Abstract: A suspension system includes a body comprising a cylindrical cavity in which a piston is slidably mounted that divides the cylindrical cavity into two working chambers: a lower chamber and an upper chamber, each of which receives a gas. The piston is connected to a piston rod protruding from the cylindrical cavity through a sealing ring. The body slides within an external tube of the suspension system. The external tube is engaged around the piston rod and a lower plug is at its free end to which the end of the piston rod is secured. The space between the lower plug and the sealing ring determines within the external tube a third chamber filled with gas by a preload valve. A single filling valve fills the lower and upper chambers, and a transfer element transfers gas from one of the two working chambers to the other, according to predetermined conditions.

Abstract: A suspension system includes a body comprising a cylindrical cavity in which a piston is slidably mounted that divides the cylindrical cavity into two working chambers: a lower chamber and an upper chamber, each of which receives a gas. The piston is connected to a piston rod protruding from the cylindrical cavity through a sealing ring. The body slides within an external tube of the suspension system. The external tube is engaged around the piston rod and a lower plug is at its free end to which the end of the piston rod is secured. The space between the lower plug and the sealing ring determines within the external tube a third chamber filled with gas by a preload valve. A single filling valve fills the lower and upper chambers, and a transfer element transfers gas from one of the two working chambers to the other, according to predetermined conditions.

Abstract: A suspension device for a wheeled vehicle, includes a shock absorber (105) and a spring (110), disposed between a non-suspended portion of a vehicle and a suspended portion of the vehicle, the shock absorber (105) having a shock absorber body (1) provided with a cylindrical cavity (10) in which slides a piston (2), the piston being connected to a rod (3) leaving the cylindrical cavity through a sealing ring (4), the piston (2) being provided with calibrated elements (5) for passage of a fluid such as an oil from sub-cavity (10a) to a sub-cavity (10b) as a function of the movements of the piston, in response to forces exerted on the suspension, the piston including a discharge device (15), this discharge device being adapted to take a position of opening a conduit between one sub-cavity and the other and a position of closing this conduit.