Fuel injection pump

US3942914A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerald Hofer · Diez, DE
• Karl Konrath · Ludwigsburg, DE

Key dates

• Filing date: Oct 8, 1974
• Grant date: Mar 9, 1976
• Expiry date: Oct 8, 1994

Classification

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

Abstract

A fuel injection pump for internal combustion engines includes a pump piston whose simultaneous reciprocation and rotation distributes pressurized fuel to the several injection nozzles of the engine. In order to shift the onset of fuel injection towards a later time during the delivery stroke of the piston, relief channels are disposed in the piston and in the surrounding cylindrical bushing. An annular slide, moving coaxially with respect to the piston, cooperates with the terminal apertures of one or more of these relief channels to relieve the fluid pressure in the working chamber of the pump, thereby interrupting fuel injection to the nozzles of the engine.