Fuel injection valve for internal combustion engines

US5743470A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Siegfried Schlaf · Weil der Stadt, DE
• Friedrich Boecking · Stuttgart, DE

Key dates

• Filing date: Dec 19, 1996
• Grant date: Apr 28, 1998
• Expiry date: Dec 19, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M45/083
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve for internal combustion engines includes a valve member, which is axially displaceable in a bore of a valve body and which on its end toward the combustion chamber of the engine has a conical valve sealing face. The conical valve sealing faced cooperates with a conical valve seat face on the closed end of the bore of the valve body toward the combustion chamber. Between the cone angles of the valve sealing face and the valve seat face, a seat angle difference is provided, by which an encompassing seat edge is formed between the valve member and the valve body, and having at least one injection port in the region of the valve seat phase adjoins the seat edge downstream thereof. For a reliable, defined line of contact on the sealing edge formed by the seat edge, the annular gap adjoining the seat edge downstream thereof, between the valve seat face and the valve sealing face of the valve member is enlarged by an encompassing radial recess between the seat edge and the inlet opening of the injection port.