升降法测定齿轮的弯曲疲劳极限  

Determination of Gear Bending Fatigue Limit based on Up and Down Method

作　　者：杨广明[1] 

机构地区：[1]重庆电子工程职业学院,重庆401331

出　　处：《机械传动》2015年第8期176-180,共5页Journal of Mechanical Transmission

基　　金：国家自然科学基金(51205425);重庆市教委科学技术项目(KJ122202)

摘　　要：齿轮弯曲疲劳强度是衡量齿轮性能的重要指标,开展齿轮试验是获得齿轮弯曲强度的有效方法。针对20Cr Mo H渗碳齿轮,采用升降法开展单齿弯曲疲劳强度试验研究,基于脉动加载法和成组试验方案,在电磁谐振疲劳试验机上对齿轮轮齿进行了5个应力级的疲劳强度试验;依据平截面和折截面两种方法计算轮齿齿根应力,分析得到了该齿轮的弯曲疲劳极限;结合轮齿裂纹位置和断口形貌,分析了形成原因,结果表明,折截面法确定的危险截面位置更加符合实际,为进一步研究齿轮的弯曲疲劳强度提供了基本思路。The bending fatigue strength of gear is an important indicator for gear performance,and it is an effective method to obtain the bending strength according to the test procedure. The test of the single- tooth bending fatigue strength of 20 Cr Mo H carburized gear is discussed. The test method of pulse load in single-tooth and the group method is used in the experiment and the bending fatigue strength test of gear tooth at 5classes of constant stress levels is carried out on the electromagnetic resonance testing machine. By applying planar section method and broken- line section method,the root stress of gear teeth under different load levers is calculated. The macro morphology of fatigue fracture of gear test specimens is analyzed. The result shows that it is more actual to determine the risk position with broken- line section method. It provides a new approach for evaluating the gear bending fatigue strength.

关 键 词：齿轮 弯曲疲劳试验 升降法 弯曲疲劳极限 

分 类 号：TH132.41[机械工程—机械制造及自动化]