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首页> 外文会议>29th Leeds-Lyon Symposium on Tribology Sep 3-6, 2002 University of Leeds, UK >Dynamic Effects in EHL contacts
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Dynamic Effects in EHL contacts

机译：EHL联系人中的动态效果

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摘要

Virtually all EHL contacts operate under conditions where the load, surface velocities and contact radii change with time. In gears the load, slip and effective contact radius change over the tooth meshing cycle; in cams the surface velocities, load and contact radii change, often very rapidly, during cam rotation while in rolling element bearings the load changes continuously as the balls or rollers rotate around the track but may change mor.e rapidly if the external load alters. Predictions of film thickness (and pressure distribution) are relatively straightforward when conditions are constant but under dynamic conditions a separate, lengthy EHL analysis is required for each situation. This paper explores dynamic effects in EHL contacts and attempts to define criteria that can be used to decide where steady state results will give reasonable estimates of the contact's behaviour and where a more detailed analysis is required. It examines the way in which clearances and pressures change when the contact conditions alter. Detailed results are presented showing the effect of changing the entrainment velocity and load. It is shown, for example, that sudden increases in load produce large, localised increases in film thickness and significant increases in the maximum hydrodynamic pressure and stress. It is also shown that high frequency load variations can produce very large changes in clearance, maximum pressure and contact stress. Use of a quasi steady state analysis in these types of situation could overestimate the minimum film thickness and underestimate the maximum stress.
机译：实际上，所有EHL触点都在负载，表面速度和触点半径随时间变化的条件下运行。在齿轮中，载荷，滑移和有效接触半径在齿啮合周期内变化；在凸轮中，凸轮旋转时，表面速度，载荷和接触半径通常非常迅速地变化，而在滚动轴承中，载荷随着球或滚子绕轨道旋转而连续变化，但是如果外部载荷发生变化，则载荷可能会迅速变化。当条件恒定时，薄膜厚度（和压力分布）的预测相对简单，但在动态条件下，每种情况都需要单独的冗长的EHL分析。本文探讨了EHL接触中的动态影响，并尝试定义标准，这些标准可用于确定稳态结果将在何处对接触器的行为提供合理的估计，以及在何处需要进行更详细的分析。它检查了接触条件改变时间隙和压力的变化方式。给出了详细的结果，显示了改变夹带速度和载荷的影响。例如，表明负荷的突然增加会导致薄膜厚度局部较大地增加，并且最大流体动力压力和应力会显着增加。还表明，高频负载变化会在间隙，最大压力和接触应力方面产生很大的变化。在此类情况下使用准稳态分析可能会高估最小膜厚，而低估最大应力。

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