Plasma-jet spark plug and ignition system

Details Plasma-jet spark plug and ignition system Plasma-jet spark plug and ignition system

2007-12-11

2007-12-11

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Igniters

C073S035150

Reexamination Certificate

active

11723625

ABSTRACT:
A plasma-jet spark plug includes a metal shell, an electrical insulator retained in the metal shell, a center electrode held in an axial hole of the electrical insulator to define a cavity by a front end face of the center electrode and an inner circumferential surface of the insulator axial hole and a ground electrode arranged on a front end of the electrical insulator. The ground electrode has an opening defining portion defining an opening for communication between the cavity and the outside of the spark plug. The opening defining portion is located radially inside of or in contact with a first imaginary circular conical surface where the first imaginary circular conical surface has an axis coinciding with an axis of the spark plug and a vertex angle of 120° opening toward a front end of the spark plug and passing through a front edge of the insulator axial hole.

REFERENCES:
patent: 6611084 (2003-08-01), Teramura et al.
patent: 6973820 (2005-12-01), Watarai et al.
patent: 7234429 (2007-06-01), Abe et al.
patent: 2007/0114901 (2007-05-01), Nagasawa et al.
patent: 57-15377 (1982-01-01), None
patent: 2-72577 (1990-03-01), None
patent: 2006-294257 (2006-10-01), None

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