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1 推土機(jī)變速箱設(shè)計 摘要 本設(shè)計為推土機(jī)變速箱設(shè)計，其要求為變速箱結(jié)構(gòu)簡單，體積小，質(zhì)量輕， 工作可靠，使用方便。 首先確定變速箱的傳動方案，選用機(jī)械式人力換擋，五個前進(jìn)擋，四個倒 退擋。換擋方式采用人力換擋， 。然后進(jìn)行變速箱主要參數(shù)的確定，通過對齒輪 和州的設(shè)計選擇及強度計算，軸承的壽命驗算，以及變速箱符合設(shè)計要求。 關(guān)鍵詞：推土機(jī)，機(jī)械式變速箱，設(shè)計 2 Bulldozer Transmission Design Abstract Dozers gearbox design , its request for the transmission of simple structure, small size, light weight, reliable, easy to use. first determine the transmission gear box program, use mechanical human transmission, the five forward gears and four back block. Use of manpower shift mode. Then to determine the main parameters of transmission, through the design of the gear selection and intensity of state calculation, checking bearing life, and transmission line design. Keywords: bulldozers, mechanical transmission, the design 3 目 錄 一、推土機(jī)的傳動方案設(shè)計 ........................................................................................1 1.1 推土機(jī)傳動方案 ..................................................................................................1 1.2 變速箱的設(shè)計方案 ..............................................................................................2 1.3 傳動系統(tǒng)總傳動比 ..............................................................................................3 1.4.各部件傳動比的確定 ..........................................................................................3 二、變速箱主要參數(shù)的確定 ........................................................................................5 2.1 中心距的確定 ......................................................................................................5 2.2 齒輪模數(shù) ..............................................................................................................5 2.3 齒寬 B ...................................................................................................................6 2.4 選配齒數(shù) ..............................................................................................................7 三、齒輪設(shè)計 ..............................................................................................................11 3.1 齒輪強度計算 ....................................................................................................11 3.1.1 彎曲疲勞強度計算 ......................................................................................11 3.1.2 接觸疲勞強度計算 ......................................................................................14 3.2 齒輪材料、加工精度和結(jié)構(gòu)形狀 ....................................................................16 四. 變速器軸設(shè)計與計算 ...........................................................................................18 4.1.軸的強度校核 ....................................................................................................18 4.1.1 軸的材料選擇 ..............................................................................................18 4.1.2 軸的結(jié)構(gòu)設(shè)計 ..............................................................................................18 4.1.3 鍵聯(lián)接的強度校核 ......................................................................................18 4.1.4 計算支承反力彎矩及轉(zhuǎn)矩 ..........................................................................19 4.1.5 按彎扭合成應(yīng)力校核軸的強度 ..................................................................19 4.1.6 精確校核軸的疲勞強度 ..............................................................................20 4.1.7．軸的靜強度校核： ...................................................................................21 4.2.軸的剛度校核計算 ............................................................................................21 4.2.1 軸的彎曲剛度校核計算： ..........................................................................22 4.3 軸的扭轉(zhuǎn)剛度校核計算 ....................................................................................23 4.4 花鍵的設(shè)計計算 ................................................................................................24 4 五、軸承的設(shè)計與壽命計算 ......................................................................................26 5.1 求兩端軸承受到的徑向載荷和 和 ......................................................271Fr2 5.2 求兩軸承的計算軸向力 和 .....................................................................27a2 5.3 對于使用滾針組分析 ........................................................................................28 六、變速器操縱元件設(shè)計 ..........................................................................................30 參考文獻(xiàn) ......................................................................................................................31 致謝 ..............................................................................................................................32 齒輪和軸的介紹 ..........................................................................................................33