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ID:49486109
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时间:2020-03-02
《【精品】内燃机专业英语英文.doc》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
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
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