含点蚀故障的行星齿轮系统刚度分析
Stiffness Analysis of Planetary Gear System with Pitting Fault

行星齿轮传动机构是特种车辆自动变速器的核心部件，其在复杂多变的服役工况下，常常会发生各种故障。这些故障不仅影响车辆的正常运行，还可能导致严重的安全隐患。因此，明确故障机理对于齿轮传动系统的故障诊断具有极其重要的意义。本文以某特种车辆自动变速器为研究对象，选取第三排行星轮作为典型元件，建立了包含齿轮点蚀故障的啮合刚度模型。通过该模型，深入分析了不同程度的点蚀故障对时变啮合刚度的影响。研究结果表明，与健康齿轮的啮合刚度相比，含故障的齿轮在故障区域的啮合刚度出现了明显下降。此外，点蚀故障在齿根位置对刚度的影响更为显著。这一发现为齿轮故障的早期检测和诊断提供了重要的理论依据，也为特种车辆自动变速器的维护和可靠性提升提供了有力支持。
The planetary gear transmission mechanism is a core component of the automatic transmission in special-purpose vehicles. Under complex and variable working conditions, various faults often occur in this mechanism. These faults not only affect the normal operation of the vehicle but can also lead to serious safety hazards. Therefore, clarifying the failure mechanisms is of paramount importance for the fault diagnosis of gear transmission systems. In this study, the automatic transmission of a specific special-purpose vehicle was selected as the research object. The third row of planet gears was chosen as a typical element, and a meshing stiffness model incorporating gear pitting faults was established. Through this model, the impact of pitting faults of different degrees on the time-varying meshing stiffness was thoroughly analyzed. The research results show that compared with the meshing stiffness of healthy gears, the meshing stiffness of gears with faults exhibits a significant decrease in the fault region. Moreover, pitting faults at the root of the tooth have a more pronounced effect on stiffness. This finding provides important theoretical support for the early detection and diagnosis of gear faults and also offers strong backing for the maintenance and reliability improvement of automatic transmissions in special-purpose vehicles.