ISSN   1004-0595

CN  62-1224/O4

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油-气润滑流动行为对点接触副摩擦特性的影响

Influence of Oil - Air Lubrication Flow Behavior on Frictional Characteristics of Point Contact

  • 摘要: 油-气润滑技术已经广泛应用于常规零部件润滑设计中,通过合理制定润滑工艺方案,能有效减小接触副之间的摩擦,达到最佳润滑状态. 选用45钢圆盘和GCr15球作为摩擦副材料,在MFT-3000摩擦磨损试验机上开展球-盘点接触副油-气润滑试验,同时结合油-气润滑流场数值模拟考察喷射方位、供油量和供气速度等不同润滑参数对点接触副摩擦特性的影响规律. 结果表明:合理的喷射方位下点接触区域油相分布较为均匀,并有利于压缩气体将润滑油以微油滴形式喷射至摩擦副表面,润滑油滴与摩擦副表面发生碰撞、黏附和铺展等作用后形成油膜层,从而降低摩擦系数,提高润滑性能;供油量和供气速度对空间流场油相分布影响较为明显,在一定范围内,供油量的增加和适当的供气速度均能够改善油-气润滑效果.

     

    Abstract: Oil-air lubrication technology has been widely used in conventional component lubrication design. By formulating the lubrication process plan properly, the friction between the contact pairs can be effectively reduced to achieve the best lubrication state.The 45 steel disk and GCr15 ball were used as friction pair materials to carry out point contact oil-air lubrication experiment on an MFT-3000 friction and wear tester. In addition, the influence of lubrication parameters (e.g. injection orientation, oil supply and air supply speed) on the frictional characteristics of point contact was investigated by numerical simulation of oil-air lubrication field. The results show that under the reasonable injection orientation, the distribution of oil phase in the point contact area was more uniform and beneficial for the compressed air to spray the lubricating oil to the surface of the friction pair by the form of micro oil droplets. After collision, adhesion and spreading with the surface of friction pair, the oil film layer formed so that it can reduce the friction coefficient and improve the lubrication performance. The influence of oil supply and air supply rate on the oil phase distribution in the space flow field was obvious. Within a certain range, the increase in oil supply and the appropriate air supply speed improved the oil-air lubrication effect.

     

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