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MD-8 Spring design

1 August 15, 2007 August 15, 2007118. 8. Spring designSpring designObjectivesObjectives Identify, describe, and understand principles of several types oIdentify, describe, and understand principles of several types of springs f springs including helical compression springs, helical extension springsincluding helical compression springs, helical extension springs, torsion , torsion tubes, and leaf Spring , and leaf Spring systems. design and analyze helical compression springs, including design and analyze helical compression springs, including compatibility with allowable with allowable stresses.

3 August 15, 2007 13 Fig. 8.6 Helical Compression Spring Design Free length, Lf Solid length, LS Deflection, δ August 15, 2007 14 Spring Rate Spring rate (k) is ratio of change in force to the change in length Force (F) exerted by the spring is F = k (Lf – Lo) Appendix 12 Standard spring selection L F k ∆ ∆ = Eq 8.1 Eq 8.2 August 15, 2007 15

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