Suspension springs - Understanding terminolgy

I recently did a seminar with Hyperco, and figured I'd put this stuff on paper before I forget. Hopefully this will help some to understand the terminolgy and functions of a coil spring a little better. I know it clarified it a bit for me.


Rate = lbs/in (all springs are rated at 1" of deflection)
Example: If a spring deflects by 2.75" under a load of 500 lbs, the rate would be calculated as follows:
500 / 2.75 = 182# rate

Load = Force exterted onto the spring
Example: A spring with a 182# rate and a deflection of 2.75", the load would be calculated as follows:
2.75 * 182 = 500 lb. load

Deflection = Travel of the spring
Example: A spring under a load of 500 lbs. and with a rate of 182#, the deflection would be caluclated as follows:
500 / 182 = 2.75" deflcection

Coil bind = Maximum deflection (when the coils go solid)

SO........

Rate = Load/Deflection

Load = Rate * Deflection

 

[Locke]

I'll add that these are generic spring terminologies, and will apply to valve springs as well.