发动机冷却系统外文翻译
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1、无锡职业技术学院 毕业设计说明书 ( 论文 ) 1 英文翻译: 原文: The Cooling System The engine cooling system actually is a temperature regulation system to protect engine from self-destruction. About one-third of the heat produced in the engine is converted into power, another third goes out through the exhaust pipe un-used, a
2、nd the remaining third must be carried away by the cooling system (Some is utilized for heating the passenger compartment). To keep the engine temperature in balance is quite essential for an engine to produce power. If the engine runs too hot, it may suffer from pre-ignition since the air-fuel char
3、ge is ignited prematurely from excessive combustion chamber temperature. The viscosity of the oil is reduced. Hot oil also forms varnish and carbon deposits may be drawn into the combustion chamber where it may increase HC emissions. The behavior of the metals at excessively high tem perature also d
4、iffers from that at normal temperature. Those cause poor performance and premature wear, and may even result in engine damage. If the engine runs too cold, the fuel will not vaporize properly. If the liquid fuel reaches the cylinders, it will reduce lubrication by washing the oil from the cylinder w
5、alls and diluting the engine oil. That causes a loss of performance, an increase in HC emissions, and premature wear. For these reasons, a cooling system of some kind is necessary in any internal combustion engine. There are two types of cooling systems found on motor vehicles: liquid cooled and air
6、 cooled .Air cooled engines are found on a few older cars, like the original Volkswagen Beetle, the Chevrolet Corsair and a few others. Many modern motorcycles still use air cooling, but for the most part, automobiles and trucks use liquid cooled systems and that is what this article will concentrat
7、e on. Components of a liquid cooling system include the radiator, radiator cooling fans and fan drive belt, pressure cap & reserve tank, water pump, thermostat, bypass system, freeze plugs, head gaskets & intake manifold gaskets, heater core and hoses. In detail, the cooling system is made up of the
8、 passages ( water jacket) inside the engine block and heads, a water pump to circulate the coolant, a thermostat to control the temperature of the coolant, a radiator to cool the coolant, a radiator cap to control the pressure in the system, and some plumbing consisting of interconnecting hoses to t
9、ransfer the coolant from the engine to radiator and also to the cars heater system 无锡职业技术学院 毕业设计说明书 ( 论文 ) 2 where hot coolant is used to warm up the vehicles interior on a cold day. A liquid cooling system works by sending a liquid coolant through passages in the engine block and heads. As the cool
10、ant (low freezing liquid called antifreeze) flows through these passages, it picks up heat from the engine. The heated fluid then makes its way through a rubber hose to the radiator in the front of the car. As it flows through the thin tubes in the radiator, the hot liquid is cooled by the air strea
11、m entering the engine compartment from the grill in front of the car. Once the fluid is cooled, it returns to the engine to absorb more heat. The water pump has the job of keeping the fluid moving through this system of plumbing and hidden passages. A thermostat is placed between the engine and the
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