Torsion springs have ends that are rotated in angular deflection which offers resistance to externally applied torque. The wire itself is subjected to bending stresses rather than torsional stresses, as might be expected from torsion springs. Torsion springs are usually close wound and reduce in coil diameter and increase in body length as they are deflected. The design of a torsion spring must consider the effects of friction and arm deflection on the torque.
Special types of torsion springs include double torsion springs and springs having a space between the coils to minimize friction. Double torsion springs consist of one right hand and one left hand coil section connected together, and working in parallel. The sections are designed separately with the total torque extended being the sum of the two.
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Special types of torsion springs include double torsion springs and springs having a space between the coils to minimize friction. Double torsion springs consist of one right hand and one left hand coil section connected together, and working in parallel. The sections are designed separately with the total torque extended being the sum of the two.