FUEL ELECTRO-INJECTOR ATOMIZER FOR A FUEL INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

摘要

An atomizer of a fuel electro-injector for a fuel injection system for an internal combustion engine is equipped with a nozzle (11) and a valve needle (12) defining a discharge section (14) that is annular and has a width that continuously increases as the opening stroke of the valve needle (12) proceeds, starting from a closed position in which a head of the valve needle (12) is coupled to a sealing seat (21) of the nozzle (11); the atomizer has a passageway (16) around the lateral outer surface of the valve needle (12) to supply pressurized fuel to the discharge section (14); the passageway (16) axially terminates, on one side, at the sealing seat (21) and, on the other, at a dynamic seal (25) between the valve needle (12) and the nozzle (11); the diameter of the dynamic seal (25) is equal to the mean diameter of the sealing seat (21) of the nozzle (11).