EP 1519460 A2 20050330 - Method for producing a spark plug and spark plug
Title (en)
Method for producing a spark plug and spark plug
Title (de)
Herstellungsverfahren einer Zündkerze und Zündkerze
Title (fr)
Méthode de fabrication d'une bougie d'allumage et bougie d'allumage
Publication
Application
Priority
JP 2003373436 A 20030927
Abstract (en)
A method for producing a spark plug, the spark plug including: a center electrode; an insulator which holds the center electrode therein in a state where a tip end portion of the center electrode protrudes therefrom; a metal shell which holds the insulator therein; a ground electrode which is fixed to the metal shell, the ground electrode having an inner side face having a width that is smaller as it advances toward a tip end side, in a portion of the inner side face positioned between a pair of tapered faces; and a discharge portion which is bonded to the inner side face of the ground electrode by laser welding so as to attain a diameter of 0.8 mm or less and a height of 0.5 mm or more, a discharge gap being formed between the discharge portion and the tip end portion of said center electrode, the method including: forming the tapered faces before the discharge portion is laser-welded to the inner side face.
IPC 1-7
IPC 8 full level
H01T 13/39 (2006.01); H01T 21/02 (2006.01)
CPC (source: EP)
H01T 13/39 (2013.01); H01T 21/02 (2013.01)
Citation (applicant)
- JP 2002237365 A 20020823 - DENSO CORP
- US 2002105254 A1 20020808 - HORI TSUNENOBU [JP], et al
Designated contracting state (EPC)
DE FR
Designated extension state (EPC)
AL HR LT LV MK
DOCDB simple family (publication)
EP 1519460 A2 20050330; EP 1519460 A3 20130529; EP 1519460 B1 20160427
DOCDB simple family (application)
EP 04255860 A 20040924