Spark plug

Details Spark plug Spark plug

2008-11-12

2011-10-25

Patel, Ashok (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S142000

Reexamination Certificate

active

08044562

ABSTRACT:
There is provided a spark section (80) of needle-like shape protruding from an inner surface (33) of a ground electrode (30) to define a spark gap between the spark section and an electrode tip on a center electrode. The spark section (80) has a noble metal member (81) and an intermediate member (86) joined to each other. The materials of the noble metal member (81) and the intermediate member (86) are selected in such a manner that the thermal conductivity of the intermediate member (86) is lower than that of the noble metal member (81). This limits heat radiation through the heat radiation passage from the noble metal member (81) through the intermediate member (86) to the ground electrode (30) so as to maintain the noble metal member (81) at a higher temperature than conventional types and reduce a quenching effect of the noble metal member (81) on a flame core generated in the spark gap for improvement in ignition performance.

REFERENCES:
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patent: 2007/0128964 (2007-06-01), Hori
patent: 2007/0216277 (2007-09-01), Yoshida et al.
patent: 2009/0033195 (2009-02-01), Kameda
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patent: 2004-134209 (2004-04-01), None
patent: 2005-203110 (2005-07-01), None
patent: 2006-316344 (2006-11-01), None

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