Spark plug and its manufacturing method

Details Spark plug and its manufacturing method Spark plug and its manufacturing method

2005-04-26

2005-04-26

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000, C313S124000, C313S133000, C313S136000, C313S138000, C313S142000, C313S144000, C445S007000

Reexamination Certificate

active

06885137

ABSTRACT:
Ir alloy firing tips are bonded on opposed surfaces of a center electrode and a ground electrode facing to a discharge gap. The configuration of a cross-sectional area of the Ir alloy firing tip taken along a plane perpendicular to the axis of the Ir alloy firing tip is out of round. In this cross-sectional area of this Ir alloy firing tip, when it is assumed that a circumscribed circle has a largest diameter A among virtual circles each contacting at least three portions of a visible outline of the cross-sectional area and an inscribed circle has a largest diameter B among inscribed circles each being coaxial with the circumscribed circle, a ratio of the diameter B to the diameter A (i.e., B/A) is equal to or larger than 0.8 and is less than 1.0.

REFERENCES:
patent: 5856724 (1999-01-01), Chiu et al.
patent: 5877584 (1999-03-01), Kato et al.
patent: 5977695 (1999-11-01), Osamura et al.
patent: 3000955 (1999-11-01), None

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