SPARK PLUG FOR INTERNAL COMBUSTION ENGINE

WIPO Patent Application WO/2022/004440

A1

A spark plug (1) for an internal combustion engine includes an insulator (3), a central electrode (4) having a distal end protruding portion (41), a housing (2), a grounding electrode (6), and a plug cover (5). Injection holes (51) providing communication from an auxiliary combustion chamber (50) to the outside are provided in the plug cover (5). The injection holes (51) are formed in such a way that the introduction of a gas flow into the auxiliary combustion chamber (50) through the injection holes (51) generates a swirling flow in the auxiliary combustion chamber (50). The auxiliary combustion chamber (50) includes a pocket portion (59), which is an annular space, between the outer circumferential surface of the insulator (3) and the inner circumferential surface of the housing (2). The outer circumferential surface of the insulator (3) includes an insulator inclined surface (31) which contracts diametrically with increasing distance toward the distal end side, in a position opposing the pocket portion (59). The inner circumferential surface of the housing (2) includes a housing inclined surface (21) which contracts diametrically with increasing distance toward the base end side, in a position opposing the pocket portion (59).

JP2013149623	SPARK PLUG
JPS58144076	【考案の名称】火花点火機関の点火プレ-ト
JP2006291888	IGNITION COIL FOR INTERNAL COMBUSTION ENGINE

SUGIURA AKIMITSU (JP)

PCT/JP2021/023284

January 06, 2022

June 21, 2021

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DENSO CORP (JP)

F02P13/00; F02B19/08; F02B19/12; F02B19/18; H01T13/20; H01T13/54

JP2014502692A	2014-02-03
US20190376441A1	2019-12-12

AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)

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