Fuel injection pump for internal combustion engines

US5307778A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karsten Hummel · Freising, DE
• Karl Rapp · Stuttgart, DE
• Hansjoerg Frey · Stuttgart, DE

Key dates

• Filing date: May 14, 1993
• Grant date: May 3, 1994
• Expiry date: May 14, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/102
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection pump for internal combustion engines, having a pump piston that is axially guided in a cylinder bushing which defines a pump work chamber there and is moved axially by a cam drive counter to the force of a restoring spring. The cam drive comprises a roller tappet connected to the pump piston whose roller rolls off on a cam of a camshaft driven by the internal combustion engine to be supplied. In the process, the roller is connected to the cylindrical part of the roller tappet by means of a roller pin disposed vertically to the axis of the roller tappet. This roller pin is axially secured by means of the contact of its axial ends to the wall of a bore that guides the roller tappet, for which purpose the transition area between the face ends, which extend vertically to the axis of the roller pin, and the circumferential area of the roller pin is part of a circular ring. The radius of the circular ring cross-section is adapted to the diameter of the wall of the roller tappet guide.