Fuel-injection valve for internal combustion engines

US6874704B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Mack · Bad Rodach, DE
• Taner Narin · Bamberg, DE
• Holger Rapp · Hemmingen, DE
• Ulrich Kunzi · Winnenden, DE
• Ralf Heinecke · Freiberg, DE
• Wilhelm Christ · Michelbach an der Bilz, DE
• Friedrich Boecking · Stuttgart, DE
• Wolfgang Fleiner · Stuttgart, DE
• Manfred Fink · Weinsberg, DE

Key dates

• Filing date: Mar 26, 2002
• Grant date: Apr 5, 2005
• Expiry date: Mar 26, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M47/027
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve for internal combustion engines having a valve body in which a bore is embodied, a valve seat face, at least one injection opening embodied on the end toward the combustion chamber of the bore, and at least one injection opening connecting the bore with the combustion chamber of the engine. A nozzle needle is longitudinally displaceably guided in the bore and on its end toward the combustion chamber it has a sealing face, which cooperates with the valve seat face and thus controls the at least one injection opening. The nozzle needle has a central longitudinal bore, in which an inner needle is disposed that is fixed immovably relative to the valve body. The nozzle needle is guided over at least part of its length on the inner needle, so that the nozzle needle is kept exactly centrally in the bore at all times.