Abstract: A tubular shaft comprises a torque-transmitting tubular structure compris at least one torque-transmitting shell, which has elastic properties oriented along at least one helical line. To permit the tubular shaft to be used as an effective vibration damper, the shell surrounds a pumping chamber, which is adapted to contain a damping liquid and communicates through at least one constricted passage with a reservoir for damping liquid.

Abstract: A coupling member for incorporation in a torque-transmitting drive train comprises a tube and at least one flange at at least one end of the tube. The tube and flange consist of fiber-reinforced plastic. In order to permit a simpler manufacture and an improved selection of strength and load-carrying properties in adaptation to different conditions of use, the tube and the flange are separately prefabricated and are adhesively joined to and by a sleeve.

Abstract: In torsional vibration dampers and torsionally elastic coupling which comse torque-transmitting spring elements, which are clamped between spacers by an external clamping ring, which is elastically expanded for the installation of the spacers and spring elements. For a quick and efficient assembling of the dampers or couplings, the spacers alone are initially inserted into the clamping ring and are then subjected to radially outwardly directed pressure until the clamping ring has been expanded beyond the extent required to clamp the spring elements, which are subsequently inserted between the spacers, whereafter the spacers are relieved from pressure. This method can be carried out with the aid of a cylindrical assembling head, which is provided at its periphery with at least one radially movable pressure-applying member, which cooperates with at least one hydraulic cushion, which is adapted to be pressurized.

Abstract: A torsionally elastic vibration-damping and/or coupling mechanism has tor-transmitting, radial leaf springs, which at one end are gripped in an outer member and at the other end engage grooves of an inner member. To impart such a damping or coupling device a particularly long life by avoiding unfavorable friction conditions, rolling elements are disposed in the grooves between the leaf springs and the sides of the grooves.