Igniter plug structure having semicircular grooves

Details Igniter plug structure having semicircular grooves Igniter plug structure having semicircular grooves

1988-12-07

1990-09-04

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

With fluid feed or air vent

313 115, 313139, H01T 1332, H01T 1316

Patent

active

049547437

ABSTRACT:
This invention provides an igniter plug, having a plurality of grooves within an outer surface of an annular ground electrode (2), the diameter of which is reduced to about 13 mm. Each groove (6) generally has a semi-circular shape in cross section to allow air flow along the grooves (6), with the number of the grooves (6) in the range from 4 to 16, and the width of each groove is to about 1.0 mm to 2.5 mm. The semi-circular cross section of the grooves (6) makes it possible to provide a large surface for the grooves without increasing the amount of machining, thus, enhancing cooling efficiency when the air flows along the grooves.

REFERENCES:
patent: 1707741 (1929-04-01), Rabezzana
patent: 2076038 (1937-04-01), McKone
patent: 2874321 (1959-02-01), Summerer
patent: 3330985 (1967-07-01), Johnston
patent: 3825784 (1974-07-01), Lindsay
patent: 4771209 (1988-09-01), Ryan
"Development of Low Voltage Shunted Surface GAP Spark and Igniter Plugs for Reciprocating and Gas Turbine Engines", by L. H. Segall, WADC Technical Report, 55-191, Jan. 1955, p. 28.

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