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专利文献简介序号：３５１；公开号：ＣＮ１１０７２６３Ａ新型火花塞及其涂层加工方法：本发明涉及一种用于汽油发动机上的点火装置。本发明所公开的新型火花塞是在铁壳体以下的绝缘瓷管外表面设制至少一个凹槽，在凹槽内用粉末烧结或喷涂的方法涂一层导电金属环，形成点...
Patent Literature Brief introduction Serial number: 351; Publication number: CN1107263A Novel spark plug and its coating processing method: The present invention relates to a gasoline engine ignition device. The new spark plug disclosed in the invention is characterized in that at least one groove is formed on the outer surface of the insulating porcelain tube below the iron shell, and a conductive metal ring is coated by powder sintering or spraying in the groove to form a dot ...