Fuel injection pump for internal combustion engines

US4649883A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilfried Bohringer · Flein, DE
• Franz Eheim
• Gerald Hofer · Diez, DE
• Karl Konrath · Ludwigsburg, DE
• Helmut Laufer · Gerlingen, DE

Key dates

• Filing date: May 16, 1984
• Grant date: Mar 17, 1987
• Expiry date: May 16, 2004

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 which has a shutoff device for the fuel supply to the pump work chamber, comprising a magnetic valve, which controls an intake bore to the work chamber of the fuel injection pump. The fuel injection pump further has a relief conduit, which is connected by an annular slide on the pump piston with the suction chamber in order to terminate the effective supply stroke of the pump piston. In order to assure reliable shutoff of the fuel supply to the pump work chamber, a check valve is further disposed in the connection between the pump work chamber and the suction chamber, which check valve is closed, during the intake stroke of the pump piston, with the collaboration of the pressure drop from the suction chamber to the pump work chamber.