1-Unit 3精品
14页1、Unit 3 Engine Cooling and Lubrication System,1. Engine Cooling System The cooling system is used to keep the engine at the most efficient operating temperature. The cooling system is composed of the water jacket (inside the cylinder block and cylinder head), radiator, water pump, thermostat, fan, hoses and other components. Fig 1-3-1 shows the parts of a cooling system.,efficient 效率高的 water jacket 水套 radiator 散热器,水箱 water pump 水泵 thermostat 节温器 hose 软管,Cooling System(冷却系统),Fig. 1-3-1 1-radiator(
2、散热器) 2-securing clip(固定夹)3-securing rubber (固定橡胶) 4 - upper coolant hose (上部冷却液软管) 5-rubber washer(橡胶垫) 6-radiator fan(冷 却风扇)7- fan ring(风扇罩壳)8- locking bolt(紧固螺栓)9-nut(螺 母)10-2 pin connector(双头插式插 头)11-lower coolant hose(下部冷却 液软管)12-O ring(O型圈)13- connector(连接插头)14-radiator fan thermo switch(散热风扇的热敏开 关)15- seal(密封圈) 16 drain screw(排水螺栓),(1) Radiator and Fan The radiator performs the function of cooling the coolant which has passed through the water jacket and become hot, and it is mounted in th
3、e front of the vehicle. A fan is mounted behind the radiator to assist the flow of air through the radiator. The fan operates when the engine coolant temperature becomes high in order to prevent it from becoming too high. (2) Radiator Cap A relief valve ( pressurization valve ) and a vacuum valve ( negative pressure valve ) are built into the radiator cap. It is used to maintain the correct and constant pressure on the cooling system. (3) Water jacket The water jacket is the open spaces within t
4、he cylinder block and cylinder head through which coolant passes.,perform 执行 assist 帮助 relief valve 泄压阀 pressurization 维持大气压水平 vacuum valve 真空阀 negative pressure 负压,(4) Water Pump The water pump is used to circulate the coolant through the cooling system. It is mounted on the front of the cylinder block and driven by a timing belt. (5)Thermostat The thermostat is one of the most important parts of the cooling system, and used to keep the engine coolant at the most efficient temperature. If the c
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