Rotary compressor

A rotary compressor, comprising:

• a rotational shaft including at least one protrusion formed on an outer peripheral surface of the rotational shaft;
• a first bearing and a second bearing configured to support the rotational shaft in a radial direction;
• a cylinder disposed between the first bearing and the second bearing to form a compression space;
• a rotor disposed in the compression space and coupled to the rotational shaft to compress a refrigerant as the rotor rotates;
• and
• at least one vane slidably inserted into the rotor, the at least one vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions, wherein the rotor comprises at least one groove which is formed on an inner peripheral surface of the rotor and faces the at least one protrusion, and wherein an outer peripheral surface of the at least one protrusion of the rotational shaft is spaced apart from an inner peripheral surface of the at least one groove of the rotor by a plurality of predetermined distances such that the rotational shaft is axially movable relative to the rotor while the coupling between the at least one groove of the rotor and the at least one protrusion of the rotational shaft is maintained.