Patent ID: 8371588

Claim:
Actuator, which is actuated along a longitudinal axis (A), in particular for a spring carrier ( 50 ), comprising: a stationary part ( 12 , 32 , 32 ′), a first rotor ( 14 , 14 a , 14 b ), which can be driven so as to perform a rotary motion, a rotatable second rotor ( 16 , 16 a , 16 b ), which is supported against the stationary part ( 12 , 32 , 32 ′) in the axial direction in an axial rest position, a coupling device ( 36 , 36 a , 36 b , 36 c ), by means of which the second rotor ( 16 , 16 a , 16 b ) is coupled to the first rotor ( 14 , 14 a , 14 b ), and an output element ( 52 ), which is connected to the second rotor ( 16 , 16 a , 16 b ) and is moved axially by means of a rotary motion of the second rotor ( 16 , 16 a , 16 b ), the coupling device ( 36 ) interacting with the first rotor ( 14 , 14 a , 14 b ) and the second rotor ( 16 , 16 a , 16 b ) in such a way that, starting from the rest position, an axial movement of the second rotor ( 16 , 16 a , 16 b ) is produced by means of a first rotary motion of the first rotor ( 14 , 14 a , 14 b ) in order to release the said second rotor from the stationary part ( 12 , 32 , 32 ′) and thereby bring it into a working position, and that, in the working position of the second rotor ( 16 , 16 a , 16 b ), the second rotor ( 16 , 16 a , 16 b ) is driven, by means of a second rotary motion of the first rotor ( 14 , 14 a ) or by driving the second rotor ( 16 , 16 a , 16 b ) relative to the first rotor ( 14 b ), so as to perform a rotary motion in order to move the output element ( 52 ) axially while the second rotor ( 16 , 16 a , 16 b ) is substantially stationary in the axial direction.