Cam torque actuated variable camshaft timing device with a bi-directional oil pressure bias circuit

Patent No. 8,800,515

Issued: August 12, 2014
Filed: March 13, 2013

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

A phaser with a cam torque actuated vane defining cam torque actuated advance and retard chambers and an oil pressure actuated vane defining oil pressure actuated advance and retard chambers. The phaser is moved to an advance position and a retard position through both cam torque energy and oil pressure energy. The holding position of the phaser is maintained through oil pressure energy.

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