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:
Jul. 11, 2006
Filed:
Apr. 30, 2004
Masaru Morise, Nukata-gun, JP;
Akio Sugawara, Toyota, JP;
Hiroaki Takeuchi, Toyota, JP;
Yuji Yasuda, Nishikamo-gun, JP;
Masaru Morise, Nukata-gun, JP;
Akio Sugawara, Toyota, JP;
Hiroaki Takeuchi, Toyota, JP;
Yuji Yasuda, Nishikamo-gun, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
There is provided a hydraulic pressure control apparatus for a vehicular hydraulic power transmission device with a lock-up clutch, in which an increase in the temperature of hydraulic oil in an engagement side oil chamber is suppressed, durability of frictional material is improved, and the lock-up clutch is appropriately controlled. A switching control valve (a lock-up relay valveand a lock-up control valve) switches between connection and disconnection between each of two oil passages that communicate with an engagement side oil chamberand each of a high pressure oil passage and a low pressure oil passage, according to the operating state of the lock-up clutchFor example, when the lock-up clutch is completely engaged, the hydraulic oil is supplied to both the two oil passages from the high pressure oil passage, hydraulic pressure PON in the engagement side oil chamberis increased, and a sufficient transmission torque capacity of the lock-up clutchis obtained. When the lock-up clutchis in the slip state, one of the two oil passages is connected to the high pressure oil passage, and the other oil passage is connected to the low pressure oil passage such that the hydraulic oil is circulated in the engagement side oil chamberTherefore, an increase in the temperature of the hydraulic oil is suppressed, the lock-up clutchis cooled, and the durability of the frictional materialis improved.