Abstract
The stiffness of a ball screw is dominated roughly be Heatzian contact between the balls and the guiding grooves. However, the calculated values are always higher compared with experimental values. hence, to derive more exact values, the elastic deformation of the screw shaft, the nut itself and screw thread are taken up in addition to the deformation due to Hertzian contact. The load distribution in a ball screw is also examined. The load distribution changes with the load condition of the screw and the row number of thread turn. However, nonuniformity of the load distribution is not so remarkable. The deformation of a screw thread has a slight influence on the load distribution, but it gives a certain effect on the stiffness. The stiffness obtained here approaches experimental values compared with the values based on Hertzian contact.
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