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research-article

Design of three new cam based constant-force mechanisms

[+] Author and Article Information
Javier Lopez Martinez

Department of Engineering, University of Almería, Spain
javier.lopez@ual.es

Daniel García Vallejo

Department of Mechanical Engineering and Manufacturing, University of Seville, Spain
dgvallejo@us.es

Francisco Manuel Arrabal Campos

Department of Engineering, University of Almería, Spain
fmarrabal@ual.es

José Manuel García-Manrique

Department of Civil Engineering, Materials and Manufacturing, University of Málaga, Spain
josegmo@uma.es

1Corresponding author.

ASME doi:10.1115/1.4040174 History: Received January 18, 2018; Revised April 26, 2018

Abstract

Constant-force mechanisms are designed to keep a constant or nearly constant input force along a prescribed stroke of the mechanism. The implementation of this kind of mechanisms has been approached in literature using compliant mechanisms or through a certain combination of springs and nonlinear transmissions. In this work, three new constant-force mechanisms based on the use of springs, rollers and cams are presented and analysed. The rolling friction forces between the rollers and the cam are included in the force equilibrium equations and considered in the integration of the cam profile. The influence of the friction force on the input force as well as the design parameters involved is studied based on numerical techniques and simulations. In fact, the results evidence that to obtain a precise constant-force mechanism, rolling friction forces must be considered in the cam profile definition. The main design guidelines for the three constant-force mechanisms proposed are described.

Copyright (c) 2018 by ASME
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