Patent ID: 6897755
Filing Date: 2005-05-24
Classification: H01F

Abstract:
1. An ignition coil for an internal combustion engine comprising: an integrally formed resin spool and a coil constituted by a coil winding wound around said spool; and a high electric voltage being supplied to an ignition apparatus in the internal combustion engine, wherein said spool is provided with a cylinder portion around which said coil is wound, a collar portion protruding to an outer side in a diametrical direction from an end side outer peripheral surface of said outer portion so as to form a circumferential shape, and a reinforcing portion connected to said collar portion, extending in an axial direction of said cylinder portion and reinforcing said collar portion, and wherein a ratio of thickness (t/t0) of a thickness (t) of said collar portion and/or the reinforcing portion with respect to a thickness (t0) of said cylinder portion is equal to or less than 1.5.