SPARK PLUG FOR INTERNAL COMBUSTION ENGINE, AND METHOD OF MANUFACTURING THE SAME

To provide a spark plug for an internal combustion engine capable of suppressing overheat of a plug cover, and to provide a method of manufacturing the same.SOLUTION: A spark plug 1 for an internal combustion engine has an insulator 3, a center electrode 4, a housing 2, a ground electrode 6, and a plug cover 5. The plug cover 5 is formed with an injection hole 51 for connecting between a sub-combustion chamber 50 and the exterior. When a thickness of the plug cover at a tip side from the ground electrode 6 is defined as t0, a thickness of a bonded part 59 of the plug cover to be bonded to a tip part of the housing 2 is defined as t1, a thickness of the tip part of the housing 2 is defined as t2, and a length of one bonding surface 11 of two bonding surfaces 11 appearing in a cross section including a plug central axis PC is defined as L, t1≥t0, t2≥1.5t1, and L≥1.5t1 are satisfied.SELECTED DRAWING: Figure 1 【課題】プラグカバーの過熱を抑制することができる内燃機関用のスパークプラグ及びその製造方法を提供すること。【解決手段】内燃機関用のスパークプラグ１は、絶縁碍子３と、中心電極４と、ハウジング２と、接地電極６と、プラグカバー５と、を有する。プラグカバー５には、副燃焼室５０と外部とを連通させる噴孔５１が形成されている。接地電極６よりも先端側におけるプラグカバーの厚みをｔ０、ハウジング２の先端部に対して接合されるプラグカバーの被接合部５９の厚みをｔ１、ハウジング２の先端部の厚みをｔ２、プラグ中心軸ＰＣを含む断面に表れる２つの接合面１１のうちの一方の接合面１１の長さをＬ、としたとき、ｔ１≧ｔ０、ｔ２≧１．５ｔ１、及び、Ｌ≧１．５ｔ１、を満たす。【選択図】図１