Patent ID: 6334580
Filing Date: 2002-01-01
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 fixed valve seat defining a fuel valve aperture, 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 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 between said armature and said magnetic coil as part of a path leading to said fuel valve; and d) at least one fuel jet columnating device positioned below said fuel valve for receiving fuel flow from said valve aperture in a stream having a first transverse dimension, and for permitting said stream to widen into a funnel shaped section having a transverse dimension greater than said first transverse dimension, said funnel shaped section tapering in a direction of fuel flow, and to thereafter columnate said stream to a transverse dimension greater than the transverse dimension of said valve aperture.