Patent ID: 6913206

Claim:
Fuel injector for an internal combustion engine; the injector ( 1 ) comprising a cylindrical body ( 2 ), which houses an injection nozzle ( 4 ) regulated by an injection valve ( 5 ) provided with a moveable pin ( 8 ), a fuel supply channel ( 15 ), an injection chamber ( 6 ) communicating with the fuel supply channel ( 15 ), housing a lower portion of the pin ( 8 ) and delimited at the bottom by a valve seat ( 7 ) for the injection valve ( 5 ), a control chamber ( 11 ) communicating with the fuel supply channel ( 15 ) and housing an upper portion of the pin ( 8 ), and a control valve ( 19 ), which is actuated by an electromagnetic actuator device ( 22 ) in order to move between a closed position and an open position, in which it puts the control chamber ( 11 ) in communication with an exhaust conduit ( 18 ) for the fuel at low pressure; the injector ( 1 ) being characterised by the fact that the control valve ( 19 ) is a poppet valve that opens against the pressure of the fluid; an exhaust channel ( 17 ) parallel to the longitudinal axis ( 3 ) of the cylindrical body ( 2 ) and housed entirely within the cylindrical body ( 2 ) putting the control chamber ( 11 ) in communication with an exhaust conduit ( 18 ) and being regulated by the control valve ( 19 ), which comprises a valve seat ( 20 ) produced along the exhaust channel ( 17 ), and a valve body ( 21 ) moveable through the exhaust channel ( 17 ) under the thrust of the electromagnetic actuator device ( 22 ), which is housed entirely along the exhaust channel ( 17 ).