On Strain of Gear Meshing Thermo-Mechanical Coupling

Abstract:

Involute helical gears are widely used in high-speed and heavy-load transmission systems of automobiles, helicopters, etc. Poor working conditions lead to fatigue crack and other faults of gear key parts such as tooth face and tooth root. To identify the root causes of gear faults, strain monitoring methods are often used to monitor the stress changes of gear key parts so as to work out individualized improvement plans. However, stress of gears in the work process is typically the result of the coupling effect of thermal stress and mechanical stress. The existing strain monitoring methods cannot separate them effectively, and thus it is impractical to quickly find the corresponding improvement measures. To reveal the coupling relationship between thermal stress and mechanical stress during gear meshing and find out the source of gear faults, this paper uses the transient finite element-based analysis method to study the coupling relationship between thermal strain and mechanical strain of a pair of helical gears in the test direction and find the coupling rules of thermal strain and mechanical strain among the strains of gears in the strain test direction that may provide effective guidance for the fault diagnosis of gear meshing.

• Periodical: Key Engineering Materials (Volume 572)
• Pages: 359-362
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.572.359
• Online since: September 2013
• Authors: Yu Mei Hu, Fang Jian Zhang, Yi Min Shao
• Keywords: Finite Element Method (FEM), Helical Gear, Thermal Stress

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