Steering system for a motor vehicle
A steering system ( 10 ) for a motor vehicle, which steering system ( 10 ) is configured as a steer-by-wire steering system, comprises a rack ( 14 ), an electric drive ( 16 ) for the longitudinal displacement of the rack ( 14 ), and a rotatably mounted supporting element ( 20 ) which is spaced apart from the electric drive ( 16 ) along the longitudinal axis of the rack ( 14 ), and the rotatably mounted supporting element ( 20 ) being in toothed engagement with the rack ( 14 ).
1. A steering system ( 10 ) for a motor vehicle, which steering system ( 10 ) is configured as a steer-by-wire steering system, the steering system ( 10 ) comprising a rack ( 14 ), an electric drive ( 16 ) for the longitudinal displacement of the rack ( 14 ), and a rotatably mounted supporting element ( 20 ) which is spaced apart from the electric drive ( 16 ) along the longitudinal axis of the rack ( 14 ), and the rotatably mounted supporting element ( 20 ) being in toothed engagement with the rack ( 14 ) and rotating only in response to the longitudinal displacement of the rack ( 14 ).
2. The steering system ( 10 ) as claimed in claim 1 , wherein the supporting element ( 20 ) is inclined relative to an axis which is perpendicular with respect to the displacement direction of the rack ( 14 ).
3. The steering system ( 10 ) as claimed in claim 1 , wherein a sensor ( 34 ) is provided which, together with an evaluation unit ( 36 ), is configured to determine the position of the rack ( 14 ).
4. The steering system ( 10 ) as claimed in claim 3 , wherein the sensor ( 34 ) is connected fixedly to the supporting element ( 20 ), the sensor ( 34 ) being attached via the supporting element ( 20 ) to the rack ( 14 ).
5. The steering system ( 10 ) as claimed in claim 3 , wherein the sensor ( 34 ) is connected in a signal-transmitting manner to a control unit ( 38 ) which actuates the electric drive ( 16 ).
6. The steering system ( 10 ) as claimed in claim 1 , wherein the electric drive ( 16 ) comprises a belt drive ( 18 ).
7. The steering system ( 10 ) as claimed in claim 1 , wherein a recirculating ball mechanism ( 30 ) is provided which interacts with the electric drive ( 16 ), the recirculating ball mechanism ( 30 ) being connected to a belt drive ( 18 ), in particular.
8. The steering system ( 10 ) as claimed in claim 1 , wherein the steering system ( 10 ) comprises a bearing bush ( 46 , 64 ) of separate configuration which supports the rack ( 14 ) on the circumferential side.
9. The steering system ( 10 ) as claimed in claim 1 , wherein the steering system ( 10 ) comprises two bearing bushes ( 46 , 64 ) which are spaced apart from one another in the longitudinal direction of the rack ( 14 ), the bearing bushes ( 46 , 64 ) together forming a rack guide.
10. The steering system ( 10 ) as claimed in claim 1 , wherein the steering system ( 10 ) comprises a pressure piece ( 40 ) which is arranged in the region of the supporting element ( 20 ) and which supports the rack ( 14 ).
11. The steering system ( 10 ) as claimed in claim 1 , wherein the rotatably mounted supporting element ( 20 ) is assigned to a first end ( 22 ) of the rack ( 14 ), the electric drive ( 16 ) being assigned to a second end ( 24 ) of the rack ( 14 ), which second end ( 24 ) lies opposite the first end ( 22 ).
12. The steering system ( 10 ) as claimed in claim 1 , wherein the rotatably mounted supporting element ( 20 ) is free of mechanical connections to a steering wheel ( 12 ).
13. The steering system ( 10 ) as claimed in claim 1 , further comprising a pressure piece ( 40 ) that maintains the toothed engagement between the supporting element ( 20 ) and the rack ( 14 ).
14. The steering system ( 10 ) as claimed in claim 1 , further comprising a bearing bush ( 64 ) that maintains the toothed engagement between the supporting element ( 20 ) and the rack ( 14 ).