Steer-by-wire rotary actuator

A steer-by-wire steering system for steering a set of road wheels, the system comprising:

• a first controller;
• at least one actuator assembly connected to the controller and to at least one wheel of the set of road wheels;
• an hydraulic backup assembly connected to the at least one actuator assembly, wherein the at least one actuator assembly further comprises a plurality of actuator assemblies connected to the first controller and to at least one wheel of the set of road wheels;
• and
• a cross link system, comprising:
• a first segment thereof connected to a first actuator assembly of the plurality of actuator assemblies;
• and
• a second segment thereof connected to a second actuator assembly of the plurality of actuator assemblies.

A steer-by-wire steering system comprising:

• a first controller;
• a plurality of actuator assemblies independently mounted to a vehicle and connected to a road wheel, said actuator assemblies being in operable communication with said controller, wherein at least one of the plurality of actuator assemblies comprises:
• an electro mechanical actuator;
• a crank arm connected to the electro mechanical actuator;
• a tie rod connected to the crank arm;
• and
• a steering arm connected to the tie rod and to the road wheel;
• and
• a back-up assembly connected to at least one actuator assembly of the plurality of actuator assemblies, wherein the back-up assembly further comprises:
• a cylinder connected to the crank arm via a linking bar;
• a valve connected to the cylinder;
• a pump connected to the valve;
• and
• a second controller connected to the valve.

A steer-by-wire steering system for steering a set of steerable members, comprising:

• a first controller;
• a first electro mechanical actuator connected to said first controller, said first electro mechanical actuator being configured to rotate a first crank arm in response to first signals from said first controller, said first crank arm being adapted to adjust a position of a first member of the set of steerable members;
• a second electro mechanical actuator connected to said first controller, said second electro-mechanical actuator being configured to rotate a second crank arm in response to second signals from said first controller, said second crank arm being adapted to adjust a position of a second member of the set of steerable members;
• a first back-up assembly securing said first and second crank arms to one another, said first back-up assembly being operative to transfer steering responsibility from said first electro-mechanical actuator to said second electro mechanical actuator or vice-versa in the event that either of said first and second electro mechanical actuators become inoperative;
• a second controller;
• and
• a second back-up assembly secured to said first crank arm, said second back-up assembly being configured to assume steering responsibility from said first and second electro mechanical actuators in response to third signals from said second controller in the event that said first controller or both of said first and second electro mechanical actuators become inoperative.