Valve timing control apparatus

Details Valve timing control apparatus Valve timing control apparatus

2011-08-02

2011-08-02

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090120, C123S090150, C464S160000

Reexamination Certificate

active

07987827

ABSTRACT:
A valve timing control apparatus for controlling valve timing includes a first rotor, a second rotor, and a controller. The second rotor and the first rotor defines therebetween an advance chamber and a retard chamber. The controller includes a supply passage, at least one drain passage, a spool valve, at least one connection passage, and at least one check valve. The at least one connection passage connects the supply passage to the at least one drain passage when a spool of the spool valve is moved to one of the advance and retard positions. The at least one check valve is respectively provided in the at least one connection passage. The check valve allows working fluid to flow in a direction from the at least one drain passage toward the supply passage and limits working fluid from flowing in an opposite direction.

REFERENCES:
patent: 7124722 (2006-10-01), Smith
patent: 2009/0071426 (2009-03-01), Knecht et al.
patent: 2006-63835 (2006-03-01), None
patent: 2007-138744 (2007-06-01), None
Japanese Office Action dated Nov. 4, 2009, issued in corresponding Japanese Application No. 2007-307987, with English translation.
Japanese Office Action dated Mar. 16, 2010, issued in corresponding Japanese Application No. 2007-307987, with English translation.

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