Torsion damping device

A torsion damping device, especially for automobiles, of the kind comprising at least two coaxial parts mounted to rotate relative to one another within defined limits of angular displacement against elastic units extending in the circumferential direction, each elastic unit having an interior, each elastic unit being disposed partly, on the one hand, in an opening of one of said parts and, on the other hand, in an opening of the other of said parts, wherein inside at least one elastic unit a stiffer elastic means is housed, comprising, in the central zone of said unit, a block of relatively rigid plastic material disposed with a predetermined clearance relative to two elastic pads which said elastic unit presents at each of its circumferential ends and wherein the elastic pads are supported by small spring seats in the shape of small plates interposed between each circumferential end of said elastic unit and a housing of one of the said parts.