Axial Displacements in Ball Screw Mechanisms with Two and Four Contact-Point

Penkov, I.; Aleksandrov, D.
November 2011
International Review of Mechanical Engineering;Nov2011, Vol. 5 Issue 7, p1213
Academic Journal
The article discusses a calculation procedure for determining the load distribution on the threads of a ball screw under general load condition. The equations for calculating of axial load distribution for two types of loading are presented. The factors influencing the pliability of threads are calculated and their dependence on the pressure angle between balls and elements of transmission is shown. The value of the increment of pressure angle is calculated and the load distribution in a ball screw and a sliding screw is shown. For the ball screw the change of loading for constant and variable pressure angles are considered. Ball screw mechanisms with two and four contact-point rolling elements are considered and equations for calculating of bending and shearing deformations are presented. Radial deformations from contact forces are considered and a simple method for analysis of contact deformations between the balls, screw and nut of the transmission is shown.


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