An infinitely variable cam indexer utilizes engine oil pressure to actuate a
cam
and preferably uses an inlet check valve in the oil source to minimize back flow
during a torque reversal. The control system is in the center of the rotor and
uses an electromechanical actuator, preferably a variable force solenoid, acting
directly on the spool to control oil flow. This design reduces leakage and improves
the response of the phaser. There are shorter oil passages as compared to a control
system mounted at the cam bearing.
