Patent ID: 6941911

Claim:
An adjustable valve control device for an internal combustion engine having a drive shaft, a camshaft rotated by the crankshaft, and at least one valve actuated by the camshaft with a specific timing, the valve control device modifying a rotary phase of the camshaft relative to the drive shaft in order to change the timing of at least one valve, comprising a first rotor which rotates synchronously with the drive shaft, a second rotor which rotates synchronously with the camshaft, there being formed between the first rotor and the second rotor a plurality of fluid pressure chambers which are supplied with fluid by way of at least one line provided with a return valve, so that the rotary phase of the camshaft relative to the drive shaft may be modified by rotation of the first rotor in a direction opposite that of the second rotor, and a lock bolt for locking the first rotor and the second rotor from each other, characterized in that fluid is applied to the lock bolt by way of a separate line which branches off upstream from the return valve.