轴向受载的高速球轴承的拟动力学分析

提出了对仅受轴向载荷的高速球轴承进行拟动力学分析以掌握滚动元件运动特性的方法。首先确定了钢球和套圈的滚动速度以及套圈相对于钢球的滑动速度，建立了各滚动元件的润滑模型，阐述了建立高速球轴承运动特性分析基本方程的一般原理。通过求解这些基本方程可得到高速球轴承中各滚动元件的运动状态、受力情况、弹流油膜厚度和疲劳寿命，从而可确定高速球轴承不打滑的最小轴向力。

QUASIDYNAMIC ANALYSIS OF HIGHSPEED THRUST BALL BEARINGS

A quasi-dynamic analysis of high-speed thrust ball bearings is proposed to predict the kinematic characteristics.The rolling velocity and relative sliding velocity of each point in contact zone of balls and rings in a ball bearing are determined at first.According to the elastohydrodynamic and hydrodynamic lubrication theories,the reactions between the rolling pairs and the effects of heat and oil starvation on the thickness of oil film are considered.Then the principles for setting up the basic equations of the balls,the cage and the inner ring are established for the quasi-dynamic analysis of the thrust bearings.The kinematic characteristics,the load distribution,the thickness of the oil film and the fatigue life of the ball bearings can be obtained from solution of those equations.It is shown that the rotary speeds of the cage and the balls decrease and their skiddings become serious as the thrust goes down,especially to a small value.So the minimum thrust preload for prevention of skidding of the balls on the inner race can be estimated.