Fuel injection device for internal combustion engines, in particular a pump/nozzle for diesel engines

US4463725A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Laufer · Gerlingen, DE
• Heinz Kuschmierz · Gerlingen, DE

Key dates

• Filing date: Sep 28, 1982
• Grant date: Aug 7, 1984
• Expiry date: Sep 28, 2002

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection device is proposed which has a free piston hydraulically driven by a pump piston and controlling the relieving of the pump work chamber. To this end, the free piston is embodied in two parts, comprising a control piston and a relief piston displaceable relative thereto and oriented toward the pump work chamber. The two pistons enclose between them a relief chamber, which at the end of supply can be made to communicate via a relief conduit with a chamber of lower pressure. This free piston is also usable with fuel injection pumps which supply the injection quantity via a long pressure line to the injection nozzles located on the engine; however, it is particularly advantageously usable with a pump/nozzle, in which the injection pump and the injection nozzle are combined into a single component.