Concentric cam with check valves in the spool for a phaser

Patent No. 8,186,319

Issued: May 29, 2012
PCT Filed: June 13, 2008
PCT No.: PCT/US2008/066862
371(c)(1),(2),(4) Date: December 10, 2009
PCT Pub. No.: WO2009/005999

Inventors: Pluta; Christopher J. (Ithaca, NY), Wigsten; Mark M. (Lansing, NY), Wyatt; Steven W. (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


A camshaft assembly for an internal combustion engine has a hollow outer shaft with slots along its length and an inner shaft with holes along its length. The holes on the inner shaft are aligned with the slots on the outer shaft. A first set of cam lobes are fixed to the outer shaft and a second set of cam lobes are placed on the slots of outer shaft with a clearance fit. A means fixes the second set of cam lobes to the inner shaft, while simultaneously allowing the second set of cam lobes to be a clearance fit to the outer shaft. The means fixing the second set of cam lobes to the inner shaft may be a hollow pin which is hydroformed or a rivet insert which is expanded by insertion, pulling, and removal of a threaded rod.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 60/947,470, filed Jul. 2, 2007, entitled "CONCENTRIC CAM WITH CHECK VALVES IN THE SPOOL FOR A PHASER" and Provisional Application No. 61/041,663 filed Apr. 2, 2008, entitled "CONCENTRIC CAM WITH CHECK VALVES IN THE SPOOL FOR A PHASER". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.


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