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1、重型自卸车倾卸机构CAD设计摘要随着CAD/CAE技术的逐步推广与普及,虚拟样机技术综合了许多先进的方法和技术,具有缩短产品开发周期、降低生产成本、提高企业效率等优点,CATIA是一套博大精深的三维CAD/CAE参数化软件系统,在汽车设计中正发挥着越来越重要的作用。本文以SL3360Z型自卸车为对象,对其倾卸机构进行了设计,本设计采用前推三角臂组合式(或称马勒里式)倾卸机构。该机构主要包括三角臂、拉杆、液压缸等零部件。设计中主要根据SL3360Z型自卸车主要技术参数,通过作图法和经验公式,初步确定倾卸机构的主要零件尺寸和安装位置,并对其进行受力分析,根据受力分析结果,运用经验公式
2、确定各零件的截面尺寸,设计倾卸机构的液压缸,对液压泵等元件进行选型。为保证机构的使用安全性、可靠性,利用力学理论对倾卸机构的主要部件进行了强度校核、稳定性校核。依据自卸车主要技术参数和倾卸机构主要尺寸及安装位置,利用CATIA软件进行了整车建模,同时对主要部件进行了有限元分析,验证了倾卸机构具有良好的强度和刚度,并对三角臂进行了适当的优化,优化结果不仅符合设计要求,而且降低了成本。最后运用CATIA的数字模型模块进行倾卸过程的运动仿真分析,生成仿真曲线,验证倾卸机构的最大举升角达到了设计要求。关键词 CAD/CAE;自卸车;倾卸机构;CATIA-V-CADDESIGNONTIPP
3、INGMECHANISMOFTHEHEAVYDUMPTRUCKAbstractAlongwithCAD/CAEtechnologygraduallypromotionandpopularization,dummyspecimentechnologyhassynthesizedmanyadvancedmethodsandthetechnology,anditcanreducetheproductdevelopmentcycle,debasethecost,improveefficiencyandsoon,CATIAisasetofbroadandprofoundthreedimen
4、sionalCAD/CAEparametrizationsoftwaresystem,whichhasbeenplayingthemoreandmorevitalroleintheautomobiledesign.ThedumptruckofSL3360Zistakenasanobjectinthispaper,andcarriesonthedesigntoitsdumpingmechanism,Thisdesignusesthepushofthetrianglearmcombinedtype(orcalledtheMallerytype)asthedumpingmechanis
5、m.Thisdumpingmechanismmainlyincludestrianglearm,tensionbar,hydrauliccylinderandsoon.AccordingtothemajortechniqueparameterofSL3360Zdumptruck,thisdesignusesconstructionandempiricalformulatomakesurethepreliminarydumpingmechanism'smajorpartslengthsizeandthepositionoftheinstallation,andcarriesonth
6、estressanalysistothemajorparts.Dependingonthestressanalysisresult,thesectionsizeisdeterminedbytheempiricalformula,thehydrauliccylinderofdumpingmechanismisdesigned,theotherpartsofhydraulicsystemareselected.Inordertoguaranteemechanism'soperationalsafetyandreliability,themaincomponentsarecarried
7、ontheirintensityexaminationandstableexaminationusingthetheoryofmechanics.Accordingtothemajortechniqueparameter,themodelofthedumptruckismadebytheCATIAsoftware,meanwhileFiniteElementAnalysisisusedtothe-V-maincomponents,whichconfirmsthedumpingme