Spark plug for internal combustion engine having platinum and ir

Details Spark plug for internal combustion engine having platinum and ir Spark plug for internal combustion engine having platinum and ir

1997-04-29

1999-02-09

Patel, Ashok

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

3131411, 313357, H01J 1320

Patent

active

058699210

ABSTRACT:
In a spark plug for an internal combustion engine, a spark gap is defined between an insulated sparking portion and a grounded sparking portion. At least one of the insulated sparking portion and the grounded sparking portion is made of a molten alloy composed of (a) 99 to 80 wt. % of Ir and (b) 1 to 20 wt. % of Pt. The insulated sparking portion can be a center electrode or a discharge chip attached to a free end of the center electrode, while the grounded sparking portion can be a ground electrode or a discharge chip attached to a free end of the ground electrode.

REFERENCES:
patent: 1850819 (1932-03-01), Waltenberg et al.
patent: 4122366 (1978-10-01), Von Stutterheim et al.
patent: 4324588 (1982-04-01), Zysk et al.
patent: 4488081 (1984-12-01), Kondo et al.
patent: 4581558 (1986-04-01), Takamura et al.
patent: 4771209 (1988-09-01), Ryan
Patent Abstracts of Japan, vol. 015, No. 423 (E-1127), Oct. 28, 1991 & JP 03 176979A (NGK Spark Plug Co Ltd), Jul. 31, 1991--Abstract.

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