Hydraulic suspension system

The vehicle has a hydro-pneumatic suspension device (13) interposed between wheel supports (11) and case to transmit an effort to the case based on load undergone by wheel (10A). The device has damping devices (41-43) with varied damping capacities, each one being associated with an accumulator (31-33) and interposed between the accumulator and jack (20). The jack has a room connected to each of the accumulators.