Mechanism for filtering torque fluctuations of a secondary member

A filtering mechanism for torque fluctuations, interposed between a crankshaft of an internal combustion engine rotating around an axis of revolution (100) and a transmission, comprising a member to be damped (14, 114, 214, 15) rotating around the axis of revolution (100), an oscillating inertial flywheel (22, 122, 222) rotating around the axis of revolution (100) with respect to the member to be damped (14, 114, 214), and pivot-mounted modules (26, 126, 226) allowing an angular deflection, on either side of an equilibrium position, of the oscillating inertial flywheel (22, 122, 222) with respect to the member to be damped (14, 114, 214), the pivot-mounted modules (26, 126, 226) each having at least one oscillating arm (26.1, 226.1) pivoting radially with respect to the member to be damped and a kinematic connecting member (26.4, 226.4, 26.40) between the oscillating arm (26.1, 226.1) and the oscillating inertial flywheel (22, 122, 222), positioned so that when the mechanism rotates around the axis of revolution (100), the centrifugal forces on the oscillating arm (26.1, 226.1) produce on the member to be damped (14, 114, 214, 15) a counteracting torque that tends to return the oscillating inertial flywheel (22, 122, 222) and the member to be damped (14, 114, 214) toward the equilibrium position, the counteracting torque increasing with the rotation speed of the filtering mechanism and with the amplitude of the angular deflection,

• wherein the filtering mechanism furthermore has a primary member interposed kinematically (12, 112, 212) between the crankshaft and the member to be damped (14, 114, 214), the member to be damped constituting a secondary member rotating around the axis of revolution (100) with respect to the primary member (12, 112, 212).