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ID:40502105
大小:21.83 KB
页数:4页
时间:2019-08-03
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1、1.1Supposethat,toaccomplishthespeedreduction,youdecideadouble-reduction,spurgearspeedreducer.Youspecifyfourgears,threeshafts,sixbearings,andahousingtoholdtheindividualelementsinproperrelationtoeachother.假如要完成一个两级直齿圆柱齿轮减速器的设计,确定有四个齿轮、三根轴、六个轴承和容纳这些零件并使它们彼此之间保持它们正确位置关系的箱体。1.2Eachofthethrees
2、haftsissupportedbyballbearings,makingthemstaticallydeterminateandallowinganalysisofforcesandstressesusingstandardprinciplesofmechanics.三根轴中的每根轴都由一对球轴承支承固定,使其静态稳定可运用力学原理来进行载荷和应力分析1.3Theinputandoutputshaftswillextendbeyondthehousingtopermitcouplingwiththeengineandthedriveaxle.输入轴和输出轴要延伸至箱体
3、外来与发动机和驱动轴相连。2.1Thedrivingteethpushonthedriventeethexertingaforceperpendiculartotheradiusofthegear.主动轮齿推动从动轮齿,在垂直于齿轮半径方向上施加作用力。2.2Fromthemomentofinitialcontacttothemomentofdisengagement,thespeedofthedrivinggearisinaconstantproportiontothespeedofthedrivengear.从最初接触一直到分开,主动轮的速度与从动轮的速度的比值是恒
4、定的。2.3Theparallelshaftarrangementforhelicalgearsisbecauseitresultsinamuchhigherpower-transmittingcapacityforagivensizeofgearthanthecrossedhelicalarrangement.对于斜齿轮来说,应优先选用平行轴安装方式,因为对于同样尺寸的齿轮而言,平行轴安装方式比交错轴斜齿轮安装方式传递效率高很多。3.1Akeyisthemachinerycomponentplacedattheinterfacebetweenashaftandhubo
5、fapower-transmittingelementforthepurposetransmittingtorque.键是安装在轴和轮毂结合处的机械零件,作用是传递扭矩和动力。3.2Theloadpathisthenfromthedrivingshafttoitsflange,throughthebolts,intothematingflange,andouttothedrivenshaft.载荷从主动轴加载到法兰上,然后通过螺栓加载到与之配合的另一个法兰上,在传递给从动轴。3.3Flexiblecouplingsaredesignedtotransmittorques
6、moothlywhilepermittingsomeaxial,radial,andangularmisalignment.Theflexibilitysuchthatwhenmisalignmentdoesoccur,partsofthecouplingmovewithlittleornoresistance.柔性联轴器设计要求平滑地传递扭矩,允许少许的轴向、径向和角度误差。因为存在柔性,当误差发生时联轴器中的零件可在微小的甚至无阻力下移动校正。4.1Thetermrollingcontactbearingsreferstothewidevarietyofbearin
7、gsthatusesphericalballsorsomeothertypeofrollerbetweenthestationaryandthemovingelements.滚动接触轴承指的是在固定和运动零件之间使用球轴承或者其他类型滚动体的大类轴承4.2Usuallytheouterraceisstationaryandisheldbythehousingofthemachine.Theinnerraceispressedontotherotatingshaftandthusrotateswithit.通常外圈固定在结构的箱体孔内,内圈
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