【正文】 in matches the overrall design Abstract:Automobile power is the basic and the most important function of Automobile． Through the analysis and calculation， the article proofread the power matching of bus， choosing the best power unit， insured the good function of the automobile． Car performance will not only depend on the performance of the various ponents of the position of cars, and depends largely on the coordination and cooperation of the various ponents, depending on the general arrangement。s design quality, performance and product vitality decisive influence. Key words： automobile 。 calculation 中型載貨汽車動(dòng)力總成匹配與總體設(shè)計(jì) 目 錄 摘 要 ........................................................................................................................................................... II Abstract ......................................................................................................................................................... II 引 言 .......................................................................................................................................................... 1 ............................................................................................................................................. 2 ................................................................................................................. 3 發(fā)動(dòng)機(jī)的選擇 ................................................................................................................................. 3 發(fā)動(dòng)機(jī)的最大功率及轉(zhuǎn)速的確定 ...................................................................................... 3 發(fā)動(dòng)機(jī)的最大轉(zhuǎn)矩及其轉(zhuǎn)速的確定 .................................................................................. 4 輪胎的選擇 ..................................................................................................................................... 5 傳動(dòng)系最小傳動(dòng)比的確定 .............................................................................................................. 6 傳動(dòng)系最大傳動(dòng)比的確定 ............................................................................................................. 6 ................................................................................................................................. 8 發(fā)動(dòng)機(jī)的選型 ................................................................................................................................. 8 離合器的初步選型 ......................................................................................................................... 8 變速器的選擇 ............................................................................................................................... 10 傳動(dòng)軸的選型 ............................................................................................................................... 11 驅(qū)動(dòng)橋的選型 ............................................................................................................................... 11 驅(qū)動(dòng)橋結(jié)構(gòu)形式和布置形式的選擇 ................................................................................ 11 主減速器結(jié)構(gòu)形式選擇 .................................................................................................... 12 驅(qū)動(dòng)橋的選型 .................................................................................................................... 12 ........................................................................................................................................... 14 發(fā)動(dòng)機(jī)外特性 ................................................................................................................................ 14 汽車動(dòng)力性能計(jì)算 ....................................................................................................................... 14 汽車經(jīng)濟(jì)性能計(jì)算 ....................................................................................................................... 21 ............................................................................................... 26 發(fā)動(dòng)機(jī)和傳動(dòng)系各部件選型 ........................................................................................................ 26 各部件的性能校核 ........................................................................................................................ 26 發(fā)動(dòng)機(jī)性能校核 ................................................................................................................. 26 離合器性能參數(shù)校核 ......................................................................................................... 27 變速器性能校核 ................................................................................................................. 28 傳動(dòng)軸 006 性能校核 ......................................................................................................... 28 驅(qū)動(dòng)橋性能校核 ................................................................................................................. 28 設(shè)計(jì)總結(jié) ...................................................................................................................................................... 29 參考文獻(xiàn) ...................................................................................................................................................... 30 中型載貨汽車動(dòng)力總成匹配與總體設(shè)計(jì) 1 引 言 汽車性能的優(yōu)劣不僅取決于組成汽車的各部件的性能，而且在很大程度上取決于各部件的協(xié)調(diào)和 配合，取決于總體布置；總體設(shè)計(jì)水平的高低對(duì)汽車的設(shè)計(jì)質(zhì)量、使用性能和產(chǎn)品的生命力起決定性的影響。 由此，汽車具備系統(tǒng)的屬性，對(duì)環(huán)境表現(xiàn)出整體性，一輛子系統(tǒng)屬性匹配協(xié)調(diào)的汽車所具備的功能大于組成它的各子系統(tǒng)功能純粹的、簡單的總和；反之，如果子系統(tǒng)的屬性因無序而相互干擾，即便是 個(gè)體性能優(yōu)良的子系統(tǒng)，其功能也會(huì)因相互扼制而抵消，功率循環(huán)就是這樣的典型例子。汽車設(shè)計(jì)任務(wù)的等級(jí)形態(tài)表現(xiàn)為：上位設(shè)計(jì)任務(wù)是確定下位設(shè)計(jì)任務(wù)要實(shí)現(xiàn)的目標(biāo)，下位設(shè)計(jì)是實(shí)現(xiàn)上位設(shè)計(jì)功能的手段，上、下位體系可從總體設(shè)計(jì)逐級(jí)分至零件設(shè)計(jì)，總體設(shè)計(jì)無疑處于這種體系的最上位，設(shè)計(jì)子系統(tǒng)的全部活動(dòng)必須在總體設(shè)計(jì)構(gòu)建的框架內(nèi)進(jìn)行。 2 設(shè)計(jì)總質(zhì)量量為 。參考該題目中的參數(shù)，按要求設(shè)計(jì)的載貨汽車最高車速是 ua=120km/h，那么發(fā)動(dòng)機(jī)的最大功率應(yīng)該大于或等于以該車速行駛時(shí)，滾動(dòng)阻力功率與空氣阻力功率之和，即 )761403600(1 ma x3ma xma x aDaTe uACugfmP ?? ? （ 21） 式中， Pemax是發(fā)動(dòng)機(jī)的最大功率（ KW）； η T是傳動(dòng)系效率（包括變速器、輔助變速器傳動(dòng)軸萬向節(jié)、主減速器的傳動(dòng)效率）， η T=，傳動(dòng)系各部件的傳動(dòng)效率參考了機(jī)械工業(yè)出版社的《汽車設(shè)計(jì)課程設(shè)計(jì)指導(dǎo)書》表 1