Abstract: The present disclosure relates to the field of motor vehicles. The teachings thereof may be embodied in a self-locking internal damper comprising: a damper body with a closed chamber; each of two ends of the closed chamber in the length direction including a straight plate section projecting therefrom, with a center line of the straight plate section passing through a center point of the closed chamber; two connecting portions located at ends of the two straight plate sections, respectively; and at least one of the two connecting portions including a bent structure formed by extending and bending one of the straight plate sections.