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1. US20140346945 - Spark plug

Office
United States of America
Application Number 14359175
Application Date 06.12.2012
Publication Number 20140346945
Publication Date 27.11.2014
Grant Number 08975809
Grant Date 10.03.2015
Publication Kind B2
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
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., Ltd.
Inventors Mai Nakamura
Agents Kusner & Jaffe
Priority Data 2011279811 21.12.2011 JP
Title
(EN) Spark plug
Abstract
(EN)

An ignition plug having a ceramic insulator with an axial bore, a metallic shell provided around the ceramic insulator, and a terminal electrode having a leg portion inserted into a rear end portion of the axial bore and a head portion projecting from the rear end of the ceramic insulator, wherein the length L of a portion of the ceramic insulator projecting from the rear end of the metallic shell is not less than 28 mm but not greater than 34 mm. The thickness t of the thinnest portion of the ceramic insulator is 1.0 mm or greater within a region which extends 5.5 mm from the rear end of the ceramic insulator toward the forward end side with respect to the direction of the axis.