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IGNITION COIL FOR INTERNAL COMBUSTION ENGINE

  • US 20170321648A1
  • Filed: 11/06/2015
  • Published: 11/09/2017
  • Est. Priority Date: 11/11/2014
  • Status: Active Grant
First Claim
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1. An ignition coil for an internal combustion engine, the ignition coil comprising:

  • a primary coil and a secondary coil;

    a coil case that includes a housing section and a high-voltage tower section, the housing section housing the primary coil and the secondary coil, the housing section being arranged outside a plug hole of a cylinder for an internal combustion engine in which an ignition plug is arranged, the high-voltage tower section being disposed in the housing section such that at least a section of the high-voltage tower section is located within the plug hole;

    a rubber seal that is attached to an outer periphery of the high-voltage tower section;

    a pole joint that is arranged within the plug hole and attached to the high-voltage tower section via the rubber seal;

    a resistor that is disposed in a tower insertion hole formed in a central portion of the high-voltage tower section;

    a coil spring that is continuously inserted in a joint insertion hole formed in the pole joint and a distal end side portion of the tower insertion hole to be in contact with the resistor; and

    a high-voltage cap that is attached to a proximal end side of the high-voltage tower section, and allows the resistor and a high-voltage winding end portion of the secondary coil to be electrically connected to each other, wherein;

    an inner diameter of a proximal end side portion of the tower insertion hole is larger than an outer diameter of a maximum outer diameter portion of the resistor;

    an inner diameter of the distal end side portion of the tower insertion hole is larger than an outer diameter of a proximal end side portion of the coil spring and is equal to or smaller than the outer diameter of the maximum outer diameter portion of the resistor; and

    the ignition coil is configured such that in a state where the coil spring is pulled out from the tower insertion hole, the maximum outer diameter portion of the resistor is restrained by the distal end side portion of the tower insertion hole, and a gap is formed between the resistor and the high-voltage tower section.

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