Spindle motor and hard disk drive including the same

摘要

There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a sleeve supporting a shaft so that an upper end of the shaft protrudes upwardly in an axial direction and a bearing clearance filled with a lubricating fluid formed between the sleeve and the shaft; a housing provided so as to enclose an outer peripheral surface of the sleeve and forming a circulation hole between the housing and the sleeve in the axial direction; and a rotor hub fixedly installed on an upper end portion of the shaft in the axial direction, wherein a connection part is formed between the housing and the rotor hub so as to allow a sealing part on which a liquid-vapor interface is disposed and the circulation hole to be in communication with each other.

主权项

1. A spindle motor comprising:
a sleeve supporting a shaft so that an upper end of the shaft protrudes upwardly in an axial direction and a bearing clearance filled with a lubricating fluid formed between the sleeve and the shaft; a housing provided so as to enclose an outer peripheral surface of the sleeve and forming a circulation hole between the housing and the sleeve in the axial direction; a rotor hub fixedly installed on an upper end portion of the shaft in the axial direction and comprising an extension wall part protruding downwardly from the rotor hub in the axial direction and facing the sleeve and the housing in a radial direction; a sealing part on which a liquid-vapor interface is disposed is formed between the housing and the extension wall part in a radial direction; and a connection part is formed in the radial direction, the connection part connecting the sealing part and the circulation hole to be in communication with each other and an outer end of the connection part in the radial direction being connected to the sealing part.