| With the development of modern machinery, people began to pursue higher mechanical accuracy, faster m echanical speed. Accuracy requirem ents are precision and s tability of machine in the process of running. Rate re quirements is to continuously im prove the operating speed of the machine. Progress of these two aspects are inseparable from the role of bearing. A reasonable design on bearing m akes the beari ng substantially increase its lubricating ability that improves the mechanical accuracy and speed to maximize economic benefits.In the bea ring lubrication process, the st ate of the lubricant oil-f ilm will change according to the chang e about operating worki ng conditions, lubricant injection rate and external load. In the oil-film status change, p roblem of oil-film failure is m ost likely to occur. Change speed and external load cause th e partial pressure of the oil f ilm to grow exponentially. Increasing pressure causes film rupture to make the rotor a nd rings of the bearing direct contact. When they are in d irect contact,the friction and wear change occur. Understanding and analyzing the reasons for th e failure of the film, and researching on mechanical speed, speed of oil, ex ternal load on the oil f ilm failure, make us to take effective measures to prevent and stop the rolling ball bearing lubrication failure.In chapter two, bearing lubrication theory is derived and simplified in detail. Boundary conditions for the selection is described. And the discretization m ethod, solution method, mesh generation m ethod are described. In ch apters three&four, the three-dim ensional numerical simulation of cavity film distribution of rolling is a starting point to study the comparative analysis about the affect that mechanical speed, speed of oil and external load on the bearing lubricant stability in the process of lubricati ng bearing. Finally, this paper describes the experimental work, the error between experimental data and simulation data is studied. |
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