Patent ID: 8919239

Claim:
An actuator piston receiving a hydraulic actuator linked to a control rod and acting via a reaction disk on a thrust rod, the actuator piston being subjected to the action of a return spring and of a drive of the servo brake, characterized in that A—the actuator piston ( 100 ) formed by an injection-molded piece ( 120 ) including a cylindrical body ( 121 ) at the rear and a collar ( 122 ) at the front, the cylindrical body ( 121 ) receiving the hydraulic actuator ( 110 ) and a travel detector ( 160 ), a opening of the collar ( 122 ) opening into the cylindrical body ( 121 ) being occupied by a shell ( 150 ) covering a front face of the collar to serve as a support for the return spring ( 150 ) and receive the reaction disk ( 140 ), a rear face of which is accessible to the hydraulic actuator ( 110 ), B—a rear end ( 123 ) of the cylindrical body ( 121 ) of the actuator piston includes an internal cruciform arrangement of primary lugs ( 125 ) protruding toward the interior to form a guiding bearing for the hydraulic actuator ( 110 ), the front of the lugs forming an abutment ( 126 ), C—the hydraulic actuator ( 110 ) includes a cylindrical surface that is bounded at the front by a cruciform arrangement of secondary lugs ( 115 ) of a form complementing that of the body ( 121 ) of the actuator piston and with an offset overall peripheral orientation, in order, on assembly, to introduce the hydraulic actuator ( 110 ) by the rear into the cylindrical body ( 121 ) and retain it by the abutment of the secondary lugs ( 115 ) against the primary lugs ( 125 ) after relative pivoting thereof, D—a locking and guiding sleeve ( 180 ), provided with a cruciform arrangement of ribs ( 181 ) adapted to the cruciform arrangement of the intervals between the secondary lugs ( 115 ), is introduced into the actuator piston ( 100 ) by the front and fits with the ribs ( 181 , 181 a ) in the interval of the secondary lugs ( 115 ) to block a rotation of the hydraulic actuator ( 110 ) while allowing it to slide.