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借助分形函数模拟齿面粗糙度,基于弹流理论建立了齿轮传动混合润滑模型,采用多重网格法进行了5组数值计算,从理论上探讨了润滑剂黏度对重载齿轮传动齿面接触应力的影响。结果表明:对齿轮润滑而言,合理选择润滑剂黏度十分重要。随着黏度的增大,齿轮润滑状态逐渐从边界润滑历经混合润滑过渡到全膜润滑;与此同时,由齿面粗糙度引起的压力波动减小、幅值降低且油膜厚度同时增大,所有这些均有助于提高齿轮传动齿面接触寿命。
By using the fractal function to simulate the roughness of tooth surface, a gear-driven hybrid lubrication model was established based on the theory of fluid flow. Five sets of numerical calculations were carried out by using the multi-grid method. The contact stress of the lubricant on the gear tooth surface Impact. The results show that it is very important to select lubricant viscosity reasonably for gear lubrication. With the increase of viscosity, the gear lubrication state gradually transition from boundary lubrication to full film lubrication. At the same time, the pressure fluctuation caused by the tooth surface roughness decreases, the amplitude decreases and the film thickness increases at the same time. These all help to improve the contact life of gear tooth flanks.