Spool valve controlled VCT locking pin release mechanism 

Patent No. 6,814,038

Issued: November 9, 2004
Filed: June 25, 2003

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


A variable cam timing system that utilizes the same spool that controls the VCT mechanism to actively control the locking pin. The positions of the spool's multiple lands directly influences whether source oil is supplied to both the locking pin and either the retard or advance chamber of the phaser.


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