Valve timing control system

Details Valve timing control system Valve timing control system

2007-09-12

2009-11-03

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C464S160000

Reexamination Certificate

active

07610884

ABSTRACT:
A first-side check valve prevents a hydraulic fluid from being discharged out of a retard chamber, and a second-side check valve prevents the hydraulic fluid from being discharged out of an advance chamber. A first-side control valve opens or closes a first-side discharge passage by a pilot pressure received through a retard pilot passage. A second-side control valve opens or closes a second-side discharge passage by the pilot pressure received through an advance pilot passage. Another check valve is disposed in a supply passage between a phase switch valve and a branch point, at which a supply passage is branched.

REFERENCES:
patent: 7182052 (2007-02-01), Yaoko et al.
patent: 7506622 (2009-03-01), Takahashi et al.
patent: 2007/0107684 (2007-05-01), Takahashi et al.
patent: 2006-46315 (2006-02-01), None
U.S. Appl. No. 11/783,002, filed Apr. 2007, Ushida et al.
U.S. Appl. No. 11/854,249, filed Sep. 12, 2007, Takahashi et al.
U.S. Appl. No. 11/854,156, filed Sep. 12, 2007, Takahashi et al.

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