Power winding is composed of steel strip coil and, in accordance with its relaxed into the shape of a natural shape and force power wind power two, power directly from the natural shape spring strip wound prestressed power system, put the strip shape, and then in the opposite direction into a spiral shape, and spread out the letters S like, it is also known as S spring. Scroll spring in the use of the need to limit its outer barrel, a power shaft is connected with the center of the shaft, when the external force relative rotation and spring, spring will roll on the power shaft and stored energy, when the external force disappears, the spring will produce torque drive shaft, a spring to store the energy through the drive shaft the output of the same specification, the comparison, prestressed power spring can store 25%-40% of torque, the same space can provide the rotation number of more.
Wind power is mainly used in toys, clockwork spring wire, wire wound electrical charge, clocks and timers, rolling machine, automobile safety belt.