资源描述：
《毕业论文外文翻译-汽车手动变速箱》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、MANUALGEARBOXES9.1MANUALGEARBOXCLASSIFICATIONGearboxesarenormallyclassifiedaccordingtothenumberoftoothedwheelcouples(stages)involvedinthetransmissionofmotionatagivenspeed;inthecaseofmanualvehicletransmissions,thenumbertobetakenintoaccountisthatoftheforwardspeedsonly,wi
2、thoutconsiderationofthefinalgear,evenifincludedinthegearbox.Thereforethereare:•Singlestagegearboxes•Dualstageorcountershaftgearboxes•MultistagegearboxesFigure9.1showsthethreeconfigurationsforafourspeedgearbox.Itisusefultocommentonthegenerallyadoptedrulesoftheseschemes.E
3、achwheelisrepresentedbyasegmentwhoselengthisproportionaltothepitchdiameterofthegear;thesegmentisendedbyhorizontalstrokes,representingthetoothwidth.Ifthesegmentisinterruptedwherecrossingtheshaft,thegearwheelisidle;theoppositeoccursifthesegmentcrossesthelineoftheshaftwi
4、thoutinterruption.Thenthewheelrotateswiththeshaft.Hubsarerepresentedaccordingtothesamerules,whilesleevesarerepresentedwithapairofhorizontalstrokes.Arrowsshowtheinputandoutputshafts.Singlestagegearboxesareprimarilyappliedtofrontwheeldrivenvehicles,becauseintheseitisuse
5、fulthattheinputandtheoutputshaftareoffset;inG.GentaandL.Morello,TheAutomotiveChassis,Volume1:ComponentsDesign,425MechanicalEngineeringSeries,cSpringerScience+BusinessMediaB.V.20094269.MANUALGEARBOXESFIGURE9.1.Schemesforafourspeedgearboxshowninthreedifferentconfiguration
6、s:a:singlestage,b:doublestageandc:triplestage.conventionalvehicles,ontheotherhand,itisbetterthatinputandoutputshaftsarealigned.Thisiswhyrearwheeldrivenvehiclesusuallyadoptadoublestagegearbox.Themulti-stageconfigurationissometimeadoptedonfrontwheeldrivenvehicleswithtran
7、sversalengine,becausethetransversallengthofthegearboxcanbeshortened;itisusedwhenthenumberofspeedsorthewidthofthegearsdonotallowasinglestagetransmissiontobeused.Itshouldbenotedthatonafrontwheeldrivenvehiclewithtransversalengine,havingdecidedonthevalueofthefronttrackand
8、thesizeofthetire,thelengthofthegearboxhasadirectimpactonthemaximumsteeringangleofthewheelandthereforeontheminimumturningradi
