US 11,987,296 B2
Steering device
Shingo Ishige, Haga-gun (JP); and Yusuke Anma, Haga-gun (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Filed by SHOWA CORPORATION, Gyoda (JP)
Filed on Oct. 5, 2020, as Appl. No. 17/063,344.
Application 17/063,344 is a continuation in part of application No. PCT/JP2018/019492, filed on May 21, 2018.
Prior Publication US 2021/0016824 A1, Jan. 21, 2021
Int. Cl. B62D 5/04 (2006.01); H02P 25/22 (2006.01); H02P 29/028 (2016.01)
CPC B62D 5/0463 (2013.01) [B62D 5/0481 (2013.01); H02P 25/22 (2013.01); H02P 29/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A steering device comprising:
one or more electric motors configured to be driven to turn wheels of a vehicle; and
three or more drive systems each configured to output a driving force for driving a corresponding one of the electric motors to the corresponding one of the electric motors, wherein
a total of maximum driving forces each of which is a maximum value of a driving force of each drive system of the steering device is set larger than a required driving force, said required driving force being a force that is required to turn the wheels to a predetermined maximum turning angle with the vehicle stationary, and
in an event of a failure occurring in one of the three or more drive systems, a total of the maximum driving forces of other properly working drive systems out of the three or more drive systems amounts to the required driving force.