A torsion spring (also called a torsion spring, or simply a torsion spring) is a type of helical spring that generates torque or rotational force. The ends of a torsion spring are fixed to other components, and when those components rotate about the spring's center, the spring pulls them back to their initial position. Although called a torsion spring, it is subject to bending stress rather than torsional stress. Torsion springs can store and release angular energy or statically fix a device by rotating a lever arm about the spring's central axis.
Configuration: Torsion springs are designed with tightly contacting coils to promote rotation and generate angular restoring force. Various lever arm configurations are available, allowing for different ways of fixing the spring. For torsion springs, lever arm specifications to consider include the lever arm angle, equal lever arm length, and lever arm retraction type. When the spring is straight or parallel on the same side, the lever arm angle is considered 0°, increasing along the non-rotational direction. Lever arm retraction types include straight torsion, straight offset, hinged, short hook retraction, and hook retraction. To meet application requirements, you can bend, twist, or shape the end of a torsion spring into a hook or loop.
Applications: Common applications of torsion springs include clothing pins, notepads with paper clips, back panels, and garage doors. Torsion springs are also used in hinges, balancers, and grip reset mechanisms. These springs come in a wide variety of sizes, from miniature springs for electronic devices to large springs for seat controllers. Load should be applied to the spring according to its direction of rotation; rotating the spring from a position other than its free position is not recommended. As the spring rotates, its diameter shortens and its body lengthens. This needs to be considered when design space is limited. Torsion springs perform best when supported by a rod or tube. Designers should consider the effects of friction and lever arm deflection on torque.
