Torsion spring

Torsion springs are coil springs, which generate torque or rotational force. The ends of the torsion spring are fixed to other components, and when the other components rotate around the center of the spring, the spring pulls them back to their original positions. Although this spring is called a torsion spring, it is subject to bending rather than torsional stress. The torsion spring can store and release angular energy or rotate the arm around the central axis of the spring body to statically fix a device.
This type of spring is usually dense, but there is a pitch between the coils to reduce friction. They generate resistance to rotation or external forces of rotation. According to the application requirements, design the rotation direction of the torsion spring (clockwise or counterclockwise) to determine the rotation direction of the spring.
Application: Common applications of torsion springs are: clothing pins, clipboards with paper clips, backsplashes and garage doors. Torsion springs are also used in hinges, balance bodies and handle reset devices. This spring comes in a variety of sizes, such as miniature springs for electronic devices and large springs for seat controllers. The spring should be loaded according to the direction of rotation; it is not recommended to rotate the spring from a position other than the free position. When the spring rotates, the diameter becomes shorter and the spring body becomes longer. This needs to be considered when the design space is limited. The torsion spring has the best performance when it is supported by a rod or tube. The designer should consider the effect of friction and moment arm deflection on torque.
Configuration: When designing torsion springs, the coils of the torsion spring are in close contact, the purpose is to promote rotation and make it produce angular rebound force. There are many options for the force arm configuration so that the spring can be fixed in different ways. For torsion springs, the moment arm specifications that need to be considered include moment arm angle, equal moment arm length, and moment arm closing type. When the springs are straight or parallel on the same side, the arm angle is regarded as 0°, and the angle increases along the non-rotating direction. Force arm closing types include straight torsion, linear offset, hinged, short hook closing and hook closing. To meet the application requirements, you can bend or twist the closing of the torsion spring, or make it into a hook or loop. The free arm positions of torsion springs stocked by Lisbring Springs include: 90°, 180°, 270° and 360°.
The double torsion spring consists of a set of right-hand rotating coils and a set of left-hand rotating coils. These coils are usually connected by the unclosed parts between the windings, and these coils rotate in parallel. This part needs to be designed separately, and the total torque is the sum of the coils at both ends.