| 摘要 |
The present invention comprises a shaft; a sleeve formed in a hollow cylindrical shape to rotate, with oil as a medium, while maintaining a gap with the shaft; a rotor including a cylindrical part providing a space for accommodating the sleeve, a hub expanded in an external direction from the cylindrical part, a skirt part extended vertically in a downward direction at the edge of the hub, and a cylindrical fluid dynamic bearing part protruding from the cylindrical part toward the center; a base including a cylindrical support part at the center and one or more receiving grooves on the inner side surface of the support part; and a cylindrical lower cover including one or more protrusions on the outer circumferential surface thereof to receive a lower side part of the shaft and be disposed inside the support part of the base, wherein the protrusion of the lower cover is inserted into and coupled to the receiving groove of the base. |
