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火花塞的结构特点 火花塞的作用是将高压导线传来的高压跳过其间隙,产生强烈的火花,把燃烧室内的可燃混合气点燃。火花塞在发动机上的工作条件是非常恶劣的。绝缘体除承受4～7帕的压力冲击外,还要承受2000℃～3000℃的高温。但在进入新的可燃混合气时,温度却只有60℃～80C。露在气缸外部的绝缘体,在冬季又要处于零度以下的空气中,因而使绝缘体内部产生较大的应力。绝缘体还应有好的绝缘性能,在经受15～20千伏高压时不能被击
The structure of the spark plug The role of the spark plug is the high voltage wire from the high pressure to skip its gap, resulting in a strong spark, burning the combustible mixture in the combustion chamber. Spark plug on the engine working conditions are very bad. Insulators in addition to withstand the pressure of 4 to 7 Pa impact, but also to withstand 2000 ℃ ~ 3000 ℃ high temperature. However, when entering the new combustible mixture, the temperature is only 60 ℃ ~ 80C. Insulators exposed outside the cylinder, but also in the winter and below zero in the air, so that the insulator produces greater stress. Insulators should also have good insulation properties, withstand 15-20 kV high pressure can not be hit