Patent ID: 6422488
Filing Date: 2002-07-23
Classification: F02M,Y02T

Abstract:
An electromagnetically operable fuel injector for a gaseous fuel injection system of in internal combustion engine, said injector having a generally longitudinal axis, the electromagnetically operable fuel injector comprising:a) a magnetic coil; b) 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 an aperture of predetermined dimension for passage of fuel therethrough, said armature having a generally elongated shapes a generally central opening for axial reception and passage of gaseous fuel from a fuel inlet connector positioned adjacent thereto, and at least one first fuel flow aperture extending through a wall portion of said armature, 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 and adapted to permit a second flow path of gaseous fuel from the central opening through the at least one first fuel flow aperture; c) a valve body surrounding and guiding said armature, said valve body having at least one aperture in a wall portion thereof for receiving said first flow path of gaseous fuel, said second flow path of gaseous fuel bypassing said at least one aperture; and d) an orifice device positioned downstream of said fuel valve defining an orifice for reception of fuel from said fuel valve, said orifice being of lesser dimension than said aperture of said fixed valve seat.