Radial piston machine

US6652244B2 · kind B2 · utility

Assignee

• ZF Lenksysteme GmbH · DE

Inventors

• Anton Ihring · Heubach, DE
• Michael Reichenmiller · Schwäbisch Gmünd, DE

Key dates

• Filing date: Feb 8, 2002
• Grant date: Nov 25, 2003
• Expiry date: Apr 11, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B1/0413
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A radial piston machine, e.g., a radial piston pump, in which an eccentric, rotatable on a stationary axle, drives multiple radially arranged pistons via an external sliding ring. Since a pump of this type operates with intake regulation, the delivery chambers are only partially filled above a middle speed range. Therefore, pressure surges, which cause noises, arise upon the impact of the piston on the oil volumes to be pushed out. These pressure surges may be reduced if a flexible circlip is positioned between the external sliding ring and the eccentric. Such a circlip allows the piston to deflect slightly together with the external sliding ring at the beginning of the pressure stroke, so that pressure peaks are suppressed and the noises are reduced. The flexibility of the circlip is increased using openings, which are positioned along the central axis, i.e., in the plane of the piston axle.