Fuel injection device for an internal combustion engine

Details Fuel injection device for an internal combustion engine Fuel injection device for an internal combustion engine

2006-03-28

2006-03-28

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S447000, C123S506000

Reexamination Certificate

active

07017553

ABSTRACT:
A fuel injection apparatus having a high-pressure fuel pump and a fuel injection valve for each cylinder of an internal combustion engine, in which fuel pump has two pump pistons driven by the engine and delimiting a pump working chamber supplied with fuel from a tank. The second pump piston is guided to slide inside the first pump piston. The two pistons can be coupled so that they move as a unit during the delivery stroke or the second can be fixed in a passive position so that only the first executes a delivery stroke. The fuel injection valve a second injection valve element which is guided to slide inside a first injection valve element can be acted on by the pressure prevailing in a control pressure chamber which has a connection to the pump working chamber controlled by the second pump piston wherein the control pressure chamber is disconnected from the pump working chamber when the second pump piston is disposed in its passive position.

REFERENCES:
patent: 4146178 (1979-03-01), Bailey
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patent: 4437443 (1984-03-01), Hofbauer
patent: 4811899 (1989-03-01), Egler
patent: 5566660 (1996-10-01), Camplin et al.
patent: 6267306 (2001-07-01), Phillips et al.
patent: 6886535 (2005-05-01), Boehland

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