counteract bending movements between the members 9 and 10 of assembly 8 in the embodiment of fig1 and 2 the spring means comprises a compression spring which is clamped between a seat 15 connected with the chassis and an abutment 17 connected with the joint 11 by means of a draw bar 16 if the axle 1 moves upwardly that portion of the rear member 9 which is situated in front of the connection points for the means 12 will pivot downwardly and the spring 14 will be compressed the rear end of the balance beam or beams 4 will swing upwardly or downwardly by spring action when one or both wheels pass a bump the movement of the balance beam or beams will act upon the front axle 2 so that this will be displaced in the opposite direction which results in an equalizing effect upon the wheel movements by the arrangement of interconnected axles 1 and 2 and a spring means provided at one axle both axles will be suspended at the same time as the compensation in height of the relative position of the axles is obtained in the vertical sense as both axles can pivot about an axis positioned along the centre line of the chassis the axles may effect a diagonal movement with maintained spring action i e the axles form an angle to each other without any swaying movement in one direction or the other this applies to all the embodiments fig3 and 4 illustrate a different embodiment of the rod assembly 8a transmitting the horizontal forces the rear member 9a is again rigidly secured to the axle 1 the front member 10a however is connected to the chassis 3 by.