Spindle motor and hard disk drive including the same

Abstract

There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a shaft; a sleeve rotatably supporting the shaft by fluid dynamic pressure; a stator core installed on an outer surface of the sleeve; a base member fixed to the sleeve, wherein at least a portion of an inner edge of the base member in a radial direction is inserted into a fixing portion formed in a circumferential direction in an outer surface of the sleeve in the radial direction, and the sleeve includes a first sleeve supporting the shaft and a second sleeve provided outwardly of the sleeve and having the stator core installed on an outer surface thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2013-0067152 filed on Jun. 12, 2013, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a spindle motor and a hard disk drive including the same.[0004]2. Description of the Related Art[0005]A hard disk drive (HDD), an information storage device, reads data stored on a disk or writes data to a disk using a read / write head.[0006]A hard disk drive requires a disk driving device capable of driving the disk. In such a disk driving device, a small-sized spindle motor is commonly used.[0007]Such a small-sized spindle motor frequently uses a hydrodynamic bearing assembly. A shaft, a rotating member of the hydrodynamic bearing assembly, and a sleeve, a fixed member thereof, have a lubricating fluid interposed therebetween, such ...

AI Technical Summary

Benefits of technology

The present invention provides a spindle motor that can easily and stably seat a core on a base made of plastic working such as press working. Additionally, the invention provides a spindle motor where the base and a sleeve can be easily coupled together. The sleeve has a cover member closing a shaft hole to prevent lubricating fluid leakage, and the base member's lower surface is positioned lower than the lower surfaces of the sleeve and the cover member.

Problems solved by technology

However, in the die-casting scheme according to the related art, since a process of injecting aluminum (Al) in a molten state to make a form is performed, high degrees of temperature and pressure are required, such that a large amount of energy is required in the process and a process time and manufacturing costs increase.

However, in the case of manufacturing the base by press working, since the base basically has a unique thickness, a problem may be generated in coupling a core to the base.

However, in the case in which the base is manufactured by pressing a plate having a unique thickness, since the base has the unique thickness, it may be difficult to form a core seating part on the base.

However, in the case in which the base is manufactured by pressing a plate having a uniform thickness, it may be difficult to couple the base and the sleeve to each other.

Images