轴承寿命计算例
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
图示的轴由一对7206AC角接触球轴承支承。已知轴的转速n=1000r/min,齿轮分度圆直径d=80mm,圆周力F=2000N,径向力F=800N,轴向力F=500N,载荷平稳。求:trae1.轴承1、2所受的径向载荷F、F?r1r22.轴承1、2所受的轴向载荷F、F?a1a23.轴承1、2的寿命?(附录数据:轴承派生轴向力F=0.68F,F=0.68F;额定动载荷C=17.1KN;界限系d1r1d2r2FF数e=0.68;若a≤e,取X=1,Y=0;若a>e,取X=0.41,Y=0.87)FFRR解:1.求两轴承受到的径向载荷水平支反力如图a)所示。F=Ft/2=1000N,F=Ft/2=1000Nr1Hr2H垂直支反力如图b)所示。因F×100+Fae×80/2-Fr×50=0r1V则F=(800×50-500×40)/100=200Nr1V因F×100-Fae×80/2-Fr×50=0r2V则F=(800×50+500×40)/100=600Nr2V总支反力:F=(F2+F2)1/2=1019.8Nr1rⅠHrⅠVFtF=(F2+F2)1/2=1166.2Na)r2rⅡHrⅡV2.求两轴承受到的轴向载荷FFF0.68F0.681019.8693.5Nr1Hr2Hd1r1F0.68F0.681166.2793.NFtd2r2FFF693.55001193.5NFaed1aed2F轴有向右窜动趋势,故轴承1被放松,轴承2被压紧rFF693.5Nb)a1d1FFF500693.51193.5NFFa2aed1r1Vr2V3.求轴承受到的当量动载荷c)FaeFFF693.5d1d2a10.68e,取X1,Y0F1019.811r1F1193.5,取a21.11eX0.41,Y0.87F1166.222r2PfXFYF1.011019.801019.8N1P1r11a1PfXFYF1.00.411166.20.871193.51516.5N2P2r22a24.按轴承2计算轴承寿命106fC31061.0171003Lt23895hh60nP6010001516.51/2