Fuel injection pump for an internal combustion engine

US6152708A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl-Friedrich Ruessler · Renningen, DE
• Berhard Bonse · Stuttgart, DE
• Wolfgang Braun · Ditzingen, DE
• Dieter Junger · Stuttgart, DE
• Joachim Kurz · Rochlitz, DE
• Roland Gronenberg · Echterdingen, DE
• Hubert Greif · Markgröningen, DE

Key dates

• Filing date: Dec 4, 1998
• Grant date: Nov 28, 2000
• Expiry date: Dec 4, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M41/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection pump for internal combustion engines, is proposed, with a distributor pump piston (6), which is supported in a housing bore (5) and on its jacket face, has a distributor groove (12), a filling groove (18), which is connected to a pressure relief chamber, and a pressure compensation surface (36). This filling groove constitutes a first leakage route (39) in the direction of the distributor groove (12) and constitutes a second leakage route (42) in the direction of an annular groove (20) in such a way that the pressure compensation surface, which is otherwise always closed by the inner wall of the bore (5), produces a high-pressure fuel supply by way of the first leakage route (39) in the direction of the pressure compensation surface (36) and this pressure compensation surface (36) is in turn relieved by way of the second leakage route (42) in the direction of the annular groove (20). The disposition of the pressure compensation surface (36) diametrically opposite the distributor groove (12) results in a very favorable compensation of the forces acting on the distributor pump piston during the high-pressure delivery phase, wherein by way of the pressure supply by me…