Abstract: The invention relates to a suspension system for a set of vehicle wheels with rigid axle, said suspension system comprising, on the one hand, a longitudinal torsion tube articulated at one of its ends on the chassis of the vehicle so as to be able to pivot about a transverse horizontal axis without possibility of rotating about its longitudinal axis and fast at its other end with said rigid axle and, on the other hand, two longitudinal elastic blades which are disposed laterally each on one side of said torsion tube and of which each is fixed at one of its ends to said axle, is pivoted in its intermediate part on said chassis about a transverse axis and is in abutment at its other end against said chassis. The invention is more particularly applicable to a suspension for road tractor.

Abstract: Suspension for a two-sheeled undercarriage of a vehicle comprising two arms pivotable about an axis transversal to said vehicle, each arm carrying one wheel, and an assembly of tubes of axes parallel to said transversal axis and made of a composite material of fibers and synthetic material.The suspension according to the invention is remarkable in that said assembly comprises a first tube integral with the vehicle chassis by each of its ends, and about which tube each arm can pivot, as well as two second tubes integral by each of their ends with one of said arms, said first tube and said second tubes being interconnected in their middle part.

Abstract: The invention relates to a suspension system for a set of vehicle wheels with rigid axle, wherein it comprises, on the one hand, a horizontal and transverse torsion bar articulated so as to be able to rotate about its longitudinal axis and, on the other hand, two longitudinal elastic blades which are disposed laterally each on one side of said chassis and of which each is rigidly connected at one of its ends to said torsion bar, is fixed in its intermediate part to said rigid axle and is in abutment at its other end against said chassis. The invention is more particularly applicable to a suspension system for road tractor.