Energy absorber for a crashworthy seat and crashworthy seat comprising such an energy absorber

摘要

An energy absorber (100) to limit an acceleration force experienced by a heavy body, such as an occupant of a seat subjected to the acceleration of an aircraft crash, comprises a winding drum (10) mounted in rotation around a shaft (13), around which a traction line (11) is wound. The shaft is coupled mechanically to a brake (20) that immobilizes the shaft (13) in rotation when a torque applied to the shaft by the traction line is less than the maximum brake torque that can be generated by the brake and that when the shaft (13) is in rotation generates a torque that is approximately constant and equal to the maximum brake torque.;A control element (40) acting on the brake (20) makes it possible to modify the value of the maximum brake torque and thus to adapt the energy absorber to the mass of the heavy body to maintain an acceleration experienced at a desired value for different masses.

主权项

1. An energy absorber (100) to limit an acceleration force experienced by a heavy body, comprising a winding drum (10) mounted in rotation around a shaft (13), around which a traction line (11) is wound, in an untriggered configuration of the energy absorber, in which said shaft is mechanically coupled to a rotor (21) of a disk brake (20), a stator (22) of which is immobilized in rotation relative to a casing (101), characterized in that a spring element (30) is compression-mounted between two sub-assemblies (20a, 20b) of the brake (20), each sub-assembly comprising rotor and stator elements that are mounted alternately and mobile in a direction of an axis of rotation of the rotor (21), in such a way as to exert a support force that is applied between the rotor elements and the stator elements in contact, so as to immobilize the shaft (13) in rotation when a torque applied to the shaft by the traction line (11) that is subjected to a tractive force is less than a maximum brake torque of the brake and that when the shaft is in rotation, in a triggered configuration of the energy absorber, generates a torque that is approximately constant and equal to the maximum brake torque.