INTERNAL COMBUSTION ENGINE AND SPARK PLUG THEREFOR

• Main Author: SUGIURA AKIMITSU
• Format: Patent
• Language: English; Japanese
• Published: 16.05.2023
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CORONA DEVICES; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARK GAPS; SPARKING PLUGS; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

To provide an internal combustion engine and a spark plug therefor which can achieve stable ignitability.SOLUTION: Disclosed is an internal combustion engine 10 equipped with a spark plug 1. The spark plug 1 has an insulator 3, a center electrode 4, a housing 2, a ground electrode 6 forming a first discharge gap G1 between itself and the center electrode 4, and a plug cover 5. The plug cover 5 has an injection hole 51 which brings a sub-combustion chamber 50 into communication with the outside. Viewing in a direction perpendicular to both a plug axis direction Z and an injection hole axis L of the injection hole 51, the first discharge gap G1 is formed at a position overlapping the injection hole axis L or at a position further on tip end side than the injection hole axis L. Between the center electrode 4 and the housing 2, a second discharge gap G2 is formed via a surface of the insulator 3. As a load on the internal combustion engine increases, a discharging position moves from the first discharge gap G1 to the second discharge gap G2.SELECTED DRAWING: Figure 1 【課題】安定した着火性を得ることができる内燃機関及び内燃機関用のスパークプラグを提供することができる。【解決手段】スパークプラグ１を備えた内燃機関１０。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、中心電極４との間に第１放電ギャップＧ１を形成する接地電極６と、プラグカバー５と、を有する。プラグカバー５は、副燃焼室５０と外部とを連通させる噴孔５１を有する。第１放電ギャップＧ１は、プラグ軸方向Ｚと噴孔５１の噴孔軸Ｌとの双方に直交する方向から見て、噴孔軸Ｌと重なる位置、若しくは噴孔軸Ｌよりも先端側の位置に、形成されている。中心電極４とハウジング２との間には、絶縁碍子３の表面を介した第２放電ギャップＧ２が設けてある。内燃機関の負荷の上昇に伴い、放電発生位置が、第１放電ギャップＧ１から第２放電ギャップＧ２へ移行するよう構成されている。【選択図】図１