Patent ID: 7150274

Claim:
An ignition device to be installed to extend between a cylinder head and a head cover of an internal combustion engine, the ignition device combining an ignition coil and a spark plug and comprising: a secondary coil of the ignition coil; a center electrode of the spark plug disposed apart from the secondary coil in a longitudinal direction of the ignition device; a cylinder shaped insulator made of an insulating material and having a coil surrounding portion surrounding the secondary coil and a plug surrounding portion surrounding the center electrode; a primary coil of the ignition coil wound on an outer circumferential face of the coil surrounding portion; a ground electrode of the spark plug disposed on an outer circumferential face of the plug surrounding portion; and a cylinder shaped tube made of a magnetic material and having a coil covering portion covering the primary coil and a plug covering portion covering the plug surrounding portion and the ground electrode, the coil covering portion and the plug covering portion being integrally formed in one piece, and an upper end portion of the coil covering portion being fitted to the head cover and the plug covering portion being press fitted in a plug hole of the cylinder head so that said coil covering portion and plug covering portion shield the ignition coil, the spark plug, and the insulator from lubricating oil in a space between the cylinder head and the head cover.