Spindle motor

Abstract

There is provided a spindle motor including: a shaft; a first sleeve rotatably supporting the shaft by fluid dynamic pressure; a second sleeve provided outwardly of the first sleeve; a stator core mounted on an outer surface of the second sleeve; and a base member including a mounting part protruding upwardly in an axial direction and fixed to at least one of the first and second sleeves.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Applications No. 10-2012-0032342 filed on Mar. 29, 2012 and No. 10-2012-0062637 filed on Jun. 12, 2012, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by references.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a spindle motor.[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]The hard disk drive requires a disk driving device capable of driving a disk. In the disk driving device, a small spindle motor is used.[0007]This small-sized spindle motor has used 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 that the shaft is...

AI Technical Summary

Benefits of technology

The patent text describes a spindle motor that can be easily and stably seated on a base made through plastic working, such as pressing. Its technical effect is to provide a reliable and efficient way to attach a spindle motor to a base, which can help improve manufacturing efficiency and accuracy.

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 into a mold to make a form is performed, large amounts of temperature and pressure are required, such that a large amount of energy may be required in the process and processing time and costs may be increased.

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

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

Images