【摘要】 为探究热弹流润滑条件下DLC涂层的减摩机制，构建考虑涂层的线接触弹流润滑模型，研究涂层厚度、接触副材料及滑滚比变化时，尺度对接触区润滑性能的影响。结果表明：在热弹流润滑中尺度效应明显，当量曲率半径较大时，随着当量曲率半径的增大，油膜厚度增大，计入涂层后，膜厚减小，油膜中层温度升高，摩擦因数减小；但当量曲率半径较小时，计入涂层有增摩效果；在研究的当量曲率半径范围内，添加薄涂层的接触副摩擦因数最小，减摩性能最好。相同工况下，无论是否添加涂层，在当量曲率半径较小时，受剪切影响润滑油的摩擦因数随滑滚比的增大而增大；当量曲率半径较大时，受热稀作用的影响，摩擦因数随滑滚比的增大而减小。更多还原

【Abstract】 To investigate the friction reducing mechanism of DLC coating under thermal elastohydrodynamic lubrication(EHL) condition,a line-contact EHL model incorporating coatings was developed. The scale effect on lubrication performance within the contact zone was investigated when varying parameters such as coating thickness,materials of contact pair,and slide-roll ratios. The results show that scale effects in thermal EHL are significant. For larger equivalent curvature radii,an increase in the film thickness is observed with increasing radius. However,when including the coating,there is a decrease in the film thickness along with an increase in mid-layer film temperature,and a reduction in friction coefficient. Conversely,for small equivalent curvature radii,coatings exhibit friction-increasing effects.Within the studied range of equivalent radii,contact pairs with thin coatings achieve the lowest friction coefficient,demonstrating optimal friction-reduction performance. Under identical operating conditions and regardless of coating presence,for smaller equivalent radii,friction coefficient of the lubricating oil increases with rising slide-to-roll ratio due to shear effects,whereas for large equivalent curvature radii,friction coefficient decreases with increasing slide-to-roll ratio owing to thermal thinning effects.更多还原