推力球轴承设计方法.doc

推力球轴承设计方法一 、推力球轴承优化设计 1.1外形尺寸单向推力球轴承外形尺寸d、D、T、d1smin、D1smax、轴圈和座圈最小装配倒角rsmin及双向推力球轴承外形尺寸d2、D、T1、d1smin、D2smax、B、座圈最小装配倒角rsmin、中轴圈最小装配倒角r1smin应符合GB/T301-1995、 GB301-87的规定。1.2主参数优化设计双向推力球轴承的钢球直径Dw钢球组的中心圆直径DwP应与相应型号的单向轴承相同,双向推力球轴承的钢球数应为单向轴承的2倍。1.2a目标函数优化设计以轴承轴向基本额定动载荷Ca为目标函数, 根据GB/T6391-1995的规定。(1) 单列轴承若Dw25.4 , =90 Ca=bm*fc*Z 2/3 *Dw1.8若Dw25.4 , 90 Ca=bm*fc(COS)0.7*tan*Z 2/3 * Dw1.8若Dw25.4 , =90 Ca=3.647*bm*fc*Z 2/3 *Dw1.4若Dw25.4 , 90 Ca=3.647*bm*fc(COS)0.7*tan*Z 2/3 * Dw1.4Z为钢球数 bm=1.3 fc值见列表(2) 双列轴承或多列轴承Ca=(Z1+Z2+ +Zn) (Z1/Ca1)10/3+( Z2/Ca2)10/3+ +( Zn/Can)10/3-3/10Ca1、Ca2、 Can按单列轴承的公式计算1.2b 轴向当量动载荷Pa (N)90的推力球轴承，轴向当量动载荷 Pa=XFrYFa=90的推力球轴承，轴向当量动载荷 Pa=Fa1.2c 推力球轴承的基本额定寿命 L10 单位106转L10 = (Ca/Pa)3 当Pa超过0.5 Ca时，注意使用公式载荷过重滚道产生有害的塑性变形影响寿命。推力球轴承的X和Y值单向轴承双向轴承eFa/FreFa/FreFa/FreXYXYXY455055606570758085900.660.730.810.921.061.281.662.434.81.25tan(12/3sin)11.181.371.61.92.32.93.895.8611.7520/13tan(1 (11/3sin)0.590.570.560.550.540.530.520.520.5110/13tan(1(11/3sin)0.660.730.810.921.061.281.662.434.81.25tan(1-2/3sin)11.251.491.792.172.683.434.677.0914.291.25tan注：的中间值，由X、Y、e的线性内插法求得。推力球轴承的fc值DwDpwfcDwcosDpwfc=90=45=60=750.010.020.030.040.050.060.070.080.0936.745.251.155.759.562.965.868.5710.010.020.030.040.050.060.070.080.0942.151.758.263.367.370.773.575.97839.248.154.258.962.665.868.470.772.637.345.951.756.159.762.765.267.369.20.10.110.120.130.140.150.160.170.180.1973.375.477.479.381.182.784.485.987.488.80.10.110.120.130.140.150.160.170.180.1979.781.182.383.384.184.785.185.485.585.574.275.576.677.578.378.879.279.579.679.670.70.20.210.220.230.240.250.260.270.280.2990.291.592.894.195.396.497.698.799.8100.80.20.210.220.230.240.250.260.270.280.290.385.485.284.984.58483.482.88281.380.479.679.50.30.310.320.330.340.35101.9102.9103.9104.8105.8106.7注：fc的值，可由线性内插法求得。1.2c 轴承轴向静载荷Coa (N) Coa49ZDw2sin (GB466284) Coaf0ZDw2sin 90时，f061.6 (GB/T466293)Z为一个方向承受载荷的球数1.2d 轴向最小载荷Famin (N)当推力球轴承转速较高时，由于钢球的自转轴绕公转轴旋转的方向发生变化,因而在钢球上产生陀螺力矩作用，钢球在滚道上可能滑动。使钢球于滚道接触压力不低于一定程度，以防滑动。FaminM（Nmax）2 Nmax为轴承最高转速，M为最小载荷系数M5.6510-5ZDw3Dwp2.1 约束条件(1) 球径Dw的约束Kwmin(D1smaxd1smin)DwKwmax(D1smaxd1smin)为了适用于双向推力球轴承，应进行验算：g2 = (B+T+Dw-T1)/20.08Dwg20.125Dw 52200系列0.08Dwg20.135Dw 52300、52400系列(2) 钢球组的中心圆直径DwP的约