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Technical Briefs

Analytical and Experimental Study of Conical Telescoping Springs With Nonconstant Pitch

[+] Author and Article Information
Manuel Paredes

INSA, UPS, Mines Albi, ISAE; ICA
(Institut Clément Ader),
Université de Toulouse,
135, avenue de Rangueil,
Toulouse F-31077, France
e-mail: manuel.paredes@insa-toulouse.fr

Contributed by the Design Automation Committee of ASME for publication in the Journal of Mechanical Design. Manuscript received April 27, 2012; final manuscript received May 2, 2013; published online July 2, 2013. Assoc. Editor: Matthew B. Parkinson.

J. Mech. Des 135(9), 094502 (Jul 02, 2013) (7 pages) Paper No: MD-12-1224; doi: 10.1115/1.4024721 History: Received April 27, 2012; Revised May 02, 2013

Most research papers that exploit conical springs focus only on conical springs with a constant pitch. In order to increase the range of possibilities for designers, this paper proposes a study of conical springs with other types of spirals projected on the conical shape. This study is related to three other types of conical springs: with a constant helix angle, with a constant stress at solid and with a fully linear load-length relation. For each spring, we give the equation of the spiral, the formula of the initial stiffness, and formulae to calculate the nonlinear part of the load-length relation for fully telescoping springs. We also report an experimental study performed to analyze the accuracy of the proposed study based on springs made by fused deposition modeling.

FIGURES IN THIS ARTICLE
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Copyright © 2013 by ASME
Topics: Stress , Springs
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Figures

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Fig. 1

Parameters of a conical spring

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Fig. 2

Parameterization of the helix

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Fig. 3

Detail of the helix of each conical spring

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Fig. 4

Load-length relations obtained

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Fig. 5

CAD model and geometry obtained

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Fig. 6

Detail of end coil design related to D2

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Fig. 7

Experimental tests of cylindrical springs

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Fig. 8

Experimental tests of conical springs

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