Torsion spring is the extreme of variant springs. From single torsion spring to double torsion spring, special-shaped torsion spring, and even the deformation of various torsion bars can be formed according to design. Therefore, it is difficult to master the necessary information of torsion spring during design:
(1) Free length.
(2) Control diameter: (a) outer diameter, (b) inner diameter, (c) inner diameter of the casing, or (d) outer diameter of the round rod.
(3) Wire size "wire diameter".
(4) Material (type and grade).
(5) Turns: (a) total turns and (b) right-handed or left-handed.
(6) Torsion: the number of pounds deflected to a certain angle.
(7) Z large deflection (angle from free position).
(8) End form.
Please note: material diameter (d), outer diameter (d), torsion arm length (L), free height (LO), and other geometric dimensions, such as guide moment (T 1, T 2... T J) and corresponding and corresponding torsion angle（ Ψ ）
