Patent ID: 8033565
Filing Date: 2011-10-11
Classification: B60G

Abstract:
1. A trailer tandem wheel suspension system comprising: a pair of suspension units for mounting on either side of a chassis of a trailer, each suspension unit rotatably supporting a pair of wheels, wherein each suspension unit includes a first suspension subset pivotally mounted to the chassis for supporting one of the wheels, a second suspension subset pivotally mounted to the chassis for supporting the other wheel; a primary spring element; and a secondary spring element linked to the primary spring element, each spring element being responsive to a pre-determined movement of the wheels relative to the chassis and responsive to a predetermined pivotal movement of each suspension subset; wherein the primary spring element is a leaf spring having a first end and a second end connected to the first and second suspension subsets, respectively, and mounted on one of the subsets between the first and second ends, and wherein the secondary spring element is a meta-elastic hollow rubber spring having one end connected to said one subset and having another end connected to one end of the leaf spring and the other subset.