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RESEARCH PAPERS

Design of the Ball Screw Mechanism for Optimal Efficiency

[+] Author and Article Information
M. C. Lin, S. A. Velinsky, B. Ravani

Department of Mechanical & Aeronautical Engineering, University of California—Davis, Davis, CA 95616

J. Mech. Des 116(3), 856-861 (Sep 01, 1994) (6 pages) doi:10.1115/1.2919460 History: Received March 01, 1990; Revised February 01, 1994; Online June 02, 2008

Abstract

This paper develops theories for evaluating the efficiency of the ball screw mechanism and additionally, for designing this mechanism. Initially, a quasi-static analysis, which is similar to that of the early work in this area, is employed to evaluate efficiency. Dynamic forces, which are neglected by the quasi-static analysis, will have an effect on efficiency. Thus, an exact theory based on the simultaneous solution of both the Newton-Euler equations of motion and the relevant kinematic equations is employed to determine mechanism efficiency, as well as the steady-state motion of all components within the ball screw. However, the development of design methods based on this exact theory is difficult due to the extensive computation necessary and thus, an approximate closed-form representation, that still accounts for the ball screw dynamics, is derived. The validity of this closed-form solution is proven and it is then used in developing an optimum design methodology for the ball screw mechanism based on efficiency. Additionally, the self-braking condition is examined, as are load capacity considerations.

Copyright © 1994 by The American Society of Mechanical Engineers
Topics: Screws , Design
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