螺旋油楔轴瓦界面滑移现象分析

Analysis of Interface Slip of Spiral Oil Wedge Bush

针对螺旋油楔滑动轴承非金属材料轴瓦的界面滑移现象,基于极限剪应力模型得到轴瓦表面考虑周向和轴向滑移的数学模型,并运用有限差分法,研究了界面滑移对二维螺旋油楔滑动轴承周向压力、滑移速度、承载力、端泄量和摩擦阻力的影响.结果表明:考虑界面滑移时,螺旋油楔滑动轴承的周向压力、承载力和摩擦阻力有所降低,端泄量有所提高;偏心率的提高使初始极限剪应力临界值有所增加,即轴瓦表面更加不易发生界面滑移;螺旋角的提高对初始极限剪应力临界值的影响不大;滑移首先发生在封油面区域.

In order to investigate the interface slip of nonmetal bushes for the sliding bearing of spiral oil wedge,a mathematical model considering both the circumferential and the axial slips of bush surface is established based on the ultimate shear stress model.Then,with the help of the finite differential method,the effects of interface slip on the circumferential pressure,slip velocity,carrying capacity,end leakage and friction of the sliding bearing of a 2D spiral oil wedge are analyzed.The results show that interface slip may result in the increases of end leakage and the decrease of circumferential pressure,carrying capacity as well as friction,and that the threshold of the initial ultimate shear stress increases with the eccentricity,which prevents the interface slip from appearing on the bush surface.Moreover,it is found that the spiral angle has no obvious effect on the threshold of the initial ultimate shear stress and that the interface slip occurs first in the envelop zone.