Spark plug with specific construction to avoid unwanted surface

Details Spark plug with specific construction to avoid unwanted surface Spark plug with specific construction to avoid unwanted surface

1998-11-10

2000-06-20

Patel, Vip

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313130, 313143, H01T 1320

Patent

active

060781300

ABSTRACT:
A spark plug for an internal combustion engine comprises a tubular metal ground shell, a first electrode passing through the interior of the shell, a ceramic insulator sealing the space between the shell and the first electrode and a second electrode extending from the shell to define a gap with the first electrode. The ratio of effective distance along the surface of the ceramic defining the potential surface discharge path to the distance between the first and second electrodes being selected to prevent surface discharge as the spark gap erodes.

REFERENCES:
patent: 4939409 (1990-07-01), Friese et al.
patent: 5612586 (1997-03-01), Benedikt et al.

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