Patent ID: 8126612

Claim:
A steering system comprising: a steering wheel adapted to receive a driver's rotational input; left and right wheel units adapted to rollingly interface a vehicle to a ground for driving movement of the vehicle, each wheel unit being rotatable along a steering angle for adjusting a direction of the vehicle during the driving movement; a steering mechanism for converting the rotational input to a variation of the steering angle of the wheel units, the steering mechanism comprising: a steering shaft connected to the steering wheel, gear steering units for each said wheel unit, the gear steering units connected to the steering shaft and each comprising a planetary gear system for receiving the rotational input from the steering shaft and for mechanically converting the rotational input to steering outputs for both said wheel units to concurrently vary the steering angle of said wheel units, and independent steering units for each said wheel unit, the independent steering units each adjusting the steering angle of a respective one of the wheel units independently from the rotational input and from the other wheel unit by directly actuating a rotation of a ring of the planetary gear system.