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题目：北京牌BJ6700DK轻型客车变速器设计姓名：班级学号：指导教师：姚嘉摘要佳木斯大学教务处-I-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。关键词挡数；传动比；齿数；轴Abstract佳木斯大学教务处-II-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.Keywordsblock；Transmission；ratio；Teeth；Axis.目录佳木斯大学教务处-1-目录摘要....................................................................................................................................IAbstract................................................................................................................................II第1章机械式变速器的概述及其方案的确定..................................................................21.1变速器的功用和要求..................................................................................................21.2变速器结构方案的确定..............................................................................................21.2.1变速器传动机构的结构分析与型式选择................................................................................21.2.2选择倒档传动方案....................................................................................................................61.3变速器主要零件结构的方案分析..............................................................................71.3.1齿轮型式....................................................................................................................................71.3.2换挡结构型式............................................................................................................................71.3.3变速器轴承..............................................................................................................................10第2章变速器主要参数的选择与主要零件的设计........................................................112.1变速器主要参数的选择............................................................................................112.1.1档数和传动比..........................................................................................................................112.1.2中心距......................................................................................................................................112.1.3轴向尺寸..................................................................................................................................112.1.4齿轮参数..................................................................................................................................122.2各档传动比及其齿数的确定....................................................................................132.2.1确定一档齿轮的齿数..............................................................................................................132.2.2确定常啮合齿轮的齿数..........................................................................................................142.2.3确定常啮合齿轮副的齿数......................................................................................................142.2.4确定倒档齿轮的齿数..............................................................................................................152.3变位系数的选择........................................................................................................15第3章变位齿轮的强度计算与材料的选择....................................................................253.1齿轮的损坏原因及形式............................................................................................253.2齿轮的几何计算........................................................................................................183.2.1直齿圆柱齿轮的计算...............................................................................错误!未定义书签。83.2.2斜齿圆柱齿轮的计算..............................................................................................................193.3齿轮的强度计算与校核............................................................................................203.