Fuel injection pump for internal combustion engines

US5415533A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Egger · Wenzenbach, DE
• Kurt Oberklammer · Ybbs an der Donau, AT
• Heinz Popp · Schwanenstadt, AT
• Peter Baumgartner · Munich, DE
• Heinz Rathmayr · Salzburg, AT

Key dates

• Filing date: Jul 20, 1993
• Grant date: May 16, 1995
• Expiry date: Jul 20, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2307/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a fuel injection pump for internal combustion engines, having a pump piston guided in a cylinder bore of a pump body, which pump piston defines a pump work chamber in the cylinder bore and which is axially driven by a cam drive counter to the force of a restoring spring. Each individual cylinder of the engine to be fed is assigned a fuel injection pump, which is inserted into a bore in the engine housing; at the same time, the engine housing serves as the pump housing. In order to limit frictional wear, which is caused by the back-and-forth motion of the roller tappet of the cam drive guided in the engine housing and to easily replace pump parts, a thin-walled slide bush is disposed between the roller tappet and the housing bore. The slide bush is fastened with radial play on the pump body and additionally prevents the roller tappet from slipping out and prevents the preassembled fuel injection pump from falling apart when it is not installed in the housing bore.