摘要
减速器齿轮轴既承受弯矩又承受扭矩,在工作中受交变应力作用,失效模式为疲劳断裂。传统设计方法以计算安全系数为主要内容,以计算安全系数时用到的应力、强度等参数单值为前提。将减速器齿轮轴的疲劳失效看成是一个随机事件。根据应力-强度干涉理论,通过确定工作应力,考虑了零件的几何形状产生的应力集中、尺寸系数、表面加工方法等因素的概率分布状态,绘制轴的疲劳极限线图。并通过计算疲劳可靠性,验证设计结论的有效性。该设计范例对其它轴的疲劳可靠性设计具有一定的借鉴作用。
The reducer gear shaft can bear both bending moment and torque. Under the effect of aldternating stress, the failure mode is fatigue fracture. The traditional design mainly calculates security coefficient based on parameter values such as stress, strength. It will treat fatigue failure of reducer gear shaft as a random event. According to the stressstrength interference theory, with determined working stress, the fatigue limit diagram of shaft cart be drawn by considering the probability distribution for part geometry caused by such elements as stress concentration, size coefficient, and surface processing method. The reliability of design conclusion is verified by calculating fatigne reliability. This design pattern can serve as a reference for fatigue reliability design fother shafts.
出处
《机械设计与制造》
北大核心
2014年第7期61-64,共4页
Machinery Design & Manufacture
基金
典型产品运行安全寿命预测技术研究(国家高技术研究发展计划(863)子课题)(2012AA040104)
