(7)THE COOLING SYSTEM

• • • • • • •
water jacket 水套 water pump水泵 radiator cap散热器盖 cylinder block 气缸体 radiator core散热器片 V-belt V型带 exhaust pipe 排气管
三、课文分析
radiator
radiator fan
water tank
coolant coolant pipe water pump
• The purpose of the cooling system is to keep the engine at its most efficient operating temperature under all driving conditions. • 冷却系的功用是在不同工况下，保证发动
四、课堂练习 radiator
thermostat
water temperature gauge
shutter water pump
radiator fan crankshaft coolant temperature sensor
五、知识反馈
• 1、单词抄写2遍； • 2、课后练习
THE COOLINGction.
• electronic fuel injectoion • sub-system. • air cleaner • fuel pressure regulator
• throttle position sensor
• pulse width
发到空气中。
• It’s usually mounted on an extension of the water pump shaft and is driven by a V-belt from a pulley mounted on the front end of the crankshaft. • 冷却风扇安装在水泵轴上，由安装在曲轴 前端的皮带轮通过V形带驱动。
机在最适宜的温度下工作。
• If no cooling system were provided, some parts would melt from the heat of the burning fuel, such as piston would expand so much
that they would seize and could not move in
• 水泵使冷却水在冷却系中循环流动。
• The radiator is a device designed to dissipate the heat which has been absorbed by the coolant from the engine.
• 散热器将冷却液从发动机吸收来的热量散
• • • • • • •
air flow meter air intake chamber intake manifold runner fuel tank fuel pump fuel return pipe fuel filter
二、词汇讲解
• • • • • • • •
melt .熔化，熔化 seize 卡住，擦伤 coolant .冷却剂，冷却液 thermostat .节温器 radiator .散热器 hose .软管 centrifugal 离心的，离心力的 impeller .叶轮，叶片
the cylinders.
• 如果没有冷却系，发动机运动部件会受热
导致卡死，如活塞会受热膨胀而不能在气 缸里运动。
• The pressurized cooling system of a watercooled engine consists of the engine water
jacket, thermostat, water pump, radiator, fan,
fan drive belt and necessary hoses.
• 水冷发动机的强制冷却系统包括发动机水
套、节温器、水泵、散热器、风扇、风扇 皮带以及必要的水管。
• Water pump forces the cooling water to
circulate through the cooling system.
• • • • • • • •
dissipate .消失，消散 pulley 滑轮，皮带轮 underestimate .过分低估 sufficient .足够的，充足的 cooling system 冷却系 operating temperature 工作温度 driving condition 行驶工况 water-cooled engine 水冷发动机