Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1996-03-15
1997-12-02
Horabik, Michael
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313140, H01T 1320
Patent
active
056939990
ABSTRACT:
A spark plug for an Internal combustion engine is provided. When it is assumed that the distance of a first spark gap (g1) defined by a central electrode (8) and a first grounding electrode (16) whose width is "A" and which is axially opposed to the central electrode, and a second spark gap (g2) defined by the central electrode and at least one second grounding electrode (21) whose width is "B" and which is opposed to the side surface of the central electrode, the relationship defined by 0.5.ltoreq..SIGMA.Bn/A.ltoreq.1.5 is established, wherein "n" represents the number of the second grounding electrode to reduce the discharge voltage of the spark plug and maintain a high heat resistance. Preferably, the spark plug satisfies the relationship defined by 0.1 mm.ltoreq.g2-g1.ltoreq.0.4 mm to improve the ignitability of the spark plug.
REFERENCES:
patent: 2518844 (1950-08-01), Wetzel
patent: 3719851 (1973-03-01), Burley
patent: 3870918 (1975-03-01), Senda et al.
patent: 4465952 (1984-08-01), Sato et al.
patent: 4983877 (1991-01-01), Kashiwara et al.
patent: 5189333 (1993-02-01), Kagawa et al.
Kanao Keiji
Osamura Hironori
Day Michael
Horabik Michael
Nippondenso Co. Ltd.
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