资源描述：
《汽车手动变速箱外文及其部分翻译》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、MANUALGEARBOXES9.1MANUALGEARBOXCLASSIFICATIONGearboxesarenormallyclassifiedaccordingtothenumberoftoothedwheelcouples(stages)involvedinthetransmissionofmotionatagivenspeed;inthecaseofmanualvehicletransmissions,thenumbertobetakenintoaccountisthatoftheforwardspeedsonly,with
2、outconsiderationofthefinalgear,evenifincludedinthegearbox.Thereforethereare:•Singlestagegearboxes•Dualstageorcountershaftgearboxes•MultistagegearboxesFigure9.1showsthethreeconfigurationsforafourspeedgearbox.Itisusefultocommentonthegenerallyadoptedrulesoftheseschemes.Eachw
3、heelisrepresentedbyasegmentwhoselengthisproportionaltothepitchdiameterofthegear;thesegmentisendedbyhorizontalstrokes,representingthetoothwidth.Ifthesegmentisinterruptedwherecrossingtheshaft,thegearwheelisidle;theoppositeoccursifthesegmentcrossesthelineoftheshaftwithouti
4、nterruption.Thenthewheelrotateswiththeshaft.Hubsarerepresentedaccordingtothesamerules,whilesleevesarerepresentedwithapairofhorizontalstrokes.Arrowsshowtheinputandoutputshafts.Singlestagegearboxesareprimarilyappliedtofrontwheeldrivenvehicles,becauseintheseitisusefulthatt
5、heinputandtheoutputshaftareoffset;inG.GentaandL.Morello,TheAutomotiveChassis,Volume1:ComponentsDesign,425MechanicalEngineeringSeries,cSpringerScience+BusinessMediaB.V.20094269.MANUALGEARBOXESFIGURE9.1.Schemesforafourspeedgearboxshowninthreedifferentconfigurations:a:single
6、stage,b:doublestageandc:triplestage.conventionalvehicles,ontheotherhand,itisbetterthatinputandoutputshaftsarealigned.Thisiswhyrearwheeldrivenvehiclesusuallyadoptadoublestagegearbox.Themulti-stageconfigurationissometimeadoptedonfrontwheeldrivenvehicleswithtransversalengin
7、e,becausethetransversallengthofthegearboxcanbeshortened;itisusedwhenthenumberofspeedsorthewidthofthegearsdonotallowasinglestagetransmissiontobeused.Itshouldbenotedthatonafrontwheeldrivenvehiclewithtransversalengine,havingdecidedonthevalueofthefronttrackandthesizeoftheti
8、re,thelengthofthegearboxhasadirectimpactonthemaximumsteeringangleofthewheelandthereforeontheminimumturningradi
