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:
Mar. 23, 2010
Filed:
Dec. 13, 2006
Applicants:
Takeshi Ueki, Haga-gun, JP;
Shingo Ishige, Haga-gun, JP;
Yoshinobu Yamada, Haga-gun, JP;
Inventors:
Assignee:
Showa Corporation, Gyoda-Shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 49/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a variable displacement pump, a first groove always connected to a second hydraulic chamber is provided in a slide surface of a cam ring facing to an end surface of a side plate, and a second groove always connected to a suction port is provided in the end surface of the side plate, whereby when the cam ring is moved to a moving end side in which a volumetric capacity of a pump chamber is reduced, the first groove and the second groove are connected, and the second hydraulic chamber can be connected to the suction port by the grooves.