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1、武汉理工大学毕业论文绪论1．内容提要本文详细介绍了机械式五挡三轴式变速器的具体过程。阐述了机械式变速器的功用、要求，介绍了变速器各种结构方案，说明了变速器主要参数的确定方法，齿轮的几何计算、强度计算等计算方法。涉及到了同步器的设计，概括同步器工作原理和工作过程，设计计算和轴承寿命的计算方法。变速器一般安装于发动机和驱动桥之间，其主要的功用是：1．变速与变矩通过改变变速器的传动比，可以使汽车在不同的使用条件下得到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。2．设置倒档和空档在不改变发动机旋转方向的情况下便汽车能倒退行驶，在滑行或停车时发动机
2、和传动系能保持分离。3．变速器一般还应设置动力输出窗口。合理的设计和布置变速器使得发动机功率得到最合理的利用，而提高汽车动力性和经济性。本设计主导思想即在于设计以提高汽车的动力性和经济性指标，具备较高的传动效率，操纵轻便，工作可靠，噪声小为目的的机械式变速器。由于水平有限，难免有很多不足之处，欢迎大家批评指正。SummaryThistextdetailhasbeenintroducedtheconcretecoursetodesignonemedium-sizedmechanicaltypetransmission.Hasexpoundedthefun
3、ctionofmechanicaltypetransmissionandtherequirement,andhasintroducedthevariousstructureschemesofgearbox,andexplaindthatthemajorparameteroftransmissiondecidesthemethodsurely,thegeometrycomputationalmethodssuchascalculationandintensitycalculationetcofgearwheel.Involvethecomputation
4、almethodofthedesignofsynchronizer,briefsynchronizerworkprincipleandworkcourse,designcalculationandbearinglifespan.Involvingthemedium-sizedfreighttraintransmissiondesigninthisdesignpossessesthecontrollabilityabilityofbettermotiveforce,economyandgoodowingtothemachinerytransmission
5、,andjusteasilyequipsthemeritssuchasunassumingmaintenancesetc,andgetstheextensiveapplicationinthesocietyofmoderntimesThetransmissiongenerallyloadsbetweenengineanddrivebridge,andmajoractonbeingthespeedchangebecomesthecarpenter'ssquare,andsetsuptoreversegearandtheneutralposition,wi
6、ththepoweroutputneedsofsatisfiedautomobileunderthedifferenceoperatingmodes.Reasonabledesignandfixingupthatthetransmissionmakesthattheenginemeritrategetsthemostreasonableutilization,andautomobilemotiveforceandeconomyareraised.Namelytheleadingthoughtofthisdesigndependsonmotiveforc
7、eandeconomyquotainordertoraisetheautomobileofdesign,andhavingthehighertransmissionefficiency,andoperateslightly,workisreliable,thesmallmechanicaltypetransmissionthatserveasthepurposeofnoise.Owingtothefactthatthestandardislimited,haringtoavoidtohavealotofshortcomings,everybodycri
8、ticizesandmakesacommentthewelcome.第28页共28页武汉理工大
