Spindle motor with labyrinth sealed bearing

Claim 1

A spindle motor with a labyrinth sealed bearing comprising: a stationary member; a hub for rotation relative to the stationary member; ball bearings mounted between the stationary member and the hub; a labyrinth sealing means provided axially outside of the ball bearings for preventing the escape of grease from the ball bearings; said labyrinth sealing means comprising a first member mounted to the stationary member, a second member mounted to the hub, and a third member mounted to the stationary member and having a shape identical to that of the first member; and said first and third members, each having an annular portion thereof fixedly mounted to the stationary member and an annular projection thereof extending radially outwardly from the annular portion, and said second member having an annular portion thereof fixedly mounted to the hub and an annular projection thereof extending radially inwardly from the annular portion, the three projections of the first, second, and third members being axially aligned towards the outside of the motor, the annular portion of the third member abutting at one end a corresponding end of the annular portion of the first member.