Automobile Engineering


A semi-independent rear suspension allows some individual rear wheel movement when one rear wheel strikes a bump. Many front-wheel-drive vehicles have a semi-independent rear suspension that has a solid axle beam connected between the rear trailing arms.


Semi-independent rear suspension system 


  • A solid axle beam is usually a transverse inverted U-section channel connected between the rear wheels in a semi-independent rear suspension system.
  • When one rear wheel strikes a bump, this beam twists to allow some independent wheel movement.
  • Some of these rear axle beams are fabricated from a transverse inverted U-section channel.


Coil springs in Semi-independent rear suspension system

  • In other semi-independent rear suspension systems, the coil springs are mounted separately from the shock absorbers.
  • Coil-spring seats are located on the trailing arms, and the shock absorbers are connected from the trailing arms to the chassis.
  • A cross-member connected between the trailing arms provides a twisting action and some independent rear wheel movement.






Track bar Semi-independent rear suspension

  • Some semi-independent rear suspension systems have a track bar connected from a rear axle bracket to a chassis bracket.
  • In some applications, an extra brace is connected from this chassis bracket to the rear upper cross-member.
  • The track bar and the brace prevent lateral rear axle movement.