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1. EP2797187 - SPARK PLUG

Office
European Patent Office
Application Number 12860714
Application Date 06.12.2012
Publication Number 2797187
Publication Date 29.10.2014
Publication Kind B1
IPC
H01T 13/20
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
13Sparking plugs
20characterised by features of the electrodes or insulation
F02P 13/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
13Sparking plugs structurally combined with other parts of internal-combustion engines
H01T 13/34
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
13Sparking plugs
20characterised by features of the electrodes or insulation
34characterised by the mounting of electrodes in insulation, e.g. by embedding
CPC
H01T 13/20
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
13Sparking plugs
20characterised by features of the electrodes or insulation
H01T 13/34
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
13Sparking plugs
20characterised by features of the electrodes or insulation
34characterised by the mounting of electrodes in insulation, e.g. by embedding
Applicants NGK SPARK PLUG CO
Inventors NAKAMURA MAI
Designated States
Priority Data 2011279811 21.12.2011 JP
Title
(DE) ZÜNDKERZE
(EN) SPARK PLUG
(FR) BOUGIE D'ALLUMAGE
Abstract
(EN) An object is to prevent breakage at a rear end portion of an insulator even in the case where a rear trunk portion of the insulator is long and/or the area of a flat portion of the insulator is small. An ignition plug 1 includes a ceramic insulator 2 having an axial bore 4, a metallic shell 3 provided around the ceramic insulator 2, and a terminal electrode 6 having a leg portion 6A inserted into a rear end portion of the axial bore 4 and a head portion 6B projecting from the rear end of the ceramic insulator 2. The length L of a portion of the ceramic insulator 2 projecting from the rear end of the metallic shell 3 is not less than 28 mm but not greater than 34 mm, and/or the flat portion 2F of the ceramic insulator 2 is 25 mm 2 or less. In such an ignition plug 1, the thickness t of the thinnest portion 2A of the ceramic insulator 2 is 1.0 mm or greater within a region which extends 5.5 mm from the rear end of the ceramic insulator 2 toward the forward end side with respect to the direction of the axis CL1. Further, the area D of a region AR where the projected area PA1 of the flat portion 2F overlaps with the projected area PA2 of a flat portion 6F is set to 8 mm 2 or greater.
(FR) L'invention vise à empêcher de façon plus fiable une détérioration dans une partie d'extrémité arrière d'un corps isolant, même si une partie de tronc d'extrémité arrière est longue, ou que la surface d'une partie plate du corps isolant est petite. A cet effet, l'invention porte sur une bougie d'allumage (1), laquelle bougie comporte : un isolateur (2) ayant un trou d'arbre (4) ; un corps (3) disposé autour du bord externe de l'isolateur (2) ; une partie pied (6A) traversant l'extrémité arrière du trou d'arbre (4) ; et une électrode terminale (6) comportant une partie tête (6B) exposée à partir de l'extrémité arrière de l'isolateur (2). Dans l'isolateur (2) : la longueur (L) d'une partie exposée à partir de l'extrémité arrière du corps (3) est entre 28 et 34 mm ; et la surface d'une partie plate (2F) n'est pas supérieure à 25 mm2. Dans la bougie d'allumage (1) du type mentionné ci-dessus, dans une plage qui s'étend à 5,5 mm à partir de l'extrémité arrière de l'isolateur(2), vers une pointe, dans la direction d'un axe (CL1), l'épaisseur (t) de la partie paroi la plus mince (2A) de l'isolateur (2) est d'au moins 1,0 mm. De plus, une surface (AR) dans laquelle une surface saillante (PA1) d'une partie plate (2F) chevauche une surface saillante (PA2) d'une partie plate (6F) a une surface (D) d'au moins 8 mm2.