Fuel injection device for internal combustion engines

US6637409B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Achim Brenk · Remchingen, DE
• Wolfgang Klenk · Besigheim, DE
• Uwe Gordon · Markgröningen, DE
• Manfred Mack · Riedlingen, DE

Key dates

• Filing date: Jun 13, 2002
• Grant date: Oct 28, 2003
• Expiry date: Jun 13, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/8671
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a fuel injection system for internal combustion engines, including an electronically triggered control valve with an axial through bore, which is divided by two valve seats into three annular chambers, to which respectively a supply line for fuel at high pressure, a high-pressure line leading away to an injection valve, and a relief line are connected, and having a control piston, which is guided in the through bore and which has two valve sealing faces cooperating with the two valve seats, respectively, the control piston according to the invention has a further valve sealing face, which cooperates with the first valve seat and whose spacing from the first valve sealing face is at least equal to the spacing between the second valve sealing face and the second valve seat when the first sealing seat is closed. A communication between the supply line and the relief line is thus reliably prevented.