Patent ID: 6089467
Filing Date: 2000-07-18
Classification: F02M,Y02T

Abstract:
An electromagnetically operable fuel injector for a gaseous fuel injection system of an internal combustion engine, said injector having a generally longitudinal axis, which comprises:a) a ferromagnetic core;b) a magnetic coil at least partially surrounding the ferromagnetic core;c) an armature magnetically coupled to said magnetic coil and being movably responsive to said magnetic coil, said armature actuating a valve closing element which interacts with a fixed valve seat of a fuel valve and being movable away from said fixed valve seat when said magnetic coil is excited, said armature having a generally elongated shape and a generally central opening for axial reception and passage of gaseous fuel from a fuel inlet connector positioned adjacent thereto, said fuel inlet connector and said armature being adapted to permit a first flow path of gaseous fuel through a working gap between said fuel inlet connector and said armature and between said armature and said magnetic coil as part of a path leading to said fuel valve; andd) at least one first fuel flow aperture extending through a wall portion of said armature to define a second flow path of gaseous fuel as part of a path leading to said fuel valve, said at least one fuel flow aperture being dimensioned to provide predetermined fuel flows past said armature and through said armature.