汽车专业英语PPT课件-section 1 Chapter 3.5 .ppt

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1、Chapter3PowerTrainPowerTrain3.1Clutches3.2ManualTransmission3.3PropellerShaftsandUniversalJoints3.4FinalDrive,DifferentialandAxleShaft3.5Automaticgearboxes本章讲授内容NewWordsinterrupt[,intə'rʌpt]中断，切断semiautomatic['semi,ɔ:tə'mætik]a.半自动的pneumatic[nju:'mætik]a.气体的，充气的，气动的diagonally[dai

2、'ægənəli]ad.对角地，斜对地lockup['lɔkʌp]n.锁，锁住，锁止paddle['pædl]n.桨，桨状物Chapter6Powertrain3.5AutomaticgearboxDifferenttypesofautomaticgearboxesareused:semiautomaticandfullyautomatic.Semiautomaticgearboxes.Thepowerflowisinterruptedbyautomaticclutchdisengagementandcutinbyclutchengagement,e.g.

3、automaticclutchsystem(ACS).Shiftingofgearstochangethegearratiosanddirectionofrotationisperformedmanuallybyoperatingashiftlever.Fullyautomaticgearboxes.Thepowerflowisautomaticallyinterruptedorcutinasrequired.Shiftingofgearstochangethegearratiosisperformedautomaticallybyelectro-hydr

4、aulicorelectro-pneumaticcontrol.Automatedmanualtransmission,ConvertertransmissionandCVTarefullyautomaticgearboxes.ThefeaturesofthegearboxesarelistedintheTable3-1.Chapter6Powertrain3.5AutomaticgearboxTable3-1featuresofthefullyautomaticgearboxesConventionalautomatictransmission(AT)C

5、ontinuouslyvariabletransmission(CVT)Automatedmanualtransmission(AMT)Direct-shifttransmission(DSG)·Hydrodynamictorqueconverter·Planetarygearset·Thegear-ratiochangeisstepped.·PrimaryandsecondaryV-pulleys·Steelbeltorchain·Thegear-ratiochangeiscontinuouslyvariable.·Diaphragm-springdry

6、clutch·Spurgears·Thegear-ratiochangeisstepped.·dualmulti-platewetclutches·Spurgears·Thegear-ratiochangeisstepped.3.5.1Steppedautomatictransmissionwithhydrodynamicconverter(AT)-ConventionalautomatictransmissionTorqueconverter(Fig.3-10)servesasastartingclutchtofacilitatessmoothandco

7、mfortabledrawingaway,transmitsandmultipliestheenginetorque,anddampsenginetorsionalvibrations.gearsystemsareusedtomultiplytorques,reducespeedsandreversesthedirectionofrotationforthereversegear.Mostautomaticsusetheplanetarygearsets(Fig.3-11).ThecommonlyusedplanetarygearsareRavigneau

8、xsetandSimpsonset.Asimpleplanetar