Patent ID: 6650219
Filing Date: 2003-11-18
Classification: H01F

Abstract:
An ignition coil module having a proximal longitudinal end and a distal longitudinal end, wherein the module defines longitudinal centerline, the module comprising:a primary coil for conducting primary electric current; a secondary coil and electromagnetically coupled to the primary coil; a bobbin disposed coincident with the longitudinal centerline of the module, wherein the bobbin has a sidewall having an inner surface defining a hollow interior space and an outer surface on which one of the coils is disposed; a ferromagnetic core disposed within the hollow interior space of the bobbin, the ferromagnetic core having a confronting area, wherein the confronting area is spaced from the inner surface of the sidewall of the bobbin; and a retainer that fits to a proximal end of the bobbin to capture the core within the bobbin; wherein the retainer comprises a ring that is disposed within the interior space and comprises formations that provide clearance to the bobbin sidewall to allow an encapsulant that is introduced into the interior space via the proximal end of the bobbin to flow past the retainer and fill an interior space between the core and the bobbin.