| 摘要 |
<p>A spark plug (20), comprising an insulator (24), a center electrode (21), a casing (26), a guide portion (28), and a grounding electrode (22); the insulator (24) has a shaft hole extending axially; the center electrode (21) is inserted through the axle hole of the insulator (24), and exposes the end of the center electrode; the casing (26) is a hollow cylinder, and is sleeved on the surface of the insulator (24); the guide portion (28) is disposed at an opening end of the casing (26) facing the cylinder of an internal combustion engine, the guide portion being a cylindrical body, and having a sparking hole (282) in the center thereof passing through upper and lower bottom surfaces; a guide groove (283) is disposed radially in the side wall of the guide portion, the guide groove (283) communicating with the sparking hole (282); the grounding electrode (22) is disposed on the inner wall of the casing (26), or on the inner wall of the sparking hole (282) of the guide portion (28), and an ignition end having a spark discharge gap is formed between the grounding electrode and the end of the center electrode (21).</p> |
