Fuel injection valve for an internal combustion engine

US4417693A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Paul Fussner · Sindelfingen, DE
• Karl Hofmann · Neckarrems, DE
• Iwan Komaroff · Regensburg, DE
• Kurt Seifert · Eßlingen, DE
• Dietrich Trachte · Leonberg, DE
• Wilhelm Vogel · Stuttgart, DE
• Hans-Jorg Vogtmann · Markgröningen, DE

Key dates

• Filing date: Apr 29, 1982
• Grant date: Nov 29, 1983
• Expiry date: Apr 29, 2002

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/304
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To provide for coupling the injection needle of a Diesel injection valve with an inertia mass, and thereby provide for speed damping of the movement of the valve, the pressurized Diesel fuel is applied to a chamber (20,68) in the valve body (10,12,14), which slidably retains the needle valve element (18) at a location downstream of the inertia mass, the inertia mass subdividing the chamber into a spring or pressure chamber (20) and a damping chamber (68) forming a dead, or storage chamber for fuel, the inertia mass being slidable in the second chamber and the clearance between the inertia mass and the walls of the chamber forming a throttled connection duct so that, upon command to opening movement, the needle valve element will engage, after a short dead distance (v), the inertia mass (62) which must move against the flow resistance through the throttled connection upon shifting of fuel between the first and second chamber and thus damping the speed of operation of the valve element. The pressure differential at the two sides of the inertia mass will act on the entire cross-sectional area of the inertia mass, to provide high initial damping of the valve needle movement upon initia…