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. 23, 2013
Filed:
Aug. 01, 2006
Giacomo Armenio, Livorno, IT;
Bernardo Celata, Livorno, IT;
Giacomo Armenio, Livorno, IT;
Bernardo Celata, Livorno, IT;
Pierburg Pump Technology Italy S.p.A., Lanciano, IT;
Abstract
A variable-eccentricity vane pump having a rotor fitted with blades; an adjusting ring housing the rotor; elastic means for forcing the adjusting ring into a maximum-eccentricity position with respect to the rotor; a first sliding member connected to the adjusting ring and which slides in fluidtight manner inside a first chamber connected hydraulically to a delivery conduit of the pump; and a second sliding member connected to the adjusting ring and which slides in fluidtight manner inside a second chamber connected hydraulically to a delivery conduit of the pump. The first sliding member is connected to the adjusting ring on the opposite side to the elastic means and the second sliding member; and the second chamber is smaller than the first chamber, and has a drain opening formed in a lateral wall on which the second sliding member slides.