Patent ID: 7284521

Claim:
A shaft mechanism, in particular a camshaft of automotive engines, comprising two concentric contra-rotating shafts mounted one inside the other, namely an inside shaft ( 1 ) and an outside shaft ( 2 ), at least one cam ( 3 ) rotatably mounted on the outside shaft ( 2 ), fixedly connected to the inside shaft ( 1 ) radially through the outside shaft ( 2 ) via a fastening mechanism ( 5 ), a sleeve ( 6 ) gripped by the fastening mechanism ( 5 ) and inserted fixedly into aligned boreholes in the inside shaft ( 1 ) on the one hand and in the cam ( 2 ) on the other hand, a core ( 7 ) widening the material of the sleeve ( 6 ) within its elasticity limits in the area of the inside shaft ( 1 ), inserted into the sleeve ( 6 ) after insertion of the latter into the shaft mechanism, wherein the core ( 7 ) extends over the entire length of the sleeve ( 6 ) and widens the latter beyond the range limited by the inside shaft ( 1 ) without exceeding the upper limit of elasticity of the material of the sleeve ( 6 ) in comparison with its unmounted starting state.