本科生毕业设计（论文）PAGEIV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的工况范围内工作。所以变速器的结构设计的合理性直接影响到汽车动力性和经济性。设计要求达到换挡迅速、省力、方便、有较高的工作效率、工作噪声低。因此变速器在汽车中得到广泛应用。本次设计的是五个前进档加一个倒档的中型专用车的变速器。为了使该变速器应用范围更加的广泛，应用到不同工程上，使得本变速器带有取力器。变速器采用中间轴式,换档形式采用的是同步器和滑移齿轮换档，使的换档方便，可靠。操纵机构设有自锁和互锁装置。先利用已知参数确定各挡传动比，再后确定齿轮的模数、压力角、齿宽等参数。由中心矩确定箱体的长度、高度和中间轴及二轴的轴径，然后对中间轴和各挡齿轮进行校核。在设计过程中，利用CAXA绘图，运用MATALAB软件编程。最后绘制装配图及零件图。通过本次设计，使所设计的变速器工作可靠，传动效率更高。关键词：变速器，同步器，齿轮，取力器AbstractTochangetheengineusedtospreadtransmissionoftorqueandwheelspeed,theaimofstartinginplace,climb,turnandaccelerateavarietyofdrivingconditions,differentvehicletractionandspeed,whiletheengineinthemostfavorablerangeconditions.Therefore,thereasonabilityofthestructuredesignofatransmissiongearboxdirectlyaffectsthevehicle'sdynamicperformance.Itisusuallyrequiredshiftinggearsrapidlyandconveniently,savingforce,andhavingahigherworkingefficiencyandlowworkingnoises.Thedesignofthefiveforwardfileplusareverseofthetransmissionmedium-sizedspecialvehicle.Inordertomakethetransmissionmorebroadrangeofapplications,applicationtoadifferentproject,makeacheckofthepowertransmissiondevice.Transmissionuseofthemiddleaxis,shiftingtheformofusingthesynchronizergearshiftandslidingtomaketheshifteasyandreliable.Manipulationofinstitutionswithself-lockingandinterlockingdevices.Usingthegivenbasicparameters,itwasfirstlydeterminedthetransmissionratioofeachshift,theshaftcenterdistances,thegearmodulus,thegearpressinganglesandwidths,andsoon.Andthenthegeneraldimensionofthegearbox,includingitslength,widthandheight,andthenontheintermediateshaftandtheblocktocheckgear.Duringthedesignprocess,usingCAXAmapping,theuseofsoftwareprogrammingMATALAB.ThefinalassemblydrawingandcomponentsdrawingFig.Throughthisdesign,sothatthedesignofthetransmissionofreliable,efficienttransmission.Keywords:Transmission,，Synchronizer，Gear，Takeoutofpower目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc233353429"第一章前言PAGEREF_Toc233353429\h1HYPE