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:
Jan. 01, 2013
Filed:
Apr. 20, 2009
Tomoyuki Fujita, Tokyo, JP;
Masamichi Sugihara, Tokyo, JP;
Hiroshi Shiozaki, Tokyo, JP;
Koichiro Akatsuka, Tokyo, JP;
Tomoyuki Fujita, Tokyo, JP;
Masamichi Sugihara, Tokyo, JP;
Hiroshi Shiozaki, Tokyo, JP;
Koichiro Akatsuka, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
A variable displacement vane pump includes a first and a second fluid pressure chamber () where the cam ring () is made eccentric to the rotor () by a pressure difference between the first and the second fluid pressure chamber (), a control valve () for controlling a pressure of the first and the second fluid pressure chamber () so that an eccentric amount of the cam ring () is reduced to be small with an increase in a rotation speed of the rotor (), and a flow amount limiting member () for limiting a discharge flow amount of the operating fluid in the second fluid pressure chamber () at the time the eccentric amount of the cam ring () to the rotor () becomes small by supplying the operating fluid to the first fluid pressure chamber () and by discharging the operating fluid from the second fluid pressure chamber ().