Valve train for internal combustion engines for actuating gas exchange valves

摘要

A valve train for actuating a gas exchange valve of an internal combustion engine includes a camshaft configured to be driven by a crankshaft of an engine and including a camshaft tube. At least one cam support including a plurality of cam profiles is disposed on the camshaft so as to be rotationally engaged and axially displaceable with respect to the camshaft. A switching shaft is disposed in the camshaft tube and is configured to rotate together with the camshaft tube. A dog operatively connects the at least one cam support to the switching shaft. A displacement piece is connected to the switching shaft and is configured to be rotationally engaged with and axially displaceable on the camshaft tube. The displacement piece is actuatable so as to rotate the switching shaft relative to the camshaft tube and displace the cam support relative to the camshaft tube using the dog.

主权项

1. A valve train for actuating a plurality of gas exchange valves of an internal combustion engine, the valve train comprising:
at least one camshaft configured to be driven by a crankshaft of the internal combustion engine and including a camshaft tube; at least one cam support disposed on the at least one camshaft so as to be rotationally engaged and axially displaceable with respect to the at least one camshaft, the at least one cam support including a plurality of different cam profiles having an identical base circle portion; a switching shaft disposed in the camshaft tube and configured to rotate together with the camshaft tube; a dog operatively connecting the at least one cam support to the switching shaft, the dog being configured to slide in a switching contour of the switching shaft; a displacement piece connected to the switching shaft and configured to be rotationally engaged with and axially displaceable on the camshaft tube; and an actuator operatively connected to the displacement piece and configured to actuate the displacement piece so as to rotate the switching shaft relative to the camshaft tube, wherein when the switching shaft is rotated relative to the camshaft tube the dog axially displaces the at least one cam support relative to the camshaft.