Avoid drawing air into VCT chamber by exhausting oil into an oil ring 

Patent No. 6,935,290

Issued: August 30, 2005
Filed: July 14, 2004

Inventors: Jiang; Zhenyu (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

A VCT phaser for an internal combustion engine with at least one camshaft comprising a housing, a rotor, a spool valve and a ring-shaped reservoir. The housing having at least one chamber and the rotor having at least one vane dividing the chambers into advance and retard. The spool valve is comprised of a spool mounted within a bore of the rotor. The reservoir is defined within the bore by an oil dam and at least one of the spool lands. The spool has a first position in which a chamber is coupled to the supply and the other chamber is exhausting fluid and a second position in which a chamber is coupled to the supply and the other chamber is coupled to the reservoir. When a torque reversal occurs, hydraulic fluid pooled in the reservoir is drawn into the other chamber when the spool is in the second position.


This application claims an invention, which was disclosed in Provisional Application No. 60/492,364, filed Aug. 8, 2003, entitled "Avoid Drawing Air Into VCT Chamber By Exhausting Oil Into An Oil Ring." The benefit under 35 USC 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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