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:
Dec. 08, 2009
Filed:
Nov. 21, 2007
Masaaki Nishikata, Fukuoka, JP;
Tsuyoshi Kusakabe, Chikushi, JP;
Tsukasa Hojo, Hirakata, JP;
Ken Yamamoto, Osaka, JP;
Masaki Nagano, Ibaraki, JP;
Masaaki Nishikata, Fukuoka, JP;
Tsuyoshi Kusakabe, Chikushi, JP;
Tsukasa Hojo, Hirakata, JP;
Ken Yamamoto, Osaka, JP;
Masaki Nagano, Ibaraki, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state.