On The Thermal Load Carrying Mechanism Of Lubricated Parallel Gaps

The thermal load carrying capacity of parallel gaps was studied mainly in this thesis. It includes five parts, namely: (1) analysis on the thermal load carrying mechanism of infinitely long slider; (2) analysis on the thermal load carrying mechanism of finitely long rectangular slider; (3) a study of the influence of big-dimension surface textures upon the load carrying capacity of finitely long rectangular slider; (4) the experiment of the finitely long rectangular slider lubrication; and (5) a research for the effects of thermal boundary conditions on the elastohydrodynamic lubrication (EHL) in point contacts.First of all, starting from the simplest problem, the thermal load carrying mechanism of infinitely long slider was explored. Focus on the parallel gaps, four classes of temperature boundary conditions were employed to the analyses, and some interesting conclusions were obtained.Secondly, similar to the research on the infinitely long slider, the thermal load carrying capacity of finitely long rectangular slider was investigated. The interesting results provide a possibility for the design of a new type of bearings.Then, the influence of big-dimension surface textures on the thermal load carrying capacity of rectangular slider was studied theoretically, providing engineers more knowledge for the anti-wear and antifriction mechanism of surfaces textures.Furthermore, the correctness of the codes designed for the studies in this thesis was validated through an experiment using the available testing rig in our laboratory.Finally, the relation of the load carrying capacity of the piont contact elastohydrodynamic lubrication, in which the gap is approximately parallel, and the thermal boundary conditions was researched in the thesis. Three classes of temperature boundary conditions, which can lead convergent thermal EHL solutions, were chosen to study the thermal EHL behavior. The obtained solutions were then compared with the solutions predicted by the traditional natural boundary conditions, and hence the mechanism of thermal viscosity wedge was insighted more deeply.