US 12,305,728 B2
Slack adjuster assembly for heavy-duty vehicles
Jay D. White, Lenoir, NC (US); David L. Schaeffer, Louisville, OH (US); Dhawal P. Dharaiya, Twinsburg, OH (US); and Wyatt R. Weekley, Lincoln, NE (US)
Assigned to Hendrickson USA, L.L.C., Schaumburg, IL (US)
Filed by Hendrickson USA, L.L.C., Schaumburg, IL (US)
Filed on Sep. 13, 2022, as Appl. No. 17/943,292.
Claims priority of provisional application 63/246,829, filed on Sep. 22, 2021.
Prior Publication US 2023/0088211 A1, Mar. 23, 2023
Int. Cl. F16D 65/54 (2006.01); F16D 125/30 (2012.01)
CPC F16D 65/546 (2013.01) [F16D 2125/30 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A slack adjuster assembly for heavy-duty vehicles, said slack adjuster assembly comprising:
a slack adjuster disposed about and having an internal spline for receiving an external spline of an inboard end of a camshaft of a camshaft assembly of the heavy-duty vehicle, said internal spline having a radial clearance from said external spline, the external spline having an axial length; and
an inboard sealing assembly disposed over said inboard end of said camshaft and engaging an inboard side of said slack adjuster to form a 360-degree seal about said inboard side;
wherein a ratio of said length to said radial clearance is less than or equal to 40, said ratio providing increased flow and distribution of grease between the internal spline and the external spline.