20CrMnMo渗碳淬火齿轮的接触疲劳强度

Contact Fatigue Strength of 20CrMnMo Carburized and Quenched Gears

对齿面硬度HRC62的20CrMnMo渗碳淬火齿轮,进行了接触疲劳运转试验,获得33个试验数据。经过数据处理,绘制出R—S—N曲线,可靠度0.99,循环基数5×10~7,其齿面接触疲劳极限应力为1571.6N/mm^2。通过电镜等,对齿面损伤特性进行了宏观和微观的分析,获得一些有益的观点,提出一些有效的技术措施。

Using power circulating type gear tester , 33 pairs 20CrMnMo carburized and quenched gears, having tooth surface hardness HRC62 , were tested to investigate the contact fatigue life. The test results were treated by statistical methods and plotted as R - S - N curve. The contact strength limits σHlim were 1 571. 6 N/mm2 with reliability 0. 99 at 5×107 cystes. By using scanning electron microscope etc. , the texture of tooth surface damage were described and the mechanism of failures was investigated.