Variable camshaft timing mechanism with a default mode

Patent No. 8,820,280

Issued: September 2, 2014
Filed: September 30, 2011
PCT Filed: September 30, 2011
PCT No.: PCT/US2011/054196
371(c)(1),(2),(4) Date: March 27, 2013
PCT Pub. No.: WO2012/047748
PCT Pub. Date: April 12, 2012
Term Extension: 23 days

Inventor: Smith; Franklin R. (Cortland, NY)
Assignee: BorgWarner Inc. (Auburn Hill, MI)


A variable cam timing phaser with a control valve for directing fluid from a fluid input to and from the advance chamber and the retard chamber of the phaser through an advance line, a retard line, a common line, an advance default line, a retard default line, and at least one exhaust line. The control valve being movable between a default mode and an oil pressure actuated mode. In the default mode, the control valve blocks exhaust lines, retaining fluid within the chambers. The oil pressure actuated mode includes at least an advance mode, a retard mode, and a holding position.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 61/389,451, filed Oct. 4, 2010, entitled "VARIABLE CAMSHAFT TIMING MECHANISM WITH A DEFAULT MODE" and Provisional Application No. 61/417,943, filed Nov. 30, 2010, entitled "VARIABLE CAMSHAFT TIMING MECHANISM WITH A DEFAULT MODE". The benefit under 35 USC 119(e) of the United States provisional applications are hereby claimed, and the aforementioned application is hereby incorporated herein by reference.


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