Patent ID: 7866289

Claim:
A camshaft adjusting device which has at least one vane cell adjuster component ( 11 a , 11 b ) coupled to a camshaft ( 10 a , 10 b ), comprising a central valve ( 22 a , 22 b ) having a central clamping means ( 13 a , 13 b ) for clamping the vane cell adjuster component ( 11 a , 11 b ) to the camshaft ( 10 a , 10 b ) along engagement surfaces thereof for rotation therewith, and an additional friction force increasing means ( 14 a , 14 b ) applied to the engagement surfaces for assisting a rotationally fixed coupling of the adjuster component ( 11 a , 11 b ) to the camshaft ( 10 a , 10 b ).