RPM regulator for fuel injection pumps

US3970064A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

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

Key dates

• Filing date: Jan 3, 1975
• Grant date: Jul 20, 1976
• Expiry date: Jan 3, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D1/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An rpm regulator of a fuel injection pump for internal combustion engine includes a single-arm drag lever and an intermediate lever which are bent to define a space into which a compression spring extends. The stroke of the compression spring is limited in both directions by stops defined by the intermediate lever and the drag lever, respectively. The regulator also includes a control spring arrangement which engages one end of the drag lever, a fuel quantity setting member which engages one end of the intermediate lever and controls due to its movement the quantity of fuel delivered by the fuel pump and an rpm governor which exerts an rpm defendent force against the intermediate lever in opposition to the force of the control spring arrangement. With this regulator the pump can deliver an excess fuel quantity for starting purposes and an automatically reduced normal fuel injection quantity when the rpm increases. This result is accomplished without increasing the dimensions of the fuel pump.