INJECTION SYSTEM WITH VARIABLE GEOMETRY ADOPTING AIR FLOW ACCORDING TO ENGINE RPM

摘要

The invention relates to a variable geometry injection system adopting an air flow as a function of the engine speed. The adjustment of the air flow supplied by the internal spin (7) associated with the nozzle (4) of the fuel injector supplied by an inlet tube (3) is ensured by a shutter (14) mounted axially movable and carried by bellows (20, 21, 23) connecting it to the inlet tube (3) and to the end piece (4). The pressure P1 of the fuel in the supply line acts on the bellows (20, 21, 23) to move the shutter (14) axially between a position for closing the orifices of the twist (7) at low speed and a maximum opening position at high speed.