螺旋锥齿轮润滑试验相似模型及影响因素

Similarity Model for Lubrication Experiment of Spiral Bevel Gear and Influencing Parameters

将螺旋锥齿轮的啮合过程离散为若干个曲面与平面的点接触过程,利用相似理论建立了等温点接触弹流润滑的相似模型。使用弹流润滑理论对相似模型进行了计算验证,分析了不同参数对系统相似性的影响。结果表明:在符合相似准则的前提下,仅改变卷吸速度和润滑油粘度对系统相似程度几乎没有影响;改变载荷、粘压系数、曲率半径和弹性模量时,系统相似误差变大;参数改变的越多,误差叠加效应越明显。根据相似模型合理选择参数,可在光干涉膜厚试验台上用低速、轻载的参数,间接测量螺旋锥齿轮接触区的油膜厚度及分布。最后将试验数据与相似性模型结果进行比较,发现卷吸速度小于1 m/s时,相似性模型结果与实验结果比较接近,最大误差12.82%;当卷吸速度变化较大时,相似性模型结果偏差较大。

The meshing process of the spiral bevel gear was simplified to the point contact between several curved surfaces and a plane.A similarity model subject to elastohydrodynamic lubrication was established by using the similarity theory.The model was then verified by the elastohydrodynamic lubrication theory.The influence of the different parameters on the system similarity was investigated.The analysis results show that under the premise of meeting the similar criteria,changing the entrainment speed and the viscosity of the lubricating oil has little influence on the similarity degree;When the load,the pressure-viscosity coefficient,the radius of curvature and the elastic modulus are changed,the similarity error of the system becomes larger;the more the parameters change,the more obvious the error stacking effect is.Selecting the parameters reasonably according to the similarity model,the film thickness and its distribution in the meshing zone of the spiral bevel gear pair can be indirectly measured by the optical interferometry method.Finally,the experimental data were compared with the similarity model results.The result shows that when the entrainment speed is less than 1 m/s,the similarity model results are close to the experimental results,and the maximum error is 12.82%;when the entrainment speed changes greatly,the similarity model results have large deviations.