Ignition device for an internal combustion engine
AssigneeDenso Corporation
InventorsTetsuya Miwa, Atsuya Mizutani, Takeo Maekawa, Hiromi Hiramatsu
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Abstract
An insulator includes a plug side cylindrical portion having an inner space for accommodating a center electrode and a coil side cylindrical portion extending in a direction departing from a combustion chamber. The high-voltage portion of an ignition coil is entirely accommodated inside the coil side cylindrical portion. According to this arrangement, the coil side cylindrical portion can assure insulation between the high-voltage portion and the low-voltage portion. The portion to be insulated and fixed by an insulating resin is limited only to the secondary winding.
Claims18
An ignition device for an internal combustion engine, comprising a spark plug having a center electrode accommodated in a cylindrical insulator made of a ceramic material for generating a spark discharge in a combustion chamber of an internal combustion engine and an ignition coil having a primary winding and a secondary winding for supplying high voltage to the spark plug, wherein
- said spark plug and said ignition coil are accommodated in a cylindrical casing and installed in a cylinder head of said internal combustion engine,
- said insulator comprises a plug side cylindrical portion having an inner space for accommodating said center electrode and a coil side cylindrical portion extending in a direction departing from said combustion chamber,
- said secondary winding is accommodated in said coil side cylindrical portion, and
- said plug side cylindrical portion and said coil side cylindrical portion are made of the same ceramic material.
An ignition device for an internal combustion engine, comprising a spark plug having a center electrode accommodated in a cylindrical insulator made of a ceramic material for generating a spark discharge in a combustion chamber of an internal combustion engine and an ignition coil having a primary winding and a secondary winding for supplying high voltage to the spark plug, wherein
- said spark plug and said ignition coil are accommodated in a cylindrical casing and installed in a cylinder head of said internal combustion engine,
- said insulator comprises a plug side cylindrical portion having an inner space for accommodating said center electrode and a coil side cylindrical portion extending in a direction departing from said combustion chamber,
- one of said primary winding and said secondary winding is directly wound around an outer surface of said coil side cylindrical portion, and
- said plug side cylindrical portion and said coil side cylindrical portion are made of the same ceramic material.
An ignition device for an internal combustion engine, comprising a spark plug having a center electrode accommodated in a cylindrical insulator made of a ceramic material for generating a spark discharge in a combustion chamber of an internal combustion engine and an ignition coil having a primary winding and a secondary winding for supplying high voltage to the spark plug, wherein
- said spark plug and said ignition coil are accommodated in a cylindrical casing and installed in a cylinder head of said internal combustion engine,
- said secondary winding is wound around an outer surface of a cylindrical spool and a center core is accommodated in said spool,
- an electrical insulating resin layer is provided on an outer cylindrical surface of said spool while no electrical insulating resin layer is provided on an inner cylindrical surface of said spool,
- said ceramic insulator comprises a plug side portion having an inner space for receiving the center electrode and a coil side portion extending away from said combustion chamber and accommodating at least a portion of said ignition coil, and
- said plug side cylindrical portion and said coil side cylindrical portion being made of the same ceramic material.
An ignition device for an internal combustion engine, comprising a spark plug having a center electrode accommodated in a cylindrical insulator made of a ceramic material for generating a spark discharge in a combustion chamber of an internal combustion engine and an ignition coil having a primary winding and a secondary winding for supplying high voltage to the spark plug, wherein
- said spark plug and said ignition coil are accommodated in a cylindrical casing and installed in a cylinder head of said internal combustion engine,
- at least one of said casing, said primary winding, and a center core of said ignition coil is disassemblable,
- wherein said ceramic insulator includes a plug side portion having an inner space for accommodating said center electrode and a coil side portion accommodating at least a portion of said ignition coil,
- wherein said secondary winding is accommodated in said coil side portion.
An ignition device for an internal combustion engine, comprising:
- a spark plug for generating a spark discharge in a combustion chamber of the internal combustion engine, said spark plug including a center electrode and an insulator made of a ceramic material;
- an ignition coil having a primary winding and a secondary winding for supplying high voltage to the spark plug;
- wherein said ceramic insulator comprises a plug side portion having an inner space for accommodating said center electrode and a coil side portion extending in a direction away from said combustion chamber to accommodate at least a portion of said ignition coil.
Dependencies are inferred from the claim text.