Torsion springs are a type of coil or helical spring used to apply a torque or store rotational energy and subsequently release it. The two most common types are single and double torsion springs.
This type of spring is 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 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.
Torsion Spring Applications:
- Window shades
- Counterbalance mechanisms
- Hinges and various other 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.
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