摘要近年来，虽然许多国家都投入大量资金人力研究电动汽车，但目前为止变速器和其它一些关键性技术还没有取得有效地突破，变速器的续驶里程和充电时间大大制约了电动汽车的发展和普及。因此，在变速器问题解决之前，如何合理地选择这些部件及有关参数，使匹配达到最优，在相同变速器条件下，更好地满足动力性要求和最大地增加续驶里程，一直是研究者们追求的目标，也是本论文研究的主要目的。随着科学技术的进步，汽车工业得到了迅速发展，而人类对舒适性的更高追求，使得自动变速器的发展更加深入。本文通过对行星齿轮传动变速器的研究和阐述，计算了每个行星排传动比的表达式。通过此次设计，我们可以了解到该变速器的基本结构：即换挡执行元件（2个离合器和3个制动器）与行星排以适当方式连接组成，得到5个前进档和1个倒档。采用该机构的汽车自动变速器，结构简单紧凑、档位数多、传动效率高、换档平稳、操纵性能好。关键词：机械工程、变速器、行星齿轮传动ABSTRACTAlthoughinrecentyears,manycountrieshaveinvestedheavilyinhumanresearchelectriccars,butsofarthetransmissionandotherkeytechnologyhasnotbeeneffectivelybreakthrough,traveldistancetransmissionandchargingtimegreatlyrestrictthedevelopmentofelectricvehiclesandpopularity.Beforetransmissionproblems,therefore,howtoreasonablyselectthesecomponentsandrelatedparameters,tomatchtheoptimal,undertheconditionofthesametransmission,tobettermeettheperformancerequirementsandthetraveldistanceincreased,theearthhasbeenthetargetoftheresearchers,isalsothemainpurposeofthisthesis.Withtheprogressofscienceandtechnology,theautomotiveindustrygotrapiddevelopment,andthehumanthehigherpursuitofcomfort,makethedevelopmentofautomatictransmissionmoredeeply.Inthispaper,basedontheresearchoftheplanetarygeartransmission,andcalculatedtheexpressionofeachrowratio.Throughthisdesign,wecanlearnthebasicstructureofthetransmission:namelyshiftactuators(23clutchandbrake)andplanetarylineconnectioninthepropermanner,getfiveforwardgearsandonereversegear.Usingtheautomobileautomatictransmission,simpleandcompactstructure,thegearnumber,hightransmissionefficiency,smoothshift,goodcontrolperformance.Keywords:mechanicalengineering,transmission,epicyclegeartransmission.目录摘要..................................................................................................................1ABSTRACT.............................................................................................................2目录....................................................................................................................4第一章绪论......................................................................................................71.1引言........................................................................................................71.2混合动力汽车概述................................................................................71.3混合动力汽车国内外研究发展现状.....................................................81.3.1日本混合动力/电动汽车发展概况............................................91.3.2美国混合动力/电动汽车发展概况..........................................101.3.3欧洲混合动力/电动汽车发展概况..........................................111.3.4国内发展概况...........................................................................121.4混合动力汽车原理..............................................................................131.4.1混合动力汽车原理....................................................................131.5汽车传动...
