Free stopping mechanism

The invention provides a free stopping mechanism which comprises a mechanism base and a mechanism turning leaf, wherein the mechanism base and the mechanism turning leaf are connected on one side in a penetrating mode through a revolving shaft. A flange is arranged on the revolving shaft. A first friction piece, a second friction piece and a dish cushion piece are arranged among the mechanism base, the mechanism turning leaf and the flange at intervals. The mechanism base and the mechanism turning leaf are pressed through the flange. An opening-assisting spring is wound on the periphery of the revolving shaft and connected with the mechanism base at one end and connected with the mechanism turning leaf at the other end. The diameters of the friction pieces and the outer diameter of the opening-assisting spring can be controlled within 24mm and even can reach 12mm. Pressure on the friction pieces depends on pressure of riveting equipment or screwing torque of a nut so as to facilitate adjustment. Key parts are reduced. Coaxiality and rigidity are improved to prevent the revolving shaft from axially displacing. Attenuation of the friction pieces after a high temperature and low temperature fatigue alternating test is relieved and the friction pieces can undergo thirty thousand times of fatigue tests.