Phaser with a single recirculation check valve and inlet valve
Patent No. 7,137,371
Issued: November 21, 2006
Inventors: Simpson; Roger T. (Ithaca, NY), Gardner; Marty (Ithaca, NY)
A variable cam timing phaser for an internal combustion engine having at least one camshaft comprising a housing, a rotor, a spool valve, and a recirculation check valve. The housing and the rotor define at least one vane which separate chambers, advanced and retard. The spool valve comprises a spool having a plurality of lands mounted within a bore in the rotor. The spool is slidable from an advance position through a holding position to a retard position. The phaser also has an advance exhaust passage, a retard exhaust passage, and a return passage to route operating fluid to the chambers. The recirculation check valve is in the return passage and only allows flow of fluid from the advance chamber into the return passage when the spool is in the retard position and fluid from the retard chamber into the return passage when the spool is in the advance position.
REFERENCE TO RELATED APPLICATIONS
This application claims an invention which was disclosed in Provisional Application No. 60/445,748, filed Feb. 7, 2003, entitled "CAM TORQUE ACTUATED PHASER WITH A SINGLE RECIRCULATION CHECK VALVE AND INLET VALVE". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.
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