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. 28, 2015
Filed:
May. 28, 2010
Matteo Gasperini, Lavaiano-Fraz. Lari, IT;
Stefano Fiorini, Rochester Hills, MI (US);
Massimiliano Lazzerini, San Pietro in Palazzi, IT;
Raffaele Squarcini, Livorno, IT;
Matteo Gasperini, Lavaiano-Fraz. Lari, IT;
Stefano Fiorini, Rochester Hills, MI (US);
Massimiliano Lazzerini, San Pietro in Palazzi, IT;
Raffaele Squarcini, Livorno, IT;
Pierburg Pump Technology GmbH, Neuss, DE;
Abstract
A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine includes a shiftable control ring. The control ring comprises a plurality of pump chambers and a pressure relief valve. The plurality of pump chambers rotate through a charge zone and a discharge zone. A pump rotor comprises radially slidable vanes. The pump rotor rotates in the control ring. A pretensioning element pushes the control ring to a high pumping volume direction. A first control chamber pushes the control ring to a low pumping volume direction. A second control chamber pushes the control ring to the high pumping volume direction. A pump outlet is connected to the first control chamber. A throttle valve connects the first control chamber with the second control chamber. The pressure relief valve of the control ring connects the discharge zone to the second control chamber.