Spark plug and internal combustion engine equipped with the...

Internal-combustion engines – Igniters – Sparkers

Reexamination Certificate

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C313S141000, C313S142000

Reexamination Certificate

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07150252

ABSTRACT:
In a spark plug100, the nickel content of a center electrode20is greater than that of a ground electrode30. This enhances resistance to spark-induced consumption of the center electrode20. Also, the ground electrode30to which a noble-metal chip91is joined exhibits high resistance to spark-induced consumption. Accordingly, the spark plug100can be attached to either of a negative-polarity cylinder in which the center electrode20assumes a negative polarity, and a positive-polarity cylinder in which the center electrode20assumes a positive polarity. The noble-metal chip91is joined only to the ground electrode30, and a noble-metal chip is not joined to the center electrode20.

REFERENCES:
patent: 4670684 (1987-06-01), Kagawa et al.
patent: 5873338 (1999-02-01), Matsubara et al.
patent: 6819032 (2004-11-01), Matsubara
patent: 6864623 (2005-03-01), Ishikawa
patent: 6885135 (2005-04-01), Kanao et al.
patent: 2002/0158559 (2002-10-01), Sugiyama et al.
patent: 2003/0085644 (2003-05-01), Sugiyama et al.
patent: 2004/0061421 (2004-04-01), Morita et al.
patent: 2003-197347 (2003-07-01), None

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