Abstract The interference fit surface between planetary gears and corresponding bearings in the planetary gearbox suffers from the most severe variable load during operation and is prone to fatigue failure. It is generally believed that the failure mode of the interference fit surface is only fretting wear. In this study, the fretting and slipping between the planetary gear inner hole and the bearing outer ring is investigated by force analysis and the finite element method. The fatigue failure mode is analyzed for the planetary gears and corresponding bearings in a planetary gearbox which standardly designed according to IEC 61400-4:2012. The surface hardness is verified according to ISO 18203:2016. Fatigue crack sources, fretting wear, and traces of slipping are found on the failed inner hole of the planetary gear and outer rings of the bearing. The failure mode of the interference fit surface between the planetary gears and the bearings is determined as simultaneous fretting and slipping under a variable load, caused by differences in the dynamic meshing forces of internal and external engagement.

中文翻译：

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行星齿轮系统微动滑动疲劳失效模式

摘要 行星齿轮箱中行星齿轮与相应轴承的过盈配合面在运行过程中承受的变载荷最为剧烈，容易发生疲劳失效。一般认为过盈配合面的失效模式仅为微动磨损。在这项研究中，行星齿轮内孔和轴承外圈之间的微动和滑动是通过力分析和有限元方法研究的。对按照IEC 61400-4:2012标准设计的行星齿轮箱中的行星齿轮及相应轴承进行疲劳失效模式分析。表面硬度根据 ISO 18203:2016 进行验证。在失效的行星齿轮内孔和轴承外圈上发现了疲劳裂纹源、微动磨损和打滑痕迹。