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. 08, 2003
Filed:
May. 24, 2001
Frank Gethöfer, Friedrichshafen, DE;
Wolfgang Reuter, Florstadt, DE;
Ralf Zischka, Schwäbisch Gmünd, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
Described is a radial piston pump with a pump housing ( ), which has a plurality of cylinder bores ( ) arrayed in star shape around a cam ( ), for the reception of pistons ( ) and possesses inlet ( ) and outlet ( ) when penetrate to each cylinder inner chamber ( ) with a therein compressible working volume. In accord with the invention, each cylinder inner chamber ( ) is provided with at least one relief opening, which connects the working volumes during a compression stroke of the piston ( ) with a space of lesser pressure for the reduction of the pressure gradient and also thereby reducing the noise of the pump.