Electro-hydraulic actuator for brake

An electro-hydraulic actuator for actuating a brake with a hydraulic thrust unit, the actuator comprising:

• an electric motor with a drive shaft,
• a converting mechanism connected with the drive shaft and adapted to convert a rotational motion of the drive shaft into a translational motion of a translatable portion,
• a cylinder and a piston received in the cylinder and constrained to the translatable portion so as to translate together with respect to the cylinder along a piston stroke extending from a rear end of stroke to a front end of stroke, wherein the piston stroke comprises:
• a front length including the front end of stroke and having a length less than or equal to half the length of the piston stroke, and
• a rear length including the rear end of stroke and having a length less than or equal to half the length of the piston stroke,
• a pressure chamber defined by the cylinder and the piston and having a volume that varies as a function of the piston position, from a maximum volume when the piston is at the rear end of stroke position to a minimum volume when the piston is at the front end of stroke position,
• a supply duct in communication with said pressure chamber and adapted to be connected with the hydraulic thrust unit of the brake, characterized in that the converting mechanism is configured so that, for a given angular speed of the drive shaft, the translation speed of the piston decreases from a maximum value in a position of the piston in the rear length to a minimum value in a position of the piston in the front length.