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
齿系数 系数 齿系数 系数 齿系数 系数 数1/[sin(180.6+cot(1 数 1/[sin(18016+cot(数 1/[sin(180.6+cot(10/N)] 11 12 13 14 15 16 17 18 19 20 3.5495 80/N) 4.006 52 52 53 54 55 56 57 58 59 60 0/N)] 180/N) 91 92 93 94 95 96 97 98 99 10/N)] 28.972 80/N) 29.29 16.2441 16.813 3.8637 4.332 16.5622 17.132 29.2902 29.873 4.1786 4.657 16.8803 17.451 29.6085 30.192 4.494 4.981 17.1984 17.769 29.9267 30.51 4.8097 5.305 17.5166 18.088 30.2449 30.828 5.1258 5.627 17.8347 18.407 30.5632 31.147 5.4422 5 950 18.1529 18.725 30.8815 31.465 5.7588 6.271 18.471 19.044 31.1997 31.784 6.0755 6 593 18.7892 19.363 31.518 32.102 6.3925 6 914 19.1073 19.681 031.8362 32.421 0 2l 6.7095 7.235 61 119.4255 20 032.1545 32.739 1 119.7437 20.318 032.4727 33.057 2 120.0618 20.637 032.791 33.376 3 120.38 20.955 033.1093 33.694 4 120.6982 21.274 033.4275 34.013 5 121.0164 21.593 033.7458 34.331 6 121.2349 21.911 034.0641 34.694 7 22.23 134.3823 34.968 22 7.0267 7.555 62 23 7.3439 7 876 63 24 7.6613 8 196 64 25 7.9787 8.516 65 26 8.2962 8.836 66 27 8.6138 9.156 67 28.9314 9.475 621.6528 8 8 08 29 9.2491 9.795 69 121.971 22.548 034.7006 35.286 9 122.2892 22.867 135.0189 35.605 0 122.6074 23.185 135.3371 35.923 1 122.9256 23.504 135.6554 36.241 2 123.2438 23.822 135.9737 36.56 3 123.562 24.141 136.2919 36.878 4 23.8802 24.459 1136.6102 37.197 30 9.5668 10.114 70 31 9.8845 10.434 71 32 10.2023 10.753 72 33 10.5201 11.072 73 34 35 10.838 11.392 74 75 11.1558 11.711 5 36 76 124.1984 24 778 136.9285 37.515 6 124.5167 25.096 137.2467 37.833 7 124.8349 25.415 137.565 38.152 8 125.1531 25.733 137.8833 38.47 9 125.4713 26.052 238.2016 38.788 0 25.7896 26.37 11.4737 12.03 37 11.7916 12.349 77 38 12.1096 12.668 78 39 12.4275 12.987 79 40 41 42 43 12.7455 13.306 80 81 82 83 13.0635 13.625 13.3815 13.944 26.1078 26.689 13.6995 14.363 26.4261 27.007 44 45 46 47 48 49 50
14.0175 14.582 84 85 86 87 88 89 90 26.7443 27.326 14.3356 14 901 27.0625 27.644 14.6536 15.219 27.3807 27.962 14.9717 15.538 27.699 28.281 15.2898 15.857 28.0172 28.599 15.6079 16.176 28.3355 28.918 15.926 16.495 28.6537 29.236
因篇幅问题不能全部显示，请点此查看更多更全内容