标准直齿跨测齿数与公法线长度

标准直齿跨测齿数与公法线长度标准直齿轮（m=1 α=20°）公法线长度和跨测齿数
齿数 跨测齿数 公法线长度 模数
z K Wk m=2 m=3 m=4 m=5 m=6 m=7
4 2 4.48422 8.96844 13.45266 17.93688 22.42110 26.90532 31.38954
5 2 4.49822 8.99644 13.49466 17.99288 22.49110 26.98932 31.48754
6 2 4.51223 9.02446 13.53669 18.04892 22.56115 27.07338 31.58561
7 2 4.52624 9.05248 13.57872 18.10496 22.63120 27.15744 31.68368
8 2 4.54024 9.08048 13.62072 18.16096 22.70120 27.24144 31.78168
9 2 4.55425 9.10850 13.66275 18.21700 22.77125 27.32550 31.87975
10 2 4.56825 9.13650 13.70475 18.27300 22.84125 27.40950 31.97775
11 2 4.58226 9.16452 13.74678 18.32904 22.91130 27.49356 32.07582
12 2 4.59626 9.19252 13.78878 18.38504 22.98130 27.57756 32.17382