分析了某型直升机主减速器行星齿轮机构弹流润滑工况,研究了该齿轮系弹性润滑最薄弱啮合部位,计算得出了行星齿轮传动机构中齿宽、齿轮模数和压力角等齿轮参数对弹性润滑油膜厚度的影响,提出了改进直升机主减速器行星齿轮机械润滑状态的新思路和具体改进方案,结果证明增加行星轮和太阳轮的齿宽、模数和齿轮啮合角及提高润滑油粘度和粘压系数,可有效地改进齿轮润滑,减少齿面失效,提高行星齿轮传动机构的可靠性。 The lubrication condition of the planetary gear mechanism of a helicopter main reducer was analyzed. The weakest meshing position of the gear system was studied. The gear parameters such as gear width, gear modulus and pressure angle in the planetary gear train were calculated. On the elastic lubricant film thickness, put forward to improve the helicopter main reducer planetary gear lubrication state of the new ideas and specific improvements, the results prove that increase the planetary gear and sun gear tooth width, modulus and gear meshing angle and improve the lubricating oil Viscosity and pressure coefficient can effectively improve the gear lubrication, reduce tooth surface failure and improve the reliability of planetary gear drive mechanism.