Fuel injection valve for internal combustion engines

US6892965B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rainer Haeberer · Bretten, DE
• Markus Ohnmacht · Stuttgart, DE
• Wilhelm Christ · Michelbach an der Bilz, DE
• Ralf Maier · Neuendorf, DE
• Stefan Haug · Waldenbuch, DE
• Wolfgang Fleiner · Stuttgart, DE
• Markus Rueckle · Stuttgart, DE

Key dates

• Filing date: Jun 27, 2001
• Grant date: May 17, 2005
• Expiry date: Jan 16, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/30
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Disclosed is a fuel injection valve including a valve body and a bore, embodied as a blind bore, whose bottom face is oriented toward the combustion chamber, and a conical valve seat having at least one injection port is disposed, is embodied on the bottom face. In the bore, a pistonlike valve member, which is longitudinally displaceable counter to a closing force, is disposed and has a valve member tip, which in the closing position of the valve member comes to rest on the valve seat. A first conical face and a second conical face, disposed toward the combustion chamber toward the first conical face, are embodied on the valve member tip, and the cone angle of the first conical face is smaller than the cone angle of the valve seat, which in turn is smaller than the cone angle of the second conical face. One annular groove is embodied between the first conical face and the second conical face, and an additional encompassing annular groove is disposed on the second conical face and at least partly coincides with the injection ports in the closing position of the valve member, so as to supply all the injection ports uniformly with fuel even if the valve member is off its axis.