火花塞类型结构（Spark plug type structure）.docVIP

火花塞类型结构（Spark plug type structure） Since 1860 the French Lou Ny M invented the worlds first spark plug, spark plug in various aspects of the structure, appearance, material and technology have undergone tremendous changes, but the working principle of electric engine combustion chamber consistent from beginning to end, the input is high voltage ignition coil, gap between breakdown electric spark, causing combustion gas mixture. Today, the spark plug Market brand, a variety of models, firing end of different shapes, but there is no big difference in its basic structure. Just because of the material, process and performance requirements of different manufacturers with different structural design, therefore, based on the traditional structure and derive a variety of forms, so the market appeared the spark plug of every hue. The basic structure of spark plug The main parts of the spark plug are insulator, shell, connecting screw and electrode. Insulators must have good insulation and thermal conductivity, high mechanical strength, and withstand high temperature thermal shock and chemical corrosion. The material is usually 95% alumina ceramic. The shell is made of steel, and the function is to fix the spark plug on the cylinder head. The dimension of the six angle thread of the shell has been incorporated into the ISO international standard. The spark plug electrode comprises a center electrode and a side electrode, wherein the spark gap is arranged between them. The size of the gap directly affects the engines starting, power, working stability and economy. The reasonable clearance is related to the ignition voltage. The electrode material must have good resistance to electrical erosion (spark erosion) and corrosion (chemical - thermal corrosion), and should have good thermal conductivity. Between the center electrode and the connecting screw rod is the conductor glass sealant, must not only be able to conduct electricity, but also can withstand the high pressure which