Fuel injection system for automotive vehicle, has needle of nozzle having pressure gradients caused by pressure applied by hydraulic spring and pressure in high pressure collector chamber

摘要

The fuel injector has the injector body (2) having a control valve (3) for controlling opening of feed (6) coming from a high pressure collector chamber, and a valve needle (25), pre-stressed by a sealing spring (24), which is opened and closed by pressure variation in the nozzle chamber (36). The needle of the valve (25) has pressure gradients (31,39,40) caused by pressure applied by a hydraulic spring (28) and by pressure in the feed of the high pressure collector chamber.