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Torsion springs used in the reverse direction
2

Torsion springs used in the reverse direction

Torsion springs used in the reverse direction

(OP)
Does anyone have any experience on using torsion springs in the reverse direction. I know that it is not adviseable to do so, but are there any rules / formulas that apply to this type of operation?

Thanks, Jack

RE: Torsion springs used in the reverse direction

Not sure what you mean by reverse direction. I've created designs that utilize torsion springs in both the winding and unwinding directions depending upon the characteristics I was trying to exploit.

RE: Torsion springs used in the reverse direction

Hi jackpot

According to the "Spring Design Handbook" by Associated Srings:- Torsion Springs should be operated in a direction
         such that the body diameter tends to reduce in
         size. This is because the residual stresses due to
         forming are favourable when the spring is loaded in
         this manner.The converse of this is true if the    
         spring is operated in such a manner that the body
         diameter increases.
         With this latter case it is advised that the
         springs are stress relieved.


   regards
   
   desertfox

RE: Torsion springs used in the reverse direction

To add to desertfox, the stress concentration factor (Wahl factor) for torsion spring operated in a direction such that the body diameter tends to "increase" is higher than the the stress concentration factor (Wahl factor) for torsion spring operated in a direction such that the body diameter tends to "decrease". Therefore, a torsion spring that is loaded in both direction will be able to give lower torque than a torsion spring loaded only in one direction i.e. the direction that tends to decrease the body diameter.

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