Fuel injection valve

US6244526A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dietrich Schuldt · Stuttgart, DE
• Ferdinand Reiter · Markgröningen, DE
• Martin Mueller · Heubach, DE
• Bo Yuan · Lo Wu, CN
• Andreas Eichendorf · Schorndorf, DE
• Christiane Glumann · Stuttgart, DE
• Thomas Sebastian · Stuttgart, DE
• Gerhard Stokmaier · Markgröningen, DE
• Rainer Norgauer · Stuttgart, DE
• Christian Preussner · Markgröningen, DE
• Rainer Schneider · Erlangen, DE
• Norbert Keim · Besigheim, DE
• Ottmar Martin · Lambach, DE

Key dates

• Filing date: May 21, 1998
• Grant date: Jun 12, 2001
• Expiry date: May 21, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F2007/1676
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A fuel injection valve for fuel injection systems of internal combustion engines includes a core which serves as the internal pole is made of a soft magnetic powder composite material. This powder composite material is an iron powder provided with a polymer additive, where the individual iron particles are coated with an electrically insulating layer. Such a powder composite material ensures a substantial minimization of eddy currents in the magnetic circuit in comparison with materials known previously, such as chromium steel, which are usually used as magnetic materials. The core which is mechanically sensitive and is sensitive to fuel is encapsulated at least with respect to the parts of the injection valve carrying the fuel. A sleeve passes through an internal longitudinal opening in the core which permits fuel flow in its interior and is fixedly attached to a pole part which seals the core toward the bottom. The core and the magnetic coil are thus not exposed to any wetting by fuel. This fuel injection valve is especially suitable for use in fuel injection systems of internal combustion engines with mixture compression and external ignition.