【正文】 rantee the safety of travelling,This shows that, The braking system design of practical significance. The braking system is one of important system of active safety. Based on the structural analysis and the design requirements of intermediate car’s braking system, a braking system design is performed in this thesis, according to the national and professional standards. First through analyzing the main parameters of the entire vehicle, the braking system design starts from determination of the structure scheme. SecondlyCalculating and determining the main dimension and structural type of the front、 rear drum brake，brake master cylinder ans so on， Finally use of puteraided design drawing draw the engineering drawings of the front and rear brakes, the master brake cylinder, the diagram of the brake pipelines. Furthermore, each target of the designed system is analyzed for checking whether it meets the requirements. some factors are considered in this thesis, such as simple structure, low costs, and environmental protection, etc. The result shows that the design is reasonable and accurate, paring with the related national standards. Key words： light truck； brake； drum brake； master cylinder； hydraulic pressure system 本科生畢業(yè)設(shè)計（論文） III 目 錄 第 1 章 緒 論 ........................................................................................................... 1 本次制動系統(tǒng)設(shè)計的意義 ........................................................................ 1 本次制動系統(tǒng)應(yīng)達到的目標(biāo) .................................................................... 2 本次制動系統(tǒng)設(shè)計內(nèi)容 ............................................................................ 2 汽車制動系統(tǒng)的組成 ................................................................................ 3 制動系統(tǒng)類型 ............................................................................................. 3 制動系工作原理 ........................................................................................ 3 第 2 章 汽車制動系統(tǒng)方案確定 ............................................................................. 5 汽車制動器形式的選擇 ............................................................................ 5 鼓式制動器的優(yōu)點及其分類 .................................................................... 6 盤式制動器的缺點 .................................................................................... 7 制動驅(qū)動機構(gòu)的結(jié)構(gòu)形式 ........................................................................ 8 簡單制動系 ...................................................................................... 8 動力制動系 ...................................................................................... 9 伺服制動系 ...................................................................................... 9 制動管路的形式選擇 .............................................................................. 10 液壓制動主缸方案的設(shè)計 ...................................................................... 11 第 3 章 制動系統(tǒng)主要參數(shù)的確定 ..................................................................... 13 輕型貨車主要技術(shù)參數(shù) .......................................................................... 13 同步附著系數(shù)的 0? 的確定 ..................................................................... 13 前、后輪制動力分配系數(shù) ? 的確定 ...................................................... 14 鼓式制動器主要參數(shù)的確定 .................................................................. 14 制動器制動力矩的確定 .......................................................................... 15 制動器制動因數(shù)計算 .............................................................................. 16 鼓式制動器零部件的結(jié)構(gòu)設(shè)計 .............................................................. 17 第 4 章液壓制動驅(qū)動機構(gòu)的設(shè)計計算 ................................................................. 21 制動輪 缸直徑 d 的確定 ........................................................................... 21 制動主缸直徑 d0 的計算 ........................................................................ 21 制動踏板力 PF ......................................................................................... 22 本科生畢業(yè)設(shè)計（論文） IV 制動踏板工作行程 Sp ............................................................................ 22 第 5 章 制動性能分析 ........................................................................................... 23 制動性能評價指標(biāo) .................................................................................. 23 制動效能 .................................................................................................. 23 制動效能的恒定性 .................................................................................. 23 制動時汽車的方向穩(wěn)定性 ...................................................................... 24 前、后制動 器制動力分配 ...................................................................... 24 地面對前、后車輪的法向反作用力 ........................................... 24 理想的前、后制動器制動力分配曲線 ....................................... 25 實際的前、后制動器制動力分配曲線 ....................................... 25 制動距離 S .............................................................................................. 25 汽車能夠停留在極限上下坡角度計算 .................................................. 26 第 6 章 總 結(jié) ......................................................................................................... 27 參考文獻 ................................................................................................................. 28 致謝 ......................................................................................................................... 29 附 錄 1.................................................................................................................... 30 附 錄 2.................................................................................................................... 37 本科生畢業(yè)設(shè)計（論文） 1 第 1章 緒 論 汽車工業(yè)是一個綜合性產(chǎn)業(yè)，汽車工業(yè)的生產(chǎn)水平，能夠代表一個國家的整個工業(yè)水平，汽車工業(yè)的發(fā)展，能夠帶動各行各業(yè)的發(fā)展，進而促進我國工業(yè)生產(chǎn)的總體水品。 隨著我國經(jīng)濟的發(fā)展，尤其我國對外貿(mào)易的不斷擴大，汽車工業(yè)受到國外同行業(yè)的強烈競爭，而我國汽車工業(yè)起步比較晚，生成技術(shù)水平較低，因而改進和提高我國的汽車性能及其機構(gòu)是一個 迫在眉睫的問題，這關(guān)系到我國汽車工業(yè)的生存與發(fā)展的大事。盡可能提