【正文】 for engine gear By the pro/e , the 3d model of gear is established .In the pro/e , the method of creating standard gear by drawing involute ways is quite plex. ? The calculation of bending stress by FEM. Import the three dimensional finite element model of involute gear to the Software of ansys , and then make a simplification to the model and boundary conditions . Calculate several points of gear contact in the athletic and constraint the gear . Load resistance in the gear and analysis the change of bending stress of gear engagement during the limit condition. ? The theoretical calculation of bending stress. According to the theory of mechanical design , use the national standard method to calculate the bending stress of the theoretical value. Then pare with the finite element calculation result. Through the work of above three aspects ,a set of effective method for gear design and analysis is provided . Compared with the traditional calculation method, the finite element analysis method has the rapid and effective advantages. Keywords: engine gear , finite element analysis, bending stress, theoretical calculation 7 目錄 第一章 緒論 ............................................................................ 1 第一節(jié) 引言 ........................................................................ 1 第二節(jié) 齒輪接觸應(yīng)力研究歷史和現(xiàn)狀 .................................................. 1 第三節(jié) 齒輪 CAD/CAE的研究現(xiàn)狀 ....................................................... 1 第四節(jié) 有限元方法概述 .............................................................. 1 第五節(jié) ANSYS的主要功能 ............................................................. 2 第二章 發(fā)動機齒輪的三維建模 ............................................................ 4 第一節(jié) 幾何建模技術(shù) ................................................................ 4 第二節(jié) 齒輪三維模型建立 ............................................................ 5 一、 創(chuàng)建漸開線 ................................................................ 5 二、 創(chuàng)建出一個齒廓 ............................................................ 8 三、 創(chuàng)建齒根過渡曲線 .......................................................... 9 四、 計算齒寬并對 2D草圖進行拉伸 ................................................ 9 五、 對輪齒進 行陣列從而創(chuàng)建出完整的齒輪 ....................................... 11 第三章 齒輪靜態(tài)接觸應(yīng)力有限元計算 ..................................................... 14 第一節(jié) 齒輪傳動的失效形式及設(shè)計準則 ............................................... 14 一、 失效形式 ................................................................. 14 二、 設(shè)計準則 ................................................................. 16 第二節(jié) 靜力學分析基礎(chǔ) ............................................................. 16 一、 結(jié)構(gòu)靜力學分析簡介 ....................................................... 16 二、 AWE靜力學分析基本過程 .................................................... 17 第三節(jié) 三維齒輪模型接觸應(yīng)力分析 ................................................... 17 一、 模型的簡化 ............................................................... 17 二、 導入模型到 ANSYS并添加材料信息 ............................................ 18 三、 網(wǎng)格劃分 ................................................................. 19 四、 設(shè)置邊界條件 ............................................................. 21 五、 分析 求解 ................................................................. 24 六、 求解并觀察結(jié)果 ........................................................... 26 第四節(jié) 分析結(jié)果概述 ............................................................... 27 一、 總變形云圖 ............................................................... 27 二、 應(yīng)力奇異 ................................................................. 27 三、 齒根圓角半徑大小對齒根處應(yīng)力的影響 ....................................... 28 第五章 結(jié)論與展望 ..................................................................... 38 第一節(jié) 結(jié)論 ....................................................................... 38 第二節(jié) 展望 .............................