COUPLING DEVICE HAVING A VARIABLE MECHANICAL GAIN

摘要

The device includes an actuator (A) comprising a screw (10) with a given pitch for being rotatable about an axis (XX) in one direction or in an opposite direction by a motor (M), a nut (12) engaging with the screw (10) and translatable in the direction of the axis (XX) of the screw, a first groove-shaped guide means (34L) defining a linear guide parallel to the axis (XX) of the screw (10) so as to lock the rotation of the nut (12) into a first movement phase of the nut, and a second groove-shaped guide means (34H) defining a helical guide extending along the axis (XX) of the screw (10) and having a pitch that is the reverse of the pitch (Pi) of the screw so as to enable the rotation of the nut in the same rotational direction as the screw (10) in a second movement phase of the nut (12), the grooves (34L, 34H) being cut into a hollow bushing (30) that forms a stationary mounting suitable for being rigidly connected to one or the other of a load (C) and a supporting frame (B) while the nut (12) extends by a movable mounting (14) having a coupling system (48) placed along an axis (ZZ) perpendicular to the axis (XX) of the screw (10), said coupling system (48) being suitable for insertion into the other of the load (C) and the supporting frame (B). The invention can be particularly used in hanging a battery tray under a motor vehicle body shell.