Torsion damping device for ship shafting

The utility model discloses a torsion vibration damping device for a ship shafting, which relates to the technical field of ship vibration damping, and comprises a driving disc, a driven mandrel disc, a damping fin, an output flange and a vibration damping spring, the driving disc comprises a first disc body and a second disc body, the damping fin and the driven mandrel disc are clamped between the first disc body and the second disc body, and the output flange is connected with the first disc body. The first disc body and the second disc body are fixedly connected, spring windows are arranged at the corresponding positions of the first disc body, the second disc body, the driven core shaft disc and the damping fin, the damper springs are arranged in the spring windows, the output flange is fixed to the movable core shaft disc, and the torsional vibration energy of a shaft system is dissipated through the damping fin and the inherent frequency of the shaft system is tuned through the damper springs. The techn