Wheel cover with moveable vent structure

A wheel cover with the moveable vent structure, the wheel cover comprising:

• a fixing unit fixed to a wheel of a vehicle together with a braking device;
• a variable unit coupled to the fixing unit to open or close an external side surface of the wheel;
• a first power unit including a thermally responsive elastic member to generate a first force to the variable unit;
• and
• a second power unit including an elastic member to generate a second force to the variable unit,
• wherein the thermally responsive elastic member non-linearly generates a first elastic force in a predetermined temperature range, and the elastic member generates a second elastic force linearly with respect to a change in length.