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:
Nov. 17, 2009
Filed:
Feb. 12, 2007
Hiroshi Fukushima, Toyota, JP;
Naoki Kato, Aichi-ken, JP;
Kenichi Tsuchida, Anjo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
A hydraulic control apparatus for a vehicular fluid-actuated power transmitting device provided with a lock-up clutch and an oil cooler, the lock-up clutch being operable between an engaged state and a released state according to a difference between pressures of a working fluid in an engaging fluid chamber and a releasing fluid chamber, the oil cooler being connected to a fluid passage communicating with the engaging and releasing fluid chambers, and operable to cool the working fluid, the hydraulic control apparatus including an oil cooler by-pass valve operable to permit the working fluid to by-pass the oil cooler, and a low-temperature by-pass device operable to open the oil cooler by-pass valve, for permitting the working fluid to by-passes the oil cooler, when a temperature of the working fluid is lower than a predetermined lower limit.