Variable camshaft timing device with hydraulic lock in an intermediate position

Patent No. 8,356,583

Issued: January 22, 2013
Filed: March 10, 2009
PCT Filed: March 10, 2009
371(c)(1),(2),(4) Date: October 13, 2010
PCT Pub. No.: WO2009/114500
PCT Pub. Date: September 17, 2009

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


A variable cam timing phaser for an internal combustion engine including a piloted valve in the rotor assembly, movable from a first position to a second position, and detent lines communicating with the advance chamber or the retard chamber are restricted and or blocked when the rotor assembly is in or near an intermediate phase angle position. When the piloted valve is in the first position, fluid is blocked from flowing through the piloted valve. When the piloted valve is in a second position, fluid is allowed to flow between the detent line from the advance chamber and the detent line from the retard chamber through the piloted valve and a common line, such that the rotor assembly is moved to and held in the intermediate phase angle position relative to the housing assembly.


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