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首页> 外文期刊>Mechanical systems and signal processing >Ball bearing skidding and over-skidding in large-scale angular contact ball bearings: Nonlinear dynamic model with thermal effects and experimental results
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Ball bearing skidding and over-skidding in large-scale angular contact ball bearings: Nonlinear dynamic model with thermal effects and experimental results

机译：大型角度触点球轴承的滚珠轴承滑动和过度滑动：具有热效应和实验结果的非线性动态模型

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摘要

From a kinematic point of view, rolling elements should continuously roll on the raceways of rolling element bearings. When the dynamic behaviour is also considered, pure rolling occurs if the bearing is properly loaded and the system is correctly lubricated. In the absence of these conditions, the rolling elements may slide, or skid, from time to time. In the literature, this behaviour is well documented and occurs generally for low-load roller bearings. During a long-lasting experimental test on a large-scale industrial angular contact ball bearing (ACBB), not only skidding behaviour but also so-called over-skidding behaviour was observed on the rolling elements of the bearing. The term over-skidding, or negative-skidding, means that the cage/rotor speed ratio exceeds the value calculated under pure rolling kinematic conditions. To the best of authors' knowledge, this phenomenon has not been fully described or analysed before. Therefore, a comprehensive model considering the kinematics of the bearing components, the Hertzian contact between the rolling elements and raceways, the interaction between the rolling elements and cage, the hydro-dynamic lubrication, and the thermal effects is introduced in this paper to study and forecast the over-skidding and skidding mechanisms. The model acronym is KH-THD, that is the kinematic-Hertzian-thermo-hydro-dynamic model. The empirical existence of over-skidding indicates that the use of the theoretical value for the cage/rotor speed ratio is inaccurate for determining whether the bearing rolling elements are slipping or not on the raceways, especially for large-scale industrial bearings. The results of the experimental tests on such kinds of bearings obtained by varying the load and under three different operating rotational speeds and two lubricant supply conditions suggest that the KH-THD model is more accurate than existing models, which neglect the thermal effects due to friction. The analysis of the friction thermal effects due to skidding shows that a considerable temperature gradient forms in the bearing. The increase in the lubricant flow rate can somehow mitigate the increase in temperature even though it can worsen the skidding. The proposed model is useful for determining this trade-off for a given load.
机译：从运动角度来看，滚动元件应在滚动元件轴承的滚道上连续滚动。当也考虑动态行为时，如果轴承正确装载并且系统正确润滑，则会发生纯轧制。在没有这些条件的情况下，滚动元件可能不时滑动或滑动。在文献中，这种行为有充分的记录，并且通常用于低负载滚子轴承。在大型工业角接触球轴承（ACBB）的持久实验测试中，不仅在轴承的滚动元件上观察到所谓的过滑动行为，而且还观察到所谓的过滑动行为。术语过滑动或负面滑动意味着笼/转子速比超过在纯轧制运动条件下计算的值。据作者所知，这种现象尚未在之前完全描述或分析。因此，考虑轴承部件的运动学的全面模型，滚动元件与滚路之间的赫兹接触，滚动元件与笼之间的相互作用，液压动态润滑和热效应，以研究和预测过度打滑和滑动机制。模型首字母缩略词是KH-THD，即KineMatic-Hertzian-Thermo-Dentro-DiveS-DiveS-DiveS-DiveS-DiveS。过度滑动的经验存在表明，用于确定轴承滚动元件是否在滚道上滑动的笼/转子速度比的理论值是不准确的，特别是对于大型工业轴承。通过改变负荷和三种不同的操作转速和两个润滑剂供应条件来获得的这种种类的轴承的实验测试结果表明，KH-THD模型比现有型号更准确，这忽略了由于摩擦引起的热效应。由于滑动引起的摩擦热效应的分析表明轴承中具有相当大的温度梯度形式。润滑剂流速的增加可以以某种方式减轻温度的增加，即使它可以恶化。所提出的模型对于给定负载确定该权衡是有用的。

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