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:
Apr. 30, 2019
Filed:
Jan. 29, 2015
Honda Motor Co., Ltd., Tokyo, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
A hydraulic circuit for a transmission including a main pump and a sub pump is provided in which when the main pump and the sub pump are driven by an engine after it has been stopped for a long time, due to the internal pressure of a torque converter being low, a sufficient hydraulic pressure cannot be transmitted to a feedback port of a switching valve via a fifth oil passage; communication between a first port and a second port of the switching valve is cut off, and the oil discharged by the sub pump is therefore not supplied to a lubrication system via a sixth oil passage but is supplied via the path: second oil passage→first port of switching valve→fourth oil passage→first port and second port of second pressure regulating valve→torque converter.