Over-travel hidden rail with mute effect

The overtravel hidden rail with the mute effect comprises a fixed rail body and a movable rail body which are sequentially connected, the movable rail body is installed on the tops of the two sides of a drawer, the fixed rail body is installed on a cabinet body corresponding to the movable rail body, and an extended middle ball nest assembly is connected between the movable rail body and the fixed rail body in a sliding mode. The extended middle ball nest assembly is provided with a bottom supporting ball nest part which can be opened along with the movable rail to be supported between the front end of the fixed rail and the rear end of the movable rail, and the two sides of the bottom supporting ball nest part are provided with buffering elastic parts used for making elastic contact with the fixed front limiting block and the movable rear limiting block respectively. The stretching stroke is increased while the utilization rate of the cabinet space is guaranteed, the structure is stable and reliable, operati