Wheel driving assembly of a moving apparatus

A wheel driving apparatus of a moving apparatus, comprising:

• a wheel;
• a driving motor to generate a driving power to rotate the wheel;
• a gear box to transmit the driving power of the driving motor to the wheel;
• and
• a guide shaft movable vertically with respect to a base member,
• wherein the wheel, the driving motor, the gear box, and the guide shaft are connected integrally with each other to move vertically with respect to the base member in unison, and
• wherein the guide shaft has a first end that is supported by the base member and a second end of the guide shaft that is supported on a wheel cover connected to the base member.