Torsion Spring Information from a Spring Manufacturer
The basic design of torsion springs means that they exert pressure along a circular path—in other words, they provide torque. This may be confusing to users who look at the stresses of compression and extension springs and compare them to the stresses of a torsion spring, which are subject to “bending stresses”. A spring manufacturer may also create these torsion products under the product names of flat coil, motor, or power springs.
Often, a torsion spring is closed coiled, which means there is not space between the coils. As a result, variations in length occur when there is a variation in the wire’s diameter and the actual number of coils. It is also important to remember that when the spring is wound up onto one coil, it has increased in length by a wire size; for two coil winding, it increases by two wire sizes. Users will need to allow clearance of this extra length. Torsion springs should always activate their load in a direction that actually increases the diameter of the coils, but in a few applications the springs are activated by “unwinding” them. These applications are always performed with small travel under confined conditions that will prevent the end coils from bending outward. Finally, when a torsion spring is designed to operate by reducing coil diameter, the hub or shaft the spring operates over needs to be about 90% of the smallest inside diameter that the spring is reduced to. Without this good support, the spring will be prone to fail early.
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