Helical springs used to apply a torque or store rotational energy are commonly called Torsion Springs. The two most common types are single and double bodied springs. Torsion springs are found in clothespins, window shade, counterbalance mechanisms, ratchets and various types of machine components. They are also used as couplings between concentric shafts, such as in a motor and pump assembly. Torsion springs are generally mounted around a shaft or arbor, and must be supported at three or more points.
Various kinds of ends are available to facilitate mounting. The type of ends on torsion springs should be carefully considered. While there is a good deal of flexibility in specifying special ends and end forming, the cost may be increased and a tool charge incurred.
Torsion springs are stressed in bending. If possible a torsion spring should always be loaded in a direction which decreases the body diameter. The residual forming stresses are favorable in this direction, but unfavorable when the spring is loaded in a direction the increases body diameter. Unless there are unfavorable residual stresses in the end bends, spring makers normally heat these springs at a low temperature to stabilize the end positions rather than fully stress relieve them. If the direction of loading tends to increase body diameter, then the spring maker will usually stress relieve them fully.
Back to Products