Abstract: In an ignition coil device mainly mounted in an internal combustion engine, the installation can be improved even in an ignition coil having a bent leading end.

Abstract: An ignition coil apparatus for an internal combustion engine can prevent noise from being radiated to the outside from a transformer without requiring special man-hours even if a case takes a complex shape. The ignition apparatus is provided with a transformer (2) including a primary coil (4), a secondary coil (5) and an iron core 1, a case (3) with the transformer (2) received therein, and an insulating resin 6 filled in the case (3). A high voltage generated at a high voltage side of the secondary coil (5) upon interruption of a primary current supplied to the primary coil (4) is impressed to a spark plug (14). The case (3) is made of a conductive plastic.

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.

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.

Abstract: An ignition apparatus for an internal combustion engine can eliminate connecting leads for electrically connecting between an igniter and a connector can be eliminated or shortened. In the ignition apparatus, individual terminals (14a, 14b, 15a, 15b) in the form of connector side terminals of an igniter (9) are directly connected to individual terminals (10a, 10b, 11a, 11b) in the form of input terminals of a connector (8), and individual terminals (18a, 18b, 19a) in the form of transformer side terminals of the igniter (9) are directly connected to individual terminals (16a, 16b, 17a), respectively, which are winding terminals of a transformer (1).

Abstract: An ignition apparatus for an internal combustion engine can eliminate connecting leads for electrically connecting between an igniter and a connector can be eliminated or shortened. In the ignition apparatus, individual terminals (14a, 14b, 15a, 15b) in the form of connector side terminals of an igniter (9) are directly connected to individual terminals (10a, 10b, 11a, 11b) in the form of input terminals of a connector (8), and individual terminals (18a, 18b, 19a) in the form of transformer side terminals of the igniter (9) are directly connected to individual terminals (16a, 16b, 17a), respectively, which are winding terminals of a transformer (1).

Abstract: An ignition coil apparatus for an internal combustion engine can prevent noise from being radiated to the outside from a transformer without requiring special man-hours even if a case takes a complex shape. The ignition apparatus is provided with a transformer (2) including a primary coil (4), a secondary coil (5) and an iron core 1, a case (3) with the transformer (2) received therein, and an insulating resin 6 filled in the case (3). A high voltage generated at a high voltage side of the secondary coil (5) upon interruption of a primary current supplied to the primary coil (4) is impressed to a spark plug (14). The case (3) is made of a conductive plastic.