Mitsubishi Denki Kabushiki Kaisha

Masahiro Iwa

Shigemi Murata

Nobuyuki Sawazaki

An ignition coil apparatus for an internal combustion engine can improve the ignition performance of the engine in an entire rotation range. The ignition coil apparatus is arranged in a plug hole formed in the engine, and includes a case (), a center core () arranged on a central axis of the case (), and a primary coil () and a secondary coil () both arranged on an outer periphery of the center core (). Magnets () are arranged on the opposite end faces, respectively, of the center core () for applying a magnetic force thereto in a direction opposite to the direction of magnetic flux lines generated when a primary current (i) is supplied to the primary coil (), and the primary coil () has a resistance, an upper limit value of which is 1.2 &#x3a9;.

Ignition coil apparatus for an internal combustion engine

To provide an ignition device for an internal combustion engine which for example prevents a crack from being made in a cast insulating resin or a transformer output voltage control element from being damaged. The ignition device for an internal combustion engine of the present invention includes: a transformer (); a case () that is composed of a case body () receiving the transformer (), and a high-tension tower () having an opening portion (); a cast insulating resin () that is injected into the case body () and cured and thus insulates and fixes the transformer (); a high-voltage connection terminal () that closes the opening portion () such that the cast insulating resin () that has not been cured is prevented from entering the high-tension tower (); a noise-suppressing resister () that is received in the high-tension tower (), is electrically connected to the high-voltage connection terminal (), and controls a voltage generated in the second winding in activating the transformer (); and a spring () that electrically connects the noise-suppressing resister () and a spark plug to each other, and urges the noise-suppressing resister () toward the high-voltage connection terminal ().

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Tokyo, Japan

Masahiro Iwa