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ID:6791036
大小:1.29 MB
页数:24页
时间:2018-01-25
《机械设计制造及其自动化专业毕业设计(论文)英文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2008届机械设计制造及其自动化专业外文翻译HowAutomaticTransmissionsWorkbyKarimNiceIntroductiontoHowAutomaticTransmissionsWorkIfyouhaveeverdrivenacarwithanautomatictransmission,thenyouknowthattherearetwobigdifferencesbetweenanautomatictransmissionandamanualtransmission:Thereisnoclutchpedalinanautomatictransmissioncar.T
2、hereisnogearshiftinanautomatictransmissioncar.Onceyouputthetransmissionintodrive,everythingelseisautomatic.Boththeautomatictransmission(plusitstorqueconverter)andamanualtransmission(withitsclutch)accomplishexactlythesamething,buttheydoitintotallydifferentways.Itturnsoutthatthewayanautomatictransmis
3、siondoesitisabsolutelyamazing!AutomaticTransmissionImageGallery242008届机械设计制造及其自动化专业外文翻译Inthisarticle,we'llworkourwaythroughanautomatictransmission.We'llstartwiththekeytothewholesystem:planetarygearsets.Thenwe'llseehowthetransmissionisputtogether,learnhowthecontrolsworkanddiscusssomeoftheintricacies
4、involvedincontrollingatransmission.Justlikethatofamanualtransmission,theautomatictransmission'sprimaryjobistoallowtheenginetooperateinitsnarrowrangeofspeedswhileprovidingawiderangeofoutputspeeds.PhotocourtesyDaimlerChryslerMercedes-BenzCLK,automatictransmission,cut-awaymodelWithoutatransmission,car
5、swouldbelimitedtoonegearratio,andthatratiowouldhavetobeselectedtoallowthecartotravelatthedesiredtopspeed.Ifyouwantedatopspeedof80mph,thenthegearratiowouldbesimilartothirdgearinmostmanualtransmissioncars.You'veprobablynevertrieddrivingamanualtransmissioncarusingonlythirdgear.Ifyoudid,you'dquicklyfin
6、doutthatyouhadalmostnoaccelerationwhenstartingout,andathighspeeds,theenginewouldbescreamingalongnearthered-line.Acarlikethiswouldwearoutveryquicklyandwouldbenearlyundriveable.Sothetransmissionusesgearstomakemoreeffectiveuseoftheengine'storque,andtokeeptheengineoperatingatanappropriatespeed.242008届机
7、械设计制造及其自动化专业外文翻译Thekeydifferencebetweenamanualandanautomatictransmissionisthatthemanualtransmissionlocksandunlocksdifferentsetsofgearstotheoutputshafttoachievethevariousgearratios,whileinanautomatictransmis
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