Abstract: A torsional oscillation damper for a combustion-engine crankshaft has a relatively light annular disk and a rigid abutment disk which are both centered on and rotatable about an axis. These two disks are spaced axially from each other but are fixed axially and rotationally together. A relatively heavy annular disk also centered on and rotatable about this axis independently of the light and abutment disks lies between these light and abutment disks. An annular soft elastomeric ring is engaged between the light and heavy disks and a ring of friction material is engaged axially with at least one spring between the heavy and the abutment disks. Thus oscillations are damped not only in the elastomeric ring but also by generation of friction between the ring of friction material and either the heavy or abutment disk that it engages.

Abstract: A joint interconnecting a driving member and a driven member with limited relative mobility comprises one or more elastic rings each bracketed by an outer and an inner annular plate, the plates being respectively secured to the two members. A friction coupling is inserted between one of the outer plates and one of the inner plates to damp relative oscillations between the two members without excessive heating of the elastic rings. The friction coupling may be formed by a brake lining inserted between the two plates, or a pair of such brake linings separated by a resilient annular spacer.

Abstract: A joint inserted between a driving member and a driven member, such as a pair of substantially coaxial shafts or a shaft and a flywheel, comprises a stack of annular steel foils each having an even number of peripherally equispaced webs which are alternately secured to the two members via respective pairs of screws. The webs are interconnected by integral strips in the form of outwardly and/or inwardly bulging lobes enabling relative angular and radial shifting of the two members without exertion of a significant axial force upon them. The screws pass through mounting holes in the webs whose distance from the stack axis is greater than half the maximum radius of the foils.