Patent GB-1108481-A (GB)
Title: Improvements in or relating to a suspension arrangement for equalising the wheel pressures of sprung wheels of threeaxle motor vehicles
IPC: B60G21/04
Filed: 1965-03-31
Abstract: 1,108,481. Equalizing loads on wheels. MASCHINENFABRIK AUGSBURG-NURNBERG A.G. 31 March 1965 [14 April, 1964], No. 13591/65. Heading B7D. In a suspension arrangement for equalizing the loads on the wheels of a three axle vehicle, each wheel is mounted on a pair of transverse links, each upper link 4 is arranged on a longitudinal shaft 11 formed over part at least of its length as a torsion bar spring 6, 8 and on each side of the vehicle the shaft 11 of the central wheel 3 is coupled by respective movement reversing devices 12 to the shafts 11 of the outer wheels 1, 2, so that the ends of the torsion bar springs 6 remote from but associated with the two outer wheels 1, 2 make equal movements in the opposite direction to the movement of the ends of the torsion bar spring 8 remote from but associated with the central wheel 2. The transverse links are triangular and the bearing eyes 5 of the links of the outer wheels are mounted on tubes 7 to one end of each of which is secured a spring 6 whereas the bearing eyes 5 of each central link 4 are mounted on a tube 9 to the centre of which is secured the middle of a torsion bar spring 8. The reversing devices may operate mechanically or hydraulically but preferably each comprises a casing containing gearing with a 2:1 ratio (Fig. 2a, not shown) so that the three axle unit is equivalent to two axles I, II of two-thirds the actual wheel base. The transverse pairs of casings 12 may be rotatable on the vehicle frame by transverse hydraulic cylinders which either rotate the casings in opposite directions to adjust the frame height (Fig. 8, not shown) or in the same direction to cant the frame laterally (Fig; 9, not shown). To provide load equalization between the two sides of the vehicle vertical arms 25 on the shafts 11 between each adjacent pair of wheels are connected to individual plungers (18) or common plungers (20) (Figs. 10, 11, not shown) in two transverse cylinders (17), the outer chambers of which are interconnected on each side of the vehicle. To permit rocking of the three axle unit about a longitudinal axis when used on a vehicle with a further axle or two or three axle unit, the centre chambers of the cylinders containing pairs of plungers are interconnected (Fig. 12, not shown). Fig. 4 (not shown) shows a simple hydraulic direction reversing means interconnecting the torsion bar portions 6, 8 with the outer cylinders of twice the diameter of the inner ones. This arrangement is modified by the addition of hydraulic lines 22 (Fig. 7) to reduce the effect of the three axle unit on the frame to that of a single axle and a line 24 between the inner cylinder centre chambers to permit lateral rocking of the " single axle " unit when a further one or more axles are provided on the vehicle. A pair of double-acting hydraulic cylinders 28 may be provided for each pair of levers 25 (Fig. 13, not shown) by which the axle loadings may be varied; the centre wheels, which may be provided with chains or steelbladed wheels, may be raised; or the front or rear wheels raised depending on the position of the centre of gravity relative to the centre wheels.