Electromagnetically actuatable fuel injection valve

US4813599A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Max Greiner · Gerlingen, DE
• Udo Hafner · Munich, DE
• Waldemar Hans · Bamberg, DE
• Heinrich Knapp · Leonberg, DE
• Wolfgang Kramer · Jena, DE
• Rudolf Krauss · Stuttgart, DE
• Ferdinand Reiter · Markgröningen, DE
• Peter Romann · Stuttgart, DE
• Rudolf Sauer · Memmingen, DE

Key dates

• Filing date: Jun 17, 1987
• Grant date: Mar 21, 1989
• Expiry date: Jun 17, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M51/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an electromagnetically actuatable fuel injection valve which is used to supply fuel to a mixture compressing internal combustion engine. The fuel injection valve comprises a valve housing provided with an extension in which a valve seat body is disposed. A magnetic coil is mounted on each of the pole parts and a permanent magnet is disposed between the poles of the pole parts. The valve seat body is connected to a guide via a collet. The guide, collet and valve seat body are penetrated by a valve needle which is connected at its one end to an armature and which, at its other end, ends in a closing end. In the guide is a guide bore which is adapted to radially guide a spherical head portion of the valve needle and which then tapers into an abutment face, against which face the valve needle rests by way of the head when the injection valve is open. To open the valve, the valve needle is moved outwardly, thereby uncovering an ejection opening between a valve seat and the closing head. The valve seat body and collet may be screwed together for the purpose of adjusting the valve stroke.