A tandem axle assembly includes a first slipper spring and a second slipper spring. The two slipper springs are configured or oriented in series with the slipper ends of the two slipper springs oriented toward each other. A keeper for a tandem axle suspension assembly is also disclosed.

A slipper and/or eyed leaf-spring vehicle suspension system is provided with a compliant oversized pivot bushing and a torque rod or control arm, respectively. Each of the torque rod or control arm are provided with at least one over-sized eye bushing-housing into which the compliant oversized pivot bushing is compressed into. The compliant oversized pivot bushing has an elastomeric annulus mounted on a rigid sleeve wherein compliant oversized pivot bushing has an overall outside diameter that is greater to much greater than its width.

A slipper and/or eyed leaf-spring vehicle suspension system is provided with a compliant oversized pivot bushing and a torque rod or control arm, respectively. Each of the torque rod or control arm are provided with at least one over-sized eye bushing-housing into which the compliant oversized pivot bushing is compressed into. The compliant oversized pivot bushing has an elastomeric annulus mounted on a rigid sleeve wherein compliant oversized pivot bushing has an overall outside diameter that is greater to much greater than its width.

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) 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 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.

A suspension system for a vehicle is provided. The suspension system includes a first chassis rail extending longitudinally in an axial direction of the vehicle. The suspension system also includes a second chassis rail extending longitudinally in the axial direction of the vehicle. The suspension system further includes a transverse beam coupled to the first chassis rail and the second chassis rail. The suspension system yet further includes 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. The suspension system also includes a fulcrum locator operatively coupled to the at least one leaf spring and to the transverse beam, the fulcrum locator in a sliding relationship with the at least leaf one spring.

A suspension system for a vehicle is provided. The suspension system includes a first chassis rail extending longitudinally in an axial direction of the vehicle. The suspension system also includes a second chassis rail extending longitudinally in the axial direction of the vehicle. The suspension system further includes a transverse beam coupled to the first chassis rail and the second chassis rail. The suspension system yet further includes 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. The suspension system also includes a fulcrum locator operatively coupled to the at least one leaf spring and to the transverse beam, the fulcrum locator in a sliding relationship with the at least leaf one spring.

Vehicle suspension systems are described herein. An example vehicle suspension includes a yoke to couple a knuckle to an axle of the vehicle suspension. The yoke includes a post to receive the axle and a lobe projecting from the post.