| 摘要 |
The present invention relates to a spark plug of an internal combustion engine. The spark plug of an internal combustion engine of the present invention comprises: a housing with a screw of a predetermined length formed on the outer-lower side of the housing; an insulator mounted in a hollow of the housing, while insulating and covering a terminal stick buried at the center of the housing; a central electrode extending from the lower end of the terminal stick and exposed outside the insulator; a ground electrode formed at the lower-inner side of the housing as a counterpart of the central electrode; a primary combustion chamber forming cell, which has an internal screw arranged on the inside of the opening while making a screw joint with the screw on the inside of the opening, an external screw arranged on the outer peripheral surface to fasten the combustion chamber, and at least one ejection opening formed in the lower end; a primary combustion chamber, which is defined between the housing and the primary combustion chamber forming cell to accommodate the central and ground electrodes and has varying volume that is controlled by the length of the screw-joint between the housing and the primary combustion chamber forming cell, wherein the ejection openings are comprised of a main ejection opening formed at the center of the lower end of the primary combustion chamber forming cell, and at least two sub-ejection openings formed along the circumferential direction around the main ejection opening, with the sub-ejection openings being tilted in the side direction to form a swirling flame coming out of the primary combustion chamber. |
