Patent ID: 9472234
Filing Date: 2016-10-18
CPC Classification: F16C,G11B,Y10T

Claim Text:
1. A hard disk drive comprising: a spindle motor having a fluid dynamic bearing (FDB) motor hub and a stator; a ring-shaped magnet; a hard disk drive housing for housing the spindle motor and the ring-shaped magnet, the hard disk drive housing having an upper housing and a base, the base comprising a first material; and a base insert having ferromagnetic properties, the base insert comprising a second material and having a flat circular bottom portion with a hole and an outer circumferential vertical portion, and wherein the flat circular bottom portion of the base insert is located between the stator of the spindle motor and the base to enhance yield strength therebetween, the stator is located above the flat circular bottom portion of the base insert between the flat circular bottom portion and the magnet in a vertical direction, and a bottom portion of the spindle motor is surrounded by the outer circumferential vertical portion of the base insert to generate preload for the FDB motor hub.