In this paper, contact endurance limit diagram of 45 normalizing gear is obtained from contact fatigue teste on 8 pairs of CATT gears. It is worthy reference for a calculation of gear design.

本文通过八对圆弧齿线圆柱齿轮的运转接触疲劳试验，得到了45钢正火齿轮的接触疲劳极限应力框图，可供圆弧齿线圆柱齿轮传动的接触强度计算参考使用。

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