Electromagnetically actuatable fuel injection valve

US4807846A · 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: Nov 24, 1987
• Grant date: Feb 28, 1989
• Expiry date: Nov 24, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S239/90
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electromagnetically actuatable fuel injection valve which serves to supply fuel to a mixture-compressing internal combustion engine having externally supplied ignition. The fuel injection valve includes a valve housing with a mouth piece in which a valve seat body is disposed, two magnet coils two cores and one armature, which has a spherical guide section and is connected to a valve needle. The spherical guide section is slidably supported with its circumference in a guide bore of the valve seat body and in its stroke movement away from the core is limited by a tapering stop opening which adjoins the guide bore. A plastic bushing is mounted on a guide step of the valve seat body and is pressed by a spring against the core end face, thereby preventing a dirct flow of fuel to the remnant air gap on the armature, as a result of which the depositing of soil particles in the gap is avoided.