Fuel injection apparatus

US5020498A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Linder · Mühlacker, DE
• Helmut Rembold · Stuttgart, DE
• Manfred Wier · Wenzenbach, DE

Key dates

• Filing date: Dec 18, 1989
• Grant date: Jun 4, 1991
• Expiry date: Dec 18, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a fuel injection apparatus having an injection nozzle opening at predetermined pressure, to which fuel is deliverable under pressure, the injection nozzle chamber communicates with a fuel supply line with the interposition of a check valve closing outward; the pressure in the fuel supply line is lower than the opening pressure of the injection nozzle. Furthermore, the injection nozzle chamber communicates with a work chamber of a spring-loaded work piston, the displacement motion of which for increasing the pressure in the nozzle chamber above the opening pressure of the injection nozzle is effected by relieving a second work chamber of the spring-loaded work piston under the influence of spring force.