Fuel injection pump for internal combustion engines

US4409939A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Franz Eheim
• Gerald Hofer · Diez, DE
• Helmut Laufer · Gerlingen, DE

Key dates

• Filing date: Feb 6, 1981
• Grant date: Oct 18, 1983
• Expiry date: Feb 6, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/32
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system is proposed which has a high-pressure pump, a fuel reservoir determining the injection pressure, and an intermediate piston, during whose first half-stroke meters fuel under low pressure and during a second half-stroke, driven by the reservoir, injects the metered fuel. In order to vary the duration of injection, the pressure in the reservoir is determined either by means of the supply quantity of the high-pressure pump or by means of an appropriate pressure control valve in an outflow conduit.