Patent ID: 6186421
Filing Date: 2001-02-13
Classification: F02M

Abstract:
A fuel injector, comprising:a tubular injector body having an open, upper end and defining an axial fuel passage;a solenoid actuator assembly disposed in said injector body and including a spool-like bobbin with a central through-bore and a wound wire coil supported thereon;a fuel tube having a tubular portion and a lower circular flange portion radially extending from a lower terminal end of said tubular portion to contact said open, upper end of said injector body;a nonmagnetic valve guide having a guide cylindrical portion, extending axially downward through said central through-bore and closely encircled by said bobbin, and a guide circular flange portion radially extending from an upper end of said guide cylindrical portion and mating with said lower circular flange portion of said fuel tube;a cylindrical pole piece to be received by said fuel tube tubular portion and said guide cylindrical portion; anda valve armature disposed within said injector body downstream of said pole piece and guided through direct contact with said valve guide;wherein said injector body, said fuel tube, said pole piece, and said armature conduct a magnetic circuit upon energization of said solenoid actuator assembly to axially draw said valve armature to permit fuel injection.