Fuel injection system for internal combustion engines

US6745750B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Egler · Stuttgart, DE
• Giovanni Ferraro · Firenze, IT
• Hansjoerg Egeler · Fellbach, DE
• Achim Brenk · Remchingen, DE
• Wolfgang Klenk · Besigheim, DE
• Peter Boehland · Erbach, DE
• Werner Teschner · Echterdingen, DE
• Sebastian Kanne · Stuttgart, DE
• Ingolf Kahleyss · Erbach, DE
• Uwe Gordon · Markgröningen, DE
• Manfred Mack · Riedlingen, DE

Key dates

• Filing date: Nov 25, 2002
• Grant date: Jun 8, 2004
• Expiry date: Nov 28, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system, having a fuel injection valve and a control valve, which control valve has a control valve member that is longitudinally displaceable in a control valve bore. A control valve sealing face is embodied on the control valve member; it cooperates with a control valve seat and thus controls the communication between a first pressure space and a second pressure space; the first pressure space communicates with a high-pressure collection chamber. In a valve body, a bore is embodied in which a pistonlike valve needle, with its end toward the combustion chamber, controls the opening of at least one injection opening by executing a longitudinal motion in response to the pressure in a pressure chamber; the pressure chamber communicates with the second pressure space via an inlet conduit. The first pressure space communicates via a throttle with a damping chamber, embodied as a blind bore and otherwise closed off, as a result of which pressure fluctuations that occur upon closure of the control valve are rapidly damped.