摘要变速箱是一种封闭在刚性壳体内的独立传动装置。其功能是用来降低转速、增大转矩、把原动机的运动和传给工作机。减速器结构紧凑、效率较高、传递运动准确可靠、使用用维修省事、可以成批量的生产、因此应用的十分广泛。本课题减速器主要由传动件、轴、轴承和箱体四部分组成，其传动件有采用直齿轮传动。箱体采用中等强度的铸铁铸造而成。为省事安装，箱体制成剖分式，剖分面与轴线平行且重合。关键词：直齿圆锥齿轮，变速箱，设计，CAD。ABSTRACTAreducerisanindependenttransmissiondeviceenclosedinarigidshell.Itsfunctionistoreducerotationspeed,increasetorque,andpassthemotionofprimemoverontotheworkstation.Reducersarecompactandefficient.Movementtransmissionisdependableandaccurate.Reducersareeasytouseandrepair.Adaptabletomassproduction,socanbeusedforawiderangeofapplications.Inthisstudyreducersarecomposedprimarilyofthetransmissiondevice,axle,bearingandcasing.Thetransmissiondeviceutilizesdirectgeardrive.Thecasingiscastwithmediumstrengthcastiron.Tofacilitateinstallation,thecasingismadesplitmechanicalstyle,withthedivisionparallelandcoincidingwiththeaxis.Keywords:Straightbevelgear,gearbox,design,CAD.目录绪论········································································································11.直齿圆锥齿轮变速箱的工作原理·····························································12.设计任务书···························································································13.电机的选择计算·····················································································13.1择电机的转速·····················································································13.2工作机的有效功率···············································································23.3选择电动机的型号···············································································24.运动和动力参数的计算·············································································34.1分配传动比························································································34.2各轴的转速························································································34.3各轴的功率························································································34.4各轴的转矩··········