Charge-exchange valve activating and deactivating device for internal-combustion engine of motor vehicle, has roll adjusted in active position, and switching device permitting pivoting of roll in release position

摘要

The device (2) has a valve cam periphery (12) whose control contour (15) transfers a partial roll (10) into a passive position. The roll is adjusted in an active position and operates a valve lever (8) for pivoting. The contour transfers the roll from the passive position to an evasive position, where the roll is adjusted in the passive position such that the roll does not operate the valve lever for pivoting. A switching device (13) obstructs pivoting of the roll back from the passive position to the active position in a locking position and permits pivoting of the roll in a release position.