A mechanical part by using the elastic work is usually made with torsion spring, spring steel wire, to control the mechanical movement, easing impact or vibration, storage or release of energy, the size of the measuring force.
The torsion spring of the coil spring. At the end of the torsion spring is fixed to the other components, while other components around the center of rotation of the spring, the spring will they back to initial position, the torque and rotation capacity. Torsion spring can store and release energy by torsion body angle or axial rotation arm with a static fixed device. This kind of spring is usually dense body, however, a pitch to reduce friction between the spring ring. They make a resistance to pivoting or rotating force. According to the application requirements, the design of the torsion spring turning (clockwise or counterclockwise), so as to determine the direction of rotation of the spring
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