Fatigue failure mechanism of planetary gear train for wind turbine gearbox
Fatigue failure mechanism of planetary gear train for wind turbine gearbox
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风电齿轮箱行星轮系疲劳失效机理
DOI：
10.1016/j.engfailanal.2018.01.007
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发表时间：
2018-05-01
影响因子：
4
通讯作者：
Li, Yanlin
中科院分区：
文献类型：
--
作者：
Shen, Gang;Xiang, Dong;Li, Yanlin
据统计，变速箱故障往往是风电机组停机时间最长、经济损失最大的原因。运行经验表明，行星轮系经常出现损伤形态。结合实例，提出了行星齿轮失效发展过程可分为微动磨损和疲劳源产生两个阶段的假设。对于微动磨损阶段，重点测试了齿轮内表面与轴承外圈的硬度差，分析了过盈配合公差对微动滑移距离的影响，探讨了轮毂厚度对微动滑移距离的影响。提出了相应的技术改进措施，实验数据表明，这些措施是行之有效的。在疲劳源产生阶段，齿轮内表面的圆度误差和齿面的齿形误差会影响啮合齿轮副的径向游隙。结果，齿轮内表面出现了不均匀的载荷区。对不均匀载荷区的综合应力进行了定量分析，揭示了对称疲劳源的形成机理，并最终通过实际破坏案例进行了验证。
According to the statistics, failure of gearbox often leads to the longest downtime and maximum economic loss for wind turbine. Operational experience reveals that damage morphology often occurs on planetary gear trains. Based on real cases, the hypothesis that failure developing process of planetary gear is divided into two stages including fretting wear and fatigue source generation has been proposed. For the fretting wear stage, the research work focuses on testing the hardness difference between gear inner surface and bearing outer ring, analyzing the influence of interference fit tolerance on fretting slip distance, and exploring the influence of gear hub thickness on fretting slip distance. The relevant technical improvement measures are proposed and following experimental data have shown these measures are quite effective. At the stage of fatigue source generation, the roundness error of gear inner surface and the profile error of tooth surface can affect the radial clearance of the meshing gear pair. As a result, uneven load region on gear inner surface appears. Following quantitative analysis of comprehensive stress on the uneven load region reveals the formation mechanism of symmetrical fatigue source, which has been verified by the real failure case eventually.