SPRING SUSPENSION FOR VEHICLE

PURPOSE: To make such energy as being required for driving a spring leg drawable from a driving machine by letting at least one of two transducers, transducing the energy to hydromechanical energies connected to the driving machine, have a variable transductional ratio. CONSTITUTION: A first transducer 6 is connected to a driving machine 2 via a mechanical connection 4, transmitting energy existing in the mechanical shape to this first transducers 6 from the driving machine 2. In addition, at least a part of the mechanical energy reached from the driving machine 2 is transduced to the hydraulic energy, imparting it to a hydraulic connection 8, and a second hydraulic transducer 10 transduces the energy reached from the hydraulic connection 8 into the mechanical energy, imparting it to a spring leg 14 via a second mechanical connection 12. Then an electronic control unit 16 is constituted so as to make at least either of both these transducers 6 and 10 able to change the transductional ratio via two control conductors 18 and 20.