Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-04-27
1999-09-14
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9048, F01L 114, F01L 1300
Patent
active
059505834
ABSTRACT:
An internal-combustion engine valve gear has at least two adjacent stroke transmitting elements which, by way of a hydraulically displaceable coupling element, in a coupled position can be displaced with respect to one another and, in the uncoupled position, can be displaced independently of one another. The stroke transmitting elements interact with the cam of a camshaft having different cam paths which interact with different stroke courses with the stroke transmitting elements. In order to avoid undefined switching conditions in the operation of the internal-combustion engine and, during each switching operation have sufficient time for the displacement of the coupling element, this coupling element interacts with a locking element which locks and unlocks the coupling element as a function of the cam path.
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Gruenberger Joachim
Kraxner Dieter
Schwarzenthal Dietmar
Dr. Ing. h.c.F. Porsche AG
Lo Weilun
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