Patent ID: 8448202

Claim:
A motor comprising: a rotor case having a chucking device, on which a disk is mounted, press-fitted and coupled thereto; and disk support members mounted on an upper surface of the rotor case to support a bottom surface of the disk, and having each of flow path portions therebetween allowing for airflow in a space between the disk and the rotor case, a push portion being disposed in the rotor case to accelerate the airflow through the flow path portions when the rotor case rotates, the push portion comprising a plurality of recesses spaced part from each other in the upper surface of the rotor case in a circumferential direction thereof, the push portion being disposed inwardly of the flow path portion in the radial direction so as to form an annular ring shape, and the push portion being formed to be depressed downwardly from the upper surface of the rotor case in an axial direction.