Spark plug

Details Spark plug Spark plug

2006-08-31

2008-11-11

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

With specific joint structure

C313S143000, C313S118000, C029S888010, C445S007000

Reexamination Certificate

active

07449824

ABSTRACT:
A spark plug is provided with a metal shell and a ceramic insulator to support therein a center electrode. The ceramic insulator includes a front portion with a stepped outer surface, a middle portion, a rear portion and a shoulder portion defined between the middle and rear portions. A difference between the outer diameters of the middle and rear portions of the ceramic insulator is 1.8 mm or smaller. The metal shell includes a radially inward protrusion to retain thereon the stepped outer surface of the ceramic insulator and a rear end portion crimped onto the shoulder portion of the ceramic insulator. An inner circumferential surface of the crimped shell portion has a region held in contact with the insulator shoulder portion with a radially innermost point of the crimped shell portion being spaced radially apart from the ceramic insulator and axially apart from the insulator shoulder portion.

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