Creeping discharge spark plug

Details Creeping discharge spark plug Creeping discharge spark plug

1996-09-20

1998-08-11

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313130, 313131R, H01T 1352

Patent

active

057931518

ABSTRACT:
A spark plug in use for an internal combustion engine, includes an insulator placed in a metal shell in a manner to extend its front end beyond the metal shell, a center electrode is placed within an axial bore provided by the insulator, an outer electrode which is welded to a front end of the metal shell is so bent that a firing end of the outer electrode faces a front end of the insulator with a space therebetween to cause surface-spark discharges along a front end surface of the insulator and to cause a semi-surface spark discharge between the center electrode and the outer electrode, the front end of the center electrode is protroacted from a front end of the insulator by at most than 0.5 mm or retracted from the front end of the insulator by at most than 1.0 mm, and the firing end of the outer electrode is in line with the front end surface of the insulator, thereby optimizing a carbon-deposit cleaning performance of the spark plug with the semi-surface spark discharge, according to the invention.
In addition, a firing end portion of the center electrode has a slender noble metal tip in a preferred embodiment of the spark plugs of the invention.

REFERENCES:
patent: 2899585 (1959-08-01), Dollenberg
patent: 2957099 (1960-10-01), Dutterer
patent: 5440198 (1995-08-01), Oshima et al.
patent: 5448130 (1995-09-01), Matsutani et al.
Patent Abstracts of Japan, vol. 13, No. 544 (E-855), Dec. 6, 1989, & JP-A-01 225085 (NGK Spark Plug Co., Ltd.) Sep. 7, 1989, *abstract*.

Affiliated with

Also associated with

Rating

Creeping discharge spark plug does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Creeping discharge spark plug, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Creeping discharge spark plug will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-392186