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:
Sep. 13, 2011
Filed:
Nov. 18, 2008
Atsuya Ohshima, Okazaki, JP;
Shigeo Tsuzuki, Takahama, JP;
Mitsugi Yamashita, Anjo, JP;
Haruki Shirasaka, Chiryu, JP;
Atsuya Ohshima, Okazaki, JP;
Shigeo Tsuzuki, Takahama, JP;
Mitsugi Yamashita, Anjo, JP;
Haruki Shirasaka, Chiryu, JP;
Aisin AW Co., Ltd., Aichi-ken, JP;
Abstract
A vehicle drive unit is provided which includes a hydraulic circuit capable of efficiently supplying a hydraulic pressure from an accumulator to a hydraulic servo while minimizing the capacity of the accumulator. In a hydraulic circuit included in a continuously variable transmission, an accumulator is connected through an electromagnetic switch valve to an oil passage connecting a clutch pressure control valve and a manual valve, a one-way valve for allowing oil to flow only in the direction from the clutch pressure control valve toward the accumulator and the forward clutch is provided in the oil passage. The electromagnetic switch valve switches an oil passage to a communicating state when the oil pump is driven and switches the oil passage to a shut-off state when the oil pump is stopped.