資源描述：
《英文材料及翻譯》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在工程資料-天天文庫。
1、U-SeriesTransaxlesTransaxleOverviewTheU-Seriesautomatictransaxlesarecompact,lightweight,electronicallycontrolled,fourspeedtransmissionsintroducedinmodelyear2000.Thecounterdrivegearassemblyislocatedinfrontoftheplanetarygearsetsratherthanbehindthemasintheearlie
2、rtransaxlemodelswhichcontributetothecompactjightweightdesign.Thetransmission'splanetarygeardesignisauniquedeparturefromthefamiliarSimpsonplanetarygeardesignusedinallpreviousToyotatransmissions.TheSimpsonplanetarygeardesignusestwoplanetarygearsetswithacommonsi
3、nglesungearforfirst,second,thirdandreversegears.TheU-seriesdepartsfromthisdesignwithtwoplanetarygearsetswithseparatesungears.Traditionalhydraulicautomatictransmissioncanchangegearautomatically,dependingondifferentspeedsandthrottleposition.Thewayitchangegearis
4、mechanicallychangespeedandthrottlepositionsignalintopilotoilpressure,thensendittothetwosidesofshiftvalve,soitcanchangethecircuitsofthecomponents(clutchandbrake)ofshift?Inthisway,theoilcomeintothecertaincomponents,makesclutchcombinedofseparated,brakebrakedofre
5、leased,planetarytransmissionupgradedordegraded,soitcanchangespeedautomatically.Electricalhydraulicautomatictransmissionismadebasedonhydraulicautomatictransmission,addingelectricalcontrolsystem.Itcanacceptthedriver'sorderbysensorsandswitches,monitoringthecaran
6、dengine'scondition,thenchangetheinformationintosignalsandtransportthemtoECU.ThenECUcontrolsshiftvalvesofhydraulicdevicesbyelectromagneticallyoperatedvalve,makesthecircuitofclutchesandbrakesopenedorblocked,socontrolsthetimeofshiftandtheshiftitself,somakeitchan
7、gespeed.Useriesautomatictransmissionhassimplestructure,lightweight,electricalcontrol,fourshifts.Themodelofitisbuiltin2000,comparedwithformertransmission,intermediateaxleisdifferent.Newtransmission^intermediateaxleisputinfrontoftheplanetarygeartrain,soitcanach
8、ievethedesignofmoresimpleandlight.ThedesignofthetransmissionsystemisdifferentfromJapanesecars,whichisusingtheSimpson^.TheSimpson^isusingtwoplanetgeartrainwithonesungeartoachievethecontrol
