Variable valve actuation system for an internal combustion...

Details Variable valve actuation system for an internal combustion... Variable valve actuation system for an internal combustion...

2011-01-18

2011-01-18

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090390

Reexamination Certificate

active

07870841

ABSTRACT:
A valve system is disclosed for an internal combustion engine which allows a secondary valve event, serving for example to provide internal EGR, to be selectively disabled. The system comprises two valve10and22, a first cam20acting on the first valve10by way of a rocker12pivotable about a fixed pivot axis and a second cam36having at least two lobes and acting on the second valve22by way of a second rocker24pivotable about an eccentric26. The second of the two lobes of the second cam36is arranged to open the second valve22at a time that the first valve10is opened by the first cam20. A selectively operable latching mechanism50latches the eccentric26in a fixed position in which each of the cam lobes of the second cam causes the second valve to open. When the latching mechanism50is released, a coupling between the eccentric26and the first rocker12causes or permits the eccentric26to move during the opening of the first valve10in a sense to oppose the lifting of the second valve22by the second lobe of the second cam.

REFERENCES:
patent: 6584943 (2003-07-01), Klotz
patent: 1649148 (2006-04-01), None
patent: 7180515 (1995-07-01), None

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