Fuel injector with hydraulic damping

摘要

A fuel injector (1) provided with: an injection valve (7) comprising an injection nozzle (3); a movable plunger (17) for adjusting the flow of fuel through the injection valve (7) and ending in a shutting head (20) which engages a valve seat (18) of the injection valve (7); an actuator (6) for displacing the plunger (17) between a closing position and an opening position of the injection valve (7); an annular backing element (25) which constitutes an upper stroke end of the plunger (17) and defines the opening position; and a hydraulic damping device (26) which is adapted to generate on the plunger (17) a hydraulic force which opposes the movement of the plunger (17) towards the opening position when the plunger (17) itself is close to the backing element (25).