第1頁(yè)共50頁(yè)1目錄設(shè)計(jì)任務(wù)書3引言5原理部分61發(fā)動(dòng)機(jī)工作原理61.1發(fā)動(dòng)機(jī)性能術(shù)語(yǔ)與參數(shù)61.2四沖程汽油發(fā)動(dòng)機(jī)的工作原理81.3二沖程發(fā)動(dòng)機(jī)工作原理10摩托車發(fā)動(dòng)機(jī)結(jié)構(gòu)與設(shè)計(jì)部分121發(fā)動(dòng)機(jī)機(jī)體121.1汽缸直徑131.2氣缸工作容積、燃燒室容積和氣缸總?cè)莘e131.3壓縮比141.4氣缸工作內(nèi)壓力、氣缸總推力141.5氣功蓋151.6燃燒室162曲柄連桿機(jī)構(gòu)的受力分析與平衡172.1曲柄連桿比172.2曲柄連桿機(jī)構(gòu)運(yùn)動(dòng)學(xué)172.3連桿的角位移、角速度、角加速度183活塞運(yùn)動(dòng)分析193.1活塞位移193.2活塞速度分析20第2頁(yè)共50頁(yè)23.3活塞的加速度223.4熱力強(qiáng)度234活塞組244.1活塞244.2氣環(huán)284.3油環(huán)314.4活塞銷325連桿、曲軸組345.1連桿345.1.1連桿承受的載荷345.1.2連桿小頭的安全系數(shù)355.1.3連桿大頭的強(qiáng)度驗(yàn)算365.2曲軸銷的設(shè)計(jì)385.3曲軸385.3.1組合式曲軸39設(shè)計(jì)小結(jié)44附圖46參考文獻(xiàn)49摘要畢業(yè)設(shè)計(jì)是機(jī)械設(shè)計(jì)課程重要的綜合性與實(shí)踐性教學(xué)環(huán)節(jié)，通過(guò)畢業(yè)設(shè)計(jì)可綜合運(yùn)用機(jī)械設(shè)計(jì)課程和其他先修課程的知識(shí)，分析和解決機(jī)械設(shè)計(jì)問(wèn)題，進(jìn)一步鞏固、加深和拓寬所學(xué)的知識(shí)。作為機(jī)械類工科學(xué)生，完成了此項(xiàng)教學(xué)環(huán)節(jié)，也就為完成本科學(xué)業(yè)及將來(lái)的畢業(yè)設(shè)計(jì)奠定了良好的基礎(chǔ)。第3頁(yè)共50頁(yè)3傳統(tǒng)的畢業(yè)設(shè)計(jì)題目常選用通用機(jī)械的傳動(dòng)裝置，例如以齒輪減速器為主體的機(jī)械傳動(dòng)裝置。其主要內(nèi)容包括：傳動(dòng)裝置的總體設(shè)計(jì)；傳動(dòng)零件、軸、軸承、聯(lián)軸器等的設(shè)計(jì)計(jì)算和選擇；裝配圖和零件圖設(shè)計(jì)；編寫設(shè)計(jì)計(jì)算說(shuō)明書。現(xiàn)選擇以摩托車發(fā)動(dòng)機(jī)傳動(dòng)和變速部分為主的新設(shè)計(jì)課題，設(shè)計(jì)方法采用常規(guī)手段與微機(jī)輔助相結(jié)合。該新題目較經(jīng)典課題更具復(fù)雜性和體現(xiàn)時(shí)代氣息，涉及的機(jī)構(gòu)及零部件增多，所覆蓋的知識(shí)面更廣泛，結(jié)構(gòu)設(shè)計(jì)難度加大，設(shè)計(jì)時(shí)要求學(xué)生綜合考慮諸多因素，自己分析和解決問(wèn)題，可以幫助學(xué)生樹立正確的設(shè)計(jì)思想，增強(qiáng)創(chuàng)新意識(shí)和競(jìng)爭(zhēng)意識(shí)。關(guān)鍵詞：摩托車發(fā)動(dòng)機(jī)；分析和解決問(wèn)題；設(shè)計(jì)；AbstractCurriculumdesignisimportantmechanicaldesigncoursesintegratedwithpracticeteaching,Throughcoursesdesignedtomakecomprehensiveuseofmechanicaldesigncoursesandothercoursesofthepre-knowledge.Analyzeandsolvemechanicaldesignissuesandfurtherstrengthen,deepenandbroadentheknowledgelearned.Asamechanicalengineeringstudents,completedtheteachingaspectofitforthecompletionofundergraduatestudiesandgraduatedfromthedesignofthefuturelaidagoodfoundation.Thetraditionalcurriculumdesignoftenchoosetopicsofgeneralmachinerydrives,suchasgearreducerforthemainmechanicalgear.Itsmaincontentsinclude:transmissionoftheoveralldesign；transmissionparts,axle,bearings,couplings,suchascomputingandthedesignofchoice；assemblyandpartsmapdesign；designcalculationspreparedstatement.Nowchoosetomotorcycleengineandtransmissionspeedofthemaintopicsofthenewdesign,usingconventionaldesignmethodsandmeansofcombiningcomputer-assisted.Thenewtitleismorecomplexthantheclassicissuesofthetimesandtheatmosphere,thebodiesandpartsincreasedbymoreextensivecoverageofknowledge,difficulttodesignthestructure,designedforstudentsconsideredmanyfactors,analyzeandsolvetheirownProblems,canhelpstudentstoestablishthecorrectdesignideas,strengthentheirsenseofinnovationandthesenseofcompetition.Keywords:Motorcycleengine,analysisandproblem-solving；design；第4頁(yè)共50頁(yè)4機(jī)械零件畢業(yè)設(shè)計(jì)任務(wù)書題目：設(shè)計(jì)南方NF125摩托車發(fā)動(dòng)機(jī)汽缸部件a、技術(shù)參數(shù)和原始數(shù)據(jù)沖程缸數(shù)冷卻方式總排氣量壓縮比面積*行程最大功率/相應(yīng)轉(zhuǎn)速Kw/（r/min）最大扭矩/相應(yīng)轉(zhuǎn)速Kw/（r/min）燃油消耗率工作阻力241風(fēng)冷100124ml6：1S(2mm)H(mm)eP/neM/negml/kw.h1.3Mpb、設(shè)計(jì)參數(shù)系列參數(shù)組數(shù)S(2mm)H(mm)最大功率/相應(yīng)轉(zhuǎn)速Kw/（r/min）最大扭矩/相應(yīng)轉(zhuǎn)速Kw/（r/min）燃油消耗率156507.5/75009.5/6000410268608.8/750010.8/60004203806510/860011.5/6000650c、設(shè)計(jì)參數(shù)代號(hào)（組數(shù)）組合選定沖程數(shù)