WHEEL ASSEMBLY OF MOBILE ROBOT

The present invention relates to a mobile robot, in which a wheel is mounted on a robot body in an elevatable structure. The invention comprises: a gear box, in which a driving gear that is driven by a driving motor and a driven gear that is driven by said driving gear are accommodated, which is rotatably installed in front and rear directions of a robot body at a rotary shaft positioned on one side thereof, and has a first fixing unit; a wheel which is combined to a rotary shaft of said driven gear, integrally rotates with said driven gear, and rises or falls with respect to the robot body during rotation of said gear box; and a pulling member which is fixed to a second fixing unit, which has one end fixed to said first fixing unit and the other end having a fixed position on said robot body, and rotates said gear box in the downward direction of said wheel from said robot body by pulling said first fixing unit toward said second fixing unit.