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The elasto-hydrodynamic lubrication (EHL) contact of metal tooth surfaces stands as a critical and intricate challenge. In this paper, a numerical EHL model for metallic tooth surfaces is established. By combining elliptical Hertzian contact, pressure–temperature coupled rheology, and load distribution, the pressure, film thickness, and elastic deformation are computed under rated and varying operating conditions. Results show the pressure peak appears on the outlet side and is significantly higher than Hertzian theory; the minimum film thickness is about 0.079 μm. Increasing speed considerably thickens the film, whereas increasing load mainly elevates and shifts the pressure peak. The findings inform tooth modification and lubrication strategy optimization.

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Numerical Simulation of Elastohydrodynamic Lubrication of Metallic Tooth Surfaces in the Helicopter Main Gearbox Planetary Gears

  • 会议论文

  • 发表日期：

    2026年

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  • Changqing Wang,
  • Shaoying Ren

摘要

The elasto-hydrodynamic lubrication (EHL) contact of metal tooth surfaces stands as a critical and intricate challenge. In this paper, a numerical EHL model for metallic tooth surfaces is established. By combining elliptical Hertzian contact, pressure–temperature coupled rheology, and load distribution, the pressure, film thickness, and elastic deformation are computed under rated and varying operating conditions. Results show the pressure peak appears on the outlet side and is significantly higher than Hertzian theory; the minimum film thickness is about 0.079 μm. Increasing speed considerably thickens the film, whereas increasing load mainly elevates and shifts the pressure peak. The findings inform tooth modification and lubrication strategy optimization.