Patent ID: 6928986
Filing Date: 2005-08-16
Classification: F02M

Abstract:
1. A fuel injector, comprising: an injector body defining a nozzle outlet and a high-pressure fuel chamber; a needle valve member mounted in the injector body and having an opening hydraulic surface substantially surrounded by a high pressure fuel line which is in fluid communication with the high-pressure fuel chamber, the needle valve member being movable between an open position and a closed position with respect to the nozzle outlet; a piezoelectric actuator being activated between an off position and an on position for positioning a control valve into one of an open position and a closed position; a control piston having a closing hydraulic surface, the control piston being positioned in mechanical communication with the needle valve member; a piston control chamber positioned between the control valve and the closing hydraulic surface of the control piston, the piston control chamber being in fluid communication with the control valve and the high-pressure fuel chamber via throttles; wherein