Causes of gear shaft fracture in marine gearbox

HU Qiancheng; ZHOU Jun; LI Bing

doi:10.11973/lhjy-wl202404011

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中国机械工程学会理化检验分会失效分析分会会刊

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PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2024 > 60(4): 46-48. > DOI: 10.11973/lhjy-wl202404011

HU Qiancheng, ZHOU Jun, LI Bing. Causes of gear shaft fracture in marine gearbox[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2024, 60(4): 46-48. DOI: 10.11973/lhjy-wl202404011

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Causes of gear shaft fracture in marine gearbox

1.
The 11th Military Representative Office of the Naval Equipment Department in Shanghai, Shanghai 200129, China
2.
Hudong Heavy Machinery Co., Ltd., Shanghai 200129, China

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Received Date: February 18, 2024

Graphical Abstract

Abstract

Abstract

Aiming at the tooth fracture accident of the middle gear shaft in the marine gearbox, the causes of the tooth fracture were analyzed by means of macroscopic observation, chemical composition analysis, scanning electron microscopy and energy spectrum analysis, hardness test and metallographic examination. The results show that there was Al₂O₃ slag on the subsurface of the middle gear shaft, and the alternating stress existed in the gear during operation, which caused the microcracks to initiate in the gear, and the microcracks further fatigue expanded, eventually leading to the fracture of the gear.
- gear shaft,
- fatigue fracture,
- Al₂O₃ slag,
- alternating stress,
- hardness gradient