Load Distribution of Double Nut Ball Screws with Consideration of Geometric Errors and Overturning Moment#br#

doi:10.3969/j.issn.1004-132X.2021.10.006

Abstract

Abstract: A load distribution model of double nut ball screws was established by considering the geometric errors（ball size error, lead error and raceway profile error）and overturning moment. The force and displacement deformation curves of a typical 4010 ball screw were measured to verify the correctness of the theoretical model. The effects of axial loads, geometric errors and overturning moment on the load distribution of double nut ball screw were studied by simulation analysis. The results show that when the axial loads are of a constant, the overturning moment may cause the load distribution of double nut ball screws to deteriorate rapidly. The ball size errors and raceway profile errors may lead to the loads of the balls either increase or decrease. Due to the accumulation of the errors in the screw axial direction, the lead errors may lead to the increase of the load within one wide nut while the decrease of the load within the other side nut. When the error sizes keep constant, the influences of lead errors on the load distribution is greater than that of the ball size errors and raceway profile errors, namely the load distribution of double nut ball screws is more sensitive to the lead errors.

Key words: double nut ball screw, load distribution, ball geometric error, overturning moment

摘要： 建立了一种考虑几何误差（滚珠尺寸误差、丝杠导程误差和滚道齿形误差）和倾覆力矩的双螺母滚珠丝杠副载荷分布模型；通过试验测得4010型滚珠丝杠副的力与位移变形曲线，验证了理论模型的正确性；通过仿真分析研究了轴向外载荷、几何误差和倾覆力矩对双螺母滚珠丝杠副载荷分布的影响。研究结果表明：轴向外载荷一定时，倾覆力矩会导致双螺母滚珠丝杠副的载荷分布迅速变差；滚珠尺寸误差和滚道齿形误差会使双螺母滚珠丝杠副中滚珠的受载显著增大或减小；由于丝杠轴向误差累计的作用，导程误差会使双螺母滚珠丝杠副中一侧螺母受载增大，另一侧螺母受载减小；在误差大小一定的情况下，导程误差对载荷分布的影响程度大于尺寸误差和齿形误差，即双螺母滚珠丝杠副的载荷分布对导程误差的敏感度更高。

关键词: 双螺母滚珠丝杠副, 载荷分布, 滚珠几何误差, 倾覆力矩

CLC Number:

TH122

XI Jingyao, ZHOU Changguang, FENG Hutian, ZHANG Luchao. Load Distribution of Double Nut Ball Screws with Consideration of Geometric Errors and Overturning Moment#br#[J]. China Mechanical Engineering, 2021, 32(10): 1181-1190.

席静谣, 周长光, 冯虎田, 张鲁超. 几何误差和倾覆力矩对双螺母滚珠丝杠副载荷分布的影响#br#[J]. 中国机械工程, 2021, 32(10): 1181-1190.

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