Patent ID: 6525636
Filing Date: 2003-02-25
Classification: H01F

Abstract:
An ignition coil for an engine comprising:a cylindrical core; a primary coil and a secondary coil wound around an outer periphery of the core; a primary spool around which the primary coil is wound and a secondary spool around which the secondary coil is wound, said primary spool and said secondary spool being coaxially disposed and extending in parallel so that one of said primary spool and said secondary spool is disposed radially within the other of said primary spool and said secondary spool; and a resin insulator filled around the core, wherein a resin material for molding at least said radially inner one of the primary spool and the secondary spool contains more than 5 weight % of rubber component and a reinforcing material for suppressing plastic deformation, whereby said rubber component is substantially uniformly distributed in the material of said radially inner spool and a toughness of said radially inner spool is thereby enhanced.