Typical Gearbox Failures in Gobi Environment

YU Shisheng; ZHEN Wei; YAN Shuai; WANG Yeping

doi:10.7643/ issn.1672-9242.2026.02.003

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (2) : 15-23. DOI: 10.7643/ issn.1672-9242.2026.02.003

Weapons Equipment

Typical Gearbox Failures in Gobi Environment

YU Shisheng, ZHEN Wei, YAN Shuai, WANG Yeping

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Abstract

To address the recurring gearbox failures caused by trailer recovery operations in the Gobi environment, the work aims to conduct an in-depth investigation into typical gearbox failure mechanisms and formulate effective preventive measures to prevent the recurrence of such failures. Multiple analytical and testing methods were employed to analyze the failed gearbox, including finite element software simulation, lubricant condition monitoring and analysis, and scanning electron microscopy (SEM) examination. The analysis revealed that the fracture of the first-gear wheel on the countershaft was not induced by overload. Instead, it resulted from the gear's hardened layer being damaged due to prolonged and repeated exposure to significant contact stress. This led to fatigue corrosion, initiation of fatigue cracks, and ultimately fatigue fracture during high-torque loading. To prevent the recurrence of such failures, referencing the condition monitoring methods used for aircraft Constant Speed Drives (CSDs), lubricant condition monitoring is proposed to be integrated into the vehicle's regular maintenance schedule. This enables quantitative assessment of the operational status of enclosed circulating systems like gearboxes. Systems exhibiting abnormal conditions can thus undergo preventive maintenance, preventing sudden failures during equipment operation and ensuring mission success.

Key words

gearbox / finite element method / oil detection / gear / fatigue fracture / contact stress

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YU Shisheng, ZHEN Wei, YAN Shuai, WANG Yeping. Typical Gearbox Failures in Gobi Environment[J]. Equipment Environmental Engineering. 2026, 23(2): 15-23 https://doi.org/10.7643/ issn.1672-9242.2026.02.003

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