Radial piston pump for high pressure fuel supply

US6446604B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Josef Guentert · Gerlingen, DE
• Bernd Streicher · Echterdingen, DE
• Kasim-Melih Hamutcu · Stuttgart, DE

Key dates

• Filing date: Aug 25, 2000
• Grant date: Sep 10, 2002
• Expiry date: Aug 25, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B1/0426
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common rail injection system. The piston pump has a drive shaft which is eccentrically supported in a pump housing and on which a ring is slidingly supported. The ring cooperates with a plurality of pistons, disposed radially relative to the drive shaft in a respective cylinder chamber. The pistons are movable radially back and forth in the respective cylinder chamber by rotation of the drive shaft. To increase the efficiency of the engine, the cylinder chambers are filled with less fuel when demand drops. In this so-called partial element filling, in which a plate is retained in contact with a polygonal ring, increased wear and damage are prevented. The wear is brought about by a guide device which prevents rotation of the ring about its own axis.