汽车专业英语(幻灯片)chapter 5 at(3.3.2-5)

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1、3.3.4AutomaticTransmission(AT)Review1:ListthepartsofAutomaticTransmission(AT).1）Automatictransmissions(AT)Automatictransmissionshavethreebasicsystems---atorqueconverter,agearsystem,andahydraulicsystem.Thesefittogetherinaunitthatfastensdirectlybehindtheen

2、gine.[Fig.3-9].Thefrontsectionofthetransmissionhousesthetorqueconverter.Thetorqueconverterisliketheclutchinamanualtransmission.Itisthecouplingbetweentheengineanddrivetrainthattransmitspowertothedrivewheels.自动变速器由液力变矩器、齿轮机构和液压控制系统等三个基本系统组成，它们组合在一起，直接安装在发动

3、机后（图3-9）。液力变矩器位于变速器的前端，它类似于手动变速器里的离合器，布置在发动机和传动系之间，向驱动轮传递动力。Review2:What’sthetheoryofhydrodynamiccoupling?PartsofTorqueConverterReview3:ListthepartsofPlanetaryGearsystem.RinggearPlanetarygearPlanetcarrierSungear2）planetarygears:Theplanetgearsareactuallyo

4、nesetofgearsjoinedtogetherbyacagecalledtheplanetgearcarrierorplanetpinioncarrier.Thecarrierhaspinsthatgothroughthecenterofeachoftheplanetgears.Thus,alltheplanetgearsmovetogetherwhentheplanetcarriermoves.Eachplanetgearcanturnarounditspinwhentheplanetgearc

5、arrierisstationary.行星齿轮机构是一组齿轮，由行星架将这些齿轮组合在一起。行星架上有销穿过每个行星轮的中心。当行星架运动时，所有的行星轮也随之运动。当行星架固定时，行星轮绕销转动。Review4:HowthePlanetaryGearsystemworks?3）howtheplanetarysystemwork:Theplanetarysystemworksonthefollowingprinciples:Withonepartheldstationary,torqueandpower

6、canbeappliedtoasecondmembertomakeathirdmemberrotate.Inotherwords,withoneofthethreemembersheldstationary,torqueisappliedtoeitheroftheothertwomembersandoutputtorqueisdeliveredfromthethirdmember.行星齿轮系的工作原理如下：当一个部件固定时，扭矩和动力会施加给第二个部件，从而带动第三个部件旋转。也就是说，在三个部件中只要

7、使一个部件固定，扭矩会传递给其它两部件的任何一个部件，动力就会从第三个部件输出。4）ringgearstationary(gearreduction):Whenyouholdtheringgearandapplytorquetothesungear,theplanetcarrierturnsinthesamedirectionasthesungear.However,thecarrierturnsatamuchslowerspeed.AsFig.3-7shows,thecarriermakeslesst

8、hanhalfarevolutioninthetimethesungearmakesacompleterevolution.Iftheplanetcarrierwereconnectedtoanoutputshaft,thatshaftwouldalsoturnslowerthantheinputshaftconnectedtothesungear.Thiscausesgearreductionontheoutputshaft.Ofcour