Patent ID: 7597075
Filing Date: 2009-10-06
Classification: F01L

Abstract:
1. An adjustment device for adjusting a relative rotational angle position of a camshaft relative to a crankshaft of an internal combustion engine, comprising: a crankshaft-fixed drive part and a camshaft-fixed driven part; a primary adjustment device comprising an adjustment motor; and an auxiliary drive as a secondary adjustment device; wherein the camshaft can be moved into a fixed rotational angle position that defines an emergency running position by the auxiliary drive upon failure of the adjustment motor; the auxiliary drive comprises a torsion spring and a reduction gear, and is coupled to the adjustment motor to adjust the rotational angle to the emergency running position without an external supply of energy upon failure of the adjustment motor; and the torsion spring is pre-tensioned when the engine is started, decoupled in the pre-tensioned state, and is coupled with an actuator that moves the camshaft upon failure of the adjustment motor.