Spindle motor

摘要

There is provided a spindle motor including: a sleeve supporting a shaft; and a rotor hub coupled to an upper portion of the shaft to thereby form a bearing clearance with the sleeve, wherein the sleeve and the rotor hub are provided with a plurality of sealing parts for preventing a leakage of a lubricating fluid.

主权项

1. A spindle motor comprising:
a sleeve supporting a shaft; and a rotor hub coupled to an upper portion of the shaft to thereby form a bearing clearance with the sleeve, the rotor hub including an extension wall part extended downwardly in the axial direction from a lower surface thereof, wherein the sleeve includes a protrusion part protruding in the outer diameter direction so as to be disposed under the extension wall part, and the sleeve and the rotor hub are provided with a plurality of sequentially disposed sealing parts for preventing a leakage of a lubricating fluid, the plurality of sealing parts including
a first sealing part formed by an outer peripheral surface of the sleeve disposed above the protrusion part and an inner surface of the extension wall part, anda second sealing part formed by a lower surface of the extension wall part and an upper surface of the protrusion part.