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以TMT三镜系统为对象,对其中的Rotator组件用轴承进行了设计,并对轴承关键参数的选取进行了探讨。首先,通过分析三镜系统的运动模式确定了系统的受载状态;接着基于Hertz弹性变形理论,建立了双列角接触球轴承的载荷-变形公式,采用牛顿迭代法对轴向、径向、角位移量进行求解,得到每个钢球受载和变形的精确解;最后对该轴承设计中的一些关键参数选择对承载能力的影响进行了讨论。计算分析表明,在三镜工作角度范围内,光轴方向最大变形为0.022 mm,滚道面内各个方向变形小于0.042 mm,最大角变形量为3.5″,满足三镜系统的设计要求,并留有较大的设计裕度。建立的载荷分布方程及提出的参数选择原则对双列角接触球轴承的设计具有通用性,可适用于各种工况。
Taking the TMT three-mirror system as an example, the Rotator component in the system is designed with bearings and the selection of the key parameters of the bearing is discussed. Firstly, the loaded state of the system is determined by analyzing the movement patterns of the three mirror system. Then based on the Hertz elastic deformation theory, the load-deformation formula of double row angular contact ball bearings is established. The Newton iteration method is used to calculate the axial, radial, The angular displacements are solved to get the exact solution of each steel ball loading and deformation. Finally, the influence of the selection of some key parameters on the bearing capacity of the bearing design is discussed. The calculation and analysis show that the maximum deformation in the direction of optical axis is 0.022 mm, the deformation in all directions in the raceway plane is less than 0.042 mm and the maximum angular deformation is 3.5 "within the operating range of three mirrors, which meets the design requirements of the three-mirror system and keeps A larger design margin.The established load distribution equation and the proposed principle of parameter selection have commonality on the design of double row angular contact ball bearings and can be applied to various working conditions.