Steering system for motor vehicle and motor vehicle comprising the same

A steering system for a motor vehicle, said steering system comprising:

• a steering wheel rotatable about a first rotational axis;
• a sensory system adapted to detect a physical quantity associated with the angular position of said steering wheel about said first rotational axis;
• at least one actuator device adapted to rotate one or more wheels of said motor vehicle about respective steering axes;
• an electronic control unit operatively connected to said sensory system and said at least one actuator device, said electronic control unit being configured to command, in use, said at least one actuator device to rotate said wheels about the respective said steering axes on the basis of an informative datum associated with said physical quantity and received, in use, by said sensory system;
• a frame operatively connected to a portion of said motor vehicle, wherein said frame is rotatable with respect to said portion about a second rotational axis, which is transversal to said first rotational axis;
• a body supported by said frame and slidable with respect thereto parallel to said first rotational axis;
• and
• a steering shaft to which said steering wheel is fixed and which is supported by said body, wherein said body comprises a tubular cavity arranged coaxially to said first rotational axis and said steering shaft engages said tubular cavity,
• said steering shaft being integral with said body along said first rotational axis when a component of a force acting, in use, on said steering wheel parallel to said first rotational axis is less than a threshold value, said steering shaft being slidable with respect to said body along said first rotational axis when the component of said force acting, in use, on said steering wheel parallel to said first rotational axis is greater than said threshold value.