【精品】内燃机专业英语英文.doc

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1、内燃机专业英语自编讲义部分：1.EngineClassificationandOverallMechanicsTheautomobileenginescanbeclassifiedaccordingto:1.numberofcylinders;2.arrangementofcylinders;3.arrangementofvalves;4.typeofcooling;5.numberofcycles(twoorfour)；6.typeoffuelburned;7.typeofignition.Theengineisthesourceofpowerthatmakes

2、thewheelsgoaroundandthecarmove.Theautomobileengineisaninternal-combustionenginebecausethefuel(gasoline)isburnedinsideit.Theburningofgasolineinsidetheengineproduceshighpressureintheenginecombustionchamber.Thishighpressureforcespistontomove,themovementiscarriedbyconnectingrodstotheengin

3、ecrankshaft・Thecrankshaftisthusmadetorotate;therotarymotioniscarriedthroughthepowertraintothecarwheelssothattheyrotateandthemoves.Theenginerequiresafuelsystemtosupplyitwithamixtureofairandfuel.Thefuelsystemdoesthisbypumpingliquidgasolinefromatankintothecarburetor,amixingdevicethatmixe

4、sthegasolinewithair.Themixtureisdeliveredtotheenginewhereitisburned.Theenginealsoneedsacoolingsystem,thecombustionoftheair-fuelmixtureintheenginecreatesaveryhightemperature(ashighas2000to2700°C).Thecoolingsystemtakesheatawayfromtheenginebycirculatingaliquidcoolant(watermixedwithantifr

5、eeze)betweentheengineandaradiator.Thecoolantgetshotasitgoesthroughtheengine.Itcoolsoffasitgoesthroughtheradiator.Thus,thecoolantcontinuallytakesheatawayfromtheengine,whereitcoulddodamage,anddeliversittotheradiator.Airpassingthroughtheradiatortakesheatawayfromtheradiator.Theenginealsoi

6、ncludesalubricatingsystem.Thepurposeofthelubricatingsystemistosupplyallmovingpartsinsidetheenginewithlubricatingoil;theoilkeepsmovingpartsfromwearingexcessively.Theenginerequiresafourthsystem,theignitionsystem・Theignitionsystemprovideshigh-voltageelectricsparksthatignite,orsetfireto,t

7、hechargesofair-fuelmixtureintheenginecombustionchambers.Thefifthisstartingsystemanditspurposeistochangetheelectricalcurrentintothemechanicalenergytopushthecrank-shaftaround.Bymeansofthis,theenginecanbestarted・Thesefivesystemsarediscussedbrieflyinfollowingsections.WordsandExpressionsco

8、mbust