US 11,813,918 B2
Axle/suspension system for heavy-duty vehicles
Jeff R. Zawacki, Channahon, IL (US); Dmitriy Enrikovich Rubalskiy, Glenview, IL (US); and Gary E. Gerstenslager, Canton, OH (US)
Assigned to Hendrickson USA, L.L.C., Schaumburg, IL (US)
Filed by Hendrickson USA, L.L.C., Schaumburg, IL (US)
Filed on Aug. 29, 2022, as Appl. No. 17/897,927.
Claims priority of provisional application 63/238,474, filed on Aug. 30, 2021.
Prior Publication US 2023/0060738 A1, Mar. 2, 2023
Int. Cl. B60G 5/053 (2006.01); B60G 9/00 (2006.01); B60G 11/10 (2006.01); B60G 11/107 (2006.01); B60G 15/06 (2006.01)
CPC B60G 5/053 (2013.01) [B60G 9/003 (2013.01); B60G 15/06 (2013.01); B60G 2200/31 (2013.01)] 34 Claims
OG exemplary drawing
 
1. A tandem assembly for a suspension system of a heavy-duty vehicle comprising:
a front suspension assembly pivotally attached to a main member of said heavy-duty vehicle;
a rear suspension assembly pivotally attached to said main member; and
a single mechanical spring, a first end of said mechanical spring being operatively engaged with a longitudinally extending front beam of said front suspension assembly, a middle portion of the mechanical spring being operatively engaged with the main member, and a second end of said mechanical spring being operatively engaged with a longitudinally extending rear beam of said rear suspension assembly.