【正文】 結(jié)構(gòu)形式是多種多樣的，這是由于各國汽車的使用、制造及修理等條件不同，也是由各種類型汽車的使用條件不同所決定的。采用斜齒輪傳動及選擇合理的變位系數(shù)，提高制造精度和安裝剛性可以減小齒輪的噪音。5. 傳動率高。為減輕駕駛員的疲勞強(qiáng)度，提高行駛安全性，操縱輕便的要求日益顯得重要，這可以通過采用同步器和預(yù)選氣動換擋或自動、半自動換擋來實現(xiàn)。在汽車整體設(shè)計時，根據(jù)汽車在重量、發(fā)動機(jī)參數(shù)及汽車使用要求，選擇合理的變速器檔數(shù)及傳動比，來滿足這一要求。③Using neutral, severances the power transmission, to make the engine start, idle, and is advantageous for the engine to shift gears or to carry on the dynamic output. This gearbox has five (including over drive—fifth gear) and a reverse gear, and through the inertial type of synchronizer to realize shift gears.Key word ：transmission, inertial type of synchronizer,gear ratio, countershaft,second axis, gear目錄摘 要 ..............................................................................................................................IAbstract..........................................................................................................................II第 1 章 變速器的概述 ..................................................................................................1 變速器功用及設(shè)計要求 .................................................................................1 汽車變速器的功用 ................................................................................1 變速器的設(shè)計要求 ................................................................................1 設(shè)計任務(wù)及主要數(shù)據(jù) .....................................................................................2第 2 章 變速器的選擇及主要零件設(shè)計 ......................................................................3 變速器的選擇 .................................................................................................3 兩軸式變速器與三軸式變速器 .............................................................3 倒檔傳遞方案 .................................................................................................5 變速器主要零件的分析 .................................................................................6 齒輪型式 ................................................................................................6 換擋結(jié)構(gòu)形式 ........................................................................................7 軸承形式 .........................................................................................................7 傳動方案的最終設(shè)計 .....................................................................................8第 3 章 變速器傳動機(jī)構(gòu)的計算 ..................................................................................9 變速器主要參數(shù)的選擇 .................................................................................9 檔位數(shù)的確定及傳動比初選 ................................................................9 中心距的確定 ........................................................................................9 傳動零件的設(shè)計 ....................................................................................9 齒輪材料、壓力角 α、螺旋角 β 和齒寬 b........................................10 各檔齒輪參數(shù)的確定 ..........................................................................11 變速器齒輪的強(qiáng)度計算 ...............................................................................14 齒輪的損壞原因及形式 ......................................................................14 齒輪的強(qiáng)度計算與校核 ......................................................................14 齒輪接觸強(qiáng)度的校核 ..........................................................................16第 4 章 變速器軸的強(qiáng)度計算與校核 ........................................................................18 變速器軸的結(jié)構(gòu)和尺 ....................................................................................18 軸的結(jié)構(gòu) ..............................................................................................18 確定軸的尺寸 ......................................................................................19 軸的校核 .......................................................................................................19 第一軸的強(qiáng)度與剛度校核 ..................................................................19 第二軸的校核計算 ..............................................................................20第 5 章 變速器同步器與操縱機(jī)構(gòu)的設(shè)計 ................................................................23 同步器的設(shè)計 ................................................................................................23 同步器的結(jié)構(gòu) ......................................................................................23 同步環(huán)主要參數(shù)的確定 ......................................................................24 變速器的操縱機(jī)構(gòu) .......................................................................................26 變速器操縱機(jī)構(gòu)的功用 ......................................................................26 設(shè)計變速器操縱機(jī)構(gòu)時，應(yīng)滿足的條件 ..........................................26結(jié)論 ..............................................................................................................................28參考文獻(xiàn) ......................................................................................................................