Valve control device for an internal combustion engine

Claim 1

In a valve control system in cylinders of an internal combustion engine, particularly for high-speed automotive engines, for the continuous adjustment of valve control times and valve strokes in accordance with the speed of rotation and/or load of the engine, having an eccentric shaft arranged in a cylinder head of the engine common to intake and exhaust valves, to which shaft there are pivoted connected rods which point in opposite directions transverse to the longitudinal axis of the eccentric shaft and which operatively drive valve rockers acting on the intake and exhaust valves, the improvement comprising a pair of said intake and exhaust valves per cylinder, said eccentric shaft has only one eccentric thereon per cylinder, two of said connecting rods for operatively driving said intake valve and the exhaust valve of said cylinder respectively are jointly mounted on said one eccentric, a double-acting swing cam means is operatively pivotally coupled to each said connecting rod, respectively, each said swing cam means being for positive control of the valve associated therewith in both directions of swing thereof via respective of the valve rockers, each of the valve rockers being formed with a fork-shaped section in form-locked engagement with an associated of said swing cam means, each said valve rockers being operatively pivoted to the associated valve, respectively, said two connecting rods form an angle of less than 180 degrees between longitudinal axes respectively thereof extending through a center point of said eccentric and an operative pivot point of said connecting rods to said swing cam means, respectively, means for displacing the eccentric shaft transversely to the longitudinal axis of said eccentric shaft in such a manner that the distances between said eccentric shaft and pivot axes of said two swing cams are simultaneously changed upon a change in the position of the eccentric shaft.