Abstract: A flywheel for an internal combustion engine comprises a support and a ring gear. The support possesses a radial surface and the ring gear possesses a complementary radial surface. According to the invention, the ring gear is shaped in such a manner as to allow the ring gear to deform radially towards the axis of rotation of the flywheel at least in certain deformation angular sectors corresponding to compression and expansion zones of the pistons of the engine, and the complementary radial surface is fixed to the radial surface in fixing annular sectors that are situated between adjacent pairs of deformation angular sectors.

Abstract: The flywheel of all internal combustion engine comprises a support and a ring gear. The outer peripheral end of the support has a radial surface and the inner peripheral end of the ring gear has a complementary radial surface. An element of viscoelastic material is situated between the radial surface and the complementary radial surface in such a manner as to put under compression stress in the radial and axial directions.