| 摘要 |
In order to provide a compact structure for a vehicle steering system comprising a transmission ratio device and an electric auxiliary drive, said device contains an auxiliary drive comprising a stator ( 6 ) and a rotor which overlaps the control gearing of the driver via a control wheel ( 20 ) and transfers it to the steering movement of the wheels and a housing ( 31 ), a drive unit ( 3 ) which can be driven by the control wheel ( 20 ) and a drive element ( 32 ) which is connected to the steered wheels, in addition to at least two planetary gear systems. The reaction force on the steering wheel should not be increased or should not be noticeably increased. The system should also have the required redundancy in case of an error function of the electric unit. One of the planetary gear systems can be driven by the rotor of an electric motor and the drive torque coming from the control wheel ( 20 ) is superimposed by the drive torque of the electric motor and they are introduced together into the drive element ( 32 ) as drive torque. The ratio of the rotational speed of the drive unit ( 3 ) and the drive element ( 32 ) can be adjusted.
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