Patent Number: 6,637,409

Title: Fuel injection device for internal combustion engines

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.

Inventors: Brenk; Achim (Kaempfelbach-Bilfingen, DE), Klenk; Wolfgang (Loechgau, DE), Gordon; Uwe (Markgroeningen, DE), Mack; Manfred (Altheim, DE)

Assignee: Robert Bosch GmbH

International Classification: F02M 59/00 (20060101); F02M 59/46 (20060101); F02M 59/20 (20060101); F02M 63/00 (20060101); F02M 59/36 (20060101); F02M 037/04 (); F15B 013/44 ()

Expiration Date: 10/28/2020