Fuel injection valve for internal combustion engines

US7117842B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Boehland · Erbach, DE
• Sebatian Kanne · Stuttgart, DE
• Godehard Nentwig · Stuttgart, DE

Key dates

• Filing date: Mar 22, 2002
• Grant date: Oct 10, 2006
• Expiry date: May 7, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/46
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve in which a pistonlike outer valve needle is disposed longitudinally displaceably in a bore and cooperates with a valve seat to control at least one injection opening. A control chamber regulatable by a valve is provided and pressure in the control chamber exerts a closing force at least indirectly on the outer valve needle in the direction of the valve seat. A pressure face embodied on the outer valve needle is acted upon by the pressure in a pressure chamber, which is embodied between the outer valve needle and the wall of the bore and extends as far as the valve seat, so that an opening force on the outer valve needle results that is oriented counter to the closing force. An inner valve needle is guided in the outer valve needle and controls at least one additional injection opening and is acted upon by the pressure in the control chamber at least indirectly in the direction of the valve seat.