大学毕业论文---三轴式五挡手动变速器设计.doc

Ⅱ摘要变速器用来改变发动机传到驱动轮上的转矩和转速，目的是在原地起步，爬坡，转弯，加速等各种行驶工况下，使汽车获得不同的牵引力和速度，同时使发动机在最有利工况范围内工作。变速器设有空挡和倒挡。需要时变速器还有动力输出功能。因为变速箱在低档工作时作用有较大的力，所以一般变速箱的低档都布置靠近轴的后支承处，然后按照从低档到高档顺序布置各档位齿轮。这样做既能使轴有足够大的刚性，又能保证装配容易。变速箱整体结构刚性与轴和壳体的结构有关系。一般通过控制轴的长度即控制档数，来保证变速箱有足够的刚性。本文设计研究了三轴式五挡手动变速器，对变速器的工作原理做了阐述，变速器的各挡齿轮和轴做了详细的设计计算，并进行了强度校核，对一些标准件进行了选型。变速器的传动方案设计。简单讲述了变速器中各部件材料的选择。关键字：挡数；传动比；齿数；轴AbstractTransmissiontochangetheenginereachedonthedrivingwheeltorqueandspeed,isaimedatmarkingstart,climbing,turning,acceleratevariousdrivingconditions,thecarwasdifferenttractionandspeedMeanwhileengineinthemostfavorableworkingconditionswithinthescopeofthework.Andthetransmissioninneutralgearwithreversegear.Transmissionalsoneedpoweroutputfunction.Gearboxbecauseofthelow-gradeworkatalargerrole,Ingeneral,thelow-gradegearboxlayoutareclosetotheaxisaftersupport,Followingfromlow-gradetohigh-gradeorderofthelayoutofstallsgear.Thiswillnotonlyallowaxisarelargeenoughforarigid,butalsoensureseasyassembly.Gearboxoverallstructureandrigidaxleandtheshellstructureofrelations.Generallythroughthecontrolshaftlengthcontroloverseveralstallstoensurethatadequategearboxrigid.Thispaperdescribesthedesignofthree-axisfiveblockmanualtransmission,thetransmissionprincipleofworkelaborated,Transmissionofthegearshaftanddoadetaileddesign,andtheintensityofaschool.Forsomestandardpartsfortheselection.TransmissionTransmissionprogramdesign.Abriefdescriptionofthetransmissionofallcomponentsofthematerialchoice.Keywords:block;Transmissionratio;Teeth;Axis目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc170451617"第1章绪论………………………………………………………..1HYPERLINK\l"_Toc170451618"第2章总体方案设计………………………………………………..3HYPERLINK\l"_Toc170451619"2.1汽车参数的选择………………………………………………...PAGEREF_Toc170451619\h3HYPERLINK\l"_Toc170451620"2.2变速器设计应满足的基本要求…………………………………..PAGEREF_Toc170451620\h3HYPERLINK\l"_Toc170451621"第3章变速器传动机构布置方案………………………………...….PAGEREF_Toc170451621\h4HYPERLINK\l"_Toc170451622"3.1传动机构布置方案分析……………………………………….…PAGEREF_Toc170451622\h4HYPERLINK\l"_Toc170451623"3.1.1固定轴