Fuel injection valve

US6279873A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Andreas Eichendorf · Schorndorf, DE
• Thomas Sebastian · Stuttgart, DE
• Guido Pilgram · Schwieberdingen, DE
• Rainer Norgauer · Stuttgart, DE

Key dates

• Filing date: Dec 9, 1999
• Grant date: Aug 28, 2001
• Expiry date: Dec 9, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve for a fuel injection system of an internal combustion engine, in particular for injecting fuel directly into the combustion chamber of the internal combustion engine. The fuel injection valve has a magnet coil, an armature that can be pulled by the magnet coil in a direction of lift against a first return spring, and a valve needle. The valve needle has a first stop surface for the armature, which can be moved relative to the valve needle. The armature is acted upon by a second return spring. In addition, a stationary second stop surface for the armature is provided. The second return spring acts upon the armature in a direction opposite to the lift and in an inoperative position, when the magnet coil is not energized, and holds the armature in contact with the second stop surface so that a distance between the armature and the first stop surface provided on the valve needle is predefined.