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:
Oct. 16, 2012
Filed:
Dec. 23, 2008
Yusuke Ogata, Toyota, JP;
Toshihiro Aoyama, Okazaki, JP;
Yusuke Ogata, Toyota, JP;
Toshihiro Aoyama, Okazaki, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A hydraulic control system of continuously variable transmission includes: a first sheave pressure regulating valve () that regulates a line pressure (Pl), which is used for hydraulic control as a source pressure, to obtain a first sheave pressure (Pin); a fail-safe valve () that selects and outputs any one of the first sheave pressure (Pin) or a fail-safe hydraulic pressure (second sheave pressure Pout) that is applied to a drive pulley () at the time of a failure due to an excessive first sheave pressure (Pin) to the drive pulley (); and a first regulator valve () and a second regulator valve () that regulate the line pressure (Pl). An output pressure (Psf) of the fail-safe valve () is supplied to the first and second regulator valves (and) in a feedback manner as a drive pulley () side hydraulic pressure to thereby regulate the line pressure (Pl).