Verfahren zur Herstellung einer Mittelelektrode und einer Zündkerze

Details

Veröffentlichungs-Nr.

EP2461439

Aktenzeichen

EP11191877

Anmeldetag

5. Dezember 2011

Veröffentlichung

13. Juni 2018

Erteilung

13. Juni 2018

Rechtsraum

EP

IPC

H01T21/02H01T13/20

Abstract

To provide a technology with which it is possible to accurately form a barrel portion of a center electrode of a spark plug. In steps of manufacturing a center electrode (20) of a spark plug, a cylindrical electrode member is prepared as the material of the center electrode, a medium diameter portion larger in diameter than small diameter portions (25, 26) is formed by an extrusion, and the small diameter portions (25, 26) are formed on the leading end side of the medium diameter portion by an extrusion, from the leading end to rear end of the electrode member. Then, when the cross-sectional area of a cross section of the medium diameter portion perpendicular to an axial direction is taken to be S1, and the cross-sectional area of a cross section of each small diameter portion (24, 25) perpendicular to the axial direction is taken to be S2, a barrel portion (24) of the center electrode (20) is formed by extruding the medium diameter portion when the value of ((S1-S2)/S1×100) is 30 or more.

Anmelder

Firmen

NGK SPARK PLUG CO., LTD.
NGK Sparkplug Co., Ltd.

Land

🇯🇵 Japan

Fachgebiete