标准链轮尺寸

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=PCDcos90/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)111213141516171819202l22232425262728293031323334353637383940414243444546474849503.54953.86374.17864.49404.80975.12585.44225.75886.07556.39256.70957.02677.34397.66137.97878.29628.61388.93149.24919.56689.884510.202310.520110.838011.155811.473711.791612.109612.427512.745513.063513.381513.699514.017514.335614.653614.971715.289815.607915.92604.0064.3324.6574.9815.3055.6275 9506.2716 5936 9147.2357.5557 8768 1968.5168.8369.1569.4759.79510.11410.43410.75311.07211.39211.71112.03012.34912.66812.98713.30613.62513.94414.36314.58214 90115.21915.53815.85716.17616.4955252535455565758596061626364656667686970717273747576777879808182838485868788899016.244116.562216.880317.198417.516617.834718.152918.471018.789219.107319.425519.743720.061820.380020.698221.016421.234921.652821.971022.289222.607422.925623.243823.562023.880224.198424.516724.834925.153125.471325.789626.107826.426126.744327.062527.380727.699028.017228.335528.653716.81317.13217.45117.76918.08818.40718.72519.04419.36319.68120.00020.31820.63720.95521.27421.59321.91122.23022.54822.86723.18523.50423.82224.14124.45924 77825.09625.41525.73326.05226.37026.68927.00727.32627.64427.96228.28128.59928.91829.23691929394959697989910010110210310410510610710810911011111211311411511611711811912028.972029.290229.608529.926730.244930.563230.881531.199731.518031.836232.154532.472732.791033.109333.427533.745834.064134.382334.700635.018935.337135.655435.973736.291936.610236.928537.246737.565037.883338.201629.29029.87330.19230.51030.82831.14731.46531.78432.10232.42132.73933.05733.376