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772,164. Spring suspensions: preventing lateral canting: equalizing load on wheels: adjusting body height. SOC. ANON. A. CITROEN. May 20, 1955 [Feb. 23, 1955], No. 14558/55. Class 108(2). A hydro-pneumatic suspension system for maintaining the underbody of a vehicle at a uniform height from the ground comprises, the suspension of a first pair of wheels 3, 3 having a swing arm 1 and a suspension cylinder 7 fixed to the underbody for each wheel, the cylinder being provided with a piston 5 connected to the swing arm, pipe means 11 connecting the suspension cylinders, a hydro-pneumatic suspension chamber 13 connected to the pipe means, a suspension member 8 linking the swing arms, a height corrector 16 controlling the hydro-pneumatic suspension chamber 13 through a connection 15 at an intermediate point of the suspension member, the suspension of a second pair of wheels having a swing arm 22, a link 20 attached to the swing arm and a suspension cylinder 14 fixed to the underbody for each wheel respectively, pipe means 53 connecting the suspension cylinders of the second pair of wheels to the hydro-pneumatic suspension chamber 13, each of the suspension cylinders of the second pair of wheels being provided with a piston 18 attached to the free end of the link 20, a double-acting corrector cylinder 23 fixed to the underbody for each wheel of the second pair, the corrector cylinder 23 being provided with a piston 43 connected to a point 50 intermediate the ends of the link 20, pipe means 24, 25 connecting the corrector cylinders, a suspension member 28, a distributer 26 controlling the corrector cylinders 23 connected with the midpoint of the suspension member of the second pair of wheels and pipe means 40 connecting the distributer of the second pair of wheels and the height corrector 16 of the first pair of wheels with a reservoir 29 of hydraulic liquid. As shown, the suspension members 8 and 28 which actuate respectively, the height corrector 16 and the distributer 26, are torsion bars. The arrangement is such that in the unloaded condition of the vehicle, the distributer 26 closes the feed to cylinders 23. Rotation of the torsion bar 28 in either direction however, admits pressure liquid to one or the other ends of the cylinders 23 to vary the effective connection of the devices 14, 18, 19 with the arms 22. The suspension chamber 13, the ends of which are also connected to the height corrector 16, consists of end portions 33, 34 separated by a gas-filled section 36. Specification 754,386 is referred to.
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