Zündkerze

Details

Veröffentlichungs-Nr.

EP2696453

Aktenzeichen

EP13179591

Anmeldetag

7. August 2013

Veröffentlichung

23. November 2016

Erteilung

23. November 2016

Rechtsraum

EP

IPC

H01T13/20H01T13/32H01T13/39

Abstract

A spark plug 1 includes a tip 31 joined to a center electrode 5. The coefficient of linear thermal expansion of the center electrode 5 is greater than that of the tip 31. The tip 31 has a gap-forming portion 31X having a maximum width of 1.2 mm or greater and forming a gap 28 in cooperation with the ground electrode 27 and a to-be-joined portion 31Y joined to the center electrode 5. At a position A which is shifted 0.1 mm from the forward end of the outer surface of the fusion portion 33 toward the forward end side, the width of the to-be-joined portion 31Y measured on the cross section is smaller than the width of the gap-forming portion 31X. The to-be-joined portion 31Y satisfies Dtw/Dw ‰¤ 1.1, where Dtw represents the width of the to-be-joined portion 31Y at the position A, and Dw represents the width of the fusion portion 33 at the forward end of the outer surface thereof.

Anmelder

Firma

NGK Spark Plug Co., Ltd.

Land

🇯🇵 Japan

Fachgebiete