Cylindrical helical springs made of round wire. Quality specifications for cold coiled compression springs

2009 ◽  
Keyword(s):  
Helical Springs ◽  
Quality Specifications ◽  
Round Wire ◽  
Compression Springs

The Effect of Presetting Helical Compression Springs

1960 ◽  
Vol 82 (1) ◽  
pp. 41-44 ◽  
Author(s):  
T. J. Atterbury ◽  
W. B. Diboll
Keyword(s):  
Carrying Capacity ◽  
Cyclic Load ◽  
Strain Curve ◽  
Slight Modification ◽  
Load Carrying Capacity ◽  
Fatigue Load ◽  
Stress Strain Curve ◽  
Helical Springs ◽  
Load Carrying ◽  
Compression Springs

A procedure for predicting the increase in fatigue load carrying capacity due to presetting helical springs is developed, based on the actual stress-strain curve of a material. Reasonable correlation with experimental results is obtained. For the cyclic load conditions and the material chosen, an increase in load carrying capacity of 21 per cent was observed. It is expected that an increase of approximately 40 per cent could be realized with slight modification of fabrication techniques.

Nomograms for the design of light weight hollow helical springs

2016 ◽  
Vol 231 (23) ◽  
pp. 4388-4394 ◽  
Author(s):  
William J Bagaria ◽  
Ron Doerfler ◽  
Leif Roschier
Keyword(s):  
Maximum Shear Stress ◽  
Extreme Temperature ◽  
Helical Spring ◽  
Transportation Fuel ◽  
Suspension Spring ◽  
Helical Springs ◽  
Fuel Savings ◽  
Suspension Systems ◽  
Round Wire ◽  
Trial And Error Method

The helical spring is a widely used element in suspension systems. Traditionally, the springs have been wound from solid round wire. Significant weight savings can be achieved by fabricating helical springs from hollow tubing. For suspension systems, weight savings result in significant transportation fuel savings. This paper uses previously published equations to calculate the maximum shear stress and deflection of the hollow helical spring. Since the equations are complex, solving them on a computer or spreadsheet would require a trial-and-error method. As a design aid to avoid this problem, this paper gives nomograms for the design of lightweight hollow helical springs. The nomograms are graphical solutions to the maximum stress and deflection equations. Example suspension spring designs show that significant weight savings (of the order of 50% or more) can be achieved using hollow springs. Hollow springs could also be used in extreme temperature situations. Heating or cooling fluids can be circulated through the hollow spring.

Analysis and Synthesis of Conical Coil Springs

2021 ◽  
Author(s):  
Harshkumar Patel ◽  
Hong Zhou
Keyword(s):  
Coil Spring ◽  
Spring Rate ◽  
Helical Springs ◽  
Compression Spring ◽  
Spring Wire ◽  
Coil Diameter ◽  
Constant Pitch ◽  
Analysis And Synthesis ◽  
Compression Springs ◽  
Mechanical Devices

Abstract Springs are mechanical devices that are employed to resist forces, store energy, absorb shocks, mitigate vibrations, or maintain parts contacting each other. Spring wires are commonly coiled in the forms of helixes for either extension or compression. Helical springs usually have cylindrical shapes that have constant coil diameter, constant pitch and constant spring rate. Unlike conventional cylindrical coil springs, the coil diameter of conically coiled springs is variable. They have conical or tapered shapes that have a large coil diameter at the base and a small coil diameter at the top. The variable coil diameter enables conical coil springs generate desired load deflection relationships, have high lateral stability and low buckling liability. In addition, conical compression springs can have significantly larger compression or shorter compressed height than conventional helical compression springs. The compressed height of a conical compression spring can reach its limit that is the diameter of the spring wire if it is properly synthesized. The height of an undeformed conical coil spring can have its height of its spring wire if the spring pitch is chosen to be zero. The variable coil diameter of conical coil springs provides them with unique feature, but also raises their synthesis difficulties. Synthesizing conical coil springs that require large spring compression or small deformed spring height or constant spring rate is challenging. This research is motivated by surmounting the current challenges facing conical coil springs. In this research, independent parameters are introduced to control the diameter and pitch of a conical coil spring. Different conical coil springs are modeled. Their performances are simulated using the created models. The deflection-force relationships of conical coil springs are analyzed. The results from this research provide useful guidelines for developing conical coil springs.

General Dynamic Equations of Helical Springs With Static Solution and Experimental Verification

1987 ◽  
Vol 54 (4) ◽  
pp. 910-917 ◽  
Author(s):  
Yuyi Lin ◽  
Albert P. Pisano
Keyword(s):  
Pitch Angle ◽  
Static Solution ◽  
Dynamic Equations ◽  
Compression Force ◽  
Variable Pitch ◽  
Helical Springs ◽  
Variable Helix ◽  
Wire Cross Section ◽  
Compression Springs ◽  
General Dynamic

The general dynamic equations of helical compression springs with circular wire cross section, variable pitch angle, and variable helix radius are derived. The equations are formulated by Hamilton’s principle and a variational method. In contrast to previous studies, the effects of coil flexure bending, variable pitch angle and variable helix radius are taken into account. The general equations are shown to agree with dynamic equations found in literature when the general equations are reduced to simplified forms. For a specific helical spring and static loading, the equations are solved with both the predicted radial expansion and the predicted longitudinal spring compression force in excellent agreement with experimental data.

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