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发动机在运转过程中,可燃混合气在气缸内燃烧,气体温度可达1800℃～2000℃,燃料燃烧产生的总热量的三分之一要传给高温气体接触过的机件。如对这些机件不加冷却,就会把上述机件烧坏,产生严重后果。因此,发动机运转过程中必须加以冷却。但是冷却的程度要适当,否则对发动机的动力性和经济性会产生不良影响,同时还会加速发动机的零件磨损。同时,冷却温度也不能过低,实践证明,发动机在过冷状态下工作(40℃～50℃),其零件磨损比正常温度80℃～90℃下运转要大好几倍。所以冷却的目的是
During the operation of the engine, the combustible mixture is combusted in the cylinder, the temperature of the gas can reach 1800-2000 DEG C, and one third of the total heat generated by the combustion of the fuel is transmitted to the parts contacted by the hot gas. If these parts without cooling, it will burn the parts, resulting in serious consequences. Therefore, the engine must be cooled during operation. However, the degree of cooling should be appropriate, otherwise the engine power and economy will have a negative impact, but also will accelerate the wear and tear of the engine parts. At the same time, the cooling temperature can not be too low, the practice proved that the engine is working in a supercooled state (40 ℃ ~ 50 ℃), the parts wear than the normal temperature of 80 ℃ ~ 90 ℃ to operate several times larger. So the purpose of cooling is