Torsional vibration damper

The invention relates to a torsional vibration damper (100), in particular for a drive train of a motor vehicle, comprising: an input part (106) and an output part (108), the input part and the output part having a common axis of rotation, the input part (106) and the output part (108) are rotatable together about the common axis of rotation and are rotatable relative to each other to a limited degree; and-a spring damper device, which acts between the input part (106) and the output part (108). The output portion (108) comprises an output mass portion (120) having at least one mounting opening (104), and a sealing element (102) for sealing the at least one mounting opening (104), the output mass portion (120) having at least one mounting opening (104), when the sealing element is in a sealing position at the at least one mounting opening (104). The sealing element (102) is held in both an axial direction and a radial direction under the action of a spring preload force. 本发明涉及一种扭振阻尼器(100)，所述扭振阻尼器特别地用于机动车辆的传动系