GLOW PLUG

To provide a glow plug capable of maintaining high conductivity between a cathode and a holding outer cylinder, and capable of maintaining high bond strength between the holding outer cylinder and a ceramic heater.SOLUTION: A glow plug 1 comprises a ceramic heater 3 and a holding outer cylinder 2A....

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Bibliographic Details
Main Authors MURAI HIROYUKI, NAKAO YASUSHI
Format Patent
LanguageEnglish
Japanese
Published 25.07.2019
Subjects
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
EXTINGUISHING-DEVICES
HEATING
IGNITION
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:To provide a glow plug capable of maintaining high conductivity between a cathode and a holding outer cylinder, and capable of maintaining high bond strength between the holding outer cylinder and a ceramic heater.SOLUTION: A glow plug 1 comprises a ceramic heater 3 and a holding outer cylinder 2A. A base end part with an anode 33 arranged in the ceramic heater 3 projects from the holding outer cylinder 2A to a base end side L2. In an axis direction L along center axes of the ceramic heater 3 and holding outer cylinder 2A, a base end 342 of a cathode 34 is positioned on a tip side L1 with respect to a base end 271 of an inclined contact part 27 of the holding outer cylinder 2A. A first distance D1 from the base end 271 of the inclined contact part 27 to the base end 342 of the cathode 34 in the axis direction L is equal to or more than 2 mm.SELECTED DRAWING: Figure 2 【課題】陰極と保持外筒との導通性を高く維持することができるとともに、セラミックヒータと保持外筒との接合強度を高く維持することができるグロープラグを提供する。【解決手段】グロープラグ１は、セラミックヒータ３及び保持外筒２Ａを備える。セラミックヒータ３における、陽極３３が配置された基端部は、保持外筒２Ａから基端側Ｌ２に突出している。セラミックヒータ３及び保持外筒２Ａの中心軸線に沿った軸方向Ｌにおいて、陰極３４の基端３４２は、保持外筒２Ａの傾斜当接部２７の基端２７１よりも先端側Ｌ１に位置する。軸方向Ｌにおける、傾斜当接部２７の基端２７１から陰極３４の基端３４２までの第１距離Ｄ１は、２ｍｍ以上である。【選択図】図２
Bibliography:Application Number: JP20180002969