Patent ID: 7041022

Claim:
An actuator device for superimposed steering engagement in a vehicle steering system, including first and second input shafts ( 12 , 14 ), an output shaft ( 13 ) coaxial with the first input shaft ( 12 ), and a superposition gear ( 15 ) disposed between the first and second input shafts ( 12 , 14 ) and received in an actuator housing ( 11 ), the superposition gear ( 15 ) comprising a two-stage, modified planetary gear ( 16 ), which has a first sun wheel ( 25 ), connected in a manner fixed against relative rotation to the first input shaft ( 12 ), a second sun wheel ( 26 ) connected in a manner fixed against relative rotation to the output shaft ( 13 ), a satellite carrier ( 21 ) that is drivable by the second input shaft ( 14 ), and at least one one-piece stepped planet ( 22 ; 22 ′) retained rotatably on the satellite carrier ( 21 ), with two planet wheels ( 23 , 24 ) spaced apart axially from one another and disposed one at each end portion of a smaller-diameter shaft portion ( 221 ), with one planet wheel meshing with the first and the other planet wheel meshing with the second sun wheel ( 25 , 26 ), and a self-locking worm gear ( 17 ) disposed between the second input shaft ( 14 ) and the satellite carrier ( 21 ), the worm gear having a worm ( 18 ) connected to the second input shaft ( 14 ) in a manner fixed against relative rotation, and a worm wheel ( 20 ) connected to the satellite carrier ( 21 ) in a manner fixed against relative rotation, the worm wheel ( 20 ) being placed on the satellite carrier ( 21 ) being the region of the shaft portion ( 221 ) of the stepped planets ( 22 ; 22 ′), and the satellite carrier ( 21 ) being embodied hollow-cylindrically.