A torsion spring is designed to undergo deformation by mechanical energy of torsion, rotation, bending or flexion. Thanks to the shape memory of its specific material, it can restore this energy in order to return to its original dimension. The torsion spring has the specificity of exerting a rotating force in action and then a reverse rotation in order to return to its rest position.
Apart from the specificity of its ends, the torsion spring is identical to coil springs. It depends on the use of bending, folding, rotation or torsion. It is in rest function when there is no contact with the ends.
The torsion spring operates rotatively according to an angle. It accumulates and releases energy through the angle when the sides are deformed relative to the body.
The torsion spring can be used for several purposes, including :
The force exerted must be in the direction of the winding. Its deformation conditions depend on the angle of rotation and the ends.
The bending stresses are mainly in the spring body. The space in which the torsion spring evolves must be taken into account because the torsion spring, depending on its condition, changes volume. During use, the body length increases but the diameter decreases. At rest, it has a smaller body and a larger diameter. The smaller the winding angle, the more difficult it will be for the spring to perform bending work.
To make a spring there are criteria common to all spring families such as wire diameter, outer diameter, body length, number of turns, stiffness and material.
For the parameters specific to the torsion spring there is the angle of the branches :
Et les types d'extrémités :
These two types of ends are the most commonly used, they are the basic ones. However, there are many others because the wire can then be formed at the customer's request.