Analysis of Self-Braking Criteria from the Viewpoint of Their Validity

Authors: Timofeev G.A., Samoilova M.V., Panyukhin V.V. Published: 20.11.2013
Published in issue: #4(93)/2013  


Category: Design  
Keywords: self-locking, mode of unloking, friction forces, kinematic pairs, mechanism, forward and reverse motion, efficiency

A notion of self-locking and the known analytical and geometric criteria of this phenomenon are analyzed. It is offered to study the self-locking phenomenon using the parameter of link locking, which is equal to a ratio of elementary works of internal friction forces to the driving forces taken with an alternate sign. The selflocking definitions and classifications by many researchers are critically analyzed; a fundamentally different view to such mechanisms is proposed which consists in the fact that they do not form an individual class of mechanisms because the self-locking effect is inherent in all mechanisms with certain geometric parameters and under certain motion conditions. Highly effective constructions of self-locking mechanisms are described. It is shown that the efficiency can be used neither as a self-locking criterion nor for estimation of its reliability because it loses the physical meaning during the self-locking. The results of analysis of self-locking criteria expand knowledge about this phenomenon and will help the new-technology developers to use them in designing the self-locking mechanisms.


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