Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Fig. 1 shows a partial section of a disk file hub and spindle assembly including a frustoconically shaped diffuser 3 that diminishes acoustic noise in an apparatus having cooling air pumped by the recording disks 4 and hub assembly 5. An acoustical noise problem may occur as a pure tone caused by the air shearing action of the rotating spindle ribs 6 passing over stationary base casting ribs 7 at the location where air enters the spindle cavity through a single hole 8 in the base casting 9. The relatively large mass of air, entering per unit of time at the single hole location, being sheared by the rib 6 interaction gives rise to a possible high energy, high acoustical noise problem. The diffuser 3, mounted between base casting 9 and spindle hub assembly 5, is designed to distribute the air through many small holes 10.