Fan and manufacturing method therefor

A fan comprising:

• a fan housing having a cylindrical inner circumferential portion;
• a base connected to the rear surface of the fan housing through a plurality of bridges and having a bearing housing protruding and integrally formed at a central portion thereof;
• a sleeve bearing inserted into the bearing housing;
• a rotary shaft of which a lower portion is rotatably supported by the sleeve bearing;
• a rotor fixed to an upper portion of the rotary shaft;
• a stator which is fixed on the base, has an inner circumferential portion coupled to an outer circumference of the bearing housing, and is arranged with a predetermined gap from the rotor;
• an impeller which is integrally formed on an outer circumference of the rotor and rotates together,
• a plurality of connection protrusions protruding from an upper portion of the bearing housing;
• and
• a plurality of through-holes penetratively formed in an oil-scattering prevention portion and coupled with the plurality of connection protrusions, respectively, when the stator is assembled to the outer circumference of the bearing housing, wherein front end portions exposed through the plurality of through-holes are fixed to an upper portion of the oil-scattering prevention portion by thermal fusion,
• wherein the stator comprises:
• a stator core in which an inner circumferential portion of a back yoke is fixed to an outer circumferential surface of the bearing housing and a plurality of teeth on which a coil is wound are extended;
• a bobbin surrounding the teeth and the back yoke of the stator core and having the oil-scattering prevention portion located on an upper surface thereof extending to the inside of the bearing housing;
• and
• the coil wound around the coil winding region of the bobbin and to which a motor driving signal is applied.