Design of Constant Force Compliant Mechanisms

Design of Constant Force Compliant Mechanisms
Authors : Minhaz Ur Rahman, Hong Zhou
Publication Date: 01-07-2014


Author(s):  Minhaz Ur Rahman, Hong Zhou

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Vol. 3 - Issue 7 (July - 2014)

e-ISSN:   2278-0181


Compliant mechanisms realize mechanism functions by utilizing the elastic deformations of flexible components rather than the relative motions of rigid joints. The advantages of compliant mechanisms stem from the removal or replacement of rigid joints, which include the elimination of backlash, friction, wear and lubrication, the reduction of vibration and noise, the decreased manufacturing and assembly cost, and the increased precision. Because of the integrated motion and force behavior and the nonlinearities of large deformations, designing compliant mechanisms is much more challenging than rigid mechanisms. Constant force compliant mechanisms produce an output force that does not change for a large range of input motion and have many different applications. A method is introduced in this paper for designing constant force compliant mechanisms. A designed constant force compliant mechanism is modelled as a network of variable width spline curves which are defined by their interpolation circles. The design of constant force compliant mechanisms is systematized as optimizing the independent parameters of the variable width spline curves. The presented method is demonstrated by the design of a constant force compliant mechanism in the paper.


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