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.

Copyright © 2013 by ASME
Topics: Stress , Springs
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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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