【正文】 TRANSMISSION SYSTEM OF VEHICLE ABSTRACT The transmission transmate the high output engine speed down to meet the needs of the vehicle. However,people who knew about the transfer case are not so many, but it has an important application on the project vehicles. Its output is from the transmission and the power is assigned to the drive axle vehicles to meet the needs of the force’s distribution. This design’s specification is in accordance with the design requirements and uses the latest reference materials to ensure that the design is advanced and scientific. The work is carried out by an overview of the movement of the gear , the driving force for the selection of parameters and calculation, the gear check and structural strength of the design, the axis design and verification and the check of the bearing life. It uses the knowledge of material mechanics and theoretical mechanics, and apply the mathematical tools which is popular software MATLAB,to check the strength of the axis .And then the bending strength of the shaft for a precise check to make the leastest of the material and cost savings to meet the strength requirements. The results of this design is to achieve a transfer case which has a simple structure, reliable operation, easy maintenance and low cost of maintenance. This technical level has achieved the similar type level in the domestic. KEY WORDS: transfer case, winch, spline shaft, drive axle, gear shaft 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） III 目 錄 前 言 ....................................................................................................... 1 第 1 章 分動箱的工作情況概述 ........................................................ 3 分動箱的工作情況 ................................................................... 3 第 2 章 傳動裝置的運(yùn)動和動力參數(shù)計算 ........................................... 5 總傳動比和傳動比分配計算 .................................................... 5 各軸轉(zhuǎn)速計算 ............................................................................. 5 各軸輸入功率計算 .................................................................... 6 各軸轉(zhuǎn)矩計算 ............................................................................ 6 第 3 章 齒輪強(qiáng)度校核及結(jié)構(gòu)設(shè)計 ....................................................... 8 齒輪的類型、精度等級、材料及齒數(shù)的選定 ....................... 8 材料的選擇 ....................................................................... 8 齒數(shù)的選定 ....................................................................... 8 按 齒面 接觸強(qiáng)度設(shè)計 ............................................................... 8 計算公式及參數(shù) .................................................................... 8 設(shè)計計算 ......................................................................... 10 按齒根彎曲強(qiáng)度設(shè)計 ...............................................................11 計算公式及參數(shù)的選定 .................................................11 設(shè)計計算 ......................................................................... 13 幾何尺寸計算 ........................................................................... 14 齒輪的結(jié)構(gòu)設(shè)計 ....................................................................... 14 第 4 章 軸的設(shè)計及校核 ...................................................................... 17 初步確定軸的最小直徑 .......................................................... 17 軸的結(jié)構(gòu)設(shè)計 ........................................................................... 17 擬定軸上零件的裝配方案 ........................................... 17 根據(jù)軸向定位的要求確定軸的各段直徑和長度 ............. 17 軸上零件的周向定位 .......................................................... 19 確定軸上圓角和倒角尺寸 .................................................. 19 求軸上的載荷 .......................................................................... 19 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） IV 中間軸的校核 ............................................................... 19 繪制轉(zhuǎn)矩圖、彎矩圖 ................................................... 22 按彎扭合成應(yīng)力校核軸的強(qiáng)度 ............................................. 23 精確校核軸的疲勞強(qiáng)度 ......................................................... 24 判斷危險截面 ............................................................... 24 設(shè)計校核參數(shù)的確定及計算 .............................................. 24 第 5 章 軸承壽命的 驗算 ...................................................................... 27 結(jié) 論 ..................................................................................................... 28 謝 辭 ....................................................................................................... 29 參考文獻(xiàn) ................................................................................................. 30 洛陽理工學(xué)院畢業(yè)設(shè)計（論文） 1 前 言 在現(xiàn)實(shí)中，車輛與我們的時候息息相關(guān)，它對人們生活質(zhì)量的提高和國民經(jīng)濟(jì)的發(fā)展起著重要的作用。 這項設(shè)計按照設(shè)計說明書的要求，采用最新的參考資料來確保設(shè)計的先進(jìn)性和科學(xué)性。洛陽理工學(xué)院畢業(yè)設(shè)計（論文） I 工程車輛傳動系統(tǒng)分動箱的設(shè)計 摘 要 變速器把發(fā)動機(jī)的高輸出轉(zhuǎn)速降下來，以滿足車輛的行駛需要。本設(shè)計主要對分動箱的工作情況進(jìn)行了概述，對 傳動裝置的運(yùn)動和動力參數(shù) 進(jìn)行了選擇和 計算 ，對 齒輪 進(jìn)行了 強(qiáng)度 的 校核及結(jié)構(gòu) 的 設(shè)計 ，對 軸 進(jìn)行了設(shè)計與 校核 ，對軸承壽命進(jìn)行了驗算。而低速工程車輛在經(jīng)濟(jì)建設(shè)中起著不可估量的作用。而假如這輛車的四個輪子都能產(chǎn)生驅(qū)動力的話，那么，還有兩個沒陷入溝中的車輪能正常工作， 使車輛繼續(xù)行駛。分動器也是一個齒輪傳動系統(tǒng)，它單獨(dú)固定在車架上，其輸入軸與變速器的輸出軸用萬向傳動裝置連接，分動器的輸出軸有若干根，分別經(jīng) 萬向傳動裝置與各驅(qū)動橋相連。這個優(yōu)點(diǎn)可以幫助應(yīng)對各種環(huán)境 ： 1. 松軟土 地： 車輛 通過 該 地 面 時需要很大的力。 2. 越過 較滑的 路面 ：執(zhí)行這一任務(wù)需要很大的牽引力。 洛陽理工學(xué)院畢業(yè)設(shè)計（論文）