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HTD型半弧齿同步轮尺寸参数表槽节距pb齿槽深hg齿槽圆弧半径R齿顶圆半角r1齿槽宽S齿形角型两倍节顶距253M31.280.910.26-0.351.900.762〜145M52.161.560.4