17毕业设计_汽车_转向系统[2]

广东工业大学汽车前轮转向系统的设计摘要本设计课题为汽车前轮转向系统的设计，课题以机械式转向系统的齿轮齿条式转向器设计及校核、整体式转向梯形机构的设计及验算为中心。首先对汽车转向系进行概述，二是作设计前期数据准备，三是转向器形式的选择以及初定各个参数，四是对齿轮齿条式转向器的主要部件进行受力分析与数据校核，五是对整体式转向梯形机构的设计以及验算，并根据梯形数据对转向传动机构作尺寸设计。在转向梯形机构设计方面。运用了优化计算工具Matlab进行设计及验算。Matlab强大的计算功能以及简单的程序语法，使设计在参数变更时得到快捷而可靠的数据分析和直观的二维曲线图。最后设计中运用AutoCAD和CATIA作出齿轮齿条式转向器的零件图以及装配图。关键词：转向机构，齿轮齿条，整体式转向梯形，Matlab梯形广东工业大学汽车前轮转向系统的设计AbstractThetitleofthistopicisthedesignofsteeringsystem.RackandpinionsteeringofMechanicalsteeringsystemandintegratedSteeringtrapezoidmechanismgeartothedesignasthecenter.FirstlymakeanoverviewoftheSteeringSystem.Secondlytakeapreparationofthedataofthedesign.Thirdly,makeachoiceofthesteeringformanddeterminetheprimaryparametersanddesignthestructureofRackandpinionsteering.Fourthly,StressanalysisanddatacheckingoftheRackandpinionsteering.Fifthly,designofSteeringtrapezoidmechanism,accordingtothetrapezoidaldatamakeananalysisanddesignofSteeringlinkage.InthedesignofintegratedSteeringtrapezoidmechanismthecomputationaltoolsMatlabhadbeenusedtoDesignandCheckingofthedata.ThepowerfulcomputingandIntuitivechartsoftheMatlabcangiveusAccurateandquicklydata.IntheendAutoCADandCATIAwereusedtomakearackandpinionsteeringpartsdiagramsandassemblydrawingsKeywords:Steeringsystem，MechanicalTypeSteeringGearandGearRack，IntegratedSteeringtrapezoid，MatlabTrapezoid广东工业大学汽车前轮转向系统的设计目录1绪论........................................................................................................................................11.1汽车转向系统概述......................................................................................................11.2汽车转向系统的国内外现状及发展趋势..................................................................21.3研究内容及论文构成..................................................................................................32机械转向系统的性能要求及参数........................................................................................52.1机械转向系统的结构组成..........................................................................................52.2转向系统的性能要求..................................................................................................62.3转向系的效率..............................................................................................................72.4传动比特性..................................................................................................................92.5转向器传动副的传动间隙........................................................................................113机械式转向器总体方案初步设计......................................................................................123.1转向器的分类及设计选择........................................................................................123.2齿轮齿条式转向器的基本设计................................................................................123.2.1齿轮齿条式转向器的结构选择......................................................................123.2.2齿轮齿条式转向器的布置形式......................................................................143.2.3设计目标参数表以及对应的转向轮偏角计算..............................................153.2.4转向器参数选取与计算..................................................................................163.2.5齿轮轴的结构设计..........................................................................................193.2.6转向器材料及其他零件选择..........................................................................204齿轮齿条转向器校核..........................................................................................................214.1齿条的强度计算........................................................................................................214.1.1齿条受力分析..................................................................................................214.1.2齿条齿根弯曲强度的计算..............................................................................224.2小齿轮的强度计算....................................................................................................234.2.1齿面接触疲劳强度计算..................................................................................23广东工业大学汽车前轮转向系统的设计4.2.2齿轮齿根弯曲疲劳强度计算..........................................................................264.3齿轮轴强度校核.......................................................................................................275转向梯形机构的设计..........................................................................................................315.1转向梯形机构概述....................................................................................................315.2整体式转向梯形机构方案分析................................................................................325.3整体式转向梯形机构数学模型分析........................................................................325.4基于Matlab的整体式转向梯形机构优化设计.......................................................355.4.1转向梯形机构的优化概况..............................................................................355.4.2转向梯形机构设计思路..................................................................................365.4.3基于Matlab的转向梯形机构设计.................................................................365.5转向传动机构的设计........................