SPARK PLUG FOR INTERNAL COMBUSTION AND INTERNAL COMBUSTION

• Main Author: SUGIURA AKIMITSU
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2021
• 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 a spark plug for an internal combustion, capable of easily increasing life, and provide the internal combustion with the same.SOLUTION: A spark plug 1 for an internal combustion, includes: a cylindrical insulator 3; a center electrode 4 held in an inner peripheral side of the cylindrical insulator 3 and projecting a tip end projection part 41 on a tip end side of the cylindrical insulator 3; a cylindrical housing 2 holding the cylindrical insulator 3 in the inner peripheral side; a cover part 5 provided to the tip end part of the housing 2 so as to cover at least one part of the tip end projection part 41; and a ground electrode 6 jointed to the cover part 5. A penetration hole 7 penetrating a sub-combustion chamber 50 with an external part is formed in the cover part 5. The ground electrode 6 is projected to the sub-combustion chamber 50 while being jointed to the inner peripheral surface of the penetration hole 7 in the cover part 5. The ground electrode 6 includes a discharge surface 61 forming a discharge gap G between the center electrode 4 and itself on the penetration hole 7 side.SELECTED DRAWING: Figure 1 【課題】容易に長寿命化を図ることができる、内燃機関用のスパークプラグ及びこれを備えた内燃機関を提供すること。【解決手段】内燃機関用のスパークプラグ１は、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の先端側に先端突出部４１を突出させた中心電極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、先端突出部４１の少なくとも一部を覆うようにハウジング２の先端部に設けられたカバー部５と、カバー部５に接合された接地電極６と、を有する。カバー部５には、副燃焼室５０と外部とを連通させる貫通孔７が形成されている。接地電極６は、カバー部５における貫通孔７の内周面に接合されると共に副燃焼室５０へ突出している。接地電極６は、貫通孔７側において中心電極４との間に放電ギャップＧを形成する放電面６１を有する。【選択図】図１