机械5

摘要 本题目是背包式自行车，休闲娱乐类自行车,折叠后占用空间较小，可以放入专用背包，为主要设计对象，设计出可折叠式使用寿命长，容易维修，可在路面长时间行驶，安全性能高的自行车。在现今社会中，生活节奏越来越快，交通状况越来越差，污染与能源消耗越来越严重，自行车作为一种包含了交通代步、锻炼身体、旅游、比赛以及少量货物运送的工具，越来越受到人们的青睐。 相对于原始的自行车，折叠式自行车在外形上的改良成为消费者的一大吸引力。除此之外，在更适合现今人们对生活的要求：方便携带，使用简单，骑乘舒适灵活等方面，使折叠自行车越来越成为人们购买自行车时得一大选择，市场竞争力也随之增长。折叠式自行车在现今市场上依旧比较少见，其原因主要在于其市面已有结构设计部分不合理，使用的稳定性不高，至此导致市面上多为折叠式自行车较为少见因此设计出一种顺应时代的发展的折叠自行车将成为设计者的又一挑战。要设计好一款好的折叠自行车就要很好的分析各种现存的结构，在结合其他所有现存的东西来寻求能够使体积缩小的结构与折叠方式，从而能够设计出一台具有划时代意义的背包式折叠自行车。 关键词：自行车，背包式折叠自行车 Abstract This topic is backpack bicycle,leisure a
nd e
ntertai
nme
nt bicycle.After foldi
ng,it takes up less space a
nd ca
n be put i
nto a special backpack.It is the mai
n desig
n object to desig
n a foldable bicyclewith lo
ng service life,easymai
nte
na
nce,lo
ng-time drivi
ng o
n the road a
nd high safetyperforma
nce.I
n today's society,the pace of life is faster a
nd faster,the traffic co
nditio
n isworse a
ndworse,a
nd the pollutio
n a
nd e
nergyco
nsumptio
n are more a
nd more serious.As a mea
ns of tra
nsportatio
n,exercise,tourism,competitio
n a
nd a small amou
nt of goods tra
nsportatio
n,bicycle is more a
nd more favored bypeople. Comparedwith the origi
nal bicycle,the improveme
nt of foldi
ng bicycle i
n appeara
nce has become a big attractio
n for co
nsumers.I
n additio
n,foldi
ng bicycles are more a
nd more suitable for people's dailylife: co
nve
nie
nt to carry,simple to use,comfortable a
nd flexible to ride,which makes foldi
ng bicycles become a big choicewhe
n people buybicycles,a
nd the market competitive
ness also i
ncreases.Foldi
ng bicycles are still rare i
n today's market.The mai
n reaso
n is that the existi
ng structural desig
n is u
nreaso
nable a
nd the stabilityof use is
not high.So far,most of the foldi
ng bicycles i
n the market are rare.Therefore,itwill be a
nother challe
nge for desig
ners to desig
n a foldi
ng bicycle that co
nforms to the developme
nt of the times.I
n order to desig
n a good foldi
ng bike,it is
necessaryto a
nalyze all ki
nds of existi
ng structures,a
nd fi
nd the structure a
nd foldi
ngwaythat ca
n reduce thevolume bycombi
ni
ngwith all other existi
ng thi
ngs,so as to desig
n a backpack foldi
ng bikewith epoch-maki
ng sig
nifica
nce. Keywords: bicycle,backpack foldi
ng bicycle 目录 摘要2 Abstract 3 目录4 第1章绪论6 1.1课题研究背景6 1.2课题研究目的6 1.3课题的意义7 1.4种类发展现状7 1.5自行车的设计分析9 第2章人体工程学与自行车设计11 2.1设计原则11 2.2人机工程设计设计14 2.3影响自行车性能的人体因素15 2.4自行车设计结构要素分析17 2.5人一车动态特性分析20 第3章背包式自行车总体方案21 3.1背包式自行车的构成21 3.2背包式自行车方案设计23 第4章背包式自行车机械部分计算24 4.1功率的计算24 4.2传动比25 4.3前后链轮之间的链传动设计25 4.3.1设计要求25 4.3.2设计过程25 4.4轴的设计28 4.4.1链轮上力的计算28 4.4.2材料28 4.4.3计算轴的最小直径28 4.4.4轴的结构设计28 4.5轴的校核29 4.6键的校核30 4.7轴承的校核31 第5章三维图的设计33 结论37 参考文献37