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发明授权
CN106356717B 火花塞 有权

火花塞
摘要：
一种火花塞，提高绝缘体相对于破裂的耐性。具备：绝缘体；中心电极；端子配件，具备主体部和位于比主体部靠后端侧的头部；及导电性的密封件，与端子配件的前端接触，绝缘体具备圆筒状的第一部、第二部及第三部，端子配件的主体部的前端配置于具有第一内径的第一部，第二部包含从绝缘体的后端向前端侧离开1mm以上的部分，具有比第一内径大的第二内径，第三部位于第一部和第二部之间，具有比第一内径大且比第二内径小的第三内径。主体部具备圆筒状的前端主体部和圆筒状的后端主体部，前端主体部包含主体部的前端，后端主体部位于比前端主体部靠后端侧处，具有比前端主体部的外径大的外径。第三部的后端位于比后端主体部的前端靠后端侧处。
摘要（英）：

A spark plug with an insulator (10) that includes: a first portion (10A) having a first inner diameter (Ra) with a front end of a trunk portion (43) of a metal terminal (40) disposed therein; a second portion (10B) having a second inner diameter (Rb) larger than the first inner diameter (Ra), and including a portion 1 mm or more forward of a rear end of the insulator (10); and a third portion (10C) disposed between the first portion (10A) and the second portion (10B) and having a third inner diameter (Rc) larger than the first inner diameter (Ra) and smaller than the second inner diameter (Rb). The trunk portion (43) of the metal terminal (40) includes: a front trunk portion (43A) and a rear trunk portion (43C) with a front end of the rear trunk portion (43C) positioned forward of a rear end of the third portion (10C) of the insulator (10), the rear trunk portion (43C) having an outer diameter (Re) larger than the outer diameter (Rd) of the front trunk portion (43A).

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