Abstract
The theoretical analysis of the load distribution in the ball screw which is tension or compression preloaded was carried out, regarding the case that the tension and compression loads act on the screw shaft and nut respectively, and the tension acts on both shaft and nut, moreover the tension acts on shaft and both tension and compression act on nut. Then, the load distribution of the two dimensional ball screw model which is preloaded, was measured by means of photoelasticity experiments so as to ascertain the theoretical results. In brief, the obtained results are as follows.(1) When the tension and compression loads act on the shaft and nut of the preloaded ball screw respectively, it is advantageous to tension preload in the ball screw in order to uniform its load distribution.(2) A preloading system exerts a little influence upon the load distribution of ball screw when the tension load acts on the shaft and nut.(3) When the both tension and compression loads act on the nut simultaneously, it is advantageous to compression preload in the ball screw provided the shaft diameter is thick, while it is advantageous to tension preload provided the shaft diameter is thin.
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