Fuel injection valve for internal combustion engines

US7051958B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Detlev Potz · Stuttgart, DE
• Thomas Kuegler · Ditzingen, DE
• Andreas Koeninger · Pforzheim, DE
• Predrag Nunic · Stuttgart, DE
• Peter Boehland · Erbach, DE

Key dates

• Filing date: Jan 27, 2003
• Grant date: May 30, 2006
• Expiry date: Jun 29, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/46
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve for internal combustion engines, having a housing in which an outer valve needle and an inner valve needle guided in it are disposed in a bore. The outer valve needle controls an outer row of injection openings, and the inner valve needle controls an inner row of injection openings, to which rows of injection openings fuel is delivered at an injection pressure through a high-pressure conduit embodied in the housing. A control pressure chamber in the housing can be made to communicate with the high-pressure conduit, and by means of its pressure, a closing force is exerted at least indirectly on the inner valve needle. The high-pressure conduit communicates with a control chamber, by whose pressure a closing force is exerted at least indirectly on the outer valve needle, and the control chamber communicates with the control pressure chamber. A control valve is disposed in a housing, and by means of the control valve, the control chamber can be made to communicate with a leak fuel chamber.