Patent ID: 7802548

Claim:
A camshaft adjusting device for adjusting a phase position of a camshaft with respect to a crankshaft, comprising a rotary actuator having an arm ( 47 ) and including an a stator ( 45 ) and at least one axially displaceable rotor ( 31 ), and a gear mechanism ( 10 ) arranged between two of at least three shafts ( 11 , 12 , 13 ), one of the shafts, being a control shaft ( 13 ) acted upon by the rotary actuator, another one of the shafts being a drive shaft ( 11 ) connected to the crankshaft, and one of the shafts being an output shaft ( 12 ) connected to the camshaft, and means for locking at least two of the at least three shafts ( 11 , 12 , 13 ) to one another in a rotationally fixed manner, as a function of operating conditions, via an excitation coil ( 42 ) for acting on the rotary actuator, and an auxiliary coil ( 44 ) for axially moving the rotor ( 31 ) at least in one direction ( 20 ) out of engagement with the drive shaft ( 11 ), the auxiliary coil ( 44 ) being disposed in an annular recess ( 43 ) into which also an armature ( 34 ) connected to the rotor ( 31 ) extends, so that, upon energization of the auxiliary coil ( 44 ), the rotor ( 31 ) is drawn by means of the armature ( 34 ) into the annular recess ( 43 ) of the stator ( 45 ).