Hydrodynamic converter comprising a turbine wheel and a locking clutch, said hydrodynamic converter comprising: - a torsion damping device between a motor shaft and a driven shaft that are coaxial of axial orientation, the device comprising: - a torque input element (12A, 12B) and a torque output element; - at least one first upstream elastic member with circumferential action whose upstream circumferential end face is capable of being stressed by the input element (12A, 12B) or of stressing it; - at least one second downstream elastic member with circumferential action whose downstream circumferential end face is capable of stressing or being stressed by the output element; - at least one first radial phase washer (40A, 40B), the downstream end face of each upstream elastic member being capable of stressing or being stressed by an upstream phasing radial face of the phase washer (40A, 40B), and the upstream end face of each downstream elastic member being capable of being stressed by a downstream phasing radial face of the phase washer (40A, 40B) or of stressing it so that the two elastic members (36A, 36B) are mounted in series; each elastic member (36A, 36B) being received circumferentially between the associated phasing face (50A, 50B) and an associated holding radial face (52B, 52A) facing the phase washer (40A, 40B), the circumferential distance between a phasing face (50A, 50B) and the facing holding face (52B, 52A) being at most equal to the circumferential length of the elastic member at rest said device characterized in that: - each phase washer (40A, 40B) is linked in rotation with the turbine wheel while the input element (12A, 12B) is linked in rotation with the locking clutch. - a torsion damping device between a motor shaft and a driven shaft that are coaxial of axial orientation, the device comprising: - a torque input element (12A, 12B) and a torque output element; - at least one first upstream elastic member with circumferential action whose upstream circumferential end face is capable of being stressed by the input element (12A, 12B) or of stressing it; - at least one second downstream elastic member with circumferential action whose downstream circumferential end face is capable of stressing or being stressed by the output element; - at least one first radial phase washer (40A, 40B), the downstream end face of each upstream elastic member being capable of stressing or being stressed by an upstream phasing radial face of the phase washer (40A, 40B), and the upstream end face of each downstream elastic member being capable of being stressed by a downstream phasing radial face of the phase washer (40A, 40B) or of stressing it so that the two elastic members (36A, 36B) are mounted in series; - a torque input element (12A, 12B) and a torque output element; - at least one first upstream elastic member with circumferential action whose upstream circumferential end face is capable of being stressed by the input element (12A, 12B) or of stressing it; - at least one second downstream elastic member with circumferential action whose downstream circumferential end face is capable of stressing or being stressed by the output element; - at least one first radial phase washer (40A, 40B), the downstream end face of each upstream elastic member being capable of stressing or being stressed by an upstream phasing radial face of the phase washer (40A, 40B), and the upstream end face of each downstream elastic member being capable of being stressed by a downstream phasing radial face of the phase washer (40A, 40B) or of stressing it so that the two elastic members (36A, 36B) are mounted in series; - each phase washer (40A, 40B) is linked in rotation with the turbine wheel while the input element (12A, 12B) is linked in rotation with the locking clutch.