Mechanical actuator with a hydraulic damper device

An actuator comprising:

• a cylinder (1;
• 101),
• a rod (2;
• 102) mounted to slide in said cylinder,
• a screw (8;
• 108) extending inside the rod to co-operate with a nut (7;
• 107) secured to the rod, the screw being driven in rotation by a motor (10;
• 110), and
• a floating piston (20;
• 120) sliding in sealed manner against the rod inside of the actuator and defining with said rod a hydraulic chamber (CH) arranged inside the actuator, the hydraulic chamber being filled with hydraulic fluid and in fluid flow communication with an accumulator (21;
• 121) via a solenoid valve (22;
• 122) that is controllable between a closed state in which the chamber is isolated from the accumulator, and a fluid-passing state in which the hydraulic fluid can pass from the hydraulic chamber to the accumulator and inversely depending of difference of pressure between the hydraulic chamber and the accumulator,
• wherein a calibrated resistance is exerted against the passage of fluid from the chamber towards the accumulator as obtained when movement of the rod inside the actuator leads to a reduction in the volume of the hydraulic chamber, said calibrated resistance being provided to oppose the motion of the rod.