Abstract: A tandem axle vehicle suspension system which includes a rear axle mount that is automatically moveable between a forward caster and rearward caster position of the axle mount relative to the suspension system to cause self-steering of the rearward axle when the vehicle is operated to move forwardly and rearwardly, respectively.

Abstract: The present invention provides a tandem axle suspension of the type disclosed in U.S. Pat. No. 4,741,553, for use with trailer tag axles with structural modifications being made thereto adapting the tandem axle suspension of the present invention for use with a vehicle having a tandem pair of drive axles. The suspension includes a torque spring bracket that enables torque springs to be easily assembled to or disassembled from the suspension assembly, the spring bracket being equally well suited for tandem axle suspensions as single axle suspensions.

Abstract: The present invention provides a tandem axle suspension of the type disclosed in U.S. Pat. No. 4,741,553, for use with trailer tag axles with structural modifications being made thereto adapting the tandem axle suspension of the present invention for use with a vehicle having a tandem pair of drive axles. The suspension includes a torque spring bracket that enables torque springs to be easily assembled to or disassembled from the suspension assembly, the spring bracket being equally well suited for tandem axle suspensions as well as single axle suspensions.

Abstract: A tandem axle vehicle suspension is provided which, in variant embodiments, employs one or two torque beams each supporting an axle of a tandem axle vehicle and each pivotally connected to a load compensator where a single elastomer spring is mounted between each torque beam and compensator and is subjected to both compression and shear forces during over-the-road operation.

Abstract: A steerable fork mount that is pre-assembleable and compact comprising a fork having a top and two depending pedestals that are rigidly formed together, that are relatively short in the fore and aft direction, with a rocker beam at the bottom, rockable about a vertical stub shaft supported on each pedestal and providing an arrangement to support a spring mounted between the rocker beam and the pedestal, and with an arrangement to make the pedestal structure extremely rigid and strong, particularly in the transmission of the displacement forces from the wheel to the spindle mount.

Abstract: A suspension assembly for a truck type vehicle comprises a trunnion shaft rotatably mounted to the axle with a pair of spring supports mounted to the trunnion shaft, a pair of coil springs extending between the spring supports and the chassis, a pair of torque rods rotatably mounted and extending between a chassis member and the axle seat, and a torsion roll bar pivotally connected to and extending between the suspension on each side of the vehicle and the chassis frame. In an alternate embodiment, a single piece axle seat and spring support assembly is bolted to the axle for mounting of the springs.

Abstract: A suspension system for a drive axle includes an angular torque beam fixedly secured to the axle, one or two air springs extending between the torque beam and the chassis, and a universal joint comprised of two transversely mounted rubber bushings mounting the forward end of the torque beam to the chassis. The drive axle suspension may also have a beam guide mounted to the torque beam and extending upwardly adjacent the chassis frame, or a cross radius rod to limit lateral movement. Another embodiment of the suspension is for a steer axle which has a straight torque beam and either an outboard beam guide or an aft vertical rail guide to limit the lateral displacement of the suspension with respect to the chassis.