Electromechanical actuator comprising a dual-function braking device

1. An electromechanical actuator comprising a fixed body, an electric motor having a stator fastened to the fixed body, and at least one motion transmission element rotatably connected to a rotor of the motor, said element being connected to the fixed body via a unidirectional transmission member and a brake device, the brake device comprising at least one inner ring connected to rotate with a first portion of the unidirectional transmission member and at least one outer ring connected to the fixed body with axial clearance, the actuator being characterized in that the unidirectional transmission member is mounted directly between the transmission element and the brake device and in that the brake device comprises an electrical activator member configured so that, when the activator member is powered, the unidirectional transmission member is released relative to the fixed body and that when the activator member is not powered, the unidirectional transmission member is secured to the fixed body and opposes pivoting of the transmission element in one direction of rotation up to a maximum transmissible torque that is defined by sliding between the inner ring and the outer ring and that is predetermined in order to avoid excessive force on the transmission element damaging the actuator or a support on which the actuator is fastened.

2. The actuator according to claim 1 , wherein the brake device comprises two inner rings and two outer rings, the inner and outer rings being in alternation.

3. The actuator according to claim 1 , wherein the unidirectional transmission member is a freewheel.

4. The actuator according to claim 1 , comprising a casing in which the brake device and the unidirectional transmission member are housed.