【摘要】 在自行研制的模拟航天轴承的摩擦力试验机上,对4129航天润滑油进行了摩擦特性分析。对该润滑油在实际高低温工况下的黏度进行了测量。分析了温度、滚动速度和滑动速度与该油摩擦系数的关系,建立了该航天润滑油的黏温模型、摩擦系数计算模型。研究结果表明:当温度小于0℃时,4129航天润滑油黏度随温度的变化非常大;温度大于30℃时,其黏度随温度的变化较小。当滑动速度小于0.3 m/s时,该油摩擦系数随滑动速度近似线性增加;当滑动速度大于0.3 m/s时,摩擦系数随着滑动速度的增加呈非线性增加;当滑动速度大于1 m/s之后,摩擦系数随滑动速度增加基本保持不变。摩擦系数随油温的增加而减小。当滚动速度从1 m/s增加到3 m/s时,油的摩擦系数迅速下降,随着滚动速度继续增加,摩擦系数下降缓慢直到达到最小值,然后基本保持不变。更多还原

【Abstract】 The frictional characteristics of a space lubricating oil No. 4129 are tested by using the selfmade friction test rig which can simulate the frictional characteristics of aerospace bearing. The viscosity of this oil is measured by the kinematical viscometer at the high and low temperatures. The effects of the temperature,rolling speed and sliding speed on the friction coefficient are analyzed. A viscosity-temperature model and a frictional characteristic model are established. The results show that its viscosity varies considerably when the temperature is below 0 ℃,and its viscosity varies slowly when the temperature is above 30 ℃. When the sliding speed is less than 0. 3 m /s,the friction coefficient of this oil varies linearly with the sliding speed. When the sliding speed surpasses 0. 3 m /s,the friction coefficient varies nonlinearly with the sliding speed. When the sliding speed surpasses 1 m /s,the friction coefficient remains about the same with the increase in sliding speed. The friction coefficient decreases with the increase intemperture. When the rolling speed increases from 1 m /s to 3 m /s,the friction coefficient decreases quickly. Then the friction coefficient decreases slowly until it reaches the minimum value and keeps unchanged with the increase in rolling speed.更多还原