Ignition coil core isolation
AssigneeVisteon Global Technologies, Inc.
InventorsAlex William Widiger, David Charles Stine, Todd Christopher Sexton, William Douglas Walker
Life of this patent
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Abstract
A pencil ignition coil assembly module (40) that has a frusto-conically tapered core (46) and encapsulation (280) surrounding the side of the core. Features (216, 230, 234) center the core to a bobbin 48. A retainer (240, 240A) captures the core within the bobbin.
Claims13
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.
An ignition coil module having a proximal longitudinal end and a distal longitudinal end, wherein the module defines a longitudinal centerline, the module comprising:
- a primary coil for conducting primary electric current;
- a secondary coil 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 molded synthetic part disposed interiorly in the bobbin, wherein the molded synthetic part comprises formations that allow the core to be aligned with the longitudinal centerline of the module;
- wherein the formations comprise a first formation in the molded synthetic part toward the proximal longitudinal end of the module and a second formation in the molded synthetic part toward the distal longitudinal end of the module such that the second formation comprises raised surface areas that in radial cross section are inclined at an acute angle to the module longitudinal centerline of the module and act to center the core to the bobbin;
- and
- a ferromagnetic core disposed within the hollow interior space of the bobbin, the core having a confronting area, wherein the confronting area is spaced from the inner surface of the sidewall of the bobbin.
An ignition coil module having a proximal longitudinal end and a distal longitudinal end, wherein the module defines a longitudinal centerline, the module comprising:
- a primary coil for conducting primary electric current;
- a secondary coil 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, and further comprising a molded synthetic part;
- a retainer fitting to a proximal end of the bobbin to capture the core within the bobbin;
- and
- a ferromagnetic core disposed within the hollow interior space of the bobbin, the core having a confronting area, wherein the confronting area is spaced from the inner surface of the sidewall of the bobbin.
Dependencies are inferred from the claim text.