SPARK PLUG FOR INTERNAL COMBUSTION ENGINE

• Main Author: SUGIURA AKIMITSU
• Format: Patent
• Language: English; Japanese
• Published: 27.12.2021
• 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 for an internal combustion engine which can simplify its manufacturing process.SOLUTION: A spark plug 1 has: a cylindrical insulator 3; a center electrode 4 which is held on an inner peripheral side of the insulator 3 and protrudes from the insulator 3 toward a tip end side; a cylindrical housing 2 which holds the insulator 3 on the inner peripheral side; a ground electrode 6 which defines, on the inner peripheral side of the housing 2, a discharge gap G between itself and the center electrode 4; and a plug cover 5 which is provided at a tip end of the housing 2 such that the same covers a sub-combustion chamber 50 where the discharge gap G is located. The plug cover 5 is provided with a nozzle port 51 which brings the sub-combustion chamber 50 into communication with an outside. The ground electrode 6 has: a discharge-side end part 61 facing the discharge gap G; and a bonding-side end part 62 bonded to the housing 2. The discharge-side end part 61 is disposed further on a base end side in an axial direction Z than the bonding-side end part 62.SELECTED DRAWING: Figure 1 【課題】製造工程の簡素化を可能とする、内燃機関用のスパークプラグを提供すること。【解決手段】スパークプラグ１は、筒状の絶縁碍子３と、絶縁碍子３の内周側に保持されると共に絶縁碍子３から先端側に突出する中心電極４と、絶縁碍子３を内周側に保持する筒状のハウジング２と、ハウジング２の内周側において、中心電極４との間に放電ギャップＧを形成する接地電極６と、放電ギャップＧが配される副燃焼室５０を覆うようハウジング２の先端部に設けられたプラグカバー５と、を有する。プラグカバー５には、副燃焼室５０を外部に連通させる噴孔５１が設けられている。接地電極６は、放電ギャップＧに面する放電側端部６１と、ハウジング２に接合された接合側端部６２とを有する。放電側端部６１が、接合側端部６２よりも、軸方向Ｚの基端側に配置されている。【選択図】図１