高频循环载荷下球面滑动副摩擦学特征研究

试验研究了高频循环载荷对重型差速行星齿轮与球形垫片组成的球面接触副摩擦学性能的影响. 通过激励不同质量弹簧振子产生极限幅值不同的高频循环载荷，利用离散小波变换分析摩擦力曲线，并对磨损过程和垫片磨痕进行观测. 研究表明:摩擦力低频信号成分可表征高频循环载荷下滑动副的实时摩擦状态和变化趋势；幅值过高的高频循环载荷易导致球面垫片发生疲劳磨损、犁沟磨损、材料塑性流动和变形等多种磨损类型；激励作用对球面配副的摩擦学特征影响显著，易破坏摩擦副摩擦状态的稳定性，可以通过降低瞬时高频载荷幅值和激励强度改善球面滑动副的摩擦学性能. 

Tribological Performance Analysis of Spherical-Surface Sliding Pairs under High-Frequency Cyclic Loading

Effects of high-frequency cyclic loading on tribological properties of inner spherical-surface contacting pairs between the differential gear end-face and shell washer of heavy vehicles, were experimentally investigated. The high frequency cyclic loads with different extreme amplitudes were produced by exciting different spring-connecting weights. The friction force signals were analyzed by Discrete Wavelet Transform method. And the wear process and wear scars of the thrust washers were observed. Research indicated that the low-frequency signal components of the friction force signals under high-frequency cyclic loading can be used to assess the friction state and the variation tendency. The cyclic loading with extreme amplitude tended to produce different severe wear forms, e.g. fatigue wear, plowing damages, material side flow and plastic deformation. And the excitation of large cyclic loading had a very significant influence on the tribological performance of the spherical-surface mating pairs and was apt to break the frictional stability of the sliding pairs. Therefore, reducing the force amplitude and lessening the excitation magnitude improved the tribological properties of spherical-surface mating pairs.