Torsional assisted multi-position cam indexer having controls located in rotor

Patent No. 6,883,481

Issued: April 26, 2005
Filed: November 14, 2003

Inventors: Gardner; Marty (Ithaca, NY); Duffield; Michael (Medina, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

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.

This is a continuation application of application Ser. No. 10/198,318, filed Jul. 18, 2002 now abandoned, entitled "HYBRID MULTI-POSITION CAM INDEXER HAVING CONTROLS LOCATED IN ROTOR", which claims an invention which was disclosed in Provisional Application No. 60/312,285, filed Aug. 14, 2001, entitled "HYBRID MULTI-POSITION CAM INDEXER HAVING CONTROLS LOCATED IN ROTOR". The benefit under 35 USC .sctn.119(e) of the U.S. provisional application is hereby claimed, and the aforementioned applications are hereby incorporated herein by reference in their entireties.

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