循环球式汽车方向机的总体设计及关键零部件的设计专业机械设计制造及其自动化学生赵云甫指导教师赵武教授【摘要】自从1928年液压助力转向器研制成功以来，液压助力的循环球式转向器便得到广泛的应用。本文首先从转向器的历史、分类和发展等概念入手，引出本课题所要研究的对象循环球式转向器。进而对循环球式转向器结构特点、设计要求和作用原理进行简单的介绍。然后讲述了螺杆螺母传动副的设计、齿条齿扇传动副的设计、转阀和箱体的设计，重点讲述了转向螺杆的设计。然后对设计出来的转向器进行强度校核，主要是钢珠与滚道的接触应力、齿扇的弯曲应力和摇臂轴直径的确定。最后用三维造型软件Catia绘制转向器的总成图和装配图，至于二维的工程图就应用专业的计算机辅助绘图和设计软件—Auto/CAD进行绘制创建Recirculatingballsteeringoftheoverallvehicledesignandthedesignofkeycomponents【Abstract】Since1928,sincethesuccessfuldevelopmentofhydraulicpowersteering,hydraulicpoweroftherecirculatingballsteeringhasbeenwidelyused.Firstly,fromthesteeringgearofthehistory,classificationanddevelopmentconcept,leadstothetopicoftheobjecttoberecirculatingballsteering.Turnontherecirculatingballsteeringstructure,designrequirementsandprinciplesforabriefrole.Thentellsthedrivescrewnutvicedesign,fandrivegearrackpairsdesign,thedesignofrotaryvalveandbox,highlighttheshiftscrewdesign.Thenoutofthesteeringofthedesignstrengthcheck,mainlysteelballandtheracewaycontactstress,bendingstressandtoothfanrockershaftdiameterdetermined.Finally,three-dimensionalmodelingsoftwareCatiadrawingsteeringgearassemblyandassemblydrawings,Asforthetwo-dimensionaldrawingstotheapplicationofprofessionalcomputer-aideddraftinganddesignsoftwaretodraw-Auto/CADcreated.Keywords:steeringgear,hydraulicpower,recirculatingballtype,rotaryvalve,screw.目录第一章绪论.............................................................................................51.1概述...............................................51.2转向器的历史.......................................51.3转向器的分类.......................................61.3.1机械式转向器...........................................61.3.2液压助力转向器.........................................61.3.3电动助力转向器........................................71.3.4电控液压助力转向器....................................71.3.5线控转向器............................................71.4转向器的发展现状及展望.............................71.5本课题研究内容及意义...............................81.6本章小结...........................................8第二章循环球式转向器...........................................................................92.1循环球式转向器的结构特点...........................92.2循环球式液压助力转向器设计要求....................92.3循环球式液压助力转向器的作用原理..................102.4本章小结.........................................12第三章循环球式转向器的总体设计及螺杆的设计..........................133.1转向器计算载荷的确定..............................133.2螺杆、钢珠和螺母传动副的设计......................143.2.1初选螺杆外径和螺母内径................................143.2.2螺杆的设计............................................143.2.2钢球中心距D的确定....................................163.2.3钢球的直径d和数量n..................................163.2.4钢珠滚道截面..........................................173.2.5螺距t和螺纹导程角....................................183.2.6导管内径..............................................183.2.7材料的选取............
