滤波减速器有限长轮齿接触表面混合润滑分析

综合考虑了轮齿接触几何、啮合点法向载荷、齿向参数、真实表面粗糙度、润滑剂流变特性等因素,建立了滤波减速器轮齿混合润滑数值分析模型,采用复合迭代法和快速傅里叶变换(FFT)方法分别求解Reynolds方程和弹性变形方程,获得了轮齿接触表面混合润滑分析完全数值解,得到了滤波减速器在啮入点、节点和啮出点的压力与平均油膜厚度,以及转速对轮齿接触表面平均油膜厚度和接触比的影响.结果表明:在啮入点、啮出点及节点处,沿齿宽方向的压力分布不相等,两侧压力较大,而在啮入点处的两侧压力突变相对较小,且平均油膜厚度最大;对于粗糙轮齿接触表面,随着滤波减速器转速逐渐降低,啮入点、节点及啮出点的平均油膜厚度随之减小,接触比增加,润滑效果变差,并且在同一工况下粗糙轮齿接触表面的啮合点平均油膜厚度小于光滑轮齿表面的平均油膜厚度. 

Mixed lubrication analysis in finite tooth contact surface of filtering reducer

The numerical analysis model for mixed lubrication of filtering reducer tooth was built considering the tooth contact geometry, normal load of meshing point, tooth parameters, real surface roughness, rheological behavior of lubricant. A completely numerical solution of mixed lubrication analysis in tooth contact surface was achieved by solving the Reynolds equations and elastic deformation equations using compound iteration method and fast Fourier transformation (FFT) method respectively. The pressure and average film thickness were obtained at engaging-in point, engaging-out point and pitch point of filtering reducer, and the effects of speed on the average film thickness and contact area ratio in tooth contact surface were also obtained. The results show that the pressure distribution along the tooth width direction is not equal at engaging-in point, engaging-out point and pitch point, and pressures on both sides are higher; the variation of pressure is smaller on both sides and the average film thickness is greater at engaging-in point. When the tooth contact surface is rough, with the decrease of speed of filtering reducer, the average film thickness at engaging-in point, engaging-out point and pitch point is decreased, and the contact area ratio increases, leading to poor lubrication. Besides, the average film thickness of meshing points of rough tooth contact surface is less than that of smooth tooth contact surface under the same conditions.