US 7,441,552 B1Granted

Ignition coil apparatus for an internal combustion engine

AssigneeMitsubishi Electric Corporation

InventorsTomohito Matsui, Nobuyuki Sawazaki

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Abstract

The rotation of an ignition coil apparatus upon mounting thereof on an internal combustion engine is prevented with a simple structure, and the efficiency of mounting the ignition coil apparatus on the internal combustion engine is improved. A high voltage tower is formed integrally with a case main body having a transformer received therein, and holds a high voltage output terminal therein. A cylindrical plug boot has its one end attached to the high voltage tower. The plug boot is inserted into a plug hole in an internal combustion engine main body whereby the ignition coil apparatus is mounted on the internal combustion engine main body through a head cover having upstanding wall portions. A pair of protrusions for restricting the rotation of the casing main body around an axis of the plug hole are formed on a surface of the casing main body in opposition to the wall portions.

Claims4

Dependent claims

An ignition coil apparatus for an internal combustion engine comprising:

a transformer having a primary winding, a secondary winding and an iron core;
a case main body with said transformer received therein;
a high voltage tower that is formed integrally with said casing main body, and holds therein a high voltage output terminal for outputting a high voltage generated upon interruption of an excitation current flowing through said primary winding to the outside;
and
a cylindrical plug boot that has one end attached to said high voltage tower;
wherein said plug boot is mounted on an internal combustion engine main body through a head cover having upstanding wall portions by being inserted into a plug hole formed in said internal combustion engine main body;
and
a pair of protrusions for restricting the rotation of said casing main body around an axis of said plug hole are formed on a surface of said casing main body in opposition to said wall portions.

5 more elements

Dependencies are inferred from the claim text.