Fan motor

A fan motor comprising:

• a rotating shaft that extends in an axial direction;
• an impeller coupled to the rotating shaft;
• a motor configured to drive the rotating shaft, the motor comprising (i) a rotor connected to the rotating shaft and (ii) a stator surrounding the rotor;
• a plurality of bearings that support the rotating shaft, each of the plurality of bearings comprising:
• an inner ring coupled to the rotating shaft,
• an outer ring spaced apart from the inner ring and disposed radially outward from the inner ring, and
• a plurality of balls disposed between the outer ring and the inner ring;
• a spring having a first axial side surface in contact with an axial side surface of the outer ring of one of the plurality of bearings;
• and
• a cylinder having (i) a first axial side in contact with a second axial side surface of the spring and (ii) a second axial side in contact with an axial side surface of the outer ring of another of the plurality of bearings,
• wherein the cylinder surrounds the rotating shaft,
• wherein the cylinder comprises a spring mounting part that supports the spring on the first axial side of the cylinder,
• wherein the spring mounting part protrudes radially inward from the first axial side of the cylinder toward the rotating shaft,
• wherein the cylinder further comprises a fixing protrusion that protrudes from an inner end portion of the spring mounting part toward the one of the plurality of bearings, and
• wherein the second axial side surface of the spring surrounds the fixing protrusion and is fitted to the fixing protrusion.