Meshing spur gears must have the same diametral pitch.
互相啮合的直齿圆柱齿轮,必须具有相同的径节.
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Diametral pitch : the number of teeth per inch of pitch - circle diameter.
径节 --- 节圆直径每英寸长度上的齿数.
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The stub pitch for splines in this standard is twice the diametral pitch.
在本标准中,花键的残余径节是径节的2倍.
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