基于CATIA的双级主减速器设计与CAE分析

本科毕业设计题目：基于的双级主减速器设计与分析CATIACAE学院:汽车与交通工程学院专业:车辆工程200923179005学号:学生姓名:指导教师:日期:二〇一三年六月武汉科技大学本科毕业设计I摘要主减速器是汽车传动系的一个重要组成部分，它的质量在一定程度上影响着整个汽车的质量。因此，在设计时应在结构合理的基础上，进一步优化使其结构紧凑、效率高，同时还要考虑其经济性。本设计用与相结合的方法对一减速比较大且轴距较长的中型货车设计了一个结构合理且经济性适中的双级主减速器。在设计过程中，首先对该主减速器的传动件进行尺寸计算和校核。为节省计算时间及提高计算精度，在对复杂的准双曲面齿轮副的尺寸计算时使用了MAT代码进行计算。对主减速器零部件进行CATI时，齿轮的建模都采用了参数化建模的方式。本设计还用CATE模块对第一级齿轮传动副进行了静态应力分析，以校核其强度是否满足要求。对第一级齿轮传动副进行分析后发现，从动准双曲面齿轮与主动斜齿圆柱齿轮的铆钉连接处应力集中比较大，最大应力甚至超过了材料的许用弯曲应力值。经仔细分析后，对应力集中处进行结构改进，然后再进行分析计算，结果显示最大应力值下降至安全范围内，并明显改善了分析对象的应力状况。关键词：双级主减速器；驱动桥；载货汽车；CADCAELAB编辑A建模IA的CA分析CAECATIA；CAE；武汉科技大学本科毕业设计IIAbstractThemainreducerisanimportantpartoftheautomobiledrivetrain.Toacertainextent,itsqualityaffectsthequalityofthewholecar.Thereforewhendesign,themainreducershouldbeoptimizedtobecompactandefficient.Thecostofthemainreducershallbetakenintoconsiderationtoo.Inthisdesign,areasonableandeconomicaldoublemainreducerwasdesignedforamediumtruckwithbigreductionratioandlongwheelbaseusingbyCAD/CAEmethod.Thesizecalculationandcheckingworkwasputinthefirstplace.Inordertosavecomputationtimeandimprovecalculationaccuracy,MATLABwasusedinthecomplexcalculationofhypoidgearpair.CATIAwasusedasgearparametricmodelingwhenmodelingformainreducer’sparts.Thestaticstressanalysisforthefirstleveltransmissionvicewasfinishedtocheckthestrengthofthepartswhethermeettherequirements.Afterthestaticanalysisforthefirstleveltransmissionviceanditwasfoundthatthestressconcentrationoftherivetjointbetweendrivenhypoidgearanddrivehelicalcylindricalgearwaslargerandthemaximumstresswasevenhigherthanthematerialallowablebendingstress.Thenastructureimprovementwasmadeforthestressconcentrationplace.Keywords:Doublemainreducer;Driveaxle;Truck;CATIA;CAE武汉科技大学本科毕业设计目录前差速器的基本参数选择及尺寸计算锥齿轮副齿宽的选择主动锥齿轮中点螺旋角1m言········································································································································1 1主减速器设计方案的选择··································································································2 1.1双级主减速器概述····································································································2 1.2双级主减速器结构设计方案的选择·········································································4 1.3设计主要内容············································································································5 1.3.1双级主减速器的结构设计及校核···································································5 1.3.2································································5 1.3.3双级主减速器及差速器的三维建模·······························································5 2主减速器结构设计及校核··································································································6 2.1主减速比的分配········································································································6 2.2主减速齿轮计算载荷的确定·····················································································6 2.3第一级准双曲面锥齿轮副基本参数的选择·····························································8 2.3.1齿数的选择······································································································8 2.3.2从动锥齿轮节圆直径的选择···········································································8 2.3.3从动锥齿轮大端端面模数的选择···································································8 2.3.4·······················································································9 2.3.5准双曲面齿轮的偏移距E················································································9 2.3.6准双曲面锥齿轮的螺旋方向与偏移方向·······················································9 2.3.7的选择································································9 β2.3.8III准双曲面锥齿轮平均法向压力角α的选择刀盘名义半径0r的选择单位齿长上的圆周力轮齿弯曲强度的校核轮齿接触强度的校核按齿面接触强度设计按齿根弯曲强度设计·················································10 2.3.9·················································································10 2.4第一级准双曲面锥齿轮副的几何尺寸计算···························································10 2.5第一级准双曲面锥齿轮副的强度校核···································································12 2.5.1·····················································································12 2.5.2·····················································································12 2.5.3·····················································································13 2.6第一级准双曲面锥齿轮副的材料选择···································································15 2.6.1对驱动桥齿轮材料及热处理的要求·····························································15 2.6.2准双曲面齿轮副的材料选择·········································································15 2.7第二级斜齿圆柱齿轮副模数的确定·······································································15 2.7.1齿轮精度等级、材料及齿数的选择·····························································15 2.7.2·····················································································16 2.7.3·····················································································17 2.8第二级斜齿圆柱齿轮副的几何尺寸计算··························································