含摩擦齿根弯曲应力载荷历程计算与测试

发布时间：2018-03-27 07:14

本文选题：齿轮传动　切入点：齿根弯曲应力　出处：《机械传动》2016年11期

【摘要】：以主动轮齿为对象,考虑法向力和摩擦力的共同作用,研究齿对从进入到退出啮合过程中齿面摩擦对弯曲强度的影响。根据齿面摩擦力的变化规律,提出以分度圆为界将啮合区划分为上啮合区和下啮合区,推导出不同啮合区的含摩擦齿根弯曲强度计算式。实例计算显示,上啮合区考虑摩擦比不考虑摩擦齿根弯曲应力值约大3%;下啮合区考虑摩擦比不考虑摩擦齿根弯曲应力值约小4%;齿根弯曲应力在节点处的突变较好地反映了摩擦力在该点的突然换向。测试结果与计算值比较表明,齿根弯曲应力历程曲线的变化趋势一致;若计算式中引入动载系数,测试值与计算值的偏差小于10%。测试结果初步验证了上述计算模型的正确性,考虑摩擦时齿根弯曲应力计算值更可靠。
[Abstract]:The effect of tooth surface friction on bending strength is studied by considering the common action of normal force and friction force on the active gear tooth, according to the variation law of tooth surface friction force, the influence of tooth surface friction on bending strength during the process of entering and withdrawing from meshing is studied. The meshing region is divided into upper meshing region and lower meshing zone, and the formulas for calculating the bending strength of tooth root with friction in different meshing regions are derived. In the upper meshing region, the bending stress value of tooth root is about 3 percent larger than that in the lower meshing zone, and the bending stress value of tooth root is about 4 percent smaller than that in the lower meshing zone. The abrupt change of tooth root bending stress at the joint reflects the friction force. A sudden reversal at this point. The comparison of the test results with the calculated values shows that, If the dynamic load coefficient is introduced into the formula, the deviation between the measured value and the calculated value is less than 100.The experimental results preliminarily verify the correctness of the above calculation model. When friction is considered, the calculation value of tooth root bending stress is more reliable.
【作者单位】：湖南大学国家高效磨削工程技术研究中心;中南大学高性能复杂制造国家重点实验室;
【基金】：国家自然科学基金(51275160) 高性能复杂制造国家重点实验室开放课题基金(Kfkt2014-03)
【分类号】：TH132.41

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