| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle motor in which: a stopper is coupled to an inner side of a protrusion part protruded downwardly of a hub in an axial direction to thereby improve coupling force of the hub, operational performance and reliability of the spindle motor; and a coupling structure of a coupling surface is changed in order to increase coupling force between the protrusion part of the hub and the stopper to thereby improve accuracy and reliability in coupling of the spindle motor.SOLUTION: A spindle motor comprises: a shaft 11 becoming the rotational center of a motor rotor 10; a sleeve 22 receiving the shaft 11 therein and rotatably supporting the shaft 11; a hub 12 having the shaft 11 coupled integrally therewith at a central portion thereof, coupled to the shaft 11 at an upper portion of the shaft 11 in an axial direction so as to correspond to one end surface of the sleeve 22, and having a protrusion part 12a protruded downwardly in the axial direction; and a stopper 60 inserted into an inner side of the protrusion part 12a in order to fix and support the hub 12 at a lower portion of the hub in the axial direction. The stopper 60 includes a screw thread 60a protruded outwardly on an outer peripheral surface thereof. A screw coupling groove 12b coupled with the screw thread 60a is formed in an inner side surface of the protrusion part 12a corresponding to the screw thread 60a. |
