Spark plug having an erosion resistant tip

Details Spark plug having an erosion resistant tip Spark plug having an erosion resistant tip

1992-10-13

1994-09-13

Yusko, Donald J.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313143, H01T 1320, H01T 1339

Patent

active

053471938

ABSTRACT:
In a center electrode for a spark plug, the center electrode is made of a heat-conductor core cladded with a nickel-alloyed metal. A recess is provided on the front end surface of the nickel-alloyed matrix and the columnar tip is made of a precious metal and fit in the recess in such a manner that a front end of the tip protracts from the recess. The outer surface of the tip is welded to an inner surface of the recess. The dimensional relationship of the components of the spark plug A, B, C, D, E, F and G is as follows: 0.3 mm.ltoreq.A.ltoreq.0.8 mm, 1.2A.ltoreq.B.ltoreq.3A, 0.1 mm.ltoreq.(C-A)/2.ltoreq.0.5 mm, D.ltoreq.(C-A)/2, E.ltoreq.B/4, 0 mm.ltoreq.F.ltoreq.0.5 mm and A/5.ltoreq.G.ltoreq.A/2, where A: a diameter of the columnar tip, B: a length of the columnar tip, C: a diameter of a front end of the nickel-alloyed metal, D: a length of a front end of the nickel-alloyed metal, E: a length of the front end of the tip which is protracted from the recess, F: a distance between a rear end of the tip and a front end of the heat-conductor core, G: a distance of a welding portion penetrated from the outer surface of the tip into the inner surface of the recess.

REFERENCES:
patent: 2955222 (1960-01-01), Beesch et al.
patent: 3146370 (1964-08-01), Van Duyne et al.
patent: 4700103 (1987-10-01), Yamaguchi et al.
patent: 4771210 (1988-09-01), Mohle et al.

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