| 摘要 |
The invention concerns an electromechanical actuator comprising: a first reversible assembly comprising a central screw (1), a first electric motor (2) designed to drive the central screw in rotation, a first nut (3) axially mobile on the central screw when the latter is driven in rotation, and means (4) interposed between the central screw and the first nut to enable a reversible displacement of one at least of those two members; and a second irreversible assembly comprising an annular screw (5) externally secured to the first nut (3), a second electric motor (6) designed to drive in rotation the annular screw and the first nut (7), a second nut (7) locked in rotation relative to the mount (9), but axially mobile on the annular screw when the latter is driven in rotation, and a piston (8) arranged at one of the ends of the second nut (7) to clamp the discs (29) against one another so as to ensure service braking when the first motor is actuated and parking braking when the second motor is actuated.
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