| 摘要 |
A valve drive of an internal combustion engine with variable-lift gas exchange valve actuation. The valve drive has a camshaft with a support shaft and a cam piece arranged on the support shaft for conjoint rotation therewith and to be movable between axial positions. The cam piece has two cam groups of directly adjacent cams with different elevations and, on the end side, the cam piece has an axial slotted guide into which can be coupled an actuating element. The cam piece has a bearing journal which runs between the cam groups and rotatably mounted in a camshaft bearing point arranged in a positionally fixed manner in the engine. Here, the diameter of the bearing journal is larger than the envelope circle diameter of a cam closest to the bearing journal with the cam and camshaft bearing point overlapping axially in an axial position of the cam piece.
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