Robot cleaner

A robot cleaner, comprising:

• a wheel, comprising:
• an outer ring contactable with a surface to be cleaned by the robot cleaner,
• an inner ring disposed inside the outer ring and configured to receive a driving force,
• a plurality of spokes connecting the outer ring with the inner ring,
• a plurality of through holes through which air passes, provided between the plurality of spokes, respectively, and
• a plurality of ribs disposed in a portion of the plurality of through holes, respectively, and configured to limit movement of the outer ring when the outer ring is moved toward the inner ring.

A robot cleaner, comprising:

• a main body;
• a cleaning device disposed in the main body and configured to suck material from a surface to be cleaned;
• at least one drive device disposed in the main body and configured to allow movement of the robot cleaner;
• and
• at least one wheel rotated by the at least one drive device, the at least one wheel comprising:
• an outer ring,
• an inner ring disposed concentrically inside the outer ring and configured to receive a driving force from the at least one drive unit,
• a plurality of spokes connecting the outer ring with the inner ring,
• a plurality of through holes through which air passes, provided between adjacent spokes among the plurality of spokes, respectively, and
• a plurality of ribs protruding from one of the inner ring and the outer ring into the plurality of through holes, respectively, and toward the other one of the inner ring and the outer ring, the plurality of ribs being spaced apart from the other one of the inner ring and the outer ring such that the plurality of through holes are substantially u-shaped,
• wherein when the outer ring is moved toward the inner ring, the plurality of ribs are configured to limit movement of the outer ring.