Quantity control valve

US5996556A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Horst Klinger · Ludwigsburg, DE
• Uwe Kuhn · Riederich, DE
• Marcel Wuest · Ditzingen, DE
• Bernd Roseneau · Tamm, DE
• Peter Traub · Stuttgart, DE
• Thomas Goettel · Schwaikheim, DE
• Gerd Loesch · Stuttgart, DE
• Sandro Soccol · Bietigheim-Bissingen, DE

Key dates

• Filing date: Jun 17, 1998
• Grant date: Dec 7, 1999
• Expiry date: Jun 17, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/34
• 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, with a longitudinal slide that is movable in a valve housing between a restoring spring chamber and a 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 in the control chamber is delivered past the longitudinal slide via a throttle or baffle valve. In the closing position, firstly, a cylindrical guide region of the longitudinal slide bounded on both sides by annular grooves blocks off an inlet bore. The guide region is wider than the diameter of the inlet bore. Secondly, it covers an outlet bore except for a partial intersection with the relieved annular groove shifted into the return in the opening direction of the longitudinal slide. By the disposition of the inlet and outlet bores in combination with the contour of the longitudinal slide, a zero quantity feed can be unambiguously represented in the blocking position of the longitudinal slide.