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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >The Influence of Cam-Follower Motion on Elastohydrodynamic Film Thickness
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The Influence of Cam-Follower Motion on Elastohydrodynamic Film Thickness

机译：凸轮跟随运动对弹性流体动力膜厚度的影响

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During operation, cam-follower contacts experience a complex combination of cyclically-varying speed, load and geometry. In practical terms, the variation in speed is particularly significant, since it results in a large variation of both entrainment and sliding velocity with a corresponding variation of elastohydrodynamic film thickness and friction. At some points in the cycle the entrainment velocity and thus the theoretical, steady-state film thickness falls to zero. In most cam performance analyses, elastohydrodynamic film thicknesses are determined from steady state film thickness equations, with no account being taken of possible acceleration or squeeze effects. The aim of the current paper is to test the validity of this approximation. To do this, cam-follower kinematic cycles are simulated to a partial extent in a model ball on disc, optical interferometric test apparatus. Elastohydrodynamic film thickness is measured round the cycle using a combination of ultra-thin film interferometry and a high-speed, solid-state camera, to obtain high accurate film thickness measurements at 1 ms intervals. No attempt is made to vary the load and the contact radius and this represents the major simplification of the full cam-follower problem. The results show that the central film thickness departs consistently from the predicted, steady-state value at some points in the operating cycle, which indicates that squeeze effects play an important role in the lubrication of this type of mechanism. It also was found that a finite lubricant film was retained even in the positions where the entrainment speed fell to zero.
机译：在运行过程中，凸轮从动触点会经历速度，负载和几何形状的复杂变化。实际上，速度的变化特别重要，因为它会导致夹带和滑动速度都发生较大变化，而弹性流体动力膜的厚度和摩擦也会发生相应的变化。在循环的某些点上，夹带速度以及理论上的稳态薄膜厚度均降至零。在大多数凸轮性能分析中，弹性流体动力膜厚度是根据稳态膜厚度方程式确定的，没有考虑可能的加速或挤压效应。本文的目的是测试这种近似的有效性。为此，在圆盘光学干涉测试仪上的模型球中模拟凸轮跟随器的运动周期。使用超薄膜干涉仪和高速固态照相机的组合在整个周期内测量弹性流体动力学薄膜厚度，从而以1 ms的间隔获得高精度的薄膜厚度测量值。没有试图改变负载和接触半径，这代表了整个凸轮从动件问题的主要简化。结果表明，在工作循环中的某些点，中心膜厚度始终偏离预测的稳态值，这表明挤压效应在此类机构的润滑中起着重要作用。还发现即使在夹带速度下降到零的位置也保留了有限的润滑膜。

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