Member arranged to act between two in relation to each other movable parts of a vehicle

A member arranged to act between two parts of a vehicle which are movable in relation to each other, wherein the member extends between said parts and comprises a first portion connectable to the first part of the vehicle and a second portion connectable to the second part, wherein the first portion comprises an elongated rod having external threads and the second portion comprises a nut rotatably provided on the rod so that the length of the member during a rotary motion between the rod and the nut is variable in an axial direction, wherein an electric rotor machine having a stator and a rotor is arranged to influence said rotary motion and wherein the rotor and the nut are located in relation to each other such that at least one plane perpendicular with respect to the axial direction extends through both the rotor and the nut, wherein the rotor and the nut are rigidly connected and constitute an integrated part.