Fuel injection valve

US6938840B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ralf Trutschel · Naumburg, DE
• Frank Dallmann · Kornwestheim, DE

Key dates

• Filing date: Aug 25, 1999
• Grant date: Sep 6, 2005
• Expiry date: Aug 25, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/162
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injector, in particular a high pressure injector for direct injection of fuel into a combustion chamber of an internal combustion engine having externally supplied ignition and mixture compression, is characterized in that a valve needle, which is movable axially along a longitudinal axis of the valve, has a specially designed valve closing section on its downstream end. To open and close the valve, the valve closing section works together with a fixed valve seat. Swirl-producing elements are arranged upstream from the valve seat while a flattened face running perpendicular to the longitudinal axis of the valve is provided on the downstream end of the valve closing section downstream from the valve seat.