Fuel injector for an internal combustion engine with hydraulic pin actuation

The injector (1) has 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 of the poppet type and is actuated by an electromagnetic actuator (22) in order to move between a closed position and an open position, in which it puts the control chamber (11) in communication with a low-pressure fuel exhaust passage (18).