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

Details Avoid drawing air into VCT chamber by exhausting oil into an... Avoid drawing air into VCT chamber by exhausting oil into an...

2005-08-30

2005-08-30

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090120, C123S090150, C123S090160, C123S090180, C464S160000, C137S625340, C137S625350

Reexamination Certificate

active

06935290

ABSTRACT:
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.

REFERENCES:
patent: 5367992 (1994-11-01), Butterfield et al.
patent: 5803029 (1998-09-01), Yoshihara et al.
patent: 6035819 (2000-03-01), Nakayoshi et al.
patent: 6739293 (2004-05-01), Turner et al.
patent: 6093815 (1994-04-01), None
patent: 07-224616 (1995-08-01), None

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