The invention relates to a suspension system of a vehicle axle, comprising:—a leaf spring (11);—a rear attachment device which is configured to be secured to a vehicle frame (2) and which receives a rear end portion (14) of the leaf spring (11) so as to allow said leaf spring rear end portion to slide longitudinally relative to the rear attachment device; wherein:—the rear attachment device (24) comprises a fastener (26) extending substantially transversally and a pad (28) secured on the rear attachment device above the fastener;—the leaf spring rear end portion (14) is substantially flat and has an upper face (15) in contact with the pad (28) and a lower face (16);—and the suspension system further comprises a retaining member (30) which is a piece separate from the leaf spring (11). The retaining member (30) is secured to and under the leaf spring rear end portion (14) by a fixing element (50) located rearward of the pad (28), the retaining member (30) including a front wall (33) arranged forward of the fastener (26), and configured to abut against the fastener (26) in order to prevent a rearward movement of the leaf spring (11) relative to the rear attachment device (24) above a predetermined limit.

The invention relates to a suspension system of a vehicle axle, comprising: —a leaf spring (11); —a rear attachment device (24) which is configured to be secured to a vehicle frame (2) and which receives a rear end portion (14) of the leaf spring (11) so as to allow said leaf spring rear end portion to slide longitudinally relative to the rear attachment device; wherein: —the leaf spring rear end portion (14) forms at least part of a loop curved around a transverse axis, the loop being longitudinally elongated and having an opening (29) located at least at the front of said loop; —the rear attachment device (24) comprises a fastener (26) extending substantially transversally and received in said loop; —and the suspension system further comprises retaining means (30) configured to prevent the fastener (26) from getting out of the loop through the opening (29).

The invention relates to a suspension system of a vehicle axle, comprising: —a leaf spring (11); —a rear attachment device (24) which is configured to be secured to a vehicle frame (2) and which receives a rear end portion (14) of the leaf spring (11) so as to allow said leaf spring rear end portion to slide longitudinally relative to the rear attachment device; wherein: —the leaf spring rear end portion (14) forms at least part of a loop curved around a transverse axis, the loop being longitudinally elongated and having an opening (29) located at least at the front of said loop; —the rear attachment device (24) comprises a fastener (26) extending substantially transversally and received in said loop; —and the suspension system further comprises retaining means (30) configured to prevent the fastener (26) from getting out of the loop through the opening (29).

A suspension system for a rear axle of a vehicle provided with a frame equipped with at least two side members, the suspension system connecting the axle to said side members and comprising a left side and a right side, each comprising an axle-holder assembly, a bellows, a leaf spring, first and second bars, and a torsion bar interposed between said left and right sides. The aforementioned elements of the suspension system being arranged to provide a functional layout having reduced costs and overall dimensions.

A torsion spring assembly for a wheel suspension of a motor vehicle, including two torsion bars arranged coaxially one inside another and also a spring element, which is arranged axially-parallel to the two coaxial torsion bars, and can be mounted on the motor vehicle body via a bearing position, wherein the radial outer hollow-cylindrical torsion bar can be mounted on the motor vehicle body side and is connected in a rotationally-fixed manner to an output lever fastenable on a wheel guiding element and the radial inner torsion bar is connected in a rotationally-fixed manner to the outer torsion bar and is connected in a rotationally-fixed manner via a coupling to the spring element.

The invention relates to a suspension system of a vehicle axle, comprising: a leaf spring (11); a rear attachment device (24) configured to be secured to a vehicle frame (2) and comprising two parallel walls (40) spaced apart along a transverse direction by a distance (d). A rear end portion (14) of the leaf spring (11) is received in the rear attachment device (24), between said walls (40), and is capable of sliding longitudinally relative to the rear attachment device. The leaf spring rear end portion (14) has a first width (w1) which is smaller than the distance (d), and the leaf spring (11) has a second width (w2) which is greater than the distance (d), at least in a blocking portion (30) of the leaf spring (11) located forward of the rear end portion (14).

The invention relates to a suspension system of a vehicle axle, comprising: a leaf spring (11); a rear attachment device (24) configured to be secured to a vehicle frame (2) and comprising two parallel walls (40) spaced apart along a transverse direction by a distance (d). A rear end portion (14) of the leaf spring (11) is received in the rear attachment device (24), between said walls (40), and is capable of sliding longitudinally relative to the rear attachment device. The leaf spring rear end portion (14) has a first width (w1) which is smaller than the distance (d), and the leaf spring (11) has a second width (w2) which is greater than the distance (d), at least in a blocking portion (30) of the leaf spring (11) located forward of the rear end portion (14).

A suspension system for a vehicle includes a first chassis rail and a second chassis rail, each extending longitudinally in an axial direction of the vehicle. Also included is a first leaf spring element extending longitudinally in the axial direction of the vehicle, the first leaf spring element operatively coupled proximate ends thereof to the first chassis rail and at an intermediate location to an axle assembly of the vehicle. Further included is a second leaf spring element extending longitudinally in the axial direction of the vehicle, the second leaf spring element operatively coupled proximate ends thereof to the second chassis rail and at an intermediate location to the axle assembly of the vehicle. Yet further included is at least one leaf spring extending in a transverse direction of the vehicle, the at least one leaf spring having a spring rate that is actively variable.

A suspension system for a vehicle includes a first chassis rail and a second chassis rail, each extending longitudinally in an axial direction of the vehicle. Also included is a first leaf spring element extending longitudinally in the axial direction of the vehicle, the first leaf spring element operatively coupled proximate ends thereof to the first chassis rail and at an intermediate location to an axle assembly of the vehicle. Further included is a second leaf spring element extending longitudinally in the axial direction of the vehicle, the second leaf spring element operatively coupled proximate ends thereof to the second chassis rail and at an intermediate location to the axle assembly of the vehicle. Yet further included is at least one leaf spring extending in a transverse direction of the vehicle, the at least one leaf spring having a spring rate that is actively variable.

A tandem suspension system. At least two parallel axles are connected via two eyeleted leaf springs. The eyeleted leaf springs have ends that terminate in eyelets. Each eyelet receives a bushing and adjustable pin. A bracket secures the axles to the eyeleted leaf springs. The eyeleted leaf springs are camelback leaf springs, planar leaf springs or bent leaf springs. Additional leaf springs are also provided.