Steering and suspension device of vehicle body

1. A steering and suspension device of a vehicle, comprising:

a steering motor fixed to a support which is fixed to and disposed in a vehicle body at a rear side of the vehicle, the steering motor being configured to provide a driving force for steering;

a worm gear connected to the steering motor, and configured to be rotated by the driving force of the steering motor;

a steering device connection assembly having a first end connected to the worm gear, and configured to be turned in a transverse direction of the vehicle when the worm gear rotates;

a suspension connected to a second end of the steering device connection assembly, and the suspension configured to provide damping and shock absorption to the vehicle body; and

a wheel connected to the suspension and configured to rotate while being supported on a ground surface to allow the vehicle to move;

wherein the suspension includes:

a triple tree having a first end connected to a second end of the steering device connection assembly;

a fixation fork having a first end connected to a second end of the triple tree;

a movable fork having a first end connected to cover an outer peripheral portion of the fixation fork, the movable fork being configured to move along an axis of the fixation fork; and

a wheel fastening shaft connected to a central axis of the wheel at a second end of the movable fork, and serving as a rotary shaft of the wheel.

2. The steering and suspension device of claim 1 , wherein

the worm gear comprises:

a worm connected to a rotary shaft of the steering motor, and configured to be rotated jointly with the rotary shaft of the steering motor; and

a worm wheel engaged with the worm, and configured to be rotated by rotation of the worm.

3. The steering and suspension device of claim 2 , wherein:

the worm is formed as a shaft, and a thread is formed on an outer peripheral surface of the worm;

the worm wheel is formed as a circular plate, and a sawtooth is formed at an end of the worm wheel; and

the driving force of the steering motor is converted into a rotational force of the worm wheel by engagement of the thread and the sawtooth.

4. The steering and suspension device of claim 3 , wherein:

the sawtooth is formed only at one portion of the end of the worm wheel; and

a radius of the worm wheel is set according to a forming portion of the sawtooth.

5. The steering and suspension device of claim 3 , wherein a first end of the steering device connection assembly is connected to a center of the worm wheel, and is configured to be rotated in synchronization with the rotation of the worm wheel.

6. The steering and suspension device of claim 5 , wherein the worm wheel is connected to the first end of the steering device connection assembly and is disposed in a direction vertical to a longitudinal direction of the steering device connection assembly.

7. The steering and suspension device of claim 1 , wherein the movable fork reciprocates by a hydraulic pressure.

8. The steering and suspension device of claim 1 , wherein the steering motor is connected to a steering controller (ECU) of an autonomous driving (AD) system by a sensor, and the steering motor is configured to generate a rotational force required for a steering angle and a steering direction upon a determination of the ECU using external vehicle information sensed by the sensor.

9. The steering and suspension device of claim 8 , wherein the sensor includes a radar sensor.

10. The steering and suspension device of claim 1 , wherein the vehicle is a purpose built vehicle (PBV) comprising a driving module and a space module coupled to a rear end of the driving module.

11. The steering and suspension device of claim 1 , wherein one steering and suspension device of the vehicle is provided at a center portion of the vehicle body at the rear side of the vehicle.