Browse Prior Art Database

Airflow System for Disk Drive

IP.com Disclosure Number: IPCOM000061553D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 107K

Publishing Venue

IBM

Related People

Beck, JL: AUTHOR [+4]

Abstract

An actuator bypass internal recirculating airflow system in a disk drive enables reliably purging contamination therefrom. Although a major source of particle generation within the file or disk drive is the actuator assembly, it is only necessary for air to flow past the actuator rather than through it to provide satisfactory performance. Because of this characteristic, the actuator assembly can be a completely sealed enclosure. This allows the actuator magnets to be merged to the file outside the clean room during manufacture, thereby providing the opportunity for a cleaner disk enclosure assembly. The airflow system in the disk drive includes a disk hub assembly 20 (Fig. 1) which has a hub cap 25 with multiple fan blades. This allows hub assembly 20 to function as a centrifugal air pump.

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Airflow System for Disk Drive

An actuator bypass internal recirculating airflow system in a disk drive enables reliably purging contamination therefrom. Although a major source of particle generation within the file or disk drive is the actuator assembly, it is only necessary for air to flow past the actuator rather than through it to provide satisfactory performance. Because of this characteristic, the actuator assembly can be a completely sealed enclosure. This allows the actuator magnets to be merged to the file outside the clean room during manufacture, thereby providing the opportunity for a cleaner disk enclosure assembly. The airflow system in the disk drive includes a disk hub assembly 20 (Fig. 1) which has a hub cap 25 with multiple fan blades. This allows hub assembly 20 to function as a centrifugal air pump. Air enters the hub 20 near its axis of rotation and is immediately accelerated by the hub cap fan blades 25. The air passes through slots 35 in the bell clamp 30 and is distributed to all disk surfaces 15 through notches 36 in the top of the bell clamp 30, disk spacers 40, and lower disk clamping surface on the hub. The air travels in an inside diameter (ID) to outside diameter (OD) direction. Contaminants remaining from file manufacture or particles generated during file usage, for example, those resulting from head-to-disk contact during start/stop, are carried away from the head/disk interface by the airflow. Because the airflow distribution across the disk pack is not completely uniform, weaker at the outside surfaces, baffle 50 (Fig. 3) is placed at the actuator cavity entrance to help create a particle block via a pressure increase. Baffle 50 improves the particle count in the head/disk area by an approximate factor of 3 when the actuator is generating particles. A corresponding similar baffle (not shown) is pla...