SPARK PLUG
An object is to simultaneously realize reduction of capacitance and securing of the impact resistance of a center electrode. A spark plug includes a metallic shell, an insulator, a resistor, a center electrode, and a seal. The metallic shell is an approximately tubular member having a ground electro...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | An object is to simultaneously realize reduction of capacitance and securing of the impact resistance of a center electrode. A spark plug includes a metallic shell, an insulator, a resistor, a center electrode, and a seal. The metallic shell is an approximately tubular member having a ground electrode at its forward end. The insulator is a tubular member which is held inside the metallic shell and has an axial hole formed therein. The axial hole has a small diameter portion, an intermediate diameter portion having a diameter larger than that of the small diameter portion and connected to a rear end of the small diameter portion via a step portion, and a large diameter portion having a diameter larger than that of the intermediate diameter portion and disposed on the rear side of the intermediate diameter portion. The resistor is at least partially disposed inside the large diameter portion. The center electrode has a flange portion which bulges in a radial direction inside the intermediate diameter portion and comes into contact with the step portion, and a leg portion which extends forward from the flange portion and is disposed inside the small diameter portion. The seal is a member which is disposed on the rear side of the step portion and electrically connects the center electrode and the resistor. The rear end of the seal is located inside the intermediate diameter portion. |
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