【正文】 m, taking into account the mercial vehicles and the fort of the basic performance of the mercial requirements of the main dimensions of the vehicle parameters and performance parameters of the selected and calculated, on this basis to select and identify the various parts of the chassis powertrain, brake system and such as steering. Finally, with reference to the same general layout chassis model program to mediumsized passenger cars designed to carry out general layout chassis and a total mapping of the chassis layout. On the course of the design of the chassis, in order to make sure the fort and the safety of the automobilism, we check the interference movement of the steering system. On the course that we use the graphical method, check the different case when the steering system turn left or right. The analysis results indicate that all the design of the steering system are matching with reason and practicableness. Key words： Bus； Chassis； Layout； Bus Design 本科生畢業(yè)設(shè)計(jì)（論文） III 目 錄 第 1 章 緒 論 ........................................................................................................... 1 中型客車底盤概述 ...................................................................................... 1 中型 客車底盤的發(fā)展現(xiàn)狀 ............................................................. 1 中型客車底盤設(shè)計(jì)要求 ................................................................. 1 本論文研究的內(nèi)容 ...................................................................................... 2 第 2 章 主要參數(shù)及各部件的確定 ......................................................................... 4 底盤總體設(shè)計(jì)的特點(diǎn)和要求 ...................................................................... 4 汽車形式的選擇 .......................................................................................... 4 中型客車主要參數(shù)的選擇 .......................................................................... 5 主要尺寸參數(shù)的確定 ..................................................................... 5 主要質(zhì)量參數(shù)的確定 ..................................................................... 6 主要性能參數(shù)的確定 ..................................................................... 7 發(fā)動(dòng)機(jī)的選擇 ............................................................................................ 11 發(fā)動(dòng)機(jī)形式的選擇 ....................................................................... 11 發(fā)動(dòng)機(jī)主要性能指標(biāo)的選擇 ....................................................... 11 發(fā)動(dòng)機(jī)的懸置 ............................................................................... 12 傳動(dòng)系統(tǒng) .................................................................................................... 13 驅(qū)動(dòng)橋形式的選擇 ....................................................................... 13 離合器的選擇 ............................................................................... 13 變速器的選擇 ............................................................................... 15 傳動(dòng)軸的選擇 ............................................................................... 16 行駛系統(tǒng) .................................................................................................... 16 車架的形式 ................................................................................... 17 懸架的計(jì)算及形式的確定 ........................................................... 17 輪胎的選擇 ................................................................................... 19 后橋的選擇 ................................................................................... 19 轉(zhuǎn)向系統(tǒng) .................................................................................................... 20 前軸 ............................................................................................... 21 轉(zhuǎn)向器的選擇 ............................................................................... 21 轉(zhuǎn)向助力裝置 ............................................................................... 21 本科生畢業(yè)設(shè)計(jì)（論文） IV 制動(dòng)系統(tǒng) .................................................................................................... 22 行車制動(dòng) ....................................................................................... 23 駐車制動(dòng) ....................................................................................... 24 輔助制動(dòng) ....................................................................................... 24 第 3 章 總體布 置 ................................................................................................... 25 整車布置的基準(zhǔn)線 .................................................................................... 25 發(fā)動(dòng)機(jī)的布置 ............................................................................................ 26 傳動(dòng)系的布置 ............................................................................................ 26 轉(zhuǎn)向裝置的布置 ........................................................................................ 27 懸架的布置 ................................................................................................ 28 制動(dòng)系的布置 ............................................................................................ 29 踏板的布置 ................................................................................................ 30 車架總成的布置 ........................................................................................ 30 油箱和蓄電池的布置 ................................................................................ 31 第 4 章 運(yùn)動(dòng)校核 ................................................................................................... 32 原理與計(jì)算 ................................................................................................ 32 作圖方法 .................................................................................................... 32 第 5 章 平順性分析與懸架匹配分析 ................................................................... 34 客車平順性概述 ........................................................................................ 34 客車等效振動(dòng)分析 ....................................................................................