Radial piston pump with noise reduction

US6544007B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Frank Gethöfer · Tettnang, DE
• Wolfgang Reuter
• Ralf Zischka · Schwäbisch Gmünd, DE

Key dates

• Filing date: May 24, 2001
• Grant date: Apr 8, 2003
• Expiry date: May 24, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B49/24
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Described is a radial piston pump with a pump housing (3), which has a plurality of cylinder bores (5) arrayed in star shape around a cam (4), for the reception of pistons (6) and possesses inlet (7) and outlet (8) when penetrate to each cylinder inner chamber (9) with a therein compressible working volume. In accord with the invention, each cylinder inner chamber (9) is provided with at least one relief opening, which connects the working volumes during a compression stroke of the piston (6) with a space of lesser pressure for the reduction of the pressure gradient and also thereby reducing the noise of the pump.