Fuel injection pump with an injection adjusting piston used for adjusting the onset of injection

US6116220A · kind A · utility

Assignees

• Robert Bosch GmbH · DE
• Adam Opel AG, a part interest · DE

Inventors

• Wolfgang Geiger · Plankstadt, DE
• Thomas Kulder · Steinheim, DE
• Andreas Sterr · Leverkusen, DE
• Wakter Fuchs · Stuttgart, DE
• Bernd Berghaenel · Mühlacker, DE
• Dieter Reitz · Heilbad Heiligenstadt, DE
• Wolfgang Fehlmann · Stuttgart, DE

Key dates

• Filing date: May 12, 1998
• Grant date: Sep 12, 2000
• Expiry date: May 12, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2001/186
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection pump, with an injection adjusting piston that serves to adjust the onset of injection, in which due to an off-center coupling to a cam part of the cam drive of a fuel injection pump embodied as a distributing injection pump, the injection adjusting piston is subjected to tilting moments during operation. In addition, the injection adjusting piston is subjected to other forces by means of a radially produced pressure fluid supply on a side of the injection adjusting piston disposed essentially opposite the coupling, and these other forces, together with the tilting moment forces, produce high, one-sided pressure loads in the radial direction on the injection adjusting piston. By producing a second pressure field, the injection adjusting piston undergoes a compensation of the above-mentioned forces acting on the injection adjusting piston and consequently experiences a significantly reduced radial load.