为了降低人字齿轮传动系统的风阻功率损失，基于动网格技术，建立人字齿轮传动系统内部空气流体动力学模型，仿真分析了齿轮箱内部气流特性，探究齿轮转速、减阻结构挡风罩和隔板到齿顶不同距离、挡风罩覆盖齿轮范围和隔油板对齿面风阻功率损失的影响规律。结果表明：轮齿从啮入到啮出过程中受到交变风压载荷导致齿面出现压差力矩为风阻损失的主要原因，齿轮风阻功率与转速的3次方成正相关；挡风罩和隔板到齿顶距离的改变对齿轮副周围流域改变量影响较小，不同距离对齿轮副总风阻功率影响不大；增大挡风罩覆盖齿轮的范围和增加底部隔油板均能有效减小齿轮副周围流域使得总风阻功率有所降低。

In order to reduce the windage loss of the double helical gear transmission system，based on the dynamic mesh technology, the air hydrodynamic model inside the double helical gear transmission system was established, and air flow characteristics inside gearbox were simulated and analyzed. The influences of gear speed, drag reduction structure windscreen and baffle to the addendum circle at different distances, the range of gear covered by the windscreen and the grease screen on the wind resistance power of the gear surface were investigated. The results show that the main reason for the windage loss is the pressure difference moment on the tooth surface caused by the alternating wind pressure load during the process of gear teeth from biting in to biting out, and the wind resistance power is positively correlated with the third square of gear speed. The change of the distance from windscreen and baffle to addendum circle has little effect on the change of the river basin around the gear pair, and different distances have little effect on the total wind resistance power of the gear pair. Increasing the range of gear covered by windscreen and bottom grease trap can effectively reduce the river basin around the gear pair and reduce the total windage power loss.