Double torque flywheel in particular for motor vehicle

Double flywheel vibration damper including two coaxial masses (1, 2) free to rotate relative to each other and acting against elastic parts (3, 30), in which one of the masses, referred to as the first mass (1), is intended to be fastened to a drive shaft, whereas the other mass, referred to as the second mass (2), includes a reactionplate (21) assuring rotational connection to a driven shaft, and in which said first mass (1) has a central hub (5, 50-7) projecting axially and carrying bearing means (4, 40) operating between said second mass (2) and said central hub (5, 50-7) to enable said second mass (2) to rotate on said first mass (1), wherein said central hub (5, 50-7) comprises two aligned coaxial parts, namely a first hub (5, 50) supporting said second mass (2) rotationally via said bearing means (4, 40) fitted on this first hub, and s second hub (7) intended to be fastened to said drive shaft, and wherein said second hub (7) constitutes an axial spacer between said drive shaft and said first hub (5, 50).