SPARK PLUG AND MANUFACTURING METHOD FOR THE SAME

• Main Author: KIMURA JUNJI
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CORONA DEVICES; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARK GAPS; SPARKING PLUGS

To provide a spark plug capable of checking a position of a ground electrode after being installed in an internal combustion engine.SOLUTION: A spark plug 1 includes an insulation body 50 and main metal fittings 30. The main metal fittings 30 have a mounting portion 35 that is attached to an internal combustion engine, a ground electrode 41 provided on the leading edge of the mounting portion 35, and a seat portion (large diameter portion) 34 located at the rear end of the mounting portion 35 and having a larger diameter than the mounting portion 35. An overhang portion 62 protruding radially outwardly from a portion of the surface of the main metal fittings 30 is formed at the rear end side than the seating portion 34 including the seating portion 34.SELECTED DRAWING: Figure 1 【課題】内燃機関に取り付けられた後に接地電極の位置を確認することのできるスパークプラグを提供する。【解決手段】スパークプラグ１は、絶縁体５０と、主体金具３０とを備えている。主体金具３０は、内燃機関に取り付けられる取付け部３５と、取付け部３５の先端側に設けられている接地電極４１と、取付け部３５の後端側に位置し、取付け部３５よりも径の大きい座部（大径部）３４とを有している。座部３４を含む座部３４よりも後端側には、主体金具３０の表面の一部から径方向外側に突出する張り出し部６２が形成されている。【選択図】図１