Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a mobile needle for adjusting the flow of fuel through the injection valve and ending in a shutting head which engages a valve seat of the injection valve; an actuator for displacing the needle between a closing position and an opening position of the injection valve; a catch element which constitutes an upper end stroke of the needle and defines the opening position; and a mechanical damping device which is interposed between the needle and the catch element and which is adapted to generate on the needle an elastic force which opposes to the movement of the needle towards the opening position when the needle is in proximity of the catch element.

Abstract: A fuel injector provided with: an injection valve comprising an injection nozzle; a movable plunger for adjusting the flow of fuel through the injection valve and ending in a shutting head which engages a valve seat of the injection valve; an actuator for displacing the plunger between a closing position and an opening position of the injection valve; an annular backing element which constitutes an upper stroke end of the plunger and defines the opening position; and a hydraulic damping device which is adapted to generate on the plunger a hydraulic force which opposes the movement of the plunger towards the opening position when the plunger itself is close to the backing element.

Abstract: A fuel injector is disclosed for high atomization capacity, and is of the single-jet air-assisted type in which a stop valve moved by an electromagnetic actuator controls the formation of fuel jets through atomization holes contained in a distributor element after which there is disposed an auxiliary atomization chamber. The auxiliary atomization chamber is delimited internally at least partially by a truncated conical surface onto which there opens substantially radial holes for the provision of auxiliary air, the truncated conical surface being defined by a mixer element disposed with a seal between the distributor element and a cap which is snap-fitted to a casing of the fuel injector.