Pressure valve

US5161572A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Johann Oberl · Murr, DE
• Hermann Schmidt · Linz, DE
• Rolf Lutz · Reutlingen, DE

Key dates

• Filing date: May 15, 1991
• Grant date: Nov 10, 1992
• Expiry date: May 15, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7939
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pressure valve, which is installed in the delivery line leading from a fuel injection pump to a fuel injection valve, and which has a valve closing member opening in the direction of delivery, which is provided with a return collar. To achieve uniform injection, particularly a uniform curve of injection at a given load plotted against the speed, the opening rate of the connecting cross-section at the valve closing member is controlled by the guide part being provided immediately adjacent to the return collar, which guide part has three excisions at its circumference. These excisions are bounded by a flow channel guiding the valve closing member and have a defined flow cross-section of equal size, which in total is of the order of magnitude of the cross-section of the delivery line. With increasing stroke a total connecting cross-section is freed at the excisions by the boundary edge which limits the excisions at the side of the return collar and by the outlet edge of the flow channel, which connecting cross-section never becomes greater than the flow cross-section.