BRECO同步带同步带轮XH理论尺寸表同步带轮各种规格、型号主要部位理论尺寸表（挡边尺寸仅供参考）XH型（节距=22.225mm）规格齿数节径d外径do档边直径df档边内径db档边厚度h18XH18127.34124.551391101.519XH19134.41131.621461174.520XH20141.49138.691531244.521XH21148.56145.771601314.522XH22155.64152.841641341.523XH23162.71159.921751431.524XH24169.79166.991811524.525XH25176.86174.071881594.526XH26183.94181.141951664.527XH27191.01188.222021734.528XH28198.08195.292091804.530XH30212.23209.4432XH32226.38223.5940XH40282.98280.1848XH48339.57336.7860XH60424.47421.6772XH72509.36506.5784XH84594.25591.4696XH96679.15676.35120XH120848.93846.14)