Long distance discharge gap type spark plug

Details Long distance discharge gap type spark plug Long distance discharge gap type spark plug

1977-10-11

1978-05-30

Grimm, Siegfried H.

Electric lamp and discharge devices

Spark plugs

Non-conducting material in or adjacent gap

313138, 313141, 313143, H01T 1332, H01T 1352

Patent

active

040925587

ABSTRACT:
A long distance discharge gap type spark plug comprising a center electrode, a porcelain insulator surrounding the center electrode and provided at its lower side with a firing portion made integral therewith and composed of a reduced diameter trunk wall, and a grounded electrode is disclosed. The spark plug comprises a surface gap L formed between the front end of the center electrode and the grounded electrode, a minor air gap l formed between the outer peripheral surface of the firing portion and the grounded electrode and a thickness t of the trunk wall of the firing portion and given by

REFERENCES:
patent: 2899585 (1959-08-01), Dollenberg
patent: 2900547 (1959-08-01), Engel
patent: 3295005 (1966-12-01), Poellet et al.
patent: 3538372 (1970-11-01), Terao

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