两类多油楔浮环轴承性能比较

Performance comparison between two kinds of multi-oil wedge floating-ring bearings

高速轻载机械常使用多油楔轴承,通过对三油楔浮环轴承和油楔个数是其两倍的六油楔浮环轴承动压油膜流体动力特性的计算和比较,判断出多油楔浮环轴承油楔个数及浮环对轴承性能的影响。多油楔浮环轴承不但边界复杂而且是多域问题,由于边界元方法不需要域内网格划分,只需边界离散,因而在处理复杂边界问题、多域问题时有其独特的优越性,计算工作量小,精度高。利用边界元方法计算了三油楔、六油楔两类浮环轴承的外油膜流场分布、轴承及浮环表面压力分布、e=0.03时轴承表面压力分布直观图、有无浮环时内摩擦损耗,并且对两类轴承的稳定性、承载能力及内摩擦损耗作了比较。通过对计算结果的分析和比较判断出在相同的偏心率下油楔个数的增加可以提高轴承的稳定性和承载力,加入浮环后可以减小轴承的内摩擦损耗。

Multi-oil wedge bearing is commonly used by high speed and light weight machine,by computation and comparison on the hydrodynamic characteristics of hydrodynamic pressure oil film of three-oil wedge floating-ring bearing with that of the six-oil wedge floating-ring bearing,the influence on the bearing performance by number of oil wedges and oil floating rings of multi-oil wedge floating-ring bearings.The multi-oil wedge floating-ring bearing is not only complicated with its bounder,but also a multiple-domain problem.Because the boundary element method does not need mesh division in the domain,only the discrete at the bounder is required.When coping with problems as complicated bounder and multi domains,there is unique advantages,and small computation and high in accuracy.By using the boundary element method,following computations for both three-oil wedge floating-ring bearing and the six-oil wedge floating-ring bearing have been carried out：the oil film flow field distribution,the surface pressure distribution of the bearing and floating ring,the pictorial diagram of bearing surface pressure distribution while e is equal to 0.03,internal friction loss with and without floating ring,the comparison on stability,bearing capability and internal friction loss of both these types of bearings was carried out.Through analysis and comparison on the computation results,it can be judged if the eccentricity is same,the stability and bearing capability of the bearing is increased when increasing the number of the oil wedges,and the internal friction loss of the bearing is reduced when adding in the floating ring.