Long life spark plug having minimum noble metal amount

Details Long life spark plug having minimum noble metal amount Long life spark plug having minimum noble metal amount

1993-05-28

1999-11-23

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

H01T 1320

Patent

active

059906022

ABSTRACT:
An economical spark plug for an internal combustion engine which has a long service life and by which a reduction in the discharge voltage and the use of the minimum amount of a noble metal can be achieved. The spark plug has an insulator, a center electrode supported by the insulator, and an earth electrode facing to the center electrode. A narrowed portion is arranged on a tip of an electrode material of at least one of the center electrode and the earth electrode. The narrowed portion includes a projection formed by extending the electrode material and a noble metal chip firmly connected to a terminal end of the projection. The electrode material is a nickel-base heat-resisting alloy. The noble metal chip is made of a Pt--Ir alloy essentially consisting of 90-100% by weight Pt and 0-10% by weight Ir. A diameter D of the narrowed portion is in a range of 0.6-1.2 mm. A thickness t of the noble metal chip is in a range of 0.16-0.8 mm. A length L of the narrowed portion including the thickness t of the noble metal chip is in a range of 0.8-1.5 mm.

REFERENCES:
patent: 4109633 (1978-08-01), Mitsudo et al.
patent: 4331899 (1982-05-01), Nishida et al.
patent: 4540910 (1985-09-01), Kondo et al.
patent: 4581558 (1986-04-01), Takamura et al.
patent: 4670684 (1987-06-01), Kagawa et al.
patent: 4700103 (1987-10-01), Yamaguchi et al.
patent: 4893051 (1990-01-01), Kondo
patent: 5159232 (1992-10-01), Sato et al.
patent: 5179313 (1993-01-01), Eves et al.
patent: 5202601 (1993-04-01), Takamura et al.
patent: 5273474 (1993-12-01), Oshima et al.

Affiliated with

Also associated with

Rating

Long life spark plug having minimum noble metal amount does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Long life spark plug having minimum noble metal amount, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long life spark plug having minimum noble metal amount will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1225244