Fuel injection pump for internal combustion engines

US5273017A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Braun · Ditzingen, DE
• Dieter Junger · Stuttgart, DE
• Helmut Laufer · Gerlingen, DE

Key dates

• Filing date: Jun 11, 1992
• Grant date: Dec 28, 1993
• Expiry date: Jun 11, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/366
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection pump for internal combustion engines comprises a suction space, a fuel duct, an electrically actuated valve controlling the fuel duct, a fuel supply tank, a distributor having a distributing opening, a plurality of pressure ducts connectable with injection locations of an internal combustion engine via injection lines, a pump plunger which defines a pump work space connectable with the suction space during a suction stroke and during a control portion of the delivery stroke of the pump plunger via the fuel duct, while fuel is delivered from the fuel supply tank to the suction space connectable during a respective delivery stroke of the pump plunger via the distributor opening with one of the plurality of pressure ducts. The valve has a closing phase which determines a high pressure fuel delivery into the injection lines, a fuel return, and a bypass line is provided to a fuel return and branches from the fuel duct between the suction space and the valve.