1、标准链轮的尺寸P：节距，R：滚子直径 ，N：链轮的齿数节距直径 PCD = P/(sin180/N)外径 OD = P/(0.6+cot180/N)下表给出一种标准节距链轮的节距直径和外径(节距 1)。例：为了得到 120 号 NT(齿数)25 链轮的节径和外径从表中可得到节距为 7.9789。因此PCD=38.17.9789=303.98847，或者取小数点后 1 位并四舍五入 303.99。外径可从表中查得为 8.516。因此 OD=38.108.516=324.4596，或取小数点后 1 位并四舍五入 324。齿根圆直径 BD=PCDR最大齿根距离(卡钳测量)：CD对于奇数齿：CD=PC
2、Dcos90/NR对于偶数齿：CD=BD节距直径系数和外径系数清单 (mm)齿数系数1/sin(180/N)系数0.6+cot(180/N)齿数系数1/sin(180/N)系数016+cot(180/N)齿数系数1/sin(180/N)系数0.6+cot(180/N)111213141516171819202l2223242526273.54953.86374.17864.49404.80975.12585.44225.75886.07556.39256.70957.02677.34397.66137.97878.29628.61384.0064.3324.6574.9815.3055.627
3、5 9506.2716 5936 9147.2357.5557 8768 1968.5168.8369.156525253545556575859606162636465666716.244116.562216.880317.198417.516617.834718.152918.471018.789219.107319.425519.743720.061820.380020.698221.016421.234916.81317.13217.45117.76918.08818.40718.72519.04419.36319.68120.00020.31820.63720.95521.27421
4、.59321.91191929394959697989910010110210310410510610728.972029.290229.608529.926730.244930.563230.881531.199731.518031.836232.154532.472732.791033.109333.427533.745834.064129.29029.87330.19230.51030.82831.14731.46531.78432.10232.42132.73933.05733.37633.69434.01334.33134.694282930313233343536373839404
5、14243444546474849508.93149.24919.56689.884510.202310.520110.838011.155811.473711.791612.109612.427512.745513.063513.381513.699514.017514.335614.653614.971715.289815.607915.92609.4759.79510.11410.43410.75311.07211.39211.71112.03012.34912.66812.98713.30613.62513.94414.36314.58214 90115.21915.53815.857
6、16.17616.495686970717273747576777879808182838485868788899021.652821.971022.289222.607422.925623.243823.562023.880224.198424.516724.834925.153125.471325.789626.107826.426126.744327.062527.380727.699028.017228.335528.653722.23022.54822.86723.18523.50423.82224.14124.45924 77825.09625.41525.73326.05226.37026.68927.00727.32627.64427.96228.28128.59928.91829.23610810911011111211311411511611711811912034.382334.700635.018935.337135.655435.973736.291936.610236.928537.246737.565037.883338.201634.96835.28635.60535.92336.24136.56036.87837.19737.51537.83338.15238.47038.788
