五金之家讯：●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=38.1×7.9789=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=38.10×8.516=324.4596，或取小数点后1位并四舍五入324。
齿根圆直径BD=PCD—R
最大齿根距离(卡钳测量)：CD
对于奇数齿：CD=PCDcos90/N—R
对于偶数齿：CD=BD
链轮标准规格尺寸一览表齿数系数系数齿数系数系数齿数系数系数1/[sin(180/N)]0.6+cot(180/N)1/[sin(180/N)]016+cot(180/N)1/[sin(180/N)]0.6+cot(180/N)113.54954.0065216.244116.8139128.97229.29123.86374.3325216.562217.1329229.290229.873134.17864.6575316.880317.4519329.608530.192144.4944.9815417.198417.7699429.926730.51154.80975.3055517.516618.0889530.244930.828165.12585.6275617.834718.4079630.563231.147175.442259505718.152918.7259730.881531.465185.75886.2715818.47119.0449831.199731.784196.075565935918.789219.3639931.51832.102206.392569146019.107319.68110031.836232.4212l6.70957.2356119.42552010132.154532.739227.02677.5556219.743720.31810232.472733.057237.343978766320.061820.63710332.79133.376247.661381966420.3820.95510433.109333.694257.97878.5166520.698221.27410533.427534.013268.29628.8366621.016421.59310633.745834.331278.61389.1566721.234921.91110734.064134.694288.93149.4756821.652822.2310834.382334.968299.24919.7956921.97122.54810934.700635.286309.566810.1147022.289222.86711035.018935.605319.884510.4347122.607423.18511135.337135.9233210.202310.7537222.925623.50411235.655436.2413310.520111.0727323.243823.82211335.973736.563410.83811.3927423.56224.14111436.291936.8783511.155811.7117523.880224.45911536.610237.1973611.473712.037624.19842477811636.928537.5153711.791612.3497724.516725.09611737.246737.8333812.109612.6687824.834925.41511837.56538.1523912.427512.9877925.153125.73311937.883338.474012.745513.3068025.471326.05212038.201638.7884113.063513.6258125.789626.374213.381513.9448226.107826.6894313.699514.3638326.426127.0074414.017514.5828426.744327.3264514.3356149018527.062527.6444614.653615.2198627.380727.9624714.971715.5388727.69928.2814815.289815.8578828.017228.5994915.607916.1768928.335528.9185015.92616.4959028.653729.236五金之家主要为五金,五金
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