从有效硬化层深度的定义出发，通过理论分析和试验结果，探讨了渗碳齿轮有效硬化层深度与齿轮接触疲劳强度和弯曲疲劳强度的关系，得出了有效硬化层深度的最小值由接触强度决定，而最大值由弯曲强度决定的结论。在此基础上，并参照国外的有关资料提出了不同模数时的最佳有效硬化层深度值。 Based on the definition of the effective depth of hardened layer, the relationship between the effective hardened depth of carburized gear and the contact fatigue strength and flexural fatigue strength of the gear is discussed through theoretical analysis and experimental results. The minimum of effective hardened depth is obtained from the contact strength Decided, and the maximum value determined by the bending strength of the conclusion. On this basis, and with reference to foreign relevant data, the optimal effective hardened layer depth at different modulus is proposed.