwase, Anjo, JP;
Kazutoshi Nozaki, Aichi-ken, JP;
Atsushi Honda, Seto, JP;
Aisin AW Co., Ltd., Aichi-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A hydraulic control apparatus, provided with a manual shift valve that outputs a forward range pressure and a reverse range pressure, and a linear solenoid valve that outputs an engagement pressure to the hydraulic servo that engages during reverse travel when energized, includes a fourth clutch relay valve that is interposed between the linear solenoid valve and the hydraulic servo. The fourth clutch relay valve communicates an engagement pressure of the linear solenoid valve to the hydraulic servo by locking in the normal position when a signal pressure of the solenoid valve is input, and communicates a reverse range pressure to the hydraulic servo by being switched to a fail position by the reverse range pressure during a failure in which the fourth clutch relay valve is de-energized. Thereby, it is possible to establish a reverse speed during a failure in which the solenoid valve is de-energized.