Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

2011-08-09

2011-08-09

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

Spark plugs

With specific joint structure

Reexamination Certificate

active

07994694

ABSTRACT:
A spark plug (1) for an internal combustion engine includes: a cylindrical insulator (2) having an axial hole (4) penetrating in a direction of an axis (C1); a center electrode (5) partially inserted in the axial hole (4); a metal shell (3) surrounding an outer periphery of the insulator (2) and which is fixed to the insulator (2) by means of a crimped portion (20) provided at a rear end portion of the metal shell (3); and a ground electrode (27) joined to the metal shell (3) such that a portion of the ground electrode (27) opposes a leading end portion of the center electrode (5) via a spark discharge gap (33), wherein the insulator (2) has an annular groove portion (23) which opposes an inner edge of the crimped portion (20).

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Extended European Search Report dated Jul. 8, 2008.

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