水压环境下轴承支撑结构变形对其载荷分布的影响分析

Analysis of the Bearing Load Distribution Under Underwater Axial Structure Deformation

当水下轴承支撑在工作过程中受到外力作用时,轴承的内圈或外圈会产生偏离理想圆形的变形,因而需要考虑变形后的形状来获得真实的载荷分布,或者把轴承套圈视为柔性。针对水下回转轴承内圈与其中空支撑轴结构采用固联装配的情况,分析了海水压力作用下中空支撑轴变形引起的轴承内圈变形,以及由此引起的轴承间隙变化,建立了轴承负荷与滚动体负荷的平衡方程,通过数值仿真计算,得到变形后轴承内圈的载荷分布。计算结果表明,在水下压力环境下轴承内圈变形后与变形前的载荷分布截然不同。轴承的力学性能下降,将会影响轴承的使用可靠性及寿命。

To counter the external force such as water pressure when working underwater, either the inner or outer ring of the bearing may suffer deformation and is no longer a perfect circle. Thus, to obtain the actual load distribution on the bearing, it is imperative to study its deformed shape or to take its rings as flexible bodies. Aiming at the problem, this paper analyzes the deformation of the inner ring of a rotating bearing caused by the underwater axial deformation, and the change of bearing clearance when the inner ring is attached to a hollow axial structure. Based on these results, an equilibrium equation between the bearing loads and the rolling body loads is established. Then, the actual load distribution of the inner ring is obtained via numerical simulation. The results show that the load distribution on a deformed bearing is distinct from that on an intact one. Particularly, a deformed bearing has poorer mechanical performance, which could reduce its reliability and service life.