TORSION SPRINGS

Helical torsion springs are used to apply a torque or store rotational energy are commonly referred to as torsion springs. The two most common types are single and double-bodied springs.

Torsion Spring Industry Use

Torsion springs are found in:

• Clothespins
• Window shades
• Counterbalance mechanisms
• Ratchets
• Hinges
• Machine components

They are also used as couplings between concentric shafts such as in a motor pump assembly. Torsion springs are generally mounted around a shaft or arbor, and must be supported at three or more points.

How does a torsion spring work?

Torsion springs are stressed in bending. If possible, a torsion spring should always be loaded in a direction that causes the body diameter to decrease. The residual forming stresses are favorable in this direction, but unfavorable when the spring is loaded in a direction that increases the body diameter. Unless there are unfavorable residual stresses in the end bends, spring makers normally heat-treat 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, the spring maker should be advised to stress-relieve the springs.

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