飞轮轴承润滑最佳油量的估算方法及实验验证

卫星姿控飞轮通常采用一对精密油润滑角接触球轴承进行旋转支撑.由于飞轮长寿命、高可靠、高精度要求和独特的空间环境,轴承采用微量油润滑.润滑油过多和不足都将导致飞轮轴承摩擦力矩增大和寿命降低,因此存在轴承润滑最佳油量.基于弹流润滑理论,提出了飞轮轴承润滑最佳油量的理论计算方法,并通过球-盘摩擦副进行实验验证.实验结果验证了飞轮轴承润滑最佳油量理论计算方法的有效性.

Method to Estimate the Optimum Quantity of Lubricating Oil in Flywheel Bearing and Its Experimental Verification

The flywheels in a satellite attitude control system usually use a pair of oil-lubricated precise angular-contact ball bearings as the rotary support. Because of the requirements for long life, high preci- sion and high reliability of flywheels and special space environment, the lubrication of bearings uses mi- cro-quantity oil. Either over-flooded lubrication or starved lubrication can result in the increase of friction torque and decrease of the life of flywheel bearing. So there exists an optimum quantity of lubricating oil. We give a method to estimate the optimum quantity of lubricating oil in the flywheel bearing based on the elastohydrodynamic lubrication （EHL） theory. Meanwhile, a ball-on-disk test is developed to simulate the bearing ball and raceway contact. The experimental results verify the validity of the proposed method.