Patent ID: 8893674
Filing Date: 2014-11-25
Classification: F01L

Abstract:
1. A valve train device for controlling the valve lift of an internal combustion engine including a camshaft with axially displaceable cam elements having overlapping sections provided each with first and second sets of cam element shifting gates, the first set for shifting the cam elements in one direction and the second set for shifting the cam elements in an opposite direction, a first actuator for engaging the first set of shifting gates in order to shift the cam elements in the first direction and a second actuator for engaging the second set of shifting gates in order to shift the cam elements in the opposite direction, the first set of each overlapping cam element sections having two parallel S-shaped shift gates extending axially between one end position and an intermediate position and the second set of S-shaped shift gates extending axially between the center position and the other end position, the first actuator, upon engagement with a first shifting gate of the first set of shifting gates of one cam element, moving the one cam element from one end position to the intermediate position in a first half turn of the camshaft and in a second half turn moving the other cam element from the one end position to the intermediate position and, upon further engagement, moving the cam elements sequentially from the intermediate position to the other end position.