The Freightliner Four-Spring Equalizer Suspension

Spring tandem suspensions fall into three basic categories with reference to their attachment to the frame. The Freightliner suspension is the three-point, four-spring type. This type has definite advantages in drive line articulation and has a further advantage in frame loadings. This paper points out the importance of suspension articulation with reference to drive line spline slip rather than the more common attention given to drive line angle parallelism. It further deals with the loads imparted into the frame by the suspension and deals specifically with the Freightliner three-point suspension.