Abstract
The load distribution in the ball screw, when the nut is loaded by the moment, is analyzed theoretically considering the bending deformation of the screw shaft. And the results are compared with the previously reported results which are obtained when the deformation of the screw shaft is not considered, moreover the results are ascertained experimentally by the photo-elasticity using two dimensional ball screw model. In brief, the obtained results in this paper are as follows.
(1) Distributed loads in the ball screw are greater by 10% in maximum than the loads calculated from the linear approximate equation, and the bending deformation of the screw shaf t exerts great influence upon the distributed load acting on the ball of the nut end.
(2) An increase of shaft diameter and a decrease of screw lead are effective to reduce the maximum distributed load in the ball screw.
(3) For the purpose of reducing the distributed load in the ball screw, it is desirable to make the radial loads act on the ball screw regarding to the nut symmetrically, and if possible to diminish the moment load acting on the ball screw.
