Abstract

Disclosed is a subassembly of a disk drive device for reducing the slope of a surface on which a recording disk is placed. The subassembly (100) is provided with a base plate (10), a hub (12) upon which a recording disk (200) is to be placed, a shaft (16) coupled to an aperture portion (12d) of the center of the hub (12), and a bearing unit for supporting the shaft (16) so as to be rotatable relative to the base plate (10). The hub (12) comprises a barrel for holding the recording disk (200) and an outer extending portion (46) arranged consecutively thereto, and a seating surface (12b) formed upon the outer extending portion (46). In addition, the aperture portion (12d) has been configured to maintain a pressure-contact state with the shaft (16) at the temperature of processing when applying aging processing to at least the coupled portions of the hub (12) and the shaft (16) so that the slope value of the disk seating surface defined in a coupled state of the aperture portion (12d) with the shaft (16) falls to or below a pre-defined maximum tolerance with respect to a surface perpendicular to the axial direction.

IPC Classes  ?

• G11B 17/028 - Positioning or locking of single discs of discs rotating during transducing operation
• G11B 17/038 - Centering or locking of a plurality of discs in a single cartridge

Abstract

A method of manufacturing a rotary device includes a step of plastic forming of a thrust dynamic pressure pattern (26h) wherein deformation of or difference in the height of the top surfaces of the thrust dynamic pressure pattern (26h) is reduced by pressing a work (26) intended to be the pressure pattern by means of a die (503) and releasing the pressure in multiple processes repeated several times. The rotary device thus produced has a narrower bearing gap and a high efficiency of collecting lubricant to increase a thrust dynamic pressure.

IPC Classes  ?

• B21D 22/02 - Stamping using rigid devices or tools
• B21D 53/10 - Making other particular articles parts of bearingsMaking other particular articles sleevesMaking other particular articles valve seats or the like
• B21J 5/02 - Die forgingTrimming by making use of special dies
• H02K 5/167 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings

Abstract

Disclosed is a disk drive apparatus provided with a hub configured such that a recording disk can be mounted thereupon, and wherein, when a non-rotation natural frequency of a secondary locking mode resonance when the recording disk is mounted on the hub is assumed to be F0 (Hz), and the rotational speed to be used by the hub is assumed to be N (Hz), the diameter direction dimension of an externally elongating section of the hub is formed to be smaller than the axial direction dimension of a second external cylinder section so that the natural frequency F0 satisfies F0 > N•(3•P + 2).

IPC Classes  ?

• H02K 21/22 - Synchronous motors having permanent magnetsSynchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
• G11B 19/20 - DrivingStartingStoppingControl thereof
• H02K 5/04 - Casings or enclosures characterised by the shape, form or construction thereof