Shock absorber assembly with adjustable height

A shock absorber assembly with adjustable height for a two-, or three-, or four-wheels leaning motor vehicle, said leaning motor vehicle including at least a suspension, comprising a shock absorber having a nominal length, including a spring, at least two couplings operatively connected to said suspension of the leaning motor vehicle, said spring having a first end and a second end, at least one hydraulic fluid pusher including a cylinder with an internal chamber installed in series with the spring, said pusher acting on either one of the two ends of the spring or said pusher acting on one of the two couplings, a source of pressurized hydraulic fluid in direct fluid connection with said pusher without any intermediate valves by means of a pipe in order to actuate said pusher, wherein the pipe in turn communicates in a fluid manner with the cylinder of the pusher, and wherein the pipe is fixed to a hydraulic connection communicating with the internal chamber of the cylinder, an accumulator tank assembly in fluid connection with the internal chamber of the cylinder of said pusher by means of a second pipe fixed to the hydraulic connection of the cylinder, said accumulator tank assembly in turn including at least one tank and at least one solenoid valve which controls the opening or closing of the inlet/outlet opening of the hydraulic fluid of said tank, said solenoid valve being provided with a large-section port and reduced pressure drops for the hydraulic fluid, so as to allow quick discharge of the hydraulic fluid present in the pusher towards said tank and causing an immediate release of the preload of the spring of the shock absorber or an immediate reduction of the loaded length of the shock absorber and therefore an immediate lowering of said leaning motor vehicle.