Abstract: A hydraulic torsional vibration damper comprising a primary part having an internal gear and a driving gear rim, a secondary part, and a planetary support having a hub and supported by said secondary part. A plurality of planetary gears are arranged in said planetary support and engage the internal gear of the primary part to form gear pumps for pumping a hydraulic medium. A plurality of suction chambers are arranged in the planetary support, each suction chambers having an inner and an outer wall. A ring-shaped pressure chamber is arranged between the hub of the planetary support and the planetary gears and is connected to the planetary gears. The pressure chamber is also controllably connected to the suction chambers.

Abstract: A clutch having a primary part and a secondary part for coupling together two coaxial rotating shafts including a driven shaft. The second part includes a driving disk, a trailing disk and tangential spring bodies forming a non-positive, engaging relationship between the driving disk and the trailing disk. At least one tangential spring body is a clamping body which is disposed within the second recess and abuts the radial edges of the first recess. The clamping body includes a cylinder, a piston slidably disposed within the cylinder to form a closed cylinder space. A cylindrical body made of an elastic material is disposed within the cylinder space. The cylindrical body completely occupies the cylinder space under initial axial compression of the piston whereby the cylindrical body absorbs further axial forces as an incompressible medium.