US 12,103,604 B2
Steer-by-wire steering gear having a hollow shaft motor and a ball screw drive
Wolfram Raither, Sevelen (CH); and Philippe Steck, Gamprin-Bendern (LI)
Assigned to thyssenkrupp Presta AG, Eschen (LI); and thyssenkrupp AG, Essen (DE)
Appl. No. 17/268,098
Filed by thyssenkrupp Presta AG, Eschen (LI); and thyssenkrupp AG, Essen (DE)
PCT Filed Aug. 20, 2019, PCT No. PCT/EP2019/072285
§ 371(c)(1), (2) Date Feb. 12, 2021,
PCT Pub. No. WO2020/038952, PCT Pub. Date Feb. 27, 2020.
Claims priority of application No. 10 2018 120 266.0 (DE), filed on Aug. 21, 2018.
Prior Publication US 2022/0111885 A1, Apr. 14, 2022
Int. Cl. B62D 5/04 (2006.01); B62D 5/00 (2006.01); B62D 6/00 (2006.01); F16H 25/20 (2006.01); F16H 25/22 (2006.01)
CPC B62D 5/006 (2013.01) [B62D 5/0427 (2013.01); B62D 5/0445 (2013.01); B62D 5/0454 (2013.01); B62D 5/046 (2013.01); B62D 6/008 (2013.01); F16H 25/2204 (2013.01); F16H 2025/2078 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A steer-by-wire steering system for a motor vehicle, the steer-by-wire steering system comprising:
a steering gear comprising:
a hollow shaft motor that includes
a stator that is fixed to a housing, and
a rotatably supported rotor that is arranged coaxially with respect to a longitudinal axis; and
a worm gear extending through the rotatably supported rotor, wherein the worm gear comprises a spindle nut that is disposed coaxially relative to the longitudinal axis, that is connected in terms of driving to the rotatably supported rotor, and that is located on a spindle that is displaceable by way of the hollow shaft motor along the longitudinal axis, wherein an angle of inclination of the worm gear is less than 4.5°, the steering gear configured to act on steered wheels;
a control unit;
a feedback actuator configured to be acted upon by a driver according to a driver-desired steering angle via steering input means, wherein the feedback actuator is configured to transmit a feedback signal to the steering input means in response to the driver-desired steering angle and a travel state of the motor vehicle; and
a signal transmission device configured to transmit the driver-desired steering angle to the control unit,
wherein the control unit is configured to control the steering gear to transform the driver-desired steering angle into a redirection of the steered wheels.