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攀枝花学院本科毕业设计（论文）[新型折叠自行车设计]学生姓名：冯立波学生学号：201210601026院（系）：机械工程学院年级专业：2012级机制一班指导教师：陈永强副教授二〇一六年五月攀枝花学院本科毕业设计（论文）摘要I摘要一般折叠车有着车架折叠关节、立管折叠关节等结构构成。通过车架折叠，将前后对折在一起，可减少一半左右的长度。整车在折叠后体积小巧便于携带。在折叠的过程中也不需要借助外来工具，可手动将车折叠展开。在折叠后通过座杆做为支撑点以使折叠后能立稳。本文将介绍的折叠购物自行车，是一款可以折叠成为购物车的轻便型自行车，可以实现向左右两个方向的折叠，本款折叠自行车新增了其特有的折叠卡扣形式，使自行车折叠较传统折叠自行车更加简单易用，老少皆会操作。它主要为了交通、购物带来了更多的便利，随着如今消费水平的提高，人民购物频繁且多样，超市购物车无法带回家，所以便携式折叠购物车影起了社会上更多的人关注，M型便携式折叠购物的特点是：便携式折叠购物采用的是一种全新的折叠卡扣方式，可以轻松折叠或打开。折叠或打开速度最快。折叠后可以像购物车那样推行、载货。骑行安全靠。整车重量轻。关键词自行车，同步带轮，折叠，购物攀枝花学院本科毕业设计（论文）ABSTRACTIIABSTRACTGenerally,aFoldingBikeconsistsofthejointsofframefoldingandthejointsofverticalpipefolding.Throughthefolioinfrontandback,thelengthshalfapproximatelyhalfwillbereducedeasily,thatistosay,it’smoreconvenientforpeopletotakealongitanywhereafterfolded.Inaddition,itdoesn’tneedanytoolswhenfoldingandanyonecanunfolditeasily.ThemostimportantisthisFoldingBikesstillcanbestable,asitisonthefoundationofseatpost,itssupportingpoint.ThepapermainlyintroducestheFoldingShoppingBike,whichisakindofbicyclethatcanbecometheportableshoppingcartafterfolded.ThepriorityforthisFoldingShoppingBikeisitsuniquefoldingsnapjointassemblies,makingitmoreconvenientforpeopleincludingtheoldandchildrentooperateitcomparedwiththetraditionalone.ThiskindofFoldingShoppingBikebringsmoreconvenienceintrafficandshoppingtopeoplearoundtheworld.Withtherapidimprovementoftheconsumptionlevel,peoplegotothedifferentkindsofsupermarketsmorefrequentlyandtheyarewillingtopurchasemoregoods,soit’sinconvenientforpeopletousethetraditionalshoppingcartstotakethesegoodshome.Therefore,morepeopleintheworldpaymuchmoreattentiontotheportablefoldingshoppingcarts.Thecharacteristicsofitareasfollows.First,itadoptsthefoldingsnapjointsassemblies,makingiteasiertofoldandunfold.Second,peoplecanfoldandunfolditinaveryfastspeed.Third,itcancarryonheaviercargosanditcanbepushedforwardjustliketheshoppingcartsinsupermarkets.Forth,itismuchsaferandmuchmorepractical.Keywordsbike，folding，synchronouspulley，shoppingcarts攀枝花学院本科毕业设计（论文）目录-1-目录摘要.............................................................................................................................IABSTRACT................................................................................................................II1绪论.........................................................................................................................31.1概述..................................................................................................................................31.2自行车的研究现状..........................................................................................................41.3课题研究的目的及意义..................................................................................................61.4本课题主要研究内容......................................................................................................61.5自行车材料探究..............................................................................................................62传统折叠自行车介绍..............................................82.1折叠自行车的起源....................................................82.2折叠自行车的折叠方式................................................92.3自行车的保养.......................................................103折叠购物自行车系统结构及组成...................................123.1系统结构...........................................................123.2组成...............................................................123.3部件...............................................................124折叠购物自行车的结构设计.......................................144.1方案的对比与车梁结构形式的确定.....................................144.2整体车架结构设计...................................................164.2.1人一自行车系统.............................................164.2.2影响自行车性能的人体因素.....................................174.2.3折叠购物自行车折叠设计.......................................184.2.4大梁折叠扣设计...............................................194.3滚子链轮的传动结构设计.............................................194.3.1输入功率的计算...............................................194.3.2链轮传动结构设计............................................204.4折叠销钉卡扣结构强度设计...........................................234.4.1卡扣的结构强度设计..........................................234.4.2销轴的结构强度设计..........................................244.5车梁的结构强度设计及计算...........................................26攀枝花学院本科毕业设计（论文）目录-2-4.5.1前车轴结构设计...............................................264.5.2后车轴结构设计...............................................294.6车梁强度的计算.....................................................334.7刹车装置的设计.....................................................354.7.1刹车的作用...................................................354.7.2刹车装置的分类和区别.........................................364.7.3刹车装置的设计...............................................38参考文献..........................................................40致谢............................................................41攀枝花学院本科毕业设计（论文）绪论-3-1绪论1.1概述自行车发明至今已有200多年的历史。今天，自行车作为交通代步、锻炼身体、越野旅游、运动比赛以及少量货物运送工具，已遍及到世界的每个角落。但它的发明和改进