汽车专业英语 Main Components of Engine市公开课一等奖省名师优质课赛课一等奖课件

Unit2-1

MainComponentsofEngine

ContentsⅠ．Pre-questionsII.Text

ExplanationIII.ExercisesPre-questionsTheheartofautomobileWhatimpressionoftheengine?complicatedpowerPre-questionsWhataretheretypesoftheengine?electricmotors,steamengines,andinternalcombustionenginesWhat’stheinternalcombustionengine?

burnsfuelwithinthecylindersandconvertstheexpandingforceofthecombustionintorotaryforceusedtopropelthevehicle.Pre-questionsSingle-cylinderenginecylinderpistonPistonpinConnectingrodcrankshaftOilpipeIntakevalveExhaustvalveTiminggearOilpumpwhatisthepowersourceofautomobileandhowtoproduce?pistonpistonpinconnectingrodcrankshaftEnginePowerisproducedbythelinearmotionofapistoninacylinder.

Theconnectingrodtransmitstheup-and-downmotionofthepistontothecrankshaft,whichchangesitintorotarymotion.

Pre-questionsTheenginecomprisestwomechanismandfivesystems,whatarethey?crankshaftandconnectingrodmechanism,valvegear,coolingsystem,lubricatingsystem,fuelsystem,startingsystem,ignitionsystemPre-questionsconnectingrodflywheelcrankshaftpistonintakevalveexhaustvalvepushrodtappettiminggears■

Valvegear

■

Connectingrod

EnginecoolingsystemEnginelubricatingsystemFuelsupplysystemValvegearWhat’sthefunctionofthecrankshaftandconnectingrodmechanism?

Itsfunctionistoconvertheatenergyintomechanicalenergyusedtodrivethevehicles.

Pre-questionsTheinternalcombustionengine,asitsnameindicates,burnsfuelwithinthecylindersandconvertstheexpandingforceofthecombustionintorotaryforceusedtopropelthevehicle.译文：内燃机，顾名思义，就是燃料在气缸内部燃烧，而且把燃烧时膨胀力转化为驱动车辆旋转力。II.TextExplanationOfallautomobilecomponents,plicated[kmplikeitid]adj.复杂,难解dominance[dmnns]n.优势,统治译文：汽车发动机是一切汽车部件中结构最复杂，对汽车功效起支配作用一个总成。II.TextExplanationItsfunctionistoconvertheatenergyintomechanicalenergyusedtodrivethevehicles.Convert……into…..

转变；变换译文：它作用就是将热能转换成机械能用来驱动汽车。II.TextExplanationConvert…..into….①转变；变换Thatbuildinghasbeenconvertedintoaschool.那座楼房改成学校了。②兑换IwanttoconvertsomeHongKongdollarsintoAmericandollars.我想把一些港元换成美元。③改变信仰、党派或意见等Shemanagedtoconverthimtoheropinion.她终于设法说服了他接收她意见。II.TextExplanationPowerisproducedbythelinearmotionofapistoninacylinder.

linear[

lini]adj.线,直线,线性piston[pistn]

n.活塞II.TextExplanationThepistonattachedtothetopofaconnectingrodbyapin,calledapistonpinorwristpin.

attachtov.连接connectingrod连杆pistonpin=wristpin活塞销II.TextExplanationTheconnectingrodtransmitstheup-and-downmotionofthepistontothecrankshaft,whichchangesitintorotarymotion.transmit…to…把…传到…whichchangesitintorotarymotion定语从句II.TextExplanationdieselengineswaterpumptheignitiondistributoroilpantiminggearcrankshaftandconnectingrodmechanismvalvegearfuelsystemexhaustpipeexhaustmanifoldIII.ExercisesTranslatethefollowingexpressionsintoChinese.柴油发动机水泵分电器油底壳正时齿轮曲柄连杆机构配气机构燃油系统排气管排气歧管1-cylinderheadcover2-piston3-timingtoothedbelt4-waterpump5-oilpan6-oilpump7-crankshaft8-flywheel9-distributor10-valveIII.ExercisesThecrankshaftrepresentsthefinallink

intheconversionofreciprocatingmotionatthepistontooneofrotationattheflywheel.Inthecastofthemulti-cylinder

engine,thecrankshafthastocontrol

therelativemotionsofthepistons,whilereceivingtheirownimpulses.Aone-piececonstructionismostcommonly

usedforthemotor-vehiclecrankshaft,whichextendsthewholelengthoftheengineandmustthereforepossessconsiderablerigidity.III.ExercisesThetiming-drivefortheenginevalvemechanismistakenfromthefrontendofthecrankshaft

asisthepulleyandbeltdrivefortheengineauxiliaries,suchasthecoolingfanandthealternatorforelectricalsystem.attachedtotherearendofthecrankshaftistheengineflywheel.III.ExercisesI.TranslatethefollowingsentencesintoChinese.1．Engineisthepowersourceoftheautomobile.Powerisproducedbythelinearmotionofapistoninacylinder.发动机是汽车动力源.它经过汽缸内活塞线性运动产生.2．Thefuelsystemworksaccordingtotherequirementsoftheengineasitprovidesanair-fuelmixturewhichmustbeinproportiontothespeedandloadplacedontheengine.燃油系统作用是依据发动机转速和负荷提供一定百分比可燃混合气以满足发动机需求。III.Exercises3．Thevalvegearprovidestimelyadmissionofthefreshchargeintothecylindersandexhaustofspentgasesfromthem.配气机构机构可定时将新鲜气体充入气缸，而且将废气排放出去。III.Exercises1．发动机主要有两大机构五大系统组成。Anengineismainlycomposedoftwomechanismsandfivesystems.2．曲柄连杆机构主要包含机体组，活塞连杆组和曲轴飞轮组。Thecrankshaftandconnectingrodmechanism

mainlyconsistsoftheenginecrankcaseandcylinderblock,thepistonandconnectingrod,thecrankshaftandflywheel.

III.ExercisesII.TranslatethefollowingsentencesintoEnglish.3．水泵工作时，能够将冷却液在发动机水套中和散热器之间往返流动。Whe