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0引言拖拉机工作时,发动机内与高温燃气相接触的零件受到强烈加热,如不加以适当的冷却,会使内燃机过热,充气系数下降,燃烧不正常(爆燃、早燃等),机油变质或烧损,零件的摩擦和磨损加剧,引起内燃机的动力性、经济性、可靠性和耐久性全面恶化。但是,如果冷却过强,则柴油机工作粗爆,散热损失和摩擦损失增加,零件的磨损加剧,也会使内燃机工作变坏。因此,冷却系统的主要任务是保证发动机在最适宜的温度状态下工作。1拖拉机的工况及对冷却系统的要求一个良好的冷却系统,散热能力能满足拖拉机在各
0 Introduction When the tractor is working, the parts in the engine that come into contact with the hot gas are strongly heated. If not properly cooled, the internal combustion engine will overheat, the inflation coefficient will drop, the combustion will not be normal (deflagration, pre-ignition, etc.) Loss, parts of the friction and wear increased, causing the internal combustion engine power, economy, reliability and durability of the overall deterioration. However, if the cooling is too strong, then the diesel engine working rough explosion, heat loss and friction loss increases, the wear and tear of parts exacerbated, will make the internal combustion engine work worse. Therefore, the cooling system’s main task is to ensure that the engine at the most suitable temperature conditions. A tractor conditions and the requirements of the cooling system A good cooling system, cooling capacity to meet the tractor in each