Spark plug with specific measured parameters

Details Spark plug with specific measured parameters Spark plug with specific measured parameters

1998-12-09

2000-10-10

Patel, Vip

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313143, H01T 1320

Patent

active

061304980

ABSTRACT:
A spark plug has an insulator having a through hole extending in an axial direction thereof and an insulator leg portion at an end thereof, a resistor disposed in the through hole, a central electrode disposed in the through hole to face a central electrode side end face of the resistor and protruding from an insulator end face of the insulator leg portion, and a housing holding the insulator. A length between the insulator end face and the central electrode side end face of the resistor is equal to or larger than 1.5 times as large as a length of the insulator leg portion in the axial direction. Accordingly, temperature at a contact portion between the resistor and the central electrode is prevented from being increased, resulting in long life of the spark plug.

REFERENCES:
patent: 5514929 (1996-05-01), Kawamura

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