Patent ID: 7963270

Claim:
A fuel injector with high operation stability for an internal combustion engine, comprising: a metering servo valve including a control chamber having a fuel inlet and a fuel outlet configured to be supplied with fuel to control a rod configured to control fuel injection in the internal combustion engine; an open/close element configured to move for an axial stroke (C) to cooperate with a corresponding valve seat under the action of urging means to close the fuel outlet of the control chamber; and an electric actuator operable to act on the open/close element against the action of the urging means via an armature to open the fuel outlet of the control chamber, the armature being separate from the open/close element and configured to move for an axial stroke (I) greater than the axial stroke (C) of the open/close element; wherein respective weights of the armature and the open/close element, and respective lengths of the axial strokes (C, I) of the armature and the open/close element are sized so that when the fuel outlet of the control chamber closes, the armature impacts against the open/close element during a first rebound thereof away from the valve seat after de-energization of the electric actuator to oppose bouncing of the open/close element.