Long life spark plug having consumable discharge member

Details Long life spark plug having consumable discharge member Long life spark plug having consumable discharge member

1992-09-28

1995-04-11

Yusko, Donald J.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313141, 123169EL, H01T 1320

Patent

active

054061660

ABSTRACT:
There is disclosed a spark plug which can maintain a low spark voltage for a long period of time even if a noble metal tip is used in a small amount. A discharge gap is formed between a central electrode and an earth electrode. The noble metal tip is formed on that end face of the central electrode facing the earth electrode. A cross-shaped groove is formed in that end face of the noble metal tip joined to the central electrode. The cross-shaped groove is exposed when the noble metal tip is consumed by a discharge developing in the discharge gap.

REFERENCES:
patent: 4122366 (1978-10-01), von Stutterheim et al.
patent: 4581558 (1986-04-01), Takamura et al.
patent: 4670684 (1987-06-01), Kagawa et al.
patent: 4840594 (1989-06-01), Moore
patent: 5007389 (1991-04-01), Kashiwara et al.
patent: 5202601 (1993-04-01), Takamura et al.

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