Spark plug for internal combustion engine and related...

Details Spark plug for internal combustion engine and related... Spark plug for internal combustion engine and related...

2007-03-14

2010-12-28

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S142000

Reexamination Certificate

active

07859178

ABSTRACT:
A spark plug is disclosed as having a metal shell, a porcelain insulator fixedly secured to the metal shell, a center electrode and a ground electrode providing a spark discharge gap with the center electrode. The porcelain insulator has a through-bore partially exposed from an end face of the ground electrode in a surface area S1, as viewed from a distal end of the spark plug, and having a total surface area S2falling in the relationship S1/S2≦0.3. The center electrode protrudes from the porcelain insulator with a protruding length L under the relationship L≦0.6 mm. A minimal value Hmin and a maximal value Hmax in distance between the ground electrode and the end face of the porcelain insulator lies in the relationship Hmax/Hmin≦1.3. Wall thickness T between the through-bore and an outer periphery of the porcelain insulator lies in the relationship T≦0.7 mm.

REFERENCES:
patent: 5877584 (1999-03-01), Kato et al.
patent: 6707237 (2004-03-01), Teramura et al.
patent: 2003/0028107 (2003-02-01), Miller et al.
patent: 2006/0028107 (2006-02-01), Hori et al.
patent: 10-041047 (1998-02-01), None
patent: 11-087014 (1999-03-01), None
patent: 2001-307858 (2001-11-01), None

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