Planetary gear reducer is widely used. As the power output terminal, planetary carrier has better load-bearing performance, higher hardness of tooth surface, high reliability, and high transmission efficiency,¹ but it has a high failure rate in the process it is being used. The interference fit is often used between the planetary frame and the planetary wheel axle. The elastic deformation between the fittings is different. Affected by the internal and external excitations, there will be relatively small fretting amplitude of relative reciprocating slip at the joints, which leads to fretting wear between the contact surfaces. Finally, the fatigue life of the planetary frame decreases as a whole.²

中文翻译：

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干涉对行星架轴孔微动磨损的影响

行星齿轮减速器被广泛使用。行星架作为动力输出端子，具有更好的承载性能，更高的齿面硬度，更高的可靠性和更高的传动效率，¹但在使用过程中其故障率很高。过盈配合通常在行星架和行星轮轴之间使用。配件之间的弹性变形是不同的。受内部和外部激励的影响，在关节处相对往复滑动的微动振幅相对较小，从而导致接触面之间的微动磨损。最后，行星框架的疲劳寿命总体上减少。²