同步轮主要部位允许公差同步轮节距公差同步轮外径公差轮外径允许差值任意两相临齿间90弧内约允差≤25.4000.030.05>25.40-50.800.030.08>50.80-101.600.030.10>101.60-177.800.030.13>177.80-304.800.030.15>304.80-508.000.030.18>508.000.030.20轮外径允许偏差≤25.4+0.05025.40-50.80+0.08050.80-101.60+0.100101.60-177.80+0.130177.80-304.80+0.150304.80-508.00+0.180508.00+0.200同步轮端面允许跳动量同步轮径向允许跳动量同步轮外径允许跳动量≤101.600.10>101.60-254.00轮外径×0.001>254.000.25+(轮外径-254.00)×0.005同步轮外径允许值≤203.200.13>203.200.13+(轮外径-203.20)×0.005)