Quantity control valve for a fuel injection system

US6170466A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Horst Klinger · Ludwigsburg, DE
• Uwe Kuhn · Riederich, DE
• Bernd Rosenau · Asperg, DE
• Peter Traub · Stuttgart, DE
• Thomas Goettel · Schwaikheim, DE
• Gerd Loesch · Stuttgart, DE
• Sandro Soccol · Bietigheim-Bissingen, DE
• Regis Blanc · Montbrison, FR
• Francois Rossignol · Montréal, CA
• Mathias Schumacher · Asperg, DE
• Andre Fromentoux · Mions, FR

Key dates

• Filing date: Jun 17, 1998
• Grant date: Jan 9, 2001
• Expiry date: Jun 17, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/0056
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a quantity control valve for a fuel injection system, used in internal combustion engines, which includes a longitudinal slide that is movable in a valve housing between a first and a second control chamber and that allocates the fuel, flowing in from at least one low-pressure pump, to at least one high-pressure pump. For driving the longitudinal slide, the inflowing fuel is delivered into the first control chamber via a throttle or baffle valve, past the longitudinal slide. In the second control chamber, there is either a restoring spring that urges the longitudinal slide in the direction of its closing position, or the longitudinal slide there has an effective face-end surface area upstream of which a control line containing a throttle valve ends; this end face is smaller in surface area than the effective surface area of the face end in the first control chamber. In the closing position, the longitudinal slide blocks off the outlet bore with one of its cylindrical guide portions, while with regard to the inlet bore it has a narrowed region, which opposite the longitudinal slide bore leaves a flow cross section open that changes gradually to zero in the d…