The present invention relates to an assembly for enabling rotational motion in a vehicle or mobile working machine. This comprises at least two sections, at least two of which are arranged in an overlying position relative to the vehicle's or working machine's working surface, thus making up a top section (9) and a bottom section (10). Such a top section can be led to motion relative to the bottom section and the vehicle's or working machine's longitudinal rotation axis (11). For this purpose, the top section and the bottom section are coupled to each other in a movable manner by way of at least one trajectory element (14) which generates a curvilinear trajectory. By means of the trajectory element, the relative motion of the top section and the bottom section proceeds along a curvilinear trajectory in a section plane which is perpendicular relative to the lengthwise rotation axis (11). At least over a part of its length the trajectory is in the shape of a circular arc, the midpoint of this curvilinear trajectory being disposed below the bottom section (9). The motion is adapted to be generated by means of at least one actuator (15) mounted on the vehicle or working machine and having an effect on the top section (9) and/or the bottom section (10).
