Abstract: A torque limiter includes a first ring adapted to be fixed to a flywheel and being driven to rotate about a rotation axis, a second ring a certain distance from the first ring, and a compression ring between the first ring and the second ring. A friction disc is slidably sandwiched between the second ring and pressure ring, and a spring washer is arranged between the first ring and pressure ring, the pressure ring receiving a pressing force from the spring washer and pressing the friction disc against the second ring. The first and second ring are integrally formed, the first ring provided with first teeth, the spring washer provided with support teeth, and each support tooth is supported by one first tooth. A transmission system includes the above-described torque limiter.

Abstract: A device for damping torsional oscillations, the device including at least one support capable of rotational displacement around an axis, at least one pendulum assembly, including at least one pendulum mass, the pendulum assembly being movable with respect to the support, at least one rolling member, each rolling member interacting with at least one first raceway defined by the support and with at least one second raceway defined by the pendulum assembly, the displacement of the pendulum assembly with respect to the support being guided by at least one of those rolling members, the device further including at least one friction member, carried by the pendulum assembly, for generating hysteresis in all or parts of the relative displacements of the pendulum assembly and the support.