直升机主减速器变形对传动性能的影响分析

综合考虑了直升机主减速器机匣、轴系及轴承的支撑变形,计算了在实际工况下弧齿锥齿轮副的当量错位量。利用ANSYS软件对机匣进行静力分析,通过最小二乘优化方法得到了加载条件下输入轴和输出轴的轴线方程;对齿轮副进行受力分析,采用一维有限元方法计算了轴系及轴承各节点处的位移;将两组变形量叠加求出了当量错位量。建立了考虑错位量的轮齿接触分析(TCA)模型,根据错位量对齿面进行再设计,获得了优化后的小轮加工参数。结果表明:在变形形成当量错位条件下,齿面受载时,优化后的齿轮副齿面印痕会靠近齿面中心,改善了齿轮副的啮合质量。

Analysis of influence of helicopter main gearbox deformation on transmission performance

Considering the support deformation of the casing, shafting and bearing, the equivalent misalignment of the spiral bevel gear was calculated under actual conditions. Firstly, the static analysis of the casing was carried out by commercial software ANSYS, and the axial equation of the input and output shafts under the loading condition was obtained by the least square optimization method. Then, the force analysis of the gears was performed, and the displacement of the shaft and bearing nodes was calculated by the one-dimensional finite element method. The equivalent misalignment amount was obtained by superposition of two groups of deformation. The tooth contact analysis (TCA) model considering the misalignment amount was established, and the optimized machining parameters were acquired by the redesign of the tooth surface. Result showed that under the condition of deformation forming equivalent misalignment, the contact patterns would get close to the center of the tooth surface when the gear was loaded, and the meshing quality can be improved.