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:
Aug. 28, 2007
Filed:
May. 27, 2005
Kazutoshi Nozaki, Nisshin, JP;
Masami Kondo, Toyota, JP;
Kazuyuki Noda, Handa, JP;
Takuya Fujimine, Hamamatsu, JP;
Kazutoshi Nozaki, Nisshin, JP;
Masami Kondo, Toyota, JP;
Kazuyuki Noda, Handa, JP;
Takuya Fujimine, Hamamatsu, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Aisin AW Co., Ltd., Anjo-shi, JP;
Abstract
A hydraulic control apparatus for use with a vehicle's automatic transmission, the apparatus including a fail-safe switch valve which has an escape-related output port connected to a drain port of a transmission-related solenoid valve corresponding to an escape-related frictional coupling device to establish an escape-related speed step, and additionally has an escape-related input port to which a hydraulic pressure is inputted, and a drain port from which a hydraulic fluid is drained, wherein the fail-safe switch valve is selectively switchable to a normal communication state thereof in which the escape-related output port and the drain port are communicated with each other and the escape-related input port is shut off, and to a fail-related communication state thereof in which the escape-related output port and the escape-related input port are communicated with each other, and the drain port is shut off, so that a hydraulic pressure is supplied from the escape-related output port of the fail-safe switch valve to the drain port of the transmission-related solenoid valve corresponding to the escape-related frictional coupling device.