Fuel injection pump for an internal combustion engine

US4065236A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerald Hofer · Diez, DE
• Gunter Bofinger · Leinfelden, DE
• Heinz Nothdurft · Stuttgart, DE
• Mohammad-Ali Khosrawi · Ludwigsburg, DE
• Helmut Simon · Göppingen, DE
• Karl Konrath · Ludwigsburg, DE

Key dates

• Filing date: Oct 17, 1975
• Grant date: Dec 27, 1977
• Expiry date: Oct 17, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M41/126
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The pump piston in a fuel injection pump is provided with longitudinal grooves which provide communication between the pressure chamber and the fuel supply chamber. An annular groove on the pump piston connects the longitudinal grooves so that communication between the pressure chamber and the fuel supply chamber is interrupted only after onset of the axial pressure stroke regardless of prior piston rotation.