Passive antiroll device for the suspension of a motor vehicle, and a suspension incorporating it

A passive antiroll device for the suspension of a motor vehicle comprising a torsion bar and two lateral links respectively articulated, on the one hand, to the two ends of the torsion bar by two first hinges and, on the other hand, to two lateral shock absorbers of the suspension by two second hinges, at least one of said links, or a telescopic link, including a piston slidably mounted in a piston tube by means of a rod which carries this piston and which is directly connected to the second hinge, the piston being able to slide reversibly due to the movement of the second hinge and cooperating in compression with return means housed inside said tube, wherein these return means include two compressible stop components which are positioned about said rod inside said tube and which are each designed to impart to the or each link, a progressive stiffness with compression in the axial direction of said rod which increases with the amplitude of the ascending or descending movements of the axis of the adjacent wheel of the vehicle, so that this wheel is substantially uncoupled from the torsion bar or coupled to it for small or large-amplitude movements, respectively, wherein said two compressible stop components each have a series of axially spaced out elements, which elements are:

• annular radial lobes, each stop component having in this case a continuous cross-section geometry of annular shape, the respective axial thicknesses of these lobes increasing axially from the said piston toward a corresponding end wall of said piston tube, or
• tiers open at their centers and connected axially to each other in pairs by oblique connecting bars spaced out on the periphery of the said tiers, each stop component having then a discontinuous cross-section geometry.