公开(公告)号：US20220077662A1

公开(公告)日：2022-03-10

申请号：US17528902

申请日：2021-11-17

申请人： DENSO CORPORATION

发明人： Daisuke SHIMAMOTO ,  Kaori DOI ,  Akimitsu SUGIURA ,  Syuhei NAKASHIMA ,  Kyosuke FUJITA

IPC分类号： H01T13/32 ,  H01T13/54 ,  F02B19/12 ,  F02P13/00

摘要： A spark plug includes a housing, a porcelain insulator, a center electrode, a ground electrode, and a prechamber-defining portion. The prechamber-defining portion has a prechamber formed therein. The prechamber-defining portion has a plurality of spray holes. At least one of the spray holes is an upstream spray hole which is arranged upstream of a plug center axis in a gas flow within a main combustion chamber and designed such that and an angle which an extension in an opening direction makes with an inner wall surface of the prechamber is selected to be larger than 90°. A spark gap is formed upstream of a plug center axis in the gas flow within the main combustion chamber.