Fuel injection system

US5012787A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Udo Hafner · Munich, DE
• Harro Herth · Schwieberdingen, DE
• Wolfgang Kienzle · Hemmingen, DE
• Heinrich Knapp · Leonberg, DE
• Rudolf Krauss · Stuttgart, DE
• Manfred Lembke · Gerlingen, DE
• Werner Paschke · Schwieberdingen, DE
• Rudolf Sauer · Memmingen, DE

Key dates

• Filing date: Dec 7, 1987
• Grant date: May 7, 1991
• Expiry date: Dec 7, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M55/007
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system for internal combustion engines is proposed which serves the purpose of fuel injection into the air intake tube of the engine. The fuel injection system includes a fuel injection valve, which is supported upstream of a throttle valve in a holder body disposed coaxially in the air intake tube. A fuel supply line leads to the fuel injection valve, extending in a downwardly directed manner toward the fuel injection valve and away from a deaeration chamber. A fuel return line leads away from the fuel injection valve, extending in an upwardly inclined direction to discharge into the regulating chamber, disposed at a higher level, of a pressure regulating valve. A fuel feed line originating at a fuel supply pump terminates in an upwardly directed manner into the dearation chamber, which communicates via a dearation nozzle with the regulating chamber, so that vapor bubbles can escape upstream of the injection valve into the return side of the injection valve.