汽车循环球式转向器设计.doc

汽车循环球式转向器设计摘要循环球式转向器是由螺杆和螺母共同形成的螺旋槽内装钢球构成的传动副，以及螺母上齿条与摇臂轴上齿扇构成的传动副总成。循环球式转向器的优点是：在螺杆与螺母之间因为有可以循环流动的钢球，将滑动摩擦转变为滚动摩擦，因而传动效率可达到75%~85%；在结构和工艺上采取措施后，包括提高制造精度，改善工作表面的表面粗糙度，螺杆和螺母上的螺旋槽经淬火和磨削加工，使之有足够的硬度和耐磨损性能，可保证有足够的使用寿命；转向器的传动比可以变化；工作平稳可靠；齿条和齿扇之间的间隙调整工作容易进行；适合来做整体式动力转向器。本文的主要内容即是设计一款机械式循环球式转向器。通过查阅相关文献资料，进行循环球式转向器的尺寸的设计计算与强度校核，然后进行循环球式转向器的三维CATIA建模，最后绘制转向器的二维装配图及其重要零件的零件图。关键词：循环球式转向器；三维建模；螺杆螺母传动副CirculatingBallTypeSteeringoftheVehicleDesignAbstractCirculatingballtypesteeringgearisformedbythescrewandnutofthespiralgrooveballinsidethetransmission,vice,andthenutontherackandconstituteoftherockerarmshaftgearfandriveassembly.Theadvantageofcirculatingballtypesteeringgear:Betweenthescrewandnutbecauseofcirculatingball,changetheslidingfrictiontorollingfriction,sotransmissionefficiencycanreach75%~85%;Onthestructureandprocessmeasures,includingimprovethemanufacturingaccuracy,andimprovethesurfaceroughnessoftheworksurface,thespiralgrooveonthescrewandnutforquenchingandgrinding.Makeithasenoughhardnessandwearresistance,toensureadequateservicelife;Steeringgearratiocanchange;Stableandreliable;Rackandgearclearancebetweenfanadjustmentworkeasily;Suitableforintegratedpowersteering.Themaincontentofthistitleistodesignamechanicalcirculatingballtypesteeringgear.Throughconsultingrelevantliterature,todesignandcalculationofthesizeofthecirculatingballtypesteeringgearandstrengthcheck.Thenthecirculatingballtypesteeringgearthree-dimensionalmodelingusingCATIA.Finallydrawtheredirectorassemblydrawingandpartdrawingofimportantparts.Keywords:Circulatingballtypesteeringgear;3dmodeling;Thescrewandnutcombination目录TOC\o"1-3"\h\uHYPERLINK\l_Toc6341摘要PAGEREF_Toc63411HYPERLINK\l_Toc11907AbstractPAGEREF_Toc119071HYPERLINK\l_Toc10790第1章绪论PAGEREF_Toc107901HYPERLINK\l_Toc261971.1课题背景PAGEREF_Toc261971HYPERLINK\l_Toc131701.2国内外研究现状PAGEREF_Toc131702HYPERLINK\l_Toc231151.3研究的目的及意义PAGEREF_Toc231153HYPERLINK\l_Toc168041.4研究内容和设计方法PAGEREF_Toc168044HYPERLINK\l_Toc9375第2章转向器的设计PAGEREF_To