Dual lift rocker arm latch mechanism and actuation...

Details Dual lift rocker arm latch mechanism and actuation... Dual lift rocker arm latch mechanism and actuation...

2005-11-21

2009-02-03

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090200, C123S090440, C074S559000

Reexamination Certificate

active

07484487

ABSTRACT:
A valve control system including a camshaft having first and second cam profiles, the valve control system comprising a rocker arm assembly (11) including a first rocker arm (13) having a first cam follower (15) in engagement with the first cam profile, and a second rocker arm (17) having a second cam follower (23,25) in engagement with the second cam profile. The engine includes a fulcrum location (P) operable to provide a source of pressurized fluid, and the first rocker arm includes a latch member (47) moveable between latched (FIG.6) and unlatched conditions. The latch member is biased toward the latched condition by a fluid pressure in a chamber (51), and the first rocker arm defines a fluid passage (55) having a first end (57) in open fluid communication with the pressure source, and a second end (59) in open fluid communication with the pressure chamber (51).

REFERENCES:
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patent: 5655488 (1997-08-01), Hampton et al.
patent: 5975251 (1999-11-01), McCarthy
patent: 6615782 (2003-09-01), Hendriksma et al.
patent: 6668779 (2003-12-01), Hendriksma et al.
patent: 0733783 (1996-09-01), None
patent: WO 2004/094791 (2004-11-01), None
PCT Search Report dated Jul. 11, 2007 for International Application No. PCT/IB2006/003292.

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